{"id":4105,"date":"2026-06-09T16:26:50","date_gmt":"2026-06-09T08:26:50","guid":{"rendered":"https:\/\/ballvalves.tw\/?p=4105"},"modified":"2026-07-25T12:47:46","modified_gmt":"2026-07-25T04:47:46","slug":"%e3%83%9c%e3%83%bc%e3%83%ab%e3%83%90%e3%83%ab%e3%83%96%e3%81%ae%e6%bc%8f%e3%82%8c","status":"publish","type":"post","link":"https:\/\/ballvalves.tw\/ja\/ball-valve-leaking\/","title":{"rendered":"\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u304b\u3089\u6c34\u6f0f\u308c\uff1f\u307e\u305a\u306f\u6f0f\u308c\u7b87\u6240\u3092\u7279\u5b9a\u3057\u307e\u3057\u3087\u3046\uff084\u3064\u306e\u30bf\u30a4\u30d7\u30014\u3064\u306e\u5bfe\u51e6\u6cd5\uff09"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u201c\u300c\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u306e\u6f0f\u308c\u300d\u3068\u3044\u3046\u8a00\u8449\u306f\u3001\u5c11\u306a\u304f\u3068\u30824\u3064\u306e\u7570\u306a\u308b\u554f\u984c\u3092\u6307\u3057\u3066\u304a\u308a\u3001\u305d\u308c\u305e\u308c\u306b\u5bfe\u51e6\u6cd5\u3082\u7570\u306a\u308a\u307e\u3059\u3002\u30d0\u30eb\u30d6\u306e\u69cb\u9020\u3092\u6bd4\u8f03\u3059\u308b\u524d\u306b\u3001\u307e\u305a\u6f0f\u308c\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b9\u30c6\u30e0\uff0f\u68b1\u5305\u30a8\u30ea\u30a2<\/strong> \u2013 \u30b9\u30c6\u30e0\u5468\u8fba\u3001\u30cf\u30f3\u30c9\u30eb\u4e0b\u3001\u307e\u305f\u306f\u30a2\u30af\u30c1\u30e5\u30a8\u30fc\u30bf\u306e\u53d6\u308a\u4ed8\u3051\u90e8\u306e\u5468\u56f2\u304b\u3089\u6db2\u4f53\u304c\u6ef2\u307f\u51fa\u3066\u3044\u308b\u3002.<\/li>\n\n\n\n<li><strong>\u63a5\u7d9a\u3092\u7d42\u4e86\u3059\u308b<\/strong> \u2013 \u30d0\u30eb\u30d6\u3068\u914d\u7ba1\u306e\u63a5\u5408\u90e8\u304b\u3089\u306e\u6f0f\u308c\uff1a\u4e21\u7aef\u306e\u306d\u3058\u8fbc\u307f\u7d99\u624b\u3001\u6eb6\u63a5\u7d99\u624b\u3001\u307e\u305f\u306f\u30d5\u30e9\u30f3\u30b8\u7d99\u624b\u3002.<\/li>\n\n\n\n<li><strong>\u30d0\u30eb\u30d6\u30dc\u30c7\u30a3\u306e\u63a5\u5408\u90e8<\/strong> \u2013 \u30d0\u30eb\u30d6\u672c\u4f53\u306e\u5404\u90e8\u304c\u30dc\u30eb\u30c8\u3084\u30cd\u30b8\u3067\u63a5\u5408\u3055\u308c\u3066\u3044\u308b\u7b87\u6240\u306e\u6f0f\u308c\u3002.<\/li>\n\n\n\n<li><strong>\u9589\u3058\u305f\u30dc\u30fc\u30eb\u3092\u901a\u308b\u5185\u90e8\u6f0f\u308c<\/strong> \u2013 \u30d0\u30eb\u30d6\u306f\u9589\u307e\u3063\u3066\u3044\u308b\u304c\u3001\u4e0b\u6d41\u3078\u306e\u6d41\u308c\u306f\u7d9a\u3044\u3066\u3044\u308b\u3002\u5916\u90e8\u306b\u6c34\u6ef4\u304c\u5782\u308c\u308b\u3053\u3068\u306f\u306a\u304f\u3001\u6f0f\u308c\u306f\u30b7\u30fc\u30c8\u90e8\u5206\u304b\u3089\u751f\u3058\u3066\u3044\u308b\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This article is about the third one. A <strong>welded-body<\/strong> 2-piece ball valve has no bolted body joint, so it reduces one potential external leak path. That is a genuine structural difference. It is also a limited one: it does nothing for the stem, the pipe ends or the sealing of the closed ball. Both halves of that statement matter when you specify valves for an industrial line.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-1024x576.webp\" alt=\"\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u306e\u6f0f\u308c\u30be\u30fc\u30f3\u56f3\uff08\u30b9\u30c6\u30e0\u30b7\u30fc\u30eb\u3001\u30dc\u30fc\u30eb\u3068\u30b7\u30fc\u30c8\u3001\u30dc\u30c7\u30a3\u30b8\u30e7\u30a4\u30f3\u30c8\u3092\u793a\u3059\" class=\"wp-image-4108\" srcset=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-1024x576.webp 1024w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-300x169.webp 300w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-768x432.webp 768w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-1536x864.webp 1536w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-18x10.webp 18w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones-600x338.webp 600w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-leak-zones.webp 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6f0f\u308c\u7b87\u6240<\/th><th>\u3069\u3053\u3067\u898b\u3089\u308c\u308b\u304b<\/th><th>\u4e3b\u306b\u4f55\u306b\u5de6\u53f3\u3055\u308c\u308b\u304b<\/th><\/tr><\/thead><tbody><tr><td>\u30b9\u30c6\u30e0\uff0f\u68b1\u5305\u30a8\u30ea\u30a2<\/td><td>\u830e\u306e\u5468\u308a\u3001\u53d6\u3063\u624b\u306e\u4e0b<\/td><td>\u30b9\u30c6\u30e0\u30b7\u30fc\u30eb\u306e\u69cb\u9020\u3068\u72b6\u614b\u3001\u71b1\u30b5\u30a4\u30af\u30eb\u3001\u30d0\u30eb\u30d6\u306e\u4f5c\u52d5\u983b\u5ea6<\/td><\/tr><tr><td>\u63a5\u7d9a\u3092\u7d42\u4e86\u3059\u308b<\/td><td>\u30d0\u30eb\u30d6\u3068\u914d\u7ba1\u306e\u63a5\u5408\u90e8<\/td><td>\u8a2d\u7f6e\u54c1\u8cea\u3001\u306d\u3058\u7528\u30b7\u30fc\u30eb\u5264\u307e\u305f\u306f\u30ac\u30b9\u30b1\u30c3\u30c8\u3001\u914d\u7ba1\u306e\u5fdc\u529b<\/td><\/tr><tr><td>\u30d0\u30eb\u30d6\u30dc\u30c7\u30a3\u306e\u63a5\u5408\u90e8<\/td><td>\u8eca\u4f53\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u63a5\u5408\u90e8\u3067<\/td><td>\u30dc\u30c7\u30a3\u30b7\u30fc\u30eb\u307e\u305f\u306f\u30ac\u30b9\u30b1\u30c3\u30