Fig 500 High Lift Safety 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
Padlock available (complies with M&E3)
Pressure setting locked and sealed
Drain plug fitted on DN32 and above allows fitting of a pressure gauge

NABIC Fig 500 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	120	0.53
20	3/4″	1″	39	24	132	0.76
25	1″	1 1/4″	45	30	155	1.35
32	1 1/4″	1 1/2″	54	36	201	2.35
40	1 1/2″	2″	64	41	241	4.20
50	2″	2 1/2″	76	47	267	6.80
65	2 1/2″	3″	90	60	330	12.50

Materials

Ref No	Name of Part	Material
1	Thrust Washer	Brass, BS EN 12164 CW609N
2	Grubscrew	Steel
3	Test Lever	Brass, BS EN 1982 CC754S
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	Diaphragm	Silicon Rubber
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	Lever Pin	Steel
14	Lead Seal (Not shown)	Lead
15	Adjusting Screw	Brass, BS EN 12164 CW609N
16	Spring Plate	Brass, BS EN 12164 CW609N
17	Spindle	Brass, BS EN 12164 CW721R
18	Seat Seal Retaining Plate	Bronze, BS EN 1982 CC491K / Brass BS EN 12164 CW602N (DZR)
19	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 500 capacities are tabulated below to assist selection.

Fig 500 – Air – 10% Over Pressure (BS EN 4126-1) Click to View +

std.litres/sec (Kdr=0.479)

Set Pressure Bar	15	20	25	32	40	50	65
1	34	61	95	156	244	381	644
1.25	39	69	108	177	276	431	729
1.5	43	77	120	197	308	481	813
1.75	48	85	133	217	340	531	897
2	52	93	145	238	372	581	982
2.25	57	101	158	258	404	631	1066
2.5	61	109	170	279	436	681	1150
2.75	66	117	183	299	468	730	1235
3	70	125	195	320	500	780	1319
3.25	75	133	208	340	532	830	1403
3.5	79	141	220	360	564	880	1488
3.75	84	149	233	381	596	930	1572
4	88	157	245	401	628	980	1656
4.25	93	165	258	422	659	1030	1741
4.5	97	173	270	442	691	1080	1825
4.75	102	181	283	463	723	1130	1909
5	106	189	295	483	755	1180	1994
5.25	111	197	308	504	787	1229	2078
5.5	115	205	320	524	819	1279	2163
5.75	120	213	332	544	851	1329	2247
6	124	221	345	565	883	1379	2331
6.25	129	229	357	585	915	1429	2416
6.5	133	237	370	606	947	1479	2500
6.75	138	245	382	626	979	1529	2584
7	142	253	395	647	1011	1579	2669
7.25	147	261	407	667	1043	1629	2753
7.5	151	269	420	688	1075	1679	2837
7.75	156	276	432	708	1107	1729	2922
8	160	284	445	728	1139	1778	3006
8.25	165	292	457	749	1171	1828	3090
8.5	169	300	470	769	1203	1878	3175
8.75	174	308	482	790	1235	1928	3259
9	178	316	495	810	1267	1978	3343
9.25	183	324	507	831	1299	2028	3428
9.5	187	332	520	851	1331	2078	3512
9.75	192	340	532	871	1363	2128	3597
10	196	348	545	892	1394	2178	3681
10.25	201	356	557	912	1426	2228	3765
10.5	205	364	570	933	1458	2277	3850
10.75	210	372	582	953	1490	2327	3934
11	214	380	595	974	1522	2377	4018
11.25	219	388	607	994	1554	2427	4103
11.5	223	396	620	1015	1586	2477	4187
11.75	228	404	632	1035	1618	2527	4271
12	232	412	645	1055	1650	2577	4356
12.25	237	420	657	1076	1682	2627	4440
12.5	241	428	670	1096	1714	2677	4524

To convert to ft3/min multiply by 2.1.

