ASME Series 174A-75 Water Pressure Relief Valve 1-1/4 Inch For Boiler And Hot Water Systems, Heavy-Duty No-Nonsense Safety Valve To Prevent Overpressure In Domestic Water Heaters
UPC:
✔️ 1-1/4 in valve, bronze body, NPT, 30 to 150 psi, BTU/hr 650k to 14.37M
ASME Series 174A-75 water pressure relief valves protect hot water boilers and domestic water heaters from dangerous overpressure by venting when the set pressure is exceeded. This 1-1/4 in valve is designed for emergency safety relief in hot water heating systems and is intended to prevent water damage from overpressure scenarios.
✅ Bronze body with female NPT inlet and female NPT outlet (drain connections).
✅ Standard 30 psi setting with 30 to 150 psi range in 5 psi increments; rated BTU/hr 650k to 14.37M.
✅ 3/4 to 2 in (20 to 50 mm) seat located above drain; water cannot be trapped and sediment cannot foul seat.
✅ Non-mechanical seat-to-disc alignment prevents sticking or freezing; high-temperature sealing insulates spring parts from water during relief.
✅ Designed for emergency safety relief, not as an operating control.
💡 What is a water pressure relief valve used for in residential boilers and hot water systems?
This handy safety valve vents excess pressure from boilers and domestic hot water systems.
- Protects boilers and hot water heaters by venting excess pressure at the set point (30 to 150 psi).- Bronze body with female NPT inlet and outlet; stainless steel spring provides durability.
- Above-drain seat design reduces water trapping and sediment fouling.
- Not for use as an operating control; it's an emergency safety relief device.
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