Fig 500L Pressure Relief Valve

Features

Pipe Connections

Screwed female inlet and outlet connections. outlet connection is one size larger than inlet connection. Threaded connections are Rp parallel to BS EN 10226-1. NPT connections are available upon request.

Testing

All valves are shell and seat tested (to confirm set pressure) before leaving the factory and all valves are supplied pre-set with a tamper proof seal. Pressure Test Certificate and Letters of Conformity available on request.

Product Extras

Available with Viton seat design
Pressure setting locked and sealed
Drain plug fitted on DN32 and above allows fitting of a pressure gauge

Fig 500L Pressure Relief Valve Dimensional Drawing

Dimensions & Weights

SIZE DN	Rp BSP Inlet	Rp BSP Outlet	A (mm)	B (mm)	C (mm)	Weight (Kg)
15	1/2″	3/4″	33	20	123	0.70
20	3/4″	1″	39	24	136	0.93
25	1″	1 1/4″	45	30	155	1.42
32	1 1/4″	1 1/2″	54	36	201	2.50
40	1 1/2″	2″	64	41	236	4.63
50	2″	2 1/2″	76	47	267	7.00
65	2 1/2″	3″	90	60	330	12.50

Materials

Ref No	Name of Part	Material
1	Leak Proof Dome	Bronze, BS EN 1982 CC491K
2	Locknut	Brass, BS EN 12164 CW609N
3	Dome ‘O’ Ring	Viton
4	Spring	Chrome Vandium Alloy Steel, BS 2803 735 A50 HS (Stainless Steel, BS 2056 302S26 Opt)
5	Label	Yellow kapton
6	Spring Cover	Bronze, BS EN 1982 CC491K
7	Piston	Brass, BS EN 12164 CW609N
8	Cover Seal	Viton
9	Seat Seal Holder	Bronze, BS EN 1982 CC491K / Brass BS EN 12164 CW602N (DZR)
10	Seat Seal	PTFE (Viton Opt)
11	Starlock Washer	Stainless Steel
12	Body	Bronze, BS EN 1982 CC491K
13	Adjusting Screw	Brass, BS EN 12164 CW609N
14	Spring Plate	Brass, BS EN 12164 CW609N
15	Spindle	Brass, BS EN 12164 CW721R
16	Seat Seal Retaining Plate	Bronze, BS EN 1982 CC491K / Brass BS EN 12164 CW602N (DZR)
17	O-Ring	Viton

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Discharge

Discharge Capabilities

The discharge capacity of a safety valve must be equal to or greater than the output of the boiler or system it is protecting. To ensure that the correct method of sizing is used, reference should be made to the relevant BS specification for the design of the boiler or system. Fig 500L capacities are tabulated below to assist selection.

