PVC Series Back Pressure Valves

All thermoplastic diaphragm Back Pressure Valve for chemical feed systems, applies back pressure to a metering pump to prevent siphoning and eliminates varying dosage rates resulting from fluctuating downstream pressure. When the preset pressure is exceeded, the diaphragm is forced up and chemical flows through the valve to the injection point. All valves are preset for 50 psi, but are field adjustable via the adjustment screw. Installation should be as close to the injection point as possible to prevent chemical line drainage and it is most important that all chemical system equipment such as pulsation dampeners and pressure gauges are between the pump and back.

Diaphragms: PFTE / EPDM
Product Body: PVC,PVDF, carbon steel, SS304,SS316L
Adjustable pressure: 0-0.3MPa，0-1.0MPa
Connection type: Thread / Flange,  can be customized

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Back pressure valve  is acting as an anti-siphon valve.  it’s used to prevent liquid from flowing or siphoning due to Gravitation. At this time, the back pressure valve can reduce the flow due to siphon and control the pressure fluctuations. Anti-siphon valves allow water to only flow in one direction.

Features of PVC Series Back Pressure Valves

  • With Diaphragm structure spring and the pressure will be adjustable.
  • The medium contacting parts are only the lower valve body and the diaphragm and they are assembled with sealing rib which has good sealing effect and high sensitivity.
  • EPDM lining PTFE with Cloth type diaphragm has a very good sealing effect and long service life, The PTFE type diaphragm has a very good performance in high temperature resistance corrosion resistance.
Connection typeThread, flange etc. and can be customized
Adjustable pressure0-0.3MPa，0-1.0MPa
Safety test pressure1.5 times the maximum input pressure
Applicable temperature-5℃ to +80℃ for EPDM lining PTFE diaphragm
-5℃ to +80℃ for PTFE diaphragm
Available materials
Materials for Lower valve bodyPVC,SS304,SS316L,PTFE,PVDF,PP,carbon steel etc
materials for diaphragmEPDM lining PTFE diaphragm，PTFE diaphragm
Material for upper valve bodyPVC,carbon steel(nickel plated,black oxide etc.), SS304,SS316L

 

Specifications and models of back pressure valve

ModelsMaterialDia.（mm）Pressure（MPa）SizeConnection
D(mm)Lower valve bodyH(mm)
RXBF-P6/1.0PVC60.1-1.064.782Rc1/8”
RXBF-P8/1.0PVC80.1-1.064.787Rc1/4”
RXBF-P10/1.0PVC100.1-1.064.789Rc3/8”
RXBF-P15/1.0PVC150.1-1.064.794Rc1/2”
RXBF-P20/1.0-NPVC200.1-1.064.7(for pumps flow≤250L/h)104Rc3/4”
RXBF-P20/1.087123
RXBF-P25/1.0PVC250.1-1.087128Rc1”
RXBF-P32/1.0PVC320.1-1.0117175Rc1+1/4”
RXBF-P40/1.0-NPVC400.1-1.0117(for pumps flow≤2500L/h)185Rc1+1/2”
RXBF-P40/1.0137240
RXBF-P50/1.0PVC500.1-1.0167260Rc2”
RXBF-P65/1.0PVC650.1-1.0177325Rc2+1/2”
RXBF-P80/0.6PVC800.1-0.6230420Rc3”
RXBF-P100/0.6PVC1000.1-0.6250430Rc4”
RXBF-S6/1.0SUS304/316L60.1-1.064.782Rc1/8”
RXBF-S8/1.0SUS304/316L80.1-1.064.787Rc1/4”
RXBF-S10/1.0SUS304/316L100.1-1.064.789Rc3/8”
RXBF-S15/1.0SUS304/316L150.1-1.064.794Rc1/2”
RXBF-S20/1.0-NSUS304/316L200.1-1.064.7(for pumps flow≤250L/h)104Rc3/4”
RXBF-S20/1.087123
RXBF-S25/1.0SUS304/316L250.1-1.087128Rc1”
RXBF-S32/1.0SUS304/316L320.1-1.0117175Rc1+1/4”
RXBF-S40/1.0-NSUS304/316L400.1-1.0117185Rc1+1/2”
RXBF-S40/1.0137240
RXBF-S50/1.0SUS304/316L500.1-1.0167260Rc2”
RXBF-S65/1.0SUS304/316L650.1-1.0177325Rc2+1/2”
RXBF-S80/0.6SUS304/316L800.1-0.62254203”flange type
RXBF-S100/0.6SUS304/316L1000.1-0.62404304”flange type

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