Fig 500 – Steam – 10% Over Pressure (BS 6759) Click to View +

Kg/hr (Kdr=0.479)

Set Pressure Bar	15	20	25	32	40	50	65
1.00	93	166	259	425	664	1037	1752
1.25	106	188	293	480	751	1172	1982
1.50	118	209	327	536	838	1308	2211
1.75	130	231	361	591	925	1444	2441
2.00	142	253	395	647	1012	1580	2670
2.25	155	274	429	703	1098	1715	2900
2.50	167	296	463	758	1185	1851	3129
2.75	179	318	497	814	1272	1987	3358
3.00	191	340	531	869	1359	2123	3588
3.25	204	361	565	925	1446	2258	3817
3.50	216	383	599	981	1533	2394	4047
3.75	228	405	633	1036	1620	2530	4276
4.00	240	426	667	1092	1707	2666	4506
4.25	253	448	701	1147	1794	2801	4735
4.50	265	470	735	1203	1881	2937	4965
4.75	277	492	769	1259	1968	3073	5194
5.00	289	513	803	1314	2055	3209	5424
5.25	302	535	837	1370	2142	3344	5653
5.50	314	557	870	1425	2229	3480	5882
5.75	326	578	904	1481	2315	3616	6112
6.00	338	600	938	1537	2402	3752	6341
6.25	351	622	972	1592	2489	3887	6571
6.50	363	644	1006	1648	2576	4023	6800
6.75	375	665	1040	1703	2663	4159	7030
7.00	387	687	1074	1759	2750	4295	7259
7.25	399	709	1108	1815	2837	4430	7489
7.50	412	730	1142	1870	2924	4566	7718
7.75	424	752	1176	1926	3011	4702	7948
8.00	436	774	1210	1981	3098	4838	8177
8.25	448	796	1244	2037	3185	4973	8407
8.50	461	817	1278	2093	3272	5109	8636
8.75	473	839	1312	2148	3359	5245	8865
9.00	485	861	1346	2204	3446	5381	9095
9.25	497	882	1380	2259	3532	5516	9324
9.50	510	904	1414	2315	3619	5652	9554
9.75	522	926	1448	2371	3706	5788	9783
10.00	534	948	1482	2426	3793	5924	10013
10.25	546	969	1516	2482	3880	6059	10242
10.50	559	991	1550	2537	3967	6195	10472
10.75	571	1013	1584	2593	4054	6331	10701
11.00	583	1034	1618	2649	4141	6467	10931
11.25	595	1056	1651	2704	4228	6603	11160
11.50	608	1078	1685	2760	4315	6738	11389
11.75	620	1100	1719	2815	4402	6874	11619
12.00	632	1121	1753	2871	4489	7010	11848
12.25	644	1143	1787	2927	4576	7146	12078
12.50	657	1165	1821	2982	4663	7281	12307

Fig 500 – Water – Unvented System – 10% Over Pressure (BS EN 4126-1) Click to View +

kg/min water (Kdr=0.479)

Set Pressure Bar	15	20	25	32	40	50	65
1.00	75	134	209	343	536	837	1414
1.25	84	150	234	383	599	936	1581
1.50	92	164	256	420	656	1025	1732
1.75	100	177	277	453	709	1107	1871
2.00	107	189	296	485	758	1183	2000
2.25	113	201	314	514	804	1255	2122
2.50	119	212	331	542	847	1323	2236
2.75	125	222	347	568	889	1388	2346
3.00	131	232	363	594	928	1449	2450
3.25	136	241	377	618	966	1509	2550
3.50	141	250	392	641	1002	1566	2646
3.75	146	259	405	664	1038	1620	2739
4.00	151	268	419	685	1072	1674	2829
4.25	156	276	432	707	1105	1725	2916
4.50	160	284	444	727	1137	1775	3000
4.75	164	292	456	747	1168	1824	3083
5.00	169	299	468	766	1198	1871	3163
5.25	173	307	480	785	1228	1917	3241
5.50	177	314	491	804	1257	1962	3317
5.75	181	321	502	822	1285	2007	3392
6.00	185	328	513	840	1313	2050	3465
6.25	189	335	523	857	1340	2092	3536
6.50	192	341	534	874	1366	2133	3606
6.75	196	348	544	890	1392	2174	3675
7.00	200	354	554	907	1418	2214	3742
7.25	203	360	564	923	1443	2253	3808
7.50	207	367	573	939	1467	2292	3874
7.75	210	373	583	954	1492	2330	3938
8.00	213	379	592	969	1516	2367	4001
8.25	217	384	601	984	1539	2404	4063
8.50	220	390	610	999	1562	2440	4124
8.75	223	396	619	1014	1585	2475	4184
9.00	226	402	628	1028	1608	2510	4243
9.25	229	407	637	1042	1630	2545	4302
9.50	233	413	645	1056	1652	2579	4360
9.75	236	418	654	1070	1673	2613	4417
10.00	239	423	662	1084	1695	2646	4473
10.25	242	429	670	1097	1716	2679	4528
10.50	244	434	678	1111	1736	2712	4583
10.75	247	439	686	1124	1757	2744	4638
11.00	250	444	694	1137	1777	2775	4691
11.25	253	449	702	1150	1797	2807	4744
11.50	256	454	710	1162	1817	2838	4797
11.75	259	459	717	1175	1837	2868	4848
12.00	261	464	725	1187	1856	2899	4900
12.25	264	468	733	1200	1875	2929	4951
12.50	267	473	740	1212	1895	2959	5001

