Relief Valve – 903D

Description

This high capacity relief valve has been designed for use in large-sized pressure vessels. The ASME certified
slope of 15.18 yields, for example, a capacity of 335.93 lbs per minute of air @ 250# set pressure.

#903 safety relief valve can be mounted on the following manifolds:

• #900 MW- 1 ¼” (for 1 ¼” MNPT)
• #901 M- (for 1 ¼” MNPT)
• #900 MW- 1 1/2” (for 1 1/2” MNPT)
• #903 M- (for 1 ¼” MNPT)

Additional Information

• Can be used for ammonia.
• Very accurate lift off and blow down make it ideal for Freon use.
• Can be mounted on a dual manifold with a center distance as low as 5”, making it a possible substitute for the Frick AF valve.
• Has a 3” MNPT thread on the outlet which meets the ASHRAE Addendum 15c-2000 code.
• All upper and lower seats are constructed from 304 stainless steel to prevent corrosion.
• Sealing surface is encapsulated Teflon.
• All springs are stainless steel.
• Each valve carries required information of catalog number, month and year of manufacture with lot number, set pressure, inlet pipe size, and capacity for AIR in units of SCFM.
• Each valve undergoes 3 separate test sequences to verify quality and set pressure, and then is sealed for security.
• The 903 relief valves are available in set pressures from 150 to 400 psi. All relief valve common set pressures are in stock. Special settings can be made up at no extra charge and usually take 1 to 2 days.
• All Shank Relief Valves are manufactured in accordance with ASME Quality Control Procedures and stamped with the ASME Certification Mark with UV designator.
• They are certified by the National Board of Boiler & Pressure Vessel Inspectors. They are also certified in Canada.