Pressure Relief Valves

The Diaphragm Pressure Relief Valve is an accessory valve of the metering pump. The pressure Relief Valve can discharge excess liquid in time, effectively protect pumping systems for over pressure or blockage in the pump system . The valve is simple, reliable, sensitive, and has excellent corrosion resistance.Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

Pressure Relief Valve is also called Safety Relief Valve, when the metering pump spit out side pipeline blockage, the liquid can be returned to the original medicine barrel through the pressure relief valve, do not cause the metering pump to spit out the side pressure continues to rise, destroy the metering pump and pipeline, the general pressure relief valve set pressure is usually less than the maximum working pressure of the metering pump or the system can withstand the pressure of about 1 BAR.

This series of pressure relief valve is a diaphragm valve that opens only when the fluid pressure is greater than its set pressure. The pressure relief valve should be installed in the discharge line of the pump and should be close to the pump. Setting a pulsation damper and back pressure valve between the pump outlet and the pressure relief valve can help improve the performance of the pressure relief valve. The pressure of the valve should be set when the valve is installed and the pump is running, a pressure gauge should be installed between the pump and the pressure relief valve, starting from the minimum pressure to adjust the valve’s adjustment screws until the pressure gauge reaches the desired pressure value. Turning the screw clockwise increases the set pressure and decreases counterclockwise, changing the pressure by about 8 psi per full turn.

Main Data
Model	Body Material	Size	Max Flow
VR11PT	PVC	1/4”	240L/H
VR11ST	316L	1/4”	240L/H
VR11VT	PVDF	1/4”	240L/H
VR21PT	PVC	1/2”	380L/H
VR21ST	316L	1/2”	380L/H
VR21VT	PVDF	1/2”	380L/H
VR31PT	PVC	3/4”	650L/H
VR31ST	316L	3/4”	650L/H
VR31VT	PVDF	3/4”	650L/H
VR41PT	PVC	1”	800L/H
VR41ST	316L	1”	800L/H
VR41VT	PVDF	1”	800L/H
VR51PT	PVC	1-1/4”	1200L/H
VR51ST	316L	1-1/4”	1200L/H
VR51VT	PVDF	1-1/4”	1200L/H
VR61PT	PVC	1-1/2”	2600L/H
VR61ST	316L	1-1/2”	2600L/H
VR61VT	PVDF	1-1/2”	2600L/H
VR81PT	PVC	2”	3200L/H
VR81ST	316L	2”	3200L/H
VR81VT	PVDF	2”	3200L/H

Dimensions(mm)
L	A	B	H	D1	D2
102	38	60	19	60	35
102	38	60	19	60	35
102	38	60	19	60	35
102	38	60	19	60	35
102	38	60	19	60	35
102	38	60	19	60	35
135	60	70	30	88	54
135	60	70	30	88	54
135	60	70	30	88	54
135	60	70	30	88	54
135	60	70	30	88	54
135	60	70	30	88	54
145	70	70	35	100	54
145	70	70	35	88	54
145	70	70	35	100	54
235	84	100	42	128	72
235	78	100	39	128	72
235	84	100	42	128	72
255	95	100	47.5	128	72
250	89	100	44.5	128	72
255	95	100	47.5	128	72

Body Material		PVC, PVDF, 316L Stainless Steel (SS), additional materials may be available on request
Diaphragm		PTFE+EPDM composite diaphragm
Inlet Type		NPT
Adjustable Range		1-10 bar
Valve Top		ABS/304SS
Max Temperature		Plastic 45℃, Metal 60℃