Spence 31/41 Safety Relief Valves
Spence 31/41 41A Flanged Cast Iron
Safety Relief Valve
Figure 31
Figure 31 is a safety valve for over pressure protection of steam boilers operating up to 250 psi. It is rated up to 250 psi and 450°F saturated steam. Figure 31 safety valves meet ASME code, Section I.
Figure 41
Figure 41 is a safety relief valve for steam service on unfired pressure vessels. It is also used on accumulators, cleaners, and distillers. Figure 41 safety relief valves are rated up to 250 psi and 450°F of saturated steam and meet ASME code, Section VIII.
Figure 41A
Figure 41A is a safety relief valve for air, gas and vapors. It is used on compressors, receivers, burners, dryers and other piping systems. Figure 41A safety relief valves are rated up to 300 psi and 450°F and meet ASME code, Section VIII.
Features
Figure 31, 41, and 41A safety valves have two piece bodies and enclosed springs. Their rugged construction and two ring control make them extremely dependable in terms of pop action, seat tightness and repeatablility. The lifting lever permits manual valve opening (testing) with little force required on the lever when system pressure is at 75% of the valve's set pressure or higher.
Figure 31, 41, and 41A safety valves are approved and registered in every Province in Canada in accordance with C.S.A B-51 under C.R.N.#0G1893.5C.
All Figure 31, 41, and 41A safety valves are Cast Iron with Bronze Trim.
125# flange and nipple are available on outlet of threaded valves.
| Threaded x threaded connection | |
| (J) | 1-1/2" x 2-1/2" |
| (K) | 2" x 3" | (L) | 2-1/2" x 4" | (M) | 3" x 4" |
| Flanged (250#) x threaded connection | |
| (J) | 1-1/2" x 2-1/2" | (J,K) | 2" x 3" | (K) | 2-1/2" x 3" | (L) | 2-1/2" x 4" | (L,M) | 3" x 3", 3" x 4" |
| Flanged (250#) x flanged (125#) | |
| (N,P) | 4" x 6" | (Q,R) | 6" x 8" |
Figure 31/41 41A Flanged Safety Valve
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