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This is a NEW MKS HPS stainless steel KF-40 2-stage right angle "soft start" high vacuum valve.

Our price: $400


As received us, this valve was sealed in plastic as shown. The bag is a bit ragged from handling, with at least one tear in the plastic, but the valve has never been removed from the bag. Enough room was available to allow the protective flange caps to be removed (within the bag) for inspection of the flange surfaces; they are prisitine.

This is a two-stage valve, essentially two valves in parallel in one compact package.  The low-conductance bypass can be used to carry out a "soft" initial chamber pumpdown with reduced turbulent flow, and the main valve can then be opened for full conductance once an appropriate pressure has been obtained. This functionality is particularly desirable for processes that are sensitive to particulates.
  • MKS HPS part number V2-040-AK-225-CNVNH
  • stainless steel right angle valve
  • nominal 1-1/2" ports
  • KF-40 flanges
  • bellows sealed actuation
  • Viton bonnet seal
  • Viton poppet seal
  • pneumatic actuation (air to open, spring to close) for both the main valve and the bypass

  • 0.225" bypass orifice
  • normally closed (NC) bypass actuator
  • pneumatic port for main valve is 1/8" NPT-F
  • pneumatic port for bypass valve is 10-32 UNF (suitable push-to-connect tubing adapters are available as standard items from many sources)

  • Full details on this series of valves can be found in the Two Stage Valve Catalog (MKS web site).
Click on any picture below to view a larger, higher-resolution version.