c8\u3001\u7de0\u7d50\u90e8\u54c1\u3001\u7d44\u7acb\u3001\u4f7f\u7528\u6761\u4ef6\u3001\u4fdd\u5b88<\/td><\/tr><tr><td>\u5185\u90e8\u6f0f\u308c\uff08\u9589\u3058\u305f\u30dc\u30fc\u30eb\u3092\u901a\u904e\u3059\u308b\u6f0f\u308c\uff09<\/td><td>\u30d0\u30eb\u30d6\u304c\u9589\u3058\u305f\u72b6\u614b\u3067\u306e\u4e0b\u6d41\u65b9\u5411\u3078\u306e\u6d41\u308c\u3002\u5916\u90e8\u304b\u3089\u306f\u898b\u3048\u306a\u3044<\/td><td>\u30b7\u30fc\u30c8\u306e\u72b6\u614b\u3001\u7570\u7269\u3001\u30dc\u30fc\u30eb\u8868\u9762\u3001\u7a3c\u50cd\u7387<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f93\u6765\u306e\u30dc\u30c7\u30a3\u30b8\u30e7\u30a4\u30f3\u30c8\u304c\u5916\u90e8\u3078\u306e\u6f0f\u308c\u7d4c\u8def\u3068\u306a\u308a\u5f97\u308b\u7406\u7531<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dc\u30eb\u30c8\u3084\u30cd\u30b8\u3067\u63a5\u5408\u3055\u308c\u305f\u672c\u4f53\u63a5\u5408\u90e8\u306f\u3001\u5bc6\u9589\u3055\u308c\u305f\u6a5f\u68b0\u7684\u63a5\u5408\u90e8\u3067\u3042\u308a\u3001\u672c\u4f53\u30b7\u30fc\u30eb\u3084\u30ac\u30b9\u30b1\u30c3\u30c8\u304c\u3001\u7de0\u7d50\u5177\u3084\u306d\u3058\u5c71\u306b\u3088\u3063\u3066\u8377\u91cd\u4e0b\u3067\u56fa\u5b9a\u3055\u308c\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u63a5\u5408\u90e8\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u304c\u91cd\u306a\u3063\u305f\u5834\u5408\u306b\u306f\u6f0f\u308c\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u308c\u306f\u300c\u901a\u5e38\u306f\u6f0f\u308c\u304c\u751f\u3058\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u3068\u306f\u7570\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f93\u6765\u306e2\u30d4\u30fc\u30b9\u578b\u304a\u3088\u30733\u30d4\u30fc\u30b9\u578b\u306e\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u306f\u3001\u5225\u3005\u306e\u672c\u4f53\u90e8\u54c1\u3092\u7d44\u307f\u7acb\u3066\u3066\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u90e8\u54c1\u304c\u63a5\u5408\u3059\u308b\u90e8\u5206\u306b\u304a\u3051\u308b\u6c17\u5bc6\u6027\u306f\u3001\u63a5\u5408\u90e8\u306e\u8a2d\u8a08\u305d\u306e\u3082\u306e\u3001\u30b7\u30fc\u30eb\u3084\u30ac\u30b9\u30b1\u30c3\u30c8\u306e\u6750\u8cea\u304a\u3088\u3073\u5a92\u4f53\u3068\u306e\u9069\u5408\u6027\u3001\u7d44\u307f\u7acb\u3066\u4f5c\u696d\uff08\u30c8\u30eb\u30af\u3001\u4f4d\u7f6e\u5408\u308f\u305b\u3001\u6e05\u6d44\u5ea6\uff09\u3001\u3055\u3089\u306b\u306f\u4f7f\u7528\u4e2d\u306b\u63a5\u5408\u90e8\u304c\u53d7\u3051\u308b\u3042\u3089\u3086\u308b\u5f71\u97ff\u306a\u3069\u3001\u8907\u6570\u306e\u8981\u56e0\u306b\u540c\u6642\u306b\u5de6\u53f3\u3055\u308c\u307e\u3059\u3002 \u6e29\u5ea6\u30b5\u30a4\u30af\u30eb\u3001\u632f\u52d5\u3001\u5727\u529b\u5909\u52d5\u3001\u305d\u3057\u3066\u4fdd\u5b88\u72b6\u614b\u3082\u3059\u3079\u3066\u5f71\u97ff\u3092\u53ca\u307c\u3057\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dc\u30eb\u30c8\u7de0\u3081\u5f0f\u30d0\u30eb\u30d6\u306e\u591a\u304f\u306f\u3001\u30dc\u30c7\u30a3\u63a5\u5408\u90e8\u306b\u554f\u984c\u304c\u751f\u3058\u308b\u3053\u3068\u306a\u304f\u4f55\u5e74\u3082\u7a3c\u50cd\u3057\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002\u6280\u8853\u7684\u306a\u89b3\u70b9\u304b\u3089\u306f\u3001\u30dc\u30c7\u30a3\u63a5\u5408\u90e8\u306f\u5727\u529b\u5883\u754c\u4e0a\u306e\u3082\u3046\u4e00\u3064\u306e\u30b7\u30fc\u30eb\u754c\u9762\u306b\u904e\u304e\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u9069\u5207\u306b\u8a2d\u8a08\u30fb\u7d44\u307f\u7acb\u3066\u30fb\u4fdd\u5b88\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3001\u70b9\u691c\u6642\u306b\u78ba\u8a8d\u3059\u3079\u304d\u7b87\u6240\u304c\u4e00\u3064\u5897\u3048\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002 \u305d\u308c\u304c\u8cb4\u793e\u306e\u30d7\u30e9\u30f3\u30c8\u306b\u304a\u3044\u3066\u91cd\u8981\u304b\u3069\u3046\u304b\u306f\u3001\u4f7f\u7528\u6761\u4ef6\u3084\u4fdd\u5b88\u6163\u884c\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u672c\u8a18\u4e8b\u306e\u6b8b\u308a\u306e\u90e8\u5206\u306f\u3001\u65ad\u5b9a\u3067\u306f\u306a\u304f\u6bd4\u8f03\u3068\u3044\u3046\u5f62\u3067\u8a18\u8ff0\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Changes with a <strong>Welded-Body<\/strong> 2-Piece Ball Valve<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-1024x576.webp\" alt=\"\u30cd\u30b8\u5f0f\u3068\u6eb6\u63a5\u5f0f\u30c4\u30fc\u30d4\u30fc\u30b9\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u306e\u6bd4\u8f03\u3001\u6eb6\u63a5\u30dc\u30c7\u30a3\u306e\u65b9\u304c\u30ea\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u304c1\u3064\u5c11\u306a\u3044\" class=\"wp-image-4107\" srcset=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-1024x576.webp 1024w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-300x169.webp 300w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-768x432.webp 768w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-1536x864.webp 1536w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-18x10.webp 18w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve-600x338.webp 600w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/threaded-vs-welded-ball-valve.webp 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In a <strong>welded-body<\/strong> 2-piece design, the two body halves are welded into a single integrated body instead of being screwed or bolted together. The finished valve has no bolted body joint, so there is no body gasket to age and no body fasteners to lose preload at that location. In plain terms: it reduces one potential external leak path. It does not remove the others, and it is not a claim that the valve cannot leak.