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Variable Leak Valves

Fine Leak

 All-metal MLV series leak valves are specifically designed to control gas admission into ultrahigh vacuum systems. They are manually actuated and ideally suited for handling hot or corrosive gases commonly used in demanding research environments. The valve body is constructed of type 304 stainless steel and fitted with a knife-edge seat made of a durable stellite superalloy. MDC ultrahigh vacuum leak valves are shipped in a leak-tight condition. Valve leak rates can be adjusted down to a minimum leak of 7.5x10-8 Torr l/sec. Leak rate is controlled by relieving the pressure applied to a replaceable nickel diaphragm. Although these valves can be fully closed and rendered leak tight, doing so repeatedly will reduce the life of the nickel diaphragm and require periodic replacement.

 Standard Features
  • Adjustable leaks to 7.5x10-8 Torr l/sec
  • High temperature service to 450°C
  • Durable stellite superalloy seat
  • Replaceable nickel diaphragm seal
  • Manual actuator
  • Stainless steel construction
  • Dry film lubricated actuator
  • Del-Seal™ CF ports
Variable Leak Valves-Fine Leak
 Flanges 304ss
 Valve Body / Seat 304ss / Stellite 
 Bolts  300ss
 Gaskets, Poppet and Bonnet  Nickel
Port Fastening
 Bolt Type Socket head and silver plated screws
 Nut Type Hexagonal nuts
Leak Rate 7.5x10-3 to 7.5x10-8 Torr l/sec
Inlet Pressure 15 PSIG
Temperature Rating 450°C

 Variable Leak Valves - Fine Leak
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 Fine Leak