Self-acting Differential PressureBypass Valve-Water conservancy control valve series-水利控制阀厂家-上海冠环阀门制造有限公司

Product overview

The 500X pressure relief/pressure sustaining valve is composed of a main valve, a pressure relief/pressure sustaining pilot valve needle valve, a ball valve, a micro filter and a pressure gauge to form a hydraulic control takeover system. Using hydraulic automatic operation, it can be used as a pressure relief valve and a pressure sustaining valve. When used as a pressure relief valve, it can maintain the water supply pressure below the set safety value; when used as a pressure sustaining valve, it can maintain the upstream water pressure of the main valve above the set value and maintain the upstream water supply pressure of the main valve.

Working principle

1. As a pressure relief valve: when the pressure relief/pressure sustaining pilot valve is adjusted to the pressure relief state, the water flows to the outlet through the needle valve, the main valve control room, the ball valve A, the pressure relief/pressure sustaining pilot valve, and the ball valve B. The main valve is open. When the inlet pressure exceeds the safety value set by the pressure relief/pressure sustaining pilot valve, the pressure relief pilot valve will automatically open, and part of the water will be released through the ball valve C to relieve the pipeline pressure. When the pressure returns to a safe value, the pressure relief valve closes automatically. When used as a pressure relief valve, each ball valve is normally open.

2. As a pressure sustaining valve: when the pressure relief/pressure sustaining pilot valve is adjusted to the pressure sustaining state, as long as the inlet water pressure of the main valve is lower than the set value of the pilot valve, the pilot valve will be closed. The main control room is boosted and the main valve is closed. When the upstream water supply pressure of the main valve exceeds the set pressure of the pilot valve, the pressure-sustaining pilot valve can be opened, the water in the control room is discharged to the outlet through the ball valve, the pressure-reducing main valve of the control room is opened, and the water supply starts, that is, the upstream water pressure is maintained. When used as a pressure sustaining valve, the ball valve C is normally closed or replaced with a plug.

The main technical parameters

Nominal pressure (Mpa)	Shell test pressure (MPa)	Sealing test pressure (MPa)	Applicable media	Medium temperature (℃)
1.0	1.5	1.1	Water	0-80
1.6	2.4	1.76
2.5	3.75	2.75

Main part material

Part Name	Part material
Body Bonnet	WCB
Seat Disc	Copper alloy
Seal O-ring	Nitrile rubber
Stem	2Cr13
Spring	50CrVA
Needle valve	Copper alloy
Ball	Copper alloy
Pressure relief/pressure sustaining pilot valve	Copper alloy
Micro filter	Stainless steel

Connection size

DN	20	25	32	40	50	65	80	100	125	150	200	250	300	350	400	450
L	150	160	180	200	203	216	241	292	330	356	495	622	698	787	914	978
H1	463	463	463	516	516	520	537	596	653	709	805	855	953	990	1030	1030
H	557	557	557	610	610	625	642	750	808	864	1135	1185	1325	1385	1445	1445