Product Name
Pneumatic 3-Way Vacuum Ball Valve, 316 Stainless – NW/KF Flange, L-Port / T-Port
Product Summary
A 316 stainless pneumatic 3-way vacuum ball valve — a rack-and-pinion air actuator (double-acting or spring-return, 4–8 bar) rotates the ball to divert one vacuum pump between chambers or vent a line. NW (KF) vacuum flanges in NW40 (1-1/2″) and NW50 (2″), L-port or T-port, PTFE seats, -20 °C to +180 °C. Polished CF8M body, ISO 5211 direct mount.
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ISO 9001 · CE · Manufacturer since 1999
PDFNW50 3-WayVacuum · NW/KF · Dimension SheetDownload ↓
Product Description
This pneumatic 3-way vacuum ball valve automates the switching of a vacuum line. A rack-and-pinion air actuator rotates the ball a quarter turn on a signal from your PLC or solenoid, diverting one vacuum pump between chambers, or venting a line — no one has to stand at the valve. The body is cast 316 stainless steel (ASTM A351 CF8M) with a polished surface and PTFE seats, on NW (KF) vacuum flanges in NW40 (1-1/2″) and NW50 (2″).
The ball is available L-port or T-port — L-port connects one outlet at a time, T-port can connect two outlets together or merge flow. Prefer to switch it by hand? See the manual 3-way vacuum valve. For straight (2-way) vacuum lines, see the NW50 pneumatic vacuum ball valve or the larger ISO-K DN80/DN100 pneumatic vacuum valve, or browse all vacuum valves.
L-Port or T-Port?
| L-port | T-port | |
|---|---|---|
| Flow | Connects the inlet to one outlet at a time | Connects two outlets, or merges flow between all three ports |
| Use for | Selecting between two chambers — one pump, one chamber at a time | Combining lines, or diverting while keeping a second path open |
Both are available in NW40 and NW50 — tell us which port pattern you need when you request a quote.
Valve Specifications
| Type | 3-way vacuum ball valve, pneumatically actuated |
| Model | V-3WVM |
| Sizes | NW40 (1-1/2″) and NW50 (2″) |
| Port | 3-way, L-port or T-port |
| Connection | NW (KF) vacuum flange — clamp and centring ring, no bolts |
| Body & ball | ASTM A351 CF8M — the cast form of 316 stainless steel — polished |
| Seat | PTFE |
| Working temperature | -20 °C to +180 °C |
| Mounting | ISO 5211 pad for the actuator |
Actuator Specifications
| Type | Rack-and-pinion, aluminum alloy body |
| Acting | Double Acting (DA) or Spring Return (SR) |
| Air supply | 4 – 8 bar (about 58 – 116 psi) |
| Options | Solenoid valve, limit switch box, positioner |
Dimensions (mm)
Body dimensions below; the pneumatic version replaces the lever with an air actuator on the ISO 5211 pad. Full drawings in the NW40 and NW50 dimension sheets (PDF).
| Size | L (length) | W (width) | Center distance | Flange ØD | Bore |
|---|---|---|---|---|---|
| NW40 (1-1/2″) | 181 | 175 | 88.5 | Ø55 | Ø38 |
| NW50 (2″) | 181 | 201 | 100.5 | Ø75 | Ø46 |
Application Fields & Locations
- Automated lab vacuum stations: switch one pump between chambers under PLC control.
- Composite & vacuum-bag molding: sequence vacuum across moulds without manual valves.
- Vacuum pump sequencing: divert a single pump across process steps automatically.
- Semiconductor & coating support lines: 316 stainless, polished, clamp-flanged KF piping.
FAQ
What is the difference between L-port and T-port? L-port connects the inlet to one outlet at a time — a selector. T-port can connect two outlets together or merge flow between all three ports. Tell us which pattern you need when you order.
Double-acting or spring-return — which should I choose? Double-acting (DA) uses air for both strokes and stays in its last position if air is lost. Spring-return (SR) uses springs for the return stroke, so on air loss the springs drive the valve to its preset position — useful for protecting a vacuum line.
Can I add a solenoid valve or limit switch? Yes. The actuator accepts a solenoid valve for control, a limit switch box for position feedback, and a positioner for modulating service — tell us your control setup when you request a quote.
Which sizes and flanges are available? NW40 (1-1/2″) and NW50 (2″), both on NW (KF) vacuum flanges. For larger ISO-K lines, see the ISO-K DN80/DN100 pneumatic vacuum valve.
What is the operating temperature? -20 °C to +180 °C, set by the PTFE seats. Body and ball are cast 316 stainless steel with a polished surface.
What is the minimum order? No minimum order quantity — we accept orders of any size, including small trial orders. For small orders, freight is arranged and paid by the buyer. Payment is by T/T — 30% on order confirmation, 70% before shipment.
See all 3-way ball valve models — manual, pneumatic, sanitary & vacuum →
Sample Policy
We are happy to provide product samples for customers to evaluate quality or conduct testing. The process typically begins with a quotation based on the customer’s specifications.
If the pricing is acceptable, we can offer samples either free of charge or at a cost depending on the product type and availability.
Shipping fees are borne by the customer.
Order Process
After confirming the product requirements and other details with the customer, we will issue a Sales Confirmation for approval. Once confirmed, the customer is required to pay a 30% deposit to proceed with production.
When mass production is completed and the goods pass inspection, the customer must pay the remaining 70% balance before shipment is arranged.
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FAQ
A. How can I request a quote?
Please provide a detailed inquiry sheet including product specifications, materials, quantities, and any special requirements. We will offer a quotation based on your request.
B. What are your quotation terms?
Our quotations are typically based on FOB terms. However, we can also offer CFR, CIF, or other Incoterms upon request.
C. What is your Minimum Order Quantity (MOQ)?
We have no MOQ. We operate on a made-to-order basis and accept orders of any size — trial orders are welcome. For smaller orders, freight is arranged and borne by the buyer.
D. What are your payment terms?
By T/T – 30% down payment upon order confirmation, and 70% balance before shipment.
E. What is your lead time?
Lead time depends on order quantity and specifications. We will confirm the exact schedule when you request a quote.
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