Back Pressure Valve

Low Pressure Diaphragm Back Pressure Valve

A low-pressure diaphragm back-pressure valve is an essential component used to stabilize the pressure in front of the valve, prevent pump self-flow, and siphon in a wide range of industries. It is commonly used in conjunction with a metering pump to improve its metering accuracy.


Technical Parameters:

  • Adjustable pressure range:  0-0.3MPa, 0-1.0MPa (see parameter table for details)

  • Safety test pressure:  1.5 times the maximum input pressure

  • Applicable temperature:  Ordinary diaphragm (-5℃ to +80℃); 

                                                  PTFE diaphragm (-40℃ to +150℃)

Material:

  • Lower valve body (flow-through part): PVC, SS304, SS316L, PTFE lining, PVDF, PP, carbon steel, Hastelloy, etc. 

  • Diaphragm: EPDM lined with PTFE, PTFE, metal diaphragm, UPE, etc.

  • Upper valve body: Nylon, carbon steel, SS304, SS316L, etc.


Product Description

The valve features a diaphragm that responds quickly to changes in pressure and adjusts the valve opening accordingly to maintain a constant pressure. This ensures a stable flow rate and prevents overpressure or underpressure in the system. With its low-pressure capabilities, this type of back-pressure valve is suitable for a range of applications where precise control of pressure and flow is required, such as in chemical processing, water treatment, and pharmaceutical manufacturing.

THE low-pressure diaphragm back-pressure valve is an efficient solution to maintain stable pressure in a system, prevent pump self-flow and siphon, and improve the accuracy of metering pumps. Its fast response, precise control, and versatility make it an indispensable tool for a wide range of industries.



Design features of a back pressure valve:

The structure is of a spring diaphragm type, with adjustable pressure, providing stable pressure for the valve.

The contact medium includes the lower valve body and diaphragm, and the sealing part of the lower valve body and diaphragm is processed with a sealing rib, which has a good sealing effect and high sensitivity.

The conventional diaphragm is made of EPDM or PTFE, and processed with cloth for good sealing effect and high service life. The pure PTFE diaphragm has high temperature resistance and strong corrosion resistance.


Model parameter of low pressure diaphragm back pressure valve:

Model

Material

Dia. (mm)

Adjusting Pressure  (MPa)

Threaded Connection

Flanged Connection

Height(mm)

Lower Valve Body Dia. (mm)

Flange Distance(mm)

RXBF-P6/1.0

PVC

6

0.1-1.0

64.7

- 

80

RXBF-P8/1.0

PVC

8

0.1-1.0

64.7

 -

85

RXBF-P10/1.0

PVC

10

0.1-1.0

64.7

 -

90

RXBF-P15/1.0

PVC

15

0.1-1.0

64.7

161

92

RXBF-P20/1.0-N

PVC

20

0.1-1.0

64.7(For pump flow 250L/h)

166

102

RXBF-P20/1.0

PVC

20

0.1-1.0

86.8

205

125

RXBF-P25/1.0

PVC

25

0.1-1.0

86.8

215

125

RXBF-P32/1.0

PVC

32

0.1-1.0

117.6

260

169

RXBF-P40/1.0-N

PVC

40

0.1-1.0

117.6(For pump flow 2500L/h)

275

169

RXBF-P40/1.0

PVC

40

0.1-1.0

136.6

295

200

RXBF-P50/1.0-N

PVC

50

0.1-1.0

136.6

320

215

RXBF-P50/1.0

PVC

50

0.1-1.0

164.4

348

270

RXBF-P65/1.0

PVC

65

0.1-1.0

178

305

300

RXBF-P80/0.6

PVC

80

0.1-0.6

230

380

410

RXBF-P100/0.6

PVC

100

0.1-0.6

250

420

450


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