In the above tables, discharge capacities have been calculated in accordance with BS EN 4126-1 & BS 6759, using a derated coefficient of discharge (Kdr) 0.479, approved by AOTC.

Fig 500 – Hot Water – Unvented System – 10% Over Pressure (BS EN 4126-1) Click to View +

kW (Kdr=0.479)

Set Pressure Bar	15	20	25	32	40	50	65
1.00	59	104	162	266	416	650	1098
1.25	66	118	184	301	470	735	1242
1.50	74	131	205	336	525	820	1386
1.75	82	145	226	371	579	905	1529
2.00	89	158	248	405	634	990	1673
2.25	97	172	269	440	688	1075	1817
2.50	105	186	290	475	743	1160	1961
2.75	112	199	311	510	797	1245	2105
3.00	120	213	333	545	852	1330	2248
3.25	128	226	354	580	906	1415	2392
3.50	135	240	375	615	961	1500	2536
3.75	143	254	397	649	1015	1585	2680
4.00	151	267	418	684	1070	1670	2824
4.25	158	281	439	719	1124	1756	2967
4.50	166	294	460	754	1179	1841	3111
4.75	174	308	482	789	1233	1926	3255
5.00	181	322	503	824	1288	2011	3399
5.25	189	335	524	858	1342	2096	3543
5.50	197	349	546	893	1397	2181	3686
5.75	204	362	567	928	1451	2266	3830
6.00	212	376	588	963	1505	2351	3974
6.25	220	390	609	998	1560	2436	4118
6.50	227	403	631	1033	1614	2521	4262
6.75	235	417	652	1067	1669	2606	4405
7.00	243	431	673	1102	1723	2691	4549
7.25	250	444	694	1137	1778	2776	4693
7.50	258	458	716	1172	1832	2861	4837
7.75	266	471	737	1207	1887	2947	4980
8.00	273	485	758	1242	1941	3032	5124
8.25	281	499	780	1277	1996	3117	5268
8.50	289	512	801	1311	2050	3202	5412
8.75	296	526	822	1346	2105	3287	5556
9.00	304	539	843	1381	2159	3372	5699
9.25	312	553	865	1416	2214	3457	5843
9.50	319	567	886	1451	2268	3542	5987
9.75	327	580	907	1486	2323	3627	6131
10.00	335	594	929	1520	2377	3712	6275
10.25	342	607	950	1555	2432	3797	6418
10.50	350	621	971	1590	2486	3882	6562
10.75	358	635	992	1625	2541	3967	6706
11.00	365	648	1014	1660	2595	4052	6850
11.25	373	662	1035	1695	2649	4138	6994
11.50	381	675	1056	1729	2704	4223	7137
11.75	388	689	1077	1764	2758	4308	7281
12.00	396	703	1099	1799	2813	4393	7425
12.25	404	716	1120	1834	2867	4478	7569
12.50	411	730	1141	1869	2922	4563	7713

To convert to Btu/hr multiply by 3,400
The capacities tabulated are for unvented (pressurised or sealed) heating systems.
For vented systems we generally recommend the use of Fig 542 Safety Relief Valves.
Fig 500 Safety Valves can be used for high output systems where its greater discharge capacity is advantageous.
For unvented hot water supply systems, Fig 500T Combined Pressure & Temperature Relief Valves should be used.

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High Lift Safety Valve

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