This Diaphragm Type Pressure Relief Sustaining Valve is mainly used in pipeline system in the field of high-rises,mines,factories,pharmaceuticals and foodstuff etc. , functioned to reduce pressure. When the Water pressure exceeds the setting pressure of this Relief valve, the relief valve will open automatically to relief pressure quickly so as to protect the pipeline from being damaged. This valve can also be used as Pressure Sustaining Valve to ensure the upper stream water supply pressure.

Pressure Grade:PN10(Range of Adjustment 0.1~0.8Mpa)
PN16(Range of Adjustment0.2~1.4Mpa)
PN25(Range of Adjustment0.3~2.0Mpa)

Valve Body	Connecting Mode	Strength Test	Seal Test	Applicable Temperature	Applicable Medium
Y- type /Double Chamber	Flange Connection	1.5 Times of Nominal Pressure	1.1Times of Nominal Pressure	≤80ºC	Water and Oil

Main Parts and Material

No	Parts Name	Material
1	Bonnet	CI/DCI/CS/SS
2	Spring	Spring Steel/SS
3	Diaphragm Gland	DCI
4	DiaphragmStem	NBR
5	Stem	2CR13
6	Disc	DCI
7	Sealing Gasket	NBR
8	Gasket Gland	DCI
9	Seat	SS
10	Body	CI/DCI/CS/SS

Main External Dimension

DN	L	H	D（mm）			D1（mm）			B（mm）
DN	mm	mm	PN1.0	PN1.6	PN2.5	PN1.0	PN1.6	PN2.5	Mpa1.0	Mpa1.6	Mpa2.5
40	203	300	165	165	165	125	125	125	4-18	4-18	4-18
50	203	300	165	165	165	125	125	125	4-18	4-18	4-18
65	216	337	185	185	185	145	145	145	4-18	4-18	8-18
80	248	467	200	200	200	160	160	160	8-18	8-18	8-18
100	283	520	220	220	235	180	180	190	8-18	8-18	8-22
125	330	580	250	250	270	210	210	220	8-18	8-18	8-22
150	356	640	285	285	300	240	240	250	8-22	8-22	8-26
200	444	778	340	340	360	295	295	310	8-22	12-22	8-26
250	533	889	395	405	425	350	355	370	12-22	12-26	12-26
300	600	1010	445	460	485	400	410	430	12-22	12-26	12-30
350	622	1037	505	520	555	460	470	490	16-22	16-26	16-33
400	698	1264	565	580	620	515	525	550	16-26	16-30	16-36
450	775	1294	615	640	670	565	585	600	20-26	20-30	20-36
500	811	1324	670	715	730	620	650	660	20-26	20-33	20-36
600	900	1600	780	840		725	770		20-30	20-36
700	980	1750	895	910		840	840		24-30	24-36
800	1100	1900	1015	1025		950	950		24-33	24-39
900	1220	2100	1115			1050			28-33
1000	1320	2400	1230			1160			28-36

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