GAG Series Back Pressure Valve 1
GAG Series Back Pressure Valve 2
GAG Series Back Pressure Valve 3
GAG Series Back Pressure Valve 1
GAG Series Back Pressure Valve 2
GAG Series Back Pressure Valve 3

GAG Series Back Pressure Valve

The Diaphragm Back Pressure Valve is an accessory valve of the metering pump. The back pressure valve can provide the system with a pressure of 0-3bar to meet the minimum working pressure requirements of the metering pump, ensure flow accuracy, and have an anti-siphon function. The valve is simple, reliable, sensitive, and has excellent corrosion resistance.Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

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    Place of Origin
    CHINA
    Product Name
    Diaphragm Back Pressure Valve

    Metering pump and positive displacement pumps will have excessive delivery when working under low pressure.In order to prevent similar problems, a back pressure of at least 0.7 Bar must be at the inlet and outlet of the metering pump.This can be achieved by installing a back pressure valve in the outlet pipe of the metering pump.

     

    Function

    1. Provide pressure difference for the pipes at both ends of the back pressure valve

    2. It can be used as a safety valve in systems where the requirements are not very strict.

    3. Used in conjunction with a pulsation damper to reduce the harm of water hammer to the system, reduce the peak value of flow rate fluctuations, and protect pipelines, elbows, and joints from pressure fluctuations.

    4. Create a good working environment for metering pumps and improve pump performance.

     

    Operational Principle

    The back pressure valve works by the elastic force of a spring. When the system pressure is lower than the set pressure, the diaphragm will block the pipeline under the action of the spring force; when the system pressure is greater than the set pressure, the diaphragm compresses the spring, the pipeline is connected, and the liquid passes through the back pressure valve.

     

    Use of back pressure valve

    In the outlet pipeline, the back pressure valve should be used at the same time as the pulsation damper, and the pulsation damper should be used to absorb the flow peak between the pump and the back pressure valve. Without the pulsation damper, the back pressure valve will open and close quickly with each pump stroke. When there is a pulsation damper, the back pressure valve will oscillate in the half-open and half-closed positions, so the pulsation damper can reduce the wear rate of the back pressure valve.

    For large flow pumps, and the outlet pipe is long and thin, the installation position of the back pressure valve should be close to the filling point to reduce the tendency of siphoning.

    When transporting media containing suspended solids, a three-way (or four-way) with a pipe plug should be installed at the inlet end of the back pressure valve so that the pipeline can be cleaned without disassembly.

    Back pressure valve is only a kind of pipeline component, and it can only be used in conjunction with other pipeline components (such as pulsation damper, safety valve, check valve, stop valve) in order to exert its maximum effect.

     

    Selection Guide

    Adjustable range 0-3bar

    Anti-siphon function

    Vulcanized PTFE/EPDM diaphragm

    Body Material:PVC、PVDF、SS316L

    Sizes from ¼” to 2” depending on model

     

    Notice

    1. Avoid resonance with the system.

    2. When using the pulsating damper, the pulsating damper should be installed between the pump and back pressure valve to absorb the flow peak between the pump and the back pressure valve. Slow down the wear speed of the back pressure valve.

    3. should be applied to protective sheds or protective covers when used outdoors.

    4. Before any maintenance of the back pressure valve, stop the running equipment, release the pressure, turn off the valve associated with the system, while confirming that there is no pressure in the pulsating damper. Pay attention to preventing the liquid from harming the human body during repair.

    5. If the back pressure valve is reversed, the back pressure will be doubled, and the hazards will be hazarded to the system.

    6. The failure of the back pressure valve should be cut off in time in operation.

     

    Diaphragm Back Pressure Valve Detailed List
    Main Data Dimensions(mm)
    Model Body Material Size Max Flow L A B H D1 D2
    VB1P PVC 1/4” 240L/H 102 38 60 19 60 35
    VB1L 316L 1/4” 240L/H 102 38 60 19 60 35
    VB1F PVDF 1/4” 240L/H 102 38 60 19 60 35
    VB2P PVC 1/2” 380L/H 102 38 60 19 60 35
    VB2L 316L 1/2” 380L/H 102 38 60 19 60 35
    VB2F PVDF 1/2” 380L/H 102 38 60 19 60 35
    VB3P PVC 3/4” 650L/H 135 60 70 30 88 54
    VB3L 316L 3/4” 650L/H 135 60 70 30 88 54
    VB3F PVDF 3/4” 650L/H 135 60 70 30 88 54
    VB4P PVC 1” 800L/H 135 60 70 30 88 54
    VB4L 316L 1” 800L/H 135 60 70 30 88 54
    VB4F PVDF 1” 800L/H 135 60 70 30 88 54
    VB5P PVC 1-1/4” 1200L/H 145 70 70 35 100 54
    VB5L 316L 1-1/4” 1200L/H 145 70 70 35 88 54
    VB5F PVDF 1-1/4” 1200L/H 145 70 70 35 100 54
    VB6P PVC 1-1/2” 2600L/H 235 84 100 42 128 84/72
    VB6L 316L 1-1/2” 2600L/H 235 78 100 39 128 84/72
    VB6F PVDF 1-1/2” 2600L/H 235 84 100 42 128 84/72
    VB8P PVC 2” 3200L/H 255 95 100 47.5 128 84/72
    VB8L 316L 2” 3200L/H 250 89 100 44.5 128 84/72
    VB8F PVDF 2” 3200L/H 255 95 100 47.5 128 84/72
    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 0-3 bar
    Valve Top ABS/304SS
    Max Temperature Plastic 45℃, Metal 60℃

    GAG Series Back Pressure Valve 4

    Diaphragm Back Pressure Valve Dimensions

     

    GAG Series Back Pressure Valve 5

    Pumping System Overview

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