Name: Relief Valve - 812
SKU: 221
Availability: InStock

Description

Part #	NB Cert. #	Body Material	Wt (lbs)	Size
812	51174	Ductile Iron Casting 60- 40-18	3.3	½” FNPT inlet x 1” FNPT outlet

Design Features
National Board Certification #: 51174 Set Pressure Range: 75-400 PSI in 25 PSI increments. Special Settings can be made at no extra charge and typically takes 1-2 extra days; Each valve undergoes 3 separate test sequences for set pressures and seals, and then are lock-wired for security.	All Cyrus Shank relief valves are manufactured in accordance with ASME Boiler and Pressure Vessel Code Section VIII Division I and stamped with the ASME Certification Mark with UV Designator. All Cyrus Shank relief valve capacities are certified by the National Board of Boiler and Pressure Vessel Inspectors and stamped with the NB Certification Mark.

812 Series Capacity Chart Slope = 1.339 SCFM/PSIA Standard Conditions [60 ˚F, 1 Atm]
Set Pressure (PSIG)	Air SCFM	Air lb/min	Air lb/hr	NH3 lb/min	NH3 lb/hr	R-22 lb/min	R-22 lb/hr	R-290 lb/min	R-290 lb/hr	R-404A lb/min	R-404A lb/hr
75	130.2	9.9	596.1	7.6	457.0	17.2	1029.9	12.3	735.5	18.2	1094.2
100	167.0	12.7	764.8	9.8	586.3	22.0	1321.3	15.7	943.6	23.4	1403.7
125	203.8	15.6	933.4	11.9	715.6	26.9	1612.7	19.2	1151.6	28.6	1713.3
150	240.6	18.4	1102.1	14.1	845.0	31.7	1904.0	22.7	1359.7	33.7	2022.8
175	277.4	21.2	1270.7	16.2	974.3	36.6	2195.4	26.1	1567.8	38.9	2332.4
200	314.3	24.0	1439.4	18.4	1103.6	41.4	2486.8	29.6	1775.9	44.0	2642.0
225	351.1	26.8	1608.0	20.5	1232.9	46.3	2778.2	33.1	1984.0	49.2	2951.5
250	387.9	29.6	1776.7	22.7	1362.2	51.2	3069.6	36.5	2192.1	54.4	3261.1
275	424.7	32.4	1945.3	24.9	1491.5	56.0	3360.9	40.0	2400.2	59.5	3570.7
300	461.6	35.2	2114.0	27.0	1620.8	60.9	3652.3	43.5	2608.2	64.7	3880.2
325	498.4	38.0	2282.6	29.2	1750.1	65.7	3943.7	46.9	2816.3	69.8	4189.8
350	535.2	40.9	2451.3	31.3	1879.4	70.6	4235.1	50.4	3024.4	75.0	4499.3
375	572.0	43.7	2619.9	33.5	2008.7	75.4	4526.5	53.9	3232.5	80.1	4808.9
400	608.8	46.5	2788.6	35.6	2138.0	80.3	4817.9	57.3	3440.6	85.3	5118.5

Additional information

Inlet Port Size	1/2"
Outlet Port Size	1"
Material Type	Ductile
Assembly Options	Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve