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Vendor:CONTINENTAL NH3Continental NH3 - A-417-AB - 1-1/4" Safety Relief Valve - 250 p.s.i
Regular price $274.69 USDSale price $274.69 USD Regular priceUnit price per$249.59 USD -
Up to 6% offVendor:CONTINENTAL NH3Continental NH3 - A-402-VA - 3/4" Safety Relief Valve - 250 p.s.i
Regular price $58.36 USDSale price $58.36 USD Regular priceUnit price per$62.25 USDSAVE $3.89
Frequently Asked Question
An NH3 safety relief valve is a pressure-activated device designed to protect Anhydrous Ammonia tanks and lines from dangerous over-pressurization. These relief valves open automatically when the system reaches its set pressure, preventing equipment damage, product loss, and safety risks. They are required on ASME tanks and follow standards outlined in NFPA 58 and the ASME Boiler and Pressure Vessel Code.
Most pressure ammonia relief valves used in NH₃ service should be replaced every 5 years or sooner if exposed to corrosion, damage, or if they have discharged. Regular replacement helps maintain safe operation and ensures compatibility with your tank’s pressure range and gas types.
A safety relief valve protects tanks and vessels from high internal pressure, while a hydrostatic relief valve (sometimes called a hydrostatic relief) protects liquid-filled piping from pressure increases caused by thermal expansion. Both are critical relief devices, but they serve different points in the system.
A vapor relief valve is used on vapor lines and vapor-only systems to maintain safe operating pressure without releasing liquid ammonia. These Vapor Relief Valves are commonly installed in transfer systems, storage sites, and bulk storage applications.
Relief valves are offered in multiple port options such as 1/4" MPT, 3/4", or 1-1/4". Your required port size (or port size A) depends on tank design, code requirements, and flow capacity needs. Always match the valve to your tank manufacturer’s specifications or consult our technical support team.
Currently, we stock Continental NH₃, a leading manufacturer of NH3 (Anhydrous Ammonia) safety relief valves.
Some pressure relief valves are designed for both Anhydrous Ammonia and industrial refrigeration system use, depending on body material (such as stainless steel) and seat type (e.g., synthetic rubber seat, resilient seat disc). Always verify compatibility before installation.
You may also consider replacing related components such as angle valves, ball valves, bleeder valves, needle valves, dip tubes, and gaskets to ensure leak-free operation. For large installations, a relief valve manifold may be required.
The required max PSI and set pressure depend on your tank rating, service environment, and system configuration. Relief valves for NH₃ commonly use a 250 PSI setting, but always confirm with your equipment’s Standard Operating Procedures and tank markings.
Yes. Properly functioning relief valves reduce accidental releases that contribute to greenhouse gas emissions, air pollution, and unnecessary product loss. Using the correct valve and regularly maintaining it supports environmental sustainability and overall system safety.