China Pressure Relief Valve Suppliers, Manufacturers, Factory

pressure relief valve

Product Description

Feature of valve:

Structure And Purpose:
500X Pressure Discharge & Sustain Valve is used in the pipeline system to prevent of surpassing pressure or to keep the pressure of it, to reduce the water hammer’s shock after the pump is closed and also used as a water hammer remover in the large water supply system. A self cleaning filter screen is placed on the inlet of the valve’s control system, which stops the suspension grains of the bigger specific gravity and diameter from going into the system by means of the bigger specific gravity of the fluid to ensure the main valve’s water supply pressure at the upstream at the set value, and to get the system circulated smoothly without any resistance. This valve features by sensitive open-close, safety, reliability, stable motion and long duration.

Characteristics:
The body uses full passage streamline design, of a small fluid resistance and a heavy flow.this valve can be used as either a pressure releasing or holdingvalve.when used as the former,it can release the pressure surpassing the safe value set with the pilot valve and keep the pressure inside of the pipeline below the safe value to prevent system against danger due to an excessively high water pressure;while used as the latter,it can keep the upstream water supply pressure of the main valve over some set value,this is because water supply to the downstream can not be done,unless the upstream is higher than the set value,in order to make sure of he upstream water supply pressure of the main valve.

Principle:
The inlet side of the main valve is connected to the pilot valve via a control pipe.when the pressure on the said side is over the one set with the pilot valve,the pilot valve is opened to release the pressure in the upper cavity of the diaphragm and the main valve disc is opened accordingly.when the pressure of the main valve is released to the set one,the pilot valve is closed,so does the main valve.

Materials of major parts:

Name of parts	Material of parts
Body & cap	Ductile iron
Valve seat & valve disc	Brass
Valve stem	Stainless steel
Spring	Stainless steel
Surface	EPOXY
Valve sealing	EPDM/NBR

Main size:

4 inch holding pressure relief valve for water

DN (mm)	20	25	32	40	50	65	80	100	125	150	200	250	300	350	400	450	500	600	700	800
L	180	180	180	240	240	250	285	360	400	455	585	650	800	860	960	1075	1075	1230	1650	1750
A	262	262	262	280	280	284	292	330	340	350	392	442	472	532	582	682	682	762	832	932
A1	130	130	130	139	139	141	145	164	169	174	195	220	235	265	290	350	350	390	420	470
H	212	212	212	265	265	310	350	460	520	570	695	780	905	1025	1080	1135	1135	1270	1460	1640
H1	179	179	179	210	210	215	245	305	365	415	510	560	658	696	735	665	665	725	865	975
F	116	116	116	170	170	180	210	275	310	355	460	500	580	640	715	830	830	920	980	1050

Performance specification:

Normal pressure (Mpa)	Body test pressure (Mpa)	Sealing test pressure (Mpa)	Applicable medium	Applicable temperature (°C)
1.0	1.5	1.1	water	0~80
1.6	2.4	1.76
2.5	3.75	2.75