Product Name
Vacuum Rated Ball Valve, Pneumatic – NW50 KF (2″), ISO-K DN80 / DN100, 316 Two-Piece (V-2VN / V-2BN-ISOK)
Product Summary
A vacuum rated ball valve with a pneumatic actuator: two-piece 316 stainless body, full port, PTFE seats, ISO 5211 direct mount. Choose NW50 (ISO-KF / KF50) clamp ends at 2″ or ISO-K flanges at DN80 (3″) and DN100 (4″). The rack-and-pinion actuator, double acting or spring return, opens and closes the line on a signal. For fore-line and pump isolation, not as a high-vacuum chamber gate.
ISO 9001 · CE · Manufacturer since 1999 · Made in Taiwan
This vacuum rated ball valve is a two-piece 316 stainless steel pneumatic ball valve built for vacuum lines. It comes with two end styles: NW50 (ISO-KF / KF50) clamp flanges at 2″ (model V-2VN), or ISO-K flanges at ISO80 (DN80, 3″) and ISO100 (DN100, 4″) (model V-2BN-ISOK). Both share the same full-port body, PTFE seats and an ISO 5211 pad that takes a rack-and-pinion air actuator, double acting (DA) or spring return (SR), so the valve opens and closes on a signal instead of by hand.
Where This Vacuum Pump Isolation Valve Belongs in the System
A vacuum ball valve has a clear place in a vacuum system: on the pump side. Here is where this valve is used and what it does there.
| Position in the system | What the valve does there |
|---|---|
| Fore-line / roughing line isolation | Between the pump and the chamber, on the roughing or backing line: this is what a vacuum ball valve is for. |
| Vacuum pump isolation | Shutting a pump out of the line so it can be serviced or swapped without venting the whole system. |
| Gauge isolation | Protecting a vacuum gauge during rough-down or venting. |
← Swipe the table to see all columns →
For isolating a pump, a fore-line or a gauge, a ball valve is the straightforward, fast, full-bore answer, and with a pneumatic actuator it does that on a signal.
Key Technical Specifications
| Item | Specification |
|---|---|
| Type | Two-piece vacuum ball valve, pneumatically actuated (V-2VN / V-2BN-ISOK) |
| Body material | ASTM A351 CF8M (316 stainless steel) |
| Connection | NW50 (ISO-KF / KF50) clamp flange — 2″ (V-2VN) ISO-K vacuum flange — ISO80 (DN80, 3″) or ISO100 (DN100, 4″) (V-2BN-ISOK) |
| Port | Full port on all sizes |
| Seat & seal | PTFE |
| Operating temperature | Valve −20 °C to +180 °C · Actuator −20 °C to +80 °C |
| Actuator | Rack-and-pinion, aluminium alloy body, double acting (DA) or spring return (SR) |
| Air supply | 4 – 8 bar (about 58 – 116 psi) |
| Actuator mounting | ISO 5211 — the actuator bolts straight onto the valve, no bracket or coupling |
| Spring return position | Normally closed or normally open — specify when ordering |
| Options | Solenoid valve, limit switch box, positioner |
| Service | Automated isolation and sequencing on vacuum lines |
Vacuum Rated Valve Design: Why a Pneumatic Ball Valve
- Speed: vacuum sequences are timed. A hand valve makes the operator the bottleneck; an air actuator does not.
- Direct mount: the valve body carries an ISO 5211 pad, so the actuator bolts on with no bracket, no coupling, nothing to align.
- Spring return on air loss: an SR unit moves to the position you specified when the air supply goes. Tell us whether that position is open or closed and we will build it that way.
- Full bore: nothing narrows the line, so conductance is not sacrificed to the valve.
- 316 stainless, PTFE seats: a clean, corrosion-resistant combination for vacuum service.
Pneumatic Vacuum Valve Ends: NW50 KF or ISO-K
NW50 (ISO-KF / KF50), 2″ — V-2VN. The KF clamp flange seals with a single clamp and a centring ring, no bolts, so the valve connects straight into a standard KF line and opens tool-free for service. The dimension sheet above gives face-to-face length, height to actuator top, flange O.D. and tube O.D.
ISO-K ISO80 (DN80, 3″) and ISO100 (DN100, 4″) — V-2BN-ISOK. The ISO-K flange clamps straight into a standard ISO-K line, no adapter needed, for the larger fore-lines and pump connections where KF sizes run out.
Applications
- Vacuum pump isolation — shutting a pump out of the line for service without venting the system.
- Roughing and backing lines — isolating rotary-vane or scroll pumps from the chamber.
- Freeze-drying systems — isolating the vacuum line between the freeze dryer and its pump.
- Vacuum ovens — shutting off chamber vacuum before the pump is switched off.
- Laboratory vacuum piping — automated on/off on KF and ISO-K lines under PLC control.
Related: the hand-operated version of this valve is our manual vacuum valve; for diverting between two vacuum lines, see the 3-way vacuum ball valve. KF/NW centering rings are here.
FAQ
What flange sizes are available?
NW50 (ISO-KF / KF50) clamp flange at 2″ (V-2VN), and ISO-K in ISO80 (DN80, 3″) and ISO100 (DN100, 4″) (V-2BN-ISOK). Each clamps straight into its standard line — no adapter needed.
What is the difference between the NW50 KF version and the ISO-K version?
The valve, seats, actuator and ISO 5211 mounting are the same. The difference is the flange: KF is a small clamp flange that seals with one clamp and a centring ring, used for the 2″ size; ISO-K is the larger flange standard used for the 3″ and 4″ sizes. Choose by the flange already on your line.
Double acting or spring return — which should I choose?
Double acting uses air to open and air to close, and holds its last position if the air supply is lost. Spring return uses air one way and a spring the other, so it moves to a preset position when air is lost. Tell us whether that position should be open or closed and we will build it that way.
What is the operating temperature range?
Valve −20 °C to +180 °C, set by the PTFE seats. Actuator −20 °C to +80 °C.
Does the actuator need a bracket?
No. The valve body has an ISO 5211 mounting pad, so the actuator bolts straight on — nothing to machine, nothing to align.
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.
Is there a minimum order quantity?
No. We have no MOQ. Tell us what you need and we will quote it.
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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