Relief Valve – 851AR

Description

This reduced capacity relief valve has been designed for use in large-sized pressure vessels. The ASME certified
slope of 2.5 yields, for example, a capacity of 54 lbs per minute of air @ 250# set pressure.

#851R safety relief valve can be mounted on the following manifolds:

• #850 MW- ¾” (for ¾” MNPT)
• #850 MW- 1” (for 1” MNPT)
• #875 M- (for 1” MNPT)
• #876 M- (for 1” MNPT)
• #900 MW- 1 ¼” (for 1 ¼” MNPT)
• #901 M- (for 1 ¼” MNPT)

Additional Information

• All upper and lower seats are constructed from 304 stainless steel to prevent corrosion and embedded with a Teflon ring.
• All springs are stainless steel.
• All relief valves come with an installation tag and cable tie.
• Each valve’s identification tag has the 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 851R series of relief valves is 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.