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A note on naming, because the word &#8220;welded&#8221; does double duty in valve catalogs. Most of the time, a &#8220;welded ball valve&#8221; refers to the end connections \u2014 socket-weld or butt-weld ends that are welded to the pipe during installation. That is not what this page is about. Here, &#8220;welded-body&#8221; describes how the two halves of the valve body are joined to each other; the ends of this particular valve are female threaded (F\u00d7F). If weld-end connections are what you need, that is a different product \u2014 our <a href=\"https:\/\/ballvalves.tw\/ja\/%e8%a3%bd%e5%93%81\/2%e3%83%94%e3%83%bc%e3%82%b9%e7%aa%81%e5%90%88%e3%81%9b%e6%ba%b6%e6%8e%a5%e3%83%9c%e3%83%bc%e3%83%ab%e3%83%90%e3%83%ab%e3%83%96-304-316%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e9%8b%bc-%e3%83%95\/\">two-piece butt-weld ball valve<\/a> \u2014 and the two constructions answer different questions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u79c1\u305f\u3061\u306e <a href=\"https:\/\/ballvalves.tw\/ja\/%e8%a3%bd%e5%93%81\/%e6%ba%b6%e6%8e%a5%e5%bc%8f%e6%9c%ac%e4%bd%93-2%e3%83%94%e3%83%bc%e3%82%b9%e3%83%9c%e3%83%bc%e3%83%ab%e3%83%90%e3%83%ab%e3%83%96-1000-wog\/\">welded-body 2-piece stainless steel ball valve (F\u00d7F threaded, full port, 1000 WOG)<\/a> is built this way. Its published range: CF8 (cast 304) or CF8M (cast 316) stainless steel body, female threaded ends (F\u00d7F) in PT, NPT or PF from 1\/4\u2033 to 4\u2033, full port, manual quarter-turn lever, rated 1000 WOG (a cold working pressure rating for water, oil and gas service), available as a Heavy-Duty series (V-2B) and a Standard series (V-2C). One boundary worth stating: the welded-body covers the 1\/4\u2033\u20133\u2033 sizes; the 4\u2033 model uses a bolted end-cap construction instead. The applications listed for it are water, oil, gas and air lines, tank and pump isolation, and OEM machinery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A fair question at this point: if the goal is a body with no bolted joint, why not simply use a 1-piece ball valve? Because of what the one-piece casting costs at the bore. In most 1-piece designs the internals are assembled through the end connection, so the port is typically reduced \u2014 the flow path is one size smaller than the pipe, with the extra pressure drop that brings. The welded-body construction takes the other route: assemble the internals with the body in two halves, then weld the halves into one integrated body. The result combines the full-port flow of a 2-piece with the monolithic body of a 1-piece \u2014 no body gasket, no body fasteners. To keep the comparison honest: the weld is still a manufacturing joint, but a fused metallurgical one, not a sealed mechanical interface with a gasket to age or preload to maintain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6eb6\u63a5\u5f8c\u306b\u6b8b\u308b\u306e\u306f\u3001\u30b9\u30c6\u30e0\u304c\u4f9d\u7136\u3068\u3057\u3066\u5727\u529b\u5883\u754c\u3092\u8cab\u901a\u3057\u3066\u304a\u308a\u3001\u30d0\u30eb\u30d6\u304c\u4f9d\u7136\u3068\u3057\u3066\u4e21\u7aef\u3067\u914d\u7ba1\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u6eb6\u63a5\u30dc\u30c7\u30a3\u5f0f\u30d0\u30eb\u30d6\u306b\u306f\u4f9d\u7136\u3068\u3057\u3066\u5bc6\u9589\u3055\u308c\u305f\u63a5\u5408\u90e8\u304c\u5b58\u5728\u3057\u307e\u3059\u304c\u3001\u30dc\u30c7\u30a3\u81ea\u4f53\u306b\u3042\u308b\u63a5\u5408\u90e8\u304c1\u3064\u5c11\u306a\u304f\u306a\u3063\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There is also a trade-off to state plainly. A welded-body is not made to be opened. If your maintenance practice depends on taking a valve apart in place to service the internals, this construction works against you, and a 3-piece design deserves the comparison. More on that below.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What a welded-body Does Not Solve<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A welded-body addresses exactly one thing: the external leak path at a bolted body joint. Every other leak mechanism on the valve is untouched by it.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b9\u30c6\u30e0\u306e\u30b7\u30fc\u30eb\u3002.