Edwards PV40 Pipeline Valve for Diffstak Diffusion Vacuum Pump NW40 Pneumatic

Edwards PV40 Pipeline Valve for Diffstak Diffusion Vacuum Pump NW40 Pneumatic

The Edwards PV40 is a pneumatically actuated pipeline valve designed for use in high-vacuum diffusion pump systems. It isolates or controls gas flow between sections of a vacuum pipeline, and is sized for NW40 (DN40) centering-ring connections — the standard port size used on many Edwards Diffstak series diffusion pumps. The valve body is machined aluminum alloy with a top-mounted pneumatic actuator that opens and closes the valve via compressed air or gas signal.

Specifications & What's Included

• Brand: Edwards (Edwards High Vacuum, Part of B.O.C. Ltd., Crawley, England)
• Model: PV40
• Type: Pneumatically Actuated Pipeline Valve
• Port Size: NW40 (DN40) — two NW40 centering-ring / clamping-collar ports
• Actuation: Pneumatic — top-mounted actuator with small-bore pneumatic fittings/barbs
• Body Material: Aluminum alloy, gray anodized finish
• Country of Origin: Made in Britain
• Compatible with: Edwards Diffstak series diffusion vacuum pumps (NW40 port models)
• Included: Valve unit only — no additional fittings or mounting hardware

Applications

The Edwards PV40 is a pipeline isolation valve used in diffusion pump vacuum systems, where it is typically installed between the diffusion pump outlet and the backing (roughing) pump line, or between the pump and the vacuum chamber. Pneumatically actuated valves like this one allow automatic or remotely controlled isolation of the pump from the system — important for protecting the pump and maintaining vacuum integrity during process cycles or venting events. The Diffstak pump series from Edwards High Vacuum (later BOC Edwards) was widely used in semiconductor process equipment, coating systems, electron microscopy, and general research vacuum applications from the 1970s through the 1990s. NW40 (also called KF40 or DN40) is a standardized ISO quick-flange port size, making these valves compatible with a broad range of vacuum components and fittings from Edwards and other manufacturers such as Kurt J. Lesker Company.