4500 Series Bellows Sealed Valves

Hoke 4500 Series Bellows Sealed Valve

This miniature valve can be manually or remotely operated. Operating temperatures range from −20° to +250° F [−29° to +120° C], while operating pressures range from high vacuum to 300 psig. Available in brass and Monel®, this valve can be used as a stop valve in a calibrated leak tester, and in labs where leak-tight service is necessary.

Typical Applications

  • Stop valve in calibrated leak tester
  • High vacuum work
  • Laboratory environments demanding leak-tight service

Features & Benefits

  • Protective handle limits escape of process fluid if bellows ruptures
  • Bellows assembly is replaced by removing cap handle and retaining nut
  • PCTFE seat is fully encapsulated to prevent cold flow
  • Bellows is sealed to body with a PCTFE gasket
  • Bellows and stem are one-piece assembly
  • Available with female NPT or silver-soldered copper tube extensions
  • One of the smallest valve types and capacities available
  • Air-to-open or air-to-close operators for remote actuation are available
  • Valve may be base-mounted
  • Special High Tolerance NPT Thread

Technical Data

Maximum Operating Pressure 10−5 torr to 300 psig
Temperature Range −20° F to +250° F [−29° C to +120° C]
Orifice Size 0.156 (model 4551Q6M – 0.281 orifice)
Cv Factor 0.70 maximum
Internal Volume 0.08 cubic inches




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