Fig 500L – Air Capacity – 10% Overpressure (BS EN 4126-1)Click to View +

std. litres/sec

Set Pressure Bar	15	20	25	32	40	50	65
1.00	25	44	69	112	176	274	464
1.25	28	50	78	127	199	310	525
1.50	31	55	87	142	222	346	585
1.75	34	61	96	157	245	382	646
2.00	38	67	105	171	268	418	707
2.25	41	73	114	186	291	454	768
2.50	44	78	123	201	314	490	828
2.75	47	84	132	215	337	526	889
3.00	51	90	141	230	360	562	950
3.25	54	96	150	245	383	598	1011
3.50	57	101	159	260	406	634	1072
3.75	60	107	168	274	429	670	1132
4.00	64	113	177	289	452	706	1193
4.25	67	119	186	304	475	742	1254
4.50	70	124	195	319	498	778	1315
4.75	73	130	204	333	521	814	1375
5.00	77	136	213	348	544	850	1436
5.25	80	142	221	363	567	886	1497
5.50	83	147	230	377	590	921	1558
5.75	86	153	239	392	613	957	1618
6.00	90	159	248	407	636	993	1679
6.25	93	165	257	422	659	1029	1740
6.50	96	170	266	436	682	1065	1801
6.75	99	176	275	451	705	1101	1861
7.00	103	182	284	466	728	1137	1922
7.25	106	188	293	480	751	1173	1983
7.50	109	193	302	495	774	1209	2044
7.75	112	199	311	510	797	1245	2104
8.00	115	205	320	525	820	1281	2165
8.25	119	211	329	539	843	1317	2226
8.50	122	216	338	554	866	1353	2287
8.75	125	222	347	569	889	1389	2347
9.00	128	228	356	584	912	1425	2408
9.25	132	234	365	598	935	1461	2469
9.50	135	239	374	613	958	1497	2530
9.75	138	245	383	628	981	1533	2590
10.00	141	251	392	642	1004	1568	2651
10.25	145	257	401	657	1027	1604	2712
10.50	148	262	410	672	1050	1640	2773
10.75	151	268	419	687	1073	1676	2833
11.00	154	274	428	701	1096	1712	2894
11.25	158	280	437	716	1119	1748	2955
11.50	161	285	446	731	1142	1784	3016
11.75	164	291	455	745	1165	1820	3076
12.00	167	297	464	760	1189	1856	3137
12.25	171	303	473	775	1212	1892	3198
12.50	174	308	482	790	1235	1928	3259

Fig 500L – Water Capacity – Unvented System – 10% Overpressure Click to View +

litres/min

Set Pressure Bar	15	20	25	32	40	50	65
1.00	54	96	151	247	386	603	1019
1.25	61	108	169	276	431	674	1139
1.50	67	118	185	302	473	738	1248
1.75	72	128	199	327	511	797	1348
2.00	77	136	213	349	546	852	1441
2.25	82	145	226	370	579	904	1528
2.50	86	152	238	390	610	953	1611
2.75	90	160	250	409	640	999	1689
3.00	94	167	261	428	668	1044	1765
3.25	98	174	272	445	696	1087	1837
3.50	102	180	282	462	722	1128	1906
3.75	105	187	292	478	747	1167	1973
4.00	109	193	302	494	772	1205	2037
4.25	112	199	311	509	796	1243	2100
4.50	115	205	320	524	819	1279	2161
4.75	118	210	329	538	841	1314	2220
5.00	122	216	337	552	863	1348	2278
5.25	125	221	345	566	884	1381	2334
5.50	127	226	354	579	905	1413	2389
5.75	130	231	361	592	925	1445	2443
6.00	133	236	369	605	945	1476	2495
6.25	136	241	377	617	965	1507	2547
6.50	139	246	384	629	984	1537	2597
6.75	141	250	392	641	1003	1566	2647
7.00	144	255	399	653	1021	1595	2695
7.25	146	260	406	665	1039	1623	2743
7.50	149	264	413	676	1057	1651	2790
7.75	151	268	420	687	1074	1678	2836
8.00	154	273	426	698	1092	1705	2881
8.25	156	277	433	709	1109	1731	2926
8.50	158	281	440	720	1125	1757	2970
8.75	161	285	446	730	1142	1783	3013
9.00	163	289	452	741	1158	1808	3056
9.25	165	293	459	751	1174	1833	3098
9.50	168	297	465	761	1190	1858	3140
9.75	170	301	471	771	1205	1882	3181
10.00	172	305	477	781	1220	1906	3222
10.25	174	309	483	790	1236	1930	3262
10.50	176	312	489	800	1251	1953	3301
10.75	178	316	494	809	1265	1976	3340
11.00	180	320	500	819	1280	1999	3379
11.25	182	323	506	828	1294	2022	3417
11.50	184	327	511	837	1309	2044	3455
11.75	186	330	517	846	1323	2066	3492
12.00	188	334	522	855	1337	2088	3529
12.25	190	337	528	864	1351	2109	3566
12.50	192	341	533	873	1365	2131	3602

To convert to galls/min multiply by 0.22.

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Pressure Relief Valve

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