<\/strong> \u30b9\u30c6\u30e0\u306f\u56de\u8ee2\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u72ec\u81ea\u306e\u30b7\u30fc\u30eb\u6a5f\u69cb\u3092\u5099\u3048\u3066\u672c\u4f53\u3092\u901a\u904e\u3057\u307e\u3059\u3002\u30b9\u30c6\u30e0\u304b\u3089\u306e\u6f0f\u308c\u306f\u3001\u305d\u306e\u30b7\u30fc\u30eb\u306e\u8a2d\u8a08\u3084\u72b6\u614b\u306b\u3088\u3063\u3066\u6c7a\u307e\u308b\u3082\u306e\u3067\u3042\u308a\u3001\u672c\u4f53\u306e\u4e21\u534a\u8eab\u304c\u3069\u306e\u3088\u3046\u306b\u63a5\u5408\u3055\u308c\u3066\u3044\u308b\u304b\u306b\u306f\u4f9d\u5b58\u3057\u307e\u305b\u3093\u3002.<\/li>\n\n\n\n<li><strong>\u5185\u90e8\u6f0f\u308c\u3002.<\/strong> \u3069\u306e\u69cb\u9020\u306e\u30d0\u30eb\u30d6\u3067\u3042\u3063\u3066\u3082\u3001\u30b7\u30fc\u30c8\u90e8\u306e\u6469\u8017\u3001\u30dc\u30fc\u30eb\u3068\u30b7\u30fc\u30c8\u306e\u9593\u306b\u7570\u7269\u304c\u631f\u307e\u3063\u305f\u5834\u5408\u3001\u3042\u308b\u3044\u306f\u30dc\u30fc\u30eb\u306e\u8868\u9762\u304c\u640d\u50b7\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u9589\u3058\u305f\u72b6\u614b\u306e\u30d0\u30eb\u30d6\u304b\u3089\u6d41\u4f53\u304c\u6f0f\u308c\u51fa\u3057\u307e\u3059\u3002.<\/li>\n\n\n\n<li><strong>\u914d\u7ba1\u7aef\u90e8\u306e\u6f0f\u308c\u3002.<\/strong> \u914d\u7ba1\u3078\u306e\u306d\u3058\u8fbc\u307f\u3001\u6eb6\u63a5\u3001\u307e\u305f\u306f\u30d5\u30e9\u30f3\u30b8\u306b\u3088\u308b\u63a5\u7d9a\u306f\u3001\u8a2d\u7f6e\u4f5c\u696d\u4e2d\u306b\u884c\u308f\u308c\u307e\u3059\u3002\u305d\u306e\u6c17\u5bc6\u6027\u306f\u3001\u8a2d\u7f6e\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u306b\u95a2\u3059\u308b\u554f\u984c\u3067\u3059\u3002.<\/li>\n\n\n\n<li><strong>\u4e0d\u9069\u5207\u306a\u6750\u6599\u3001\u307e\u305f\u306f\u5727\u529b\u30fb\u6e29\u5ea6\u6761\u4ef6\u3002.<\/strong> \u6d41\u4f53\u3001\u6fc3\u5ea6\u3001\u5727\u529b\u3001\u307e\u305f\u306f\u6e29\u5ea6\u306b\u9069\u3055\u306a\u3044\u6750\u8cea\u3084\u5b9a\u683c\u306e\u30d0\u30eb\u30d6\u306f\u3001\u672c\u4f53\u306e\u69cb\u9020\u306b\u304b\u304b\u308f\u3089\u305a\u6545\u969c\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/li>\n\n\n\n<li><strong>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3068\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u5f71\u97ff\u3002.<\/strong> \u7de0\u3081\u4ed8\u3051\u904e\u591a\u3001\u914d\u7ba1\u3078\u306e\u5fdc\u529b\u3001\u5727\u529b\u30b5\u30fc\u30b8\u3001\u632f\u52d5\u3001\u304a\u3088\u3073\u30a2\u30af\u30c1\u30e5\u30a8\u30fc\u30bf\u306e\u4e0d\u5177\u5408\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u69cb\u9020\u306e\u30dc\u30c7\u30a3\u3067\u3082\u9632\u304e\u304d\u308c\u306a\u3044\u6f0f\u308c\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So if the leak you are chasing is at the stem, at a pipe end, or through a closed valve, switching to a welded-body will not fix it. Identify the leak point first; the table at the top of this article is the place to start.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When a Welded-Body 2-Piece Design May Be Worth Considering<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-1024x576.webp\" alt=\"\u6eb6\u63a5\u3055\u308c\u305f\u30c4\u30fc\u30d4\u30fc\u30b9\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u3067\u3001\u30ea\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u304c1\u3064\u5c11\u306a\u3044\u30ef\u30f3\u30d4\u30fc\u30b9\u30dc\u30c7\u30a3\u30fc\" class=\"wp-image-4110\" srcset=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-1024x576.webp 1024w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-300x169.webp 300w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-768x432.webp 768w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-1536x864.webp 1536w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-18x10.webp 18w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve-600x338.webp 600w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/welded-two-piece-ball-valve.webp 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>welded-body<\/strong> 2-piece valve is worth a look when the external body-joint leak path is specifically what you want to remove, the duty is on\/off isolation, and your maintenance plan replaces valves rather than rebuilding them. If planned access to the internals matters more, compare a 3-piece design instead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u304a\u5ba2\u69d8\u304b\u3089\u3053\u306e\u69cb\u9020\u306b\u3064\u3044\u3066\u8cea\u554f\u3092\u53d7\u3051\u308b\u5178\u578b\u7684\u306a\u72b6\u6cc1\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6307\u6458\u3055\u308c\u3066\u3044\u308b\u61f8\u5ff5\u306f\u3001\u5177\u4f53\u7684\u306b\u306f\u672c\u4f53\u63a5\u5408\u90e8\u304b\u3089\u306e\u5916\u90e8\u3078\u306e\u6f0f\u308c\u3067\u3042\u308a\u3001\u672c\u4f53\u4e0a\u306e\u5bc6\u9589\u63a5\u5408\u90e8\u306e\u6570\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u660e\u793a\u3055\u308c\u305f\u76ee\u6a19\u3068\u306a\u3063\u3066\u3044\u308b\u3002.