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Brass air safety valve with 1/4 inch NPT inlet and soft silicone seat

Cdi Control Devices

Cdi Control Devices ST25-1A150 Air Safety Valve 1/4 in 150 psi

SKU CH-DY0X-3T4M3

A 1/4 in NPT brass air safety valve preset at 150 psi with a soft silicone seat rated for 136 cfm and 250 °F

  • Product typeTarps
  • Soft-seat design prevents leakage at 150 psi setting
  • 136 cfm rated flow meets compressor demand
  • Brass body with silicone seals handles 250 °F
  • Vibra Seal thread coating resists vibration loosening
  • ASME compliant for small air compressor systems

Safety valve for small compressors

The Cdi Control Devices ST25-1A150 is a preset air safety valve rated at 150 psi for small air compressor systems. It uses a soft-seat design with a resilient silicone elastomer poppet and music wire spring to relieve excess pressure. The valve carries ASME certification and fits a 1/4 inch male NPT inlet.

Flow capacity and temperature headroom

Rated at 136 cfm at the set pressure, the valve handles the discharge of typical small compressors without chatter. The brass body and silicone seals are rated for continuous service up to 250 degrees Fahrenheit. Systems demanding higher flow or pressure settings will exceed this valve's certified limits.

Brass construction with thread sealant

A brass body, brass seat and silicone O-ring resist corrosion from moisture in compressed air lines. The male NPT threads come coated with Vibra Seal coating to resist vibration loosening and provide a leak-tight seal without tape. The soft-seat silicone poppet ensures positive reseating after each relief cycle.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 96% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameCdi Control Devices
Product typeTarps

Questions about this item

Will the 1/4 in NPT inlet thread directly into the brass fittings on my existing compressor tank?

Yes, the valve has a 1/4 in male NPT inlet with Vibra Seal thread coating that threads into standard female NPT ports on compressor tanks and manifolds.

How can I verify the valve is relieving at the correct 150 psi setting after installation?

Pressurise the system and watch the tank gauge; the valve should pop open at 150 psi and reseat when pressure drops, confirming the ASME-rated set point.

Does the package include any pipe sealant or adapters, or must I buy them separately?

The valve comes with Vibra Seal thread coating pre-applied to the 1/4 in NPT inlet, so no additional sealant or adapters are required for standard connections.

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