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

Show entries

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

Showing 1 to 10 of 47 entries

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

litres/min

Show entries

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

Showing 1 to 10 of 47 entries

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To convert to galls/min multiply by 0.22.

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Pressure Relief Valve

Features

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Discharge

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