Relief Valve – 850DR

$548.81

Category:

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.

Part #  NB Cert. #  Body Material  Size 
850DR 51231 Ductile Iron Casting 60-40-18 ¾”,1”, or 1 ¼” MNPT inlet x 1 ½” FNPT outlet

#850R 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)
850-Schematic

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 850R 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.
850R
3/4”, 1”, or 1 1/4" x 1 1/2"
  Relief Valve Capacity Chart
Set or Release Pressure (PSIG)  Air SCFM 60 F 1 Atm  Air lb/min 60 F 1 Atm  Air lb/hr 60 F 1 Atm  NH3 lb/hr 60 F 1 Atm  NH3 lb/min 60 F 1 Atm  R-12 lb/hr 60 F 1 Atm  R-12 lb/min 60 F 1 Atm  R-22 lb/hr 60 F 1 Atm  R-22 lb/min 60 F 1 Atm  R-502 lb/hr 60 F 1 Atm  R-502 lb/min60 F 1 Atm 
150 449 34 2057 1577 26 4202 70 3553 59 4037 67
175 518 39 2340 1818 30 4844 81 4097 68 4655 78
200 586 44 2640 2060 34 5487 91 4641 77 5273 88
225 655 49 2940 2301 38 6130 102 5185 86 5891 98
250 724 54 3240 2542 42 6773 113 5729 95 6509 108
275 793 60 3600 2786 46 7422 124 6277 105 7132 119
300 861 65 3900 3025 50 8059 134 6816 114 7744 129
325 930 70 4200 3266 54 8702 145 7360 123 8362 139
350 999 75 4500 3509 58 9350 156 7908 132 8985 150
375 1067 81 4889 3749 62 9988 166 8448 141 9598 160
400 1136 85 5100 3990 67 10631 177 8991 150 10215 170

Additional information

Inlet Port Size

3/4", 1", 1 1/4"

Material Type

Ductile

Outlet Port Size

1 1/2"

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