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Brass 1/4 inch NPT safety relief valve, gold finish, compact cylindrical body with threaded base and domed cap

Brass 1/4" NPT Hard Seat Safety Relief Valve 25 PSI 30 SCFM

SKU CH-1S1K-RJV2A

Brass safety relief valve preset at 25 PSI with 30 SCFM flow, metal-to-metal hard seat rated from -65 to 400 °F

  • Preset at 25 PSI for reliable over-pressure protection
  • 30 SCFM flow capacity handles compressed air and gas discharge
  • Made in the USA with ASTM B16 brass body and stainless internals
  • Operates from -65 °F to 400 °F for extreme-temperature service
  • ASME code certified with 1/4" NPT thread measuring .540" OD

Brass safety valve for compressed-air systems

This 1/4" NPT brass relief valve is preset at 25 PSI with a certified flow rate of 30 SCFM. It protects unfired pressure vessels and compressed-air or gas systems from over-pressure conditions. The hard-seat design uses a metal-to-metal seal for corrosive or high-temperature service. It is manufactured in the USA and certified to ASME Code specifications.

Non-adjustable preset replaces adjustable

The valve is not adjustable and opens at the factory-set 25 PSI, with a set-pressure tolerance of +2 psig up to and including 70 psig. It replaces adjustable relief valves or lower-flow models when a fixed, code-compliant setting is required. The jump is worth it when the system demands a tamper-proof, ASME-certified discharge capacity of 30 SCFM at the specified pressure. Buyers who need field-adjustable pressure settings or a different flow capacity cannot use this valve.

Sustained operation from -65 °F to 400 °F

The operating temperature range spans -65 degrees Fahrenheit to 400 degrees Fahrenheit, allowing continuous service in extreme environments. Construction uses ASTM B16 brass for the seat, cap and piston, a 302 stainless-steel spring and a 440 stainless-steel sealing ball. The hard-seat design maintains sealing integrity over long periods without the degradation common to soft-seat alternatives. The 1/4" NPT thread measures .540" outside diameter for correct fitting selection.

Highlights

  • Preset at 25 PSI for reliable over-pressure protection
  • 30 SCFM flow capacity handles compressed air and gas discharge
  • Made in the USA with ASTM B16 brass body and stainless internals
  • Operates from -65 °F to 400 °F for extreme-temperature service
  • ASME code certified with 1/4" NPT thread measuring .540" OD

Specifications

BrandPRO-EDGE INDUSTRIAL PNEUMATICS AND CONTROLS

Questions about this item

What size NPT thread does the 1/4" valve need for mounting?

The 1/4" NPT thread measures 0.540" outside diameter; cut or tap the female port to match that dimension.

How do I install the preset 25 PSI valve without changing its setting?

Thread the brass body into the 1/4" NPT port using a wrench on the hex flats only; do not adjust the cap because the valve is factory-set at 25 PSI and not adjustable.

When should the stainless steel ball and spring be inspected or replaced?

Inspect the 440 stainless ball and 302 stainless spring at each system test or at least annually; replace if the ball shows pitting or the spring has taken a permanent set.

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