Control Devices ST25-1A125 Safety Relief Valve 125 Psi

Product Description

The CONTROL DEVICES ST25-1A125 is an ASME-rated safety relief valve designed to protect pressurized systems from exceeding safe operating limits. With a 1/4 inch MNPT inlet connection and a maximum working pressure of 125 psi, this valve automatically vents excess pressure to prevent equipment damage or failure. The brass body provides corrosion resistance suitable for air compressor and pneumatic system applications. A fluorocarbon seal handles a working temperature range of -15 degrees F to 250 degrees F, making it reliable across a wide range of service conditions. Licensed plumbers, pipefitters, and HVAC technicians install this valve as a primary pressure-relief safety device.

The ST25-1A125 is suited for residential and light commercial compressed air systems, pneumatic equipment, and pressure vessels where a compact 1/4 inch NPT connection is required. Its 116 CFM flow capacity handles the relief demands of small to mid-size air compressors and similar pressurized equipment. This valve is intended for installations where ASME safety standards are required by code, including equipment rooms, utility spaces, and mechanical areas serviced by licensed tradespeople.

Key Features

• ASME-rated safety relief valve for code-compliant pressure protection
• 125 psi maximum working pressure with 116 CFM relief capacity
• 1/4 inch MNPT inlet for straightforward threaded installation
• Brass body construction for corrosion resistance in air and pneumatic service
• Fluorocarbon seal rated from -15 degrees F to 250 degrees F
• Compact form factor for installations with limited clearance

Compatibility

Designed as an ASME-compliant replacement safety relief valve for pressurized systems and equipment requiring a 1/4 inch NPT connection rated to 125 psi.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or HVAC technician in accordance with applicable mechanical codes and ASME standards. Always depressurize and isolate the system completely before removing an existing relief valve or installing a new one. Apply thread sealant appropriate for the service media to the MNPT threads, and do not over-tighten, as brass fittings can be damaged by excessive torque. Verify the valve set pressure matches the equipment nameplate rating before returning the system to service.