<\/li>\n\n\n\n<li>\u3053\u306e\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u30d0\u30eb\u30d6\u5185\u90e8\u306e\u73fe\u5834\u3067\u306e\u30aa\u30fc\u30d0\u30fc\u30db\u30fc\u30eb\u3092\u60f3\u5b9a\u3057\u305f\u4f5c\u696d\u3067\u306f\u306a\u304f\u3001\u30aa\u30f3\uff0f\u30aa\u30d5\u306e\u906e\u65ad\uff08\u30bf\u30f3\u30af\u306e\u906e\u65ad\u3001\u30dd\u30f3\u30d7\u306e\u906e\u65ad\u3001\u533a\u9593\u306e\u906e\u65ad\uff09\u3092\u76ee\u7684\u3068\u3057\u305f\u3082\u306e\u3067\u3059\u3002.<\/li>\n\n\n\n<li>\u305d\u306e\u30e9\u30a4\u30f3\u306e\u4fdd\u5b88\u65b9\u91dd\u306f\u300c\u4fee\u7406\u3067\u306f\u306a\u304f\u4ea4\u63db\u300d\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30d0\u30eb\u30d6\u304c\u8010\u7528\u5e74\u6570\u306b\u9054\u3057\u305f\u5834\u5408\u306f\u3001\u5206\u89e3\u3057\u3066\u4fee\u7406\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4ea4\u63db\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3001\u70b9\u691c\u3001\u6e05\u6383\u3001\u307e\u305f\u306f\u5185\u90e8\u90e8\u54c1\u306e\u4ea4\u63db\u306e\u305f\u3081\u306b\u30d0\u30eb\u30d6\u3092\u958b\u3051\u308b\u4f5c\u696d\u3092\u884c\u3046\u5834\u5408\u306f\u30013\u30d4\u30fc\u30b9\u69cb\u9020\u306e\u88fd\u54c1\u304c\u6700\u9069\u3067\u3059\u3002\u3053\u306e\u69cb\u9020\u306f\u3001\u30e2\u30c7\u30eb\u306b\u3088\u3063\u3066\u306f\u5185\u90e8\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u5f53\u793e\u306e <a href=\"https:\/\/ballvalves.tw\/ja\/%e3%83%a1%e3%83%b3%e3%83%86%e3%83%8a%e3%83%b3%e3%82%b9%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a3%e3%83%94%e3%83%bc%e3%82%b9%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e8%a3%bd%e5%b7%a5%e6%a5%ad%e7%94%a8\/\">3\u30d4\u30fc\u30b9\u5f0f\u30b9\u30c6\u30f3\u30ec\u30b9\u88fd\u30d0\u30eb\u30d6\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u30ac\u30a4\u30c9<\/a> \u305d\u306e\u4fdd\u5b88\u6027\u304c\u5b9f\u969b\u306b\u306f\u3069\u306e\u3088\u3046\u306a\u3082\u306e\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8003\u5bdf<\/th><th><strong>Welded-body<\/strong> 2-piece<\/th><th>3\u30d4\u30fc\u30b9\u69cb\u9020<\/th><\/tr><\/thead><tbody><tr><td>\u5727\u529b\u5883\u754c\u4e0a\u306e\u4f53\u306e\u63a5\u70b9<\/td><td>\u306a\u3057\u30022\u3064\u306e\u534a\u8eab\u3092\u6eb6\u63a5\u3057\u30661\u3064\u306e\u4e00\u4f53\u578b\u672c\u4f53\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/td><td>\u4e2d\u592e\u672c\u4f53\u3068\u4e21\u7aef\u306e\u30a8\u30f3\u30c9\u30ad\u30e3\u30c3\u30d7\u9593\u306e\u30dc\u30eb\u30c8\u63a5\u5408\u90e8<\/td><\/tr><tr><td>\u5185\u90e8\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/td><td>\u958b\u5c01\u306f\u60f3\u5b9a\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u5bff\u547d\u304c\u5c3d\u304d\u305f\u5834\u5408\u306f\u3001\u901a\u5e38\u3001\u30d0\u30eb\u30d6\u306e\u4ea4\u63db\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/td><td>\u30e2\u30c7\u30eb\u306b\u3088\u3063\u3066\u306f\u3001\u70b9\u691c\u3084\u6574\u5099\u306e\u305f\u3081\u306b\u30dc\u30c7\u30a3\u3092\u958b\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/td><\/tr><tr><td>\u3069\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u9069\u3057\u3066\u3044\u308b\u304b<\/td><td>\u5916\u90e8\u3068\u306e\u5bc6\u9589\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6570\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u512a\u5148\u3055\u308c\u308b\u30aa\u30f3\uff0f\u30aa\u30d5\u7d76\u7e01<\/td><td>\u5b9a\u671f\u7684\u306a\u5185\u90e8\u70b9\u691c\u3084\u90e8\u54c1\u4ea4\u63db\u304c\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u4e00\u74b0\u3068\u306a\u3063\u3066\u3044\u308b\u30b5\u30fc\u30d3\u30b9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3069\u3061\u3089\u306e\u69cb\u9020\u3082\u3001\u4e00\u6982\u306b\u512a\u308c\u3066\u3044\u308b\u3068\u306f\u8a00\u3048\u307e\u305b\u3093\u3002\u30ab\u30c6\u30b4\u30ea\u30fc\u3060\u3051\u3067\u5224\u65ad\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5404\u30e2\u30c7\u30eb\u3054\u3068\u306b\u3001\u4ea4\u63db\u90e8\u54c1\u306e\u5165\u624b\u53ef\u80fd\u6027\u3084\u5b9f\u969b\u306e\u4f7f\u7528\u6761\u4ef6\u3092\u8e0f\u307e\u3048\u3066\u9078\u629e\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ed5\u69d8\u3092\u6c7a\u5b9a\u3059\u308b\u524d\u306b\uff1a\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dc\u30c7\u30a3\u30b9\u30bf\u30a4\u30eb\u306f\u3001\u6700\u521d\u306b\u6c7a\u3081\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u6700\u5f8c\u306b\u6c7a\u3081\u308b\u3079\u304d\u4e8b\u9805\u306e\u4e00\u3064\u3067\u3059\u3002\u3069\u306e\u65b9\u5411\u306b\u50be\u3044\u3066\u3044\u3066\u3082\u3001\u30d0\u30eb\u30d6\u3092\u6c7a\u5b9a\u3059\u308b\u524d\u306b\u3001\u30b5\u30fc\u30d3\u30b9\u306b\u95a2\u3059\u308b\u4ee5\u4e0b\u306e\u70b9\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6d41\u4f53\u3068\u6fc3\u5ea6<\/strong> \u2014 \u5358\u306b\u305d\u306e\u300c\u7a2e\u985e\u300d\u3060\u3051\u3067\u306a\u304f\u3001\u5177\u4f53\u7684\u306a\u5a92\u4f53\u305d\u306e\u3082\u306e\u3067\u3059\u3002\u6fc3\u5ea6\u3084\u4e0d\u7d14\u7269\u306e\u6709\u7121\u306b\u3088\u3063\u3066\u3001\u6750\u6599\u306e\u9069\u6027\u304c\u5909\u308f\u308a\u307e\u3059\u3002.<\/li>\n\n\n\n<li><strong>\u52d5\u4f5c\u6e29\u5ea6<\/strong> \u2014 \u901a\u5e38\u6642\u3068\u30d4\u30fc\u30af\u6642\u3002.