Pressure Relief Valve

Diaphragm Pressure Relief Valve

The Diaphragm Style Pressure Relief Valve is a type of safety valve that automatically opens and releases pressure in a pressure system when the pressure exceeds a set limit. It is designed to protect equipment and pipelines from damage caused by excess pressure, thus ensuring safe and efficient operation. The valve features a spring-loaded diaphragm structure that allows for adjustable pressure ranges (as specified in the parameter table), and provides sensitive and accurate response to changes in pressure. The valve body and diaphragm are the only parts that come into contact with the medium, ensuring effective sealing and high sensitivity. The valve is available in various materials such as PVC, stainless steel, PTFE, PVDF, PP, carbon steel, and Hastelloy alloy, and can be customized to suit specific requirements. The valve is suitable for use in a wide range of applications, including chemical processing, oil and gas, pharmaceuticals, and food and beverage industries.

Product Description

Features of diaphragm pressure relief valve:

• The spring diaphragm structure allows adjustable pressure (see parameter table for adjustment range) and overpressure relief to protect equipment and pipeline safety.

• The contact medium only includes the lower valve body and diaphragm. The sealing effect is good and the sensitivity is high, with sealing ribs processed at the sealing position of the lower valve body and diaphragm.

• The conventional diaphragm is made of EPDM lining Teflon, and the sealing effect is good with high service life. The pure Teflon diaphragm is high temperature resistant and has strong corrosion resistance.

Technical Specs:

• Adjustable pressure range: plastic material 0-1.0 MPa, metal material 0-2.5 MPa; 0-15MPa (see parameter table for details).

• Safety test pressure: 1.5 times the maximum input pressure.

• Applicable temperature: conventional diaphragm -5°C to +80°C; Teflon diaphragm: -40°C to +150°C.

• Can be equipped with insulation jacket.

Materials:

• Lower valve body (flow-through component) materials: PVC, SS304, SS316L, PTFE, PVDF, PP, carbon steel, Hastelloy, etc. (can be customized according to requirements).

• Diaphragm materials: EPDM lining Teflon (composite diaphragm), PTFE (polytetrafluoroethylene), UPE, etc.

• Upper valve body materials: nylon, carbon steel (electrophoretic paint treatment, spray treatment), SS304, SS316L, etc., can be customized according to requirements.


Model

Material

Dia. (mm)

Adjusting Pressure  (MPa)


Threaded Connection

Flanged Connection

Height(mm)

Lower Valve Body Dia. (mm)

Flange Distance(mm)

RXAF-P6/1.0

PVC

6

0.1-1.0

64.7


80

RXAF-P8/1.0

PVC

8

0.1-1.0

64.7


85

RXAF-P10/1.0

PVC

10

0.1-1.0

64.7


90

RXAF-P15/1.0

PVC

15

0.1-1.0

64.7

161

92

RXAF-P20/1.0-N

PVC

20

0.1-1.0

64.7(For pump flow ≤250L/h)

166

102

RXAF-P20/1.0

PVC

20

0.1-1.0

86.8

205

125

RXAF-P25/1.0

PVC

25

0.1-1.0

86.8

215


RXAF-P32/1.0

PVC

32

0.1-1.0

117.6

260

169

RXAF-P40/1.0-N

PVC

40

0.1-1.0

117.6(For pump flow ≤2500L/h)

275


RXAF-P40/1.0

PVC

40

0.1-1.0

136.6

295

200

RXAF-P50/1.0-N

PVC

50

0.1-1.0

136.6

320

215

RXAF-P50/1.0

PVC

50

0.1-1.0

164.4

348

270

RXAF-P65/1.0

PVC

65

0.1-1.0

178

305

300

RXAF-P80/1.0

PVC

80

0.1-1.0

230

380

410

RXAF-P1001.0

PVC

100

0.1-1.0

250

420

450

RXAF-S6/*

SS304/316L

6

0.1-2.5;0.1-10

64.7

80

RXAF-S8/*

SS304/316L

8

0.1-2.5;0.1-10

64.7

 -

85

RXAF-S10/*

SS304/316L

10

0.1-2.5;0.1-10

64.7

 -

90

RXAF-S15/*

SS304/316L

15

0.1-2.5;0.1-10

64.7

143

92

RXAF-S20/*-N

SS304/316L

20

0.1-2.5;0.1-10

64.7(For pump flow ≤250L/h)

143

102

RXAF-S20/*

SS304/316L

20

0.1-2.5;0.1-10

86.8

176

125

RXAF-S25/*

SS304/316L

25

0.1-2.5;0.1-10

86.8

176

125

RXAF-S32/*

SS304/316L

32

0.1-2.5;0.1-10

117.6

221

169

RXAF-S40/*-N

SS304/316L

40

0.1-2.5;0.1-10

117.6(For pump flow ≤2500L/h)

221

172

RXAF-S40/*

SS304/316L

40

0.1-2.5;0.1-10

136.6

242

250

RXAF-S50/*-N

SS304/316L

50

0.1-2.5

136.6

242

265

RXAF-S50/*

SS304/316L

50

0.1-2.5

164.4

291

270

RXAF-S65/*-N

SS304/316L

65

0.1-2.0

164.4

291

290

RXAF-S65/*

SS304/316L

65

0.1-2.0

178

314

300

RXAF-S80/*-N

SS304/316L

80

0.1-2.0

178

314

320

RXAF-S80/*

SS304/316L

80

0.1-2.0

230

374

410

RXAF-S100/*-N

SS304/316L

100

0.1-2.0

217/273(Max Dia.)

400

450


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