Fig 500T Combined Pressure & Temperature Relief Valve

Features

Pipe Connections

Threaded male inlet connection R (BSPT) to BS EN 10226-2. Threaded female outlet connections Rp (BSP) to BS EN 10226-1. Note: The inlet and outlet connections are equal in size and are one size larger than the bore size. The inlet is a male thread, the larger size is to allow the thermover to be fitted.

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

Pressure setting locked and sealed

Pressure Ratings & Temperature Range

Min – Max Set Pressure (bar)	Set Temperature (° C)
DN15 to DN50 1.0 to 12.5	95

Fig 500T Dimensional Drawing

Dimensions & Weights

SIZE DN	R BSPT Inlet	Rp BSP Outlet	A(mm)	B(mm)	C(mm)	D(mm)	Weight (Kg)
15	3/4″	3/4″	33	81	48	229	0.72
20	1″	1″	39	81	47	238	1.00
25	1 1/4″	1 1/4″	45	88	56	269	1.54
32	1 1/2″	1 1/2″	54	127	62	354	3.00
40	2″	2″	64	127	71	398	4.50
50	2 1/2″	2 1/2″	76	127	82	429	7.78

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	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)
20	Push Rod	Stainless Steel, BS 970 316 S31
21	Adaptor	Brass, BS EN 12164 CW602N (DZR)
22	Thermostat	Copper/Brass BS EN 12164 CW602N (DZR)

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Discharge

The discharge capacity of the safety valve must be equal to or greater than the output of the boiler or system it is protecting. Two methods of sizing are employed for combined pressure and temperature relief valves; one, based on the pressure element of the valve, the other based on the temperature element. To ensure that the correct method is used, reference should be made to the relevant BS specification to the design of the bioler or system. If in doubt, choose the method which produces the lower rating.

Fig 500T Temperature Rating Click to View +

Temperature Rating Based on kW Input
Size	15	20	25	32	40	50
kW	25	45	65	105	165	255

To convert to Btu/hr multiply by 3400.
The above discharge capabilities represent approximately 45% of the relief capability of the value, when steam at the pressure of 1 bar causes the thermostat to open the valve

Discharge Capabilities

Hot Water – Unvented System – 10% Overpressure (BS 6759) Click to View +

Fig 500T capacities are tabulated below to assist selection.

Pressure Rating kW
Pressure Bar	15	20	25	32	40	50
1.00	46	81	127	208	326	509
1.25	52	92	144	236	368	575
1.50	58	103	161	263	411	642
1.75	64	113	177	290	454	708
2.00	70	124	194	317	496	775
2.25	76	135	211	345	539	842
2.50	82	145	227	372	582	908
2.75	88	156	244	399	624	975
3.00	94	167	260	427	667	1041
3.25	100	177	277	454	710	1108
3.50	106	188	294	481	752	1175
3.75	112	199	310	508	795	1241
4.00	118	209	327	536	837	1308
4.25	124	220	344	563	880	1374
4.50	130	231	360	590	923	1441
4.75	136	241	377	617	965	1508
5.00	142	252	394	645	1008	1574
5.25	148	262	410	672	1051	1641
5.50	154	273	427	699	1093	1707
5.75	160	284	444	727	1136	1774
6.00	166	294	460	754	1179	1841
6.25	172	305	477	781	1221	1907
6.50	178	316	494	808	1264	1974
6.75	184	326	510	836	1307	2040
7.00	190	337	527	863	1349	2107
7.25	196	348	544	890	1392	2174
7.50	202	358	560	918	1435	2240
7.75	208	369	577	945	1477	2307
8.00	214	380	594	972	1520	2373
8.25	220	390	610	999	1562	2440
8.50	226	401	627	1027	1605	2507
8.75	232	412	644	1054	1648	2573
9.00	238	422	660	1081	1690	2640
9.25	244	433	677	1108	1733	2706
9.50	250	444	694	1136	1776	2773
9.75	256	454	710	1163	1818	2840
10.00	262	465	727	1190	1861	2906
10.25	268	476	744	1218	1904	2973
10.50	274	486	760	1245	1946	3039
10.75	280	497	777	1272	1989	3106
11.00	286	507	794	1299	2032	3173
11.25	292	518	810	1327	2074	3239
11.50	298	529	827	1354	2117	3306
11.75	304	539	844	1381	2160	3372
12.00	310	550	860	1409	2202	3439
12.25	316	561	877	1436	2245	3506
12.50	322	571	894	1463	2287	3572

The above discharge capacities have been calculated in accordance with BS 6759: Part 1, using a derated coefficient of discharge (Kdr) of 0.375. They represent the steam relief capacity of the pressure eliment of the valve at 10% overpressure.

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Combined Pressure & Temperature Relief Valve

Features

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Discharge

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