<\/li>\n\n\n\n<li><strong>\u4f5c\u52d5\u5727\u529b<\/strong> \u2014 \u5b9a\u683c\u5024\u3060\u3051\u3067\u306a\u304f\u3001\u904e\u6e21\u73fe\u8c61\u3084\u30b5\u30fc\u30b8\u3082\u542b\u3080\u3002.<\/li>\n\n\n\n<li><strong>\u30d1\u30a4\u30d7\u306e\u30b5\u30a4\u30ba<\/strong> \u2014 \u305d\u3057\u3066\u3001\u30d5\u30eb\u30dd\u30fc\u30c8\u304c\u3042\u306a\u305f\u306e\u30d5\u30ed\u30fc\u306b\u3068\u3063\u3066\u91cd\u8981\u304b\u3069\u3046\u304b\u3002.<\/li>\n\n\n\n<li><strong>\u63a5\u7d9a\u3092\u7d42\u4e86\u3059\u308b<\/strong> \u2014 \u306d\u3058\u8fbc\u307f\u5f0f\u3001\u6eb6\u63a5\u5f0f\u3001\u307e\u305f\u306f\u30d5\u30e9\u30f3\u30b8\u5f0f\u3067\u3042\u308b\u3053\u3068\u3001\u304a\u3088\u3073\u914d\u7ba1\u304c\u6e96\u62e0\u3059\u308b\u898f\u683c\u3002.<\/li>\n\n\n\n<li><strong>\u5fc5\u8981\u306a\u906e\u65ad\u80fd\u529b<\/strong> \u2014 \u6642\u6298\u30aa\u30f3\uff0f\u30aa\u30d5\u3092\u7e70\u308a\u8fd4\u3059\u7d76\u7e01\u72b6\u614b\u3001\u3042\u308b\u3044\u306f\u3001\u5185\u90e8\u906e\u65ad\u306e\u8981\u4ef6\u304c\u53b3\u3057\u3044\u72b6\u6cc1\u4e0b\u3067\u306e\u983b\u7e41\u306a\u30b5\u30a4\u30af\u30eb\u3002.<\/li>\n\n\n\n<li><strong>\u4fdd\u5b88\u7528\u30a2\u30af\u30bb\u30b9<\/strong> \u2014 \u3053\u306e\u30d0\u30eb\u30d6\u306f\u3001\u305d\u306e\u5834\u3067\u4fee\u7406\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3001\u305d\u308c\u3068\u3082\u5bff\u547d\u304c\u5c3d\u304d\u305f\u3089\u4ea4\u63db\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/li>\n\n\n\n<li><strong>\u5916\u90e8\u307e\u305f\u306f\u5185\u90e8\u306e\u6f0f\u308c<\/strong> \u2014 \u5b9f\u969b\u306b\u306f\u3069\u3061\u3089\u304c\u554f\u984c\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u305d\u308c\u3089\u306f\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u89e3\u6c7a\u7b56\u3092\u793a\u5506\u3057\u3066\u3044\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-1024x576.webp\" alt=\"304\u3068316\u30b9\u30c6\u30f3\u30ec\u30b9\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u306e\u8010\u8150\u98df\u6027\u3068\u8010\u6f0f\u6db2\u6027\u306e\u6750\u8cea\u6bd4\u8f03\" class=\"wp-image-4109\" srcset=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-1024x576.webp 1024w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-300x169.webp 300w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-768x432.webp 768w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-1536x864.webp 1536w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-18x10.webp 18w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316-600x338.webp 600w, https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/06\/ball-valve-304-vs-316.webp 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u70b9\u306b\u95a2\u3057\u3066\u306f\u30012\u3064\u306e\u4e00\u822c\u7684\u306a\u53c2\u8003\u8cc7\u6599\u304c\u53c2\u8003\u306b\u306a\u308a\u307e\u3059\u3002\u6750\u8cea\u306b\u3064\u3044\u3066\uff1a\u5f53\u793e\u306e\u88fd\u54c1\u30e9\u30a4\u30f3\u30ca\u30c3\u30d7\u3067\u306f\u3001304\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u304c\u591a\u304f\u306e\u6c34\u30fb\u7a7a\u6c17\u914d\u7ba1\u7528\u9014\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u5869\u5316\u7269\u306b\u3055\u3089\u3055\u308c\u3066\u5b54\u98df\u306e\u30ea\u30b9\u30af\u304c\u9ad8\u307e\u308b\u5834\u5408\u306b\u306f\u3001\u901a\u5e38\u3001316\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u3078\u306e\u30b0\u30ec\u30fc\u30c9\u30a2\u30c3\u30d7\u304c\u884c\u308f\u308c\u307e\u3059\u3002\u8150\u98df\u30e1\u30ab\u30cb\u30ba\u30e0\u306b\u95a2\u3059\u308b\u80cc\u666f\u60c5\u5831\u306f\u3001\u4ee5\u4e0b\u306e\u8cc7\u6599\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002 <a href=\"https:\/\/www.ampp.org\/technical-research\/impact\/corrosion-basics\" target=\"_blank\" rel=\"noopener\">AMPP\u306e\u8150\u98df\u306b\u95a2\u3059\u308b\u57fa\u790e\u77e5\u8b58<\/a>. \u5b9a\u683c\u306b\u3064\u3044\u3066\uff1a\u30d0\u30eb\u30d6\u306e\u5727\u529b\u30fb\u6e29\u5ea6\u5b9a\u683c\u306b\u95a2\u3059\u308b\u6163\u884c\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u898f\u683c\u3067\u898f\u5b9a\u3055\u308c\u3066\u3044\u308b\u3002 <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-34-valves-flanged-threaded-welding-end\" target=\"_blank\" rel=\"noopener\">ASME B16.34<\/a>; WOG\u756a\u53f7\u306f\u5727\u529b\u30fb\u6e29\u5ea6\u66f2\u7dda\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u5b9f\u969b\u306e\u4f7f\u7528\u6e29\u5ea6\u306b\u304a\u3051\u308b\u9069\u5408\u6027\u3092\u5fc5\u305a\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Does a welded-body mean the valve cannot leak?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. A welded-body removes the bolted body joint, which is one potential external leak path, not all of them. The stem still passes through the body and relies on its own sealing. The pipe-end connections still depend on correct installation. Shutoff still depends on the condition of the ball and seats. A welded-body valve in the wrong material, at the wrong pressure or temperature, or installed badly can still leak. Treat the welded-body as one structural factor inside a complete specification, not as a guarantee.