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Small brass relief valve with threaded inlet and outlet, compact cylindrical body, matte gold finish

Campbell

Campbell Relief Valve 3/4 x 1/2 In 75 psi Brass

SKU CH-9V3H-DNQJS

A non-adjustable brass relief valve with a 3/4-inch male NPT inlet and 1/2-inch female NPT outlet, factory set to 75 psi for liquid bypass or thermal expansion protection up to 120 degrees F

  • TypeOther
  • Non-adjustable 75 psi relief protects against over-pressure
  • Brass body and seat resist corrosion in liquid by-pass use
  • 304 stainless-steel spring maintains consistent opening pressure
  • Rated up to 120 °F for thermal expansion applications
  • ANSI/ASME B1.20.1-2013 compliant NPT threads ensure leak-free fit

Campbell 3/4 x 1/2 In Relief Valve 75 psi

This non-adjustable Campbell relief valve is designed for liquid by-pass or thermal expansion protection in residential and light commercial plumbing systems. It features a brass body with a factory-set pressure of 75 psi and a temperature rating up to 120 degrees Fahrenheit. The unit connects via a 3/4 inch MNPT inlet and a 1/2 inch FNPT outlet.

Suits systems needing fixed 75 psi brass relief

This valve suits installers needing a compact, non-adjustable brass relief device with a 75 psi factory setting for thermal expansion or by-pass duty. It is not for applications requiring an adjustable pressure setting, a test lever for manual operation, a different pressure rating, or inlet and outlet sizes other than 3/4 inch by 1/2 inch NPT.

Factory-set 75 psi pressure rating

The single specification that decides fit is the factory-set pressure of 75 psi, which cannot be altered in the field. The valve opens at this pressure to protect piping and equipment from over-pressurisation caused by thermal expansion. Verify that the system design requires exactly this non-adjustable set point before installation.

Highlights

  • Non-adjustable 75 psi relief protects against over-pressure
  • Brass body and seat resist corrosion in liquid by-pass use
  • 304 stainless-steel spring maintains consistent opening pressure
  • Rated up to 120 °F for thermal expansion applications
  • ANSI/ASME B1.20.1-2013 compliant NPT threads ensure leak-free fit

Specifications

BrandCAMPBELL
TypeOther

Questions about this item

What 3/4 inch MNPT and 1/2 inch FNPT connections does the valve need?

The valve has a 3/4 inch MNPT inlet and a 1/2 inch FNPT outlet, so it threads directly into matching pipe fittings.

How is the non-adjustable 75 psi relief valve installed, and what step is often missed?

Thread the brass body into the piping using the MNPT inlet and FNPT outlet; the step often missed is confirming the factory-set 75 psi matches the system design pressure before tightening.

Which parts may need replacement over time on a brass body with a 304 stainless steel spring?

The brass seat and the 304 stainless steel spring are the wear items; inspect them during routine maintenance and replace if leakage or pressure drift appears.

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