50-48 & 650-48 Back Pressure and Check Valve

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Engineering Data Sheet E5048

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The Cla-Val Model 50-48 Back Pressure and Check Valve is a hydaulically-operated, diaphragm actuated, globe or angle pattern valve. It is available in various materials and full range of sizes. It consists of three major components: body, diaphragm assembly and cover. The diaphragm assembly is the only moving part. The rugged simplicity of design and packless construction assure a long life dependable, trouble-free operation. Should the diaphragm become damaged the valve will fully open.

The 50-48 Back Pressure and Check Valve is used in many types of piping systems requiring back pressure and relief operations.

Advantages include:
  • Opens rapidly for maximum relief protection
  • Maintains constant upstream pressure to close limits, and  maintains preselected pressure during periods of low demand
  • Controls surge created by the starting of a pump
  • Modulates to maintain constant back pressure
  • No packing glands assure leak-proof service
  • No lubrication required
  • Tight sealing single seat
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