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a welded-body 2-piece valve prevent internal leakage?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3044\u3044\u3048\u3002\u5185\u90e8\u6f0f\u308c\u3001\u3064\u307e\u308a\u30d0\u30eb\u30d6\u304c\u9589\u3058\u305f\u72b6\u614b\u3067\u30dc\u30fc\u30eb\u3092\u901a\u904e\u3059\u308b\u6d41\u308c\u306f\u3001\u672c\u4f53\u306e\u4e21\u534a\u8eab\u306e\u63a5\u5408\u65b9\u6cd5\u3067\u306f\u306a\u304f\u3001\u30b7\u30fc\u30c8\u3068\u30dc\u30fc\u30eb\u306e\u8868\u9762\u306b\u3088\u3063\u3066\u6c7a\u307e\u308a\u307e\u3059\u3002 \u30b7\u30fc\u30c8\u90e8\u306e\u6469\u8017\u3001\u30dc\u30fc\u30eb\u3068\u30b7\u30fc\u30c8\u306e\u9593\u306b\u631f\u307e\u3063\u305f\u7570\u7269\u3001\u3042\u308b\u3044\u306f\u4e0d\u9069\u5207\u306a\u4f7f\u7528\u6761\u4ef6\u306b\u3088\u308b\u640d\u50b7\u306f\u3001\u6eb6\u63a5\u5f0f\u3067\u3042\u308c\u30dc\u30eb\u30c8\u7de0\u7d50\u5f0f\u3067\u3042\u308c\u3001\u3042\u3089\u3086\u308b\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u3067\u5185\u90e8\u6f0f\u308c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30d0\u30eb\u30d6\u304c\u9589\u307e\u3063\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u6d41\u4f53\u304c\u901a\u904e\u3057\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u554f\u984c\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u307e\u305a\u30b7\u30fc\u30c8\u306e\u72b6\u614b\u3001\u6d41\u4f53\u306e\u6e05\u6d44\u5ea6\u3001\u304a\u3088\u3073\u30c7\u30e5\u30fc\u30c6\u30a3\u30b5\u30a4\u30af\u30eb\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u5834\u5408\u3001\u672c\u4f53\u306e\u69cb\u9020\u306f\u91cd\u8981\u306a\u8981\u56e0\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why not just use a 1-piece ball valve instead?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A 1-piece body does remove the bolted body joint, but in most designs it costs you the bore: the internals go in through the end connection, so the port is typically reduced \u2014 one size smaller than the pipe, with higher pressure drop. A welded-body 2-piece is assembled as two halves and then welded into one integrated body, which keeps the full-port bore while still ending with no gasketed joint on the body. If a reduced port is acceptable for your flow, a 1-piece valve is a reasonable choice; if full port matters, that is where the welded-body construction earns its place.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3069\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u30013\u30d4\u30fc\u30b9\u5f0f\u30dc\u30fc\u30eb\u30d0\u30eb\u30d6\u304c\u9069\u3057\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30f3\u30e9\u30a4\u30f3\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u91cd\u8981\u306a\u5834\u5408\u306f\u30013\u30d4\u30fc\u30b9\u69cb\u9020\u306e\u88fd\u54c1\u3092\u691c\u8a0e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u672c\u4f53\u69cb\u9020\u306b\u3088\u308a\u3001\u30e2\u30c7\u30eb\u306b\u3088\u3063\u3066\u306f\u30d0\u30eb\u30d6\u5185\u90e8\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3068\u306a\u308a\u3001\u70b9\u691c\u3084\u6574\u5099\u304c\u884c\u3048\u307e\u3059\u3002 \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u4f5c\u696d\u306b\u304a\u3044\u3066\u3001\u30d0\u30eb\u30d6\u5168\u4f53\u3092\u4ea4\u63db\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8a08\u753b\u7684\u306a\u70b9\u691c\u3084\u5185\u90e8\u90e8\u54c1\u306e\u4ea4\u63db\u3092\u884c\u3046\u5834\u5408\u3001\u3053\u306e\u30a2\u30af\u30bb\u30b9\u6027\u306e\u826f\u3055\u306f\u3001\u672c\u4f53\u63a5\u5408\u90e8\u306e\u5897\u52a0\u306b\u3088\u308b\u30c7\u30e1\u30ea\u30c3\u30c8\u3092\u4e0a\u56de\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u63a5\u5408\u90e8\u306f\u3001\u5358\u306b\u70b9\u691c\u4f5c\u696d\u306e\u4e00\u90e8\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002\u30b9\u30da\u30a2\u30d1\u30fc\u30c4\u306e\u5165\u624b\u53ef\u80fd\u6027\u3084\u5b9f\u969b\u306e\u4f7f\u7528\u74b0\u5883\u306b\u3088\u3063\u3066\u5224\u65ad\u3059\u3079\u304d\u70b9\u3067\u3059\u304c\u3001\u5f53\u793e\u306e <a href=\"https:\/\/ballvalves.tw\/ja\/%e3%83%a1%e3%83%b3%e3%83%86%e3%83%8a%e3%83%b3%e3%82%b9%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a3%e3%83%94%e3%83%bc%e3%82%b9%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e8%a3%bd%e5%b7%a5%e6%a5%ad%e7%94%a8\/\">3\u30d4\u30fc\u30b9\u5f0f\u30b9\u30c6\u30f3\u30ec\u30b9\u88fd\u30d0\u30eb\u30d6\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u30ac\u30a4\u30c9<\/a> \u305d\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306e\u624b\u9806\u9762\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1000 WOG\u306f\u3001\u84b8\u6c17\u3084\u9ad8\u6e29\u74b0\u5883\u3067\u306e\u4f7f\u7528\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3044\u3044\u3048\u3002\u300c1000 WOG\u300d\u3068\u3044\u3046\u8868\u793a\u81ea\u4f53\u306f\u3001\u6c34\u3001\u6cb9\u3001\u30ac\u30b9\u7528\u9014\u306b\u304a\u3051\u308b\u51b7\u9593\u52a0\u5de5\u8010\u5727\u7b49\u7d1a\u3092\u8868\u3059\u3082\u306e\u3067\u3059\u3002\u3053\u308c\u306f\u84b8\u6c17\u7528\u898f\u683c\u3067\u306f\u306a\u304f\u3001\u5727\u529b\u30fb\u6e29\u5ea6\u66f2\u7dda\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, this welded-body 2-piece ball valve can be specified with a graphite sealing configuration for steam service up to 180\u00b0C. That temperature capability applies only to the specified graphite configuration; it must not be assumed for the standard seal arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u84b8\u6c17\u306e\u9078\u5b9a\u306b\u3042\u305f\u3063\u3066\u306f\u3001\u4f9d\u7136\u3068\u3057\u3066\u3001\u305d\u306e\u6e29\u5ea6\u306b\u304a\u3051\u308b\u5b9f\u969b\u306e\u4f7f\u7528\u5727\u529b\u3001\u6b63\u78ba\u306a\u30d0\u30eb\u30d6\u578b\u5f0f\u3001\u30b0\u30e9\u30d5\u30a1\u30a4\u30c8\u30b7\u30fc\u30eb\u306e\u69cb\u6210\u3001\u304a\u3088\u3073\u4f7f\u7528\u6761\u4ef6\u3092\u7dcf\u5408\u7684\u306b\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002WOG\u756a\u53f7\u306e\u307f\u306b\u57fa\u3065\u3044\u3066\u84b8\u6c17\u7528\u30d0\u30eb\u30d6\u3092\u9078\u5b9a\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f53\u6db2\u3084\u95a2\u7bc0\u6db2\u306e\u6f0f\u308c\u304c\u5fc3\u914d\u3067\u3059\u304b\uff1f\u307e\u305a\u306f\u4f7f\u7528\u6761\u4ef6\u3092\u898b\u76f4\u3057\u307e\u3057\u3087\u3046<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u304a\u5ba2\u69d8\u306e\u914d\u7ba1\u30e9\u30a4\u30f3\u306b\u304a\u3044\u3066\u3001\u672c\u4f53\u306e\u63a5\u5408\u90e8\u304b\u3089\u306e\u5916\u90e8\u6f0f\u308c\u304c\u61f8\u5ff5\u3055\u308c\u308b\u5834\u5408\u306f\u3001\u6d41\u4f53\u3068\u305d\u306e\u6fc3\u5ea6\u3001\u4f7f\u7528\u5727\u529b\u3068\u6e29\u5ea6\u3001\u914d\u7ba1\u30b5\u30a4\u30ba\u3001\u7aef\u90e8\u63a5\u7d9a\u65b9\u5f0f\u3001\u304a\u3088\u3073\u30d0\u30eb\u30d6\u306e\u4fdd\u5b88\u8a08\u753b\u306b\u3064\u3044\u3066\u304a\u77e5\u3089\u305b\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u60c5\u5831\u3092\u3082\u3068\u306b\u3001\u9069\u5207\u306a\u88fd\u54c1\u9078\u3073\u306e\u304a\u624b\u4f1d\u3044\u3092\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002 <a href=\"https:\/\/ballvalves.tw\/ja\/%e8%a3%bd%e5%93%81\/%e6%ba%b6%e6%8e%a5%e5%bc%8f%e6%9c%ac%e4%bd%93-2%e3%83%94%e3%83%bc%e3%82%b9%e3%83%9c%e3%83%bc%e3%83%ab%e3%83%90%e3%83%ab%e3%83%96-1000-wog\/\">welded-body 2-piece design<\/a> \u304a\u5ba2\u69d8\u306e\u5177\u4f53\u7684\u306a\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u30013\u30d4\u30fc\u30b9\u8a2d\u8a08\u3068\u306e\u6bd4\u8f03\u691c\u8a0e\u3092\u884c\u3044\u307e\u3059\u30023\u30d4\u30fc\u30b9\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408\u3082\u3001\u305d\u306e\u65e8\u3092\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002. <a href=\"https:\/\/ballvalves.tw\/ja\/%e3%82%b3%e3%83%b3%e3%82%bf%e3%82%af%e3%83%88\/\">Yzng Trong \u3078\u306e\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u304a\u5ba2\u69d8\u306e\u30b5\u30fc\u30d3\u30b9\u8a73\u7d30\u3092\u304a\u77e5\u3089\u305b\u3044\u305f\u3060\u3051\u308c\u3070\u3001\u4e00\u822c\u7684\u306a\u63a8\u5968\u4e8b\u9805\u3067\u306f\u306a\u304f\u3001\u5177\u4f53\u7684\u306a\u6bd4\u8f03\u8868\u3092\u3054\u63d0\u793a\u3044\u305f\u3057\u307e\u3059\u3002.<\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;Ball valve leaking&#8221; describes at least four different problems, and they have four different fixes. Before you compare valve designs, name the leak: This article is about the third one. A welded-body 2-piece ball valve has no bolted body joint, so it reduces one potential external leak path. That is a genuine structural difference. It is also a limited one: it does nothing for the stem, the pipe ends or the sealing of the closed ball. Both halves of that statement matter when you specify valves for an industrial line. Leak point Where you see it What it mainly depends on Stem \/ packing area Around the stem, under the [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":4106,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[48],"tags":[],"class_list":["post-4105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides-tutorials"],"_links":{"self":[{"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/posts\/4105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/comments?post=4105"}],"version-history":[{"count":18,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/posts\/4105\/revisions"}],"predecessor-version":[{"id":5185,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/posts\/4105\/revisions\/5185"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/media\/4106"}],"wp:attachment":[{"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/media?parent=4105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/categories?post=4105"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ballvalves.tw\/ja\/wp-json\/wp\/v2\/tags?post=4105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}