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Back Pressure Valves/Relief Valves for Low-Pressure Metering Pumps

Back pressure valves are used to generate a constant back pressure and achieve precise metering in systems with a free outlet. They are also used in conjunction with pulsation dampers to generate low-pulsation metering.

Product description

Accurately metered

Back pressure valves are designed for different applications. Please refer to the relevant notes for the different designs.

Relief valves are used in the bypass to protect pumps, pipes and fittings from overpressure in the event of incorrect operation or blockages. In the event of a malfunction, the pump pumps back into the storage tank.

The benefits for you

  • Protects against overpressure
  • Priming aid
  • Relieves the pressure line
  • Increases dosing precision

Backpressure & Pressure Relief Valves

Backpressure, antisiphon and pressure relief valves

Backpressure (2-port) valves may be used in-line to provide a constant discharge pressure for protection from siphoning, or they may be teed off of the discharge line for pressure relief, discharging back to the source tank or to the pump suction line to create a bypass.

Pressure relief (3-port) valves are mounted in the discharge line, featuring a separate relief port which discharges back to the source tank or to the pump suction line to create a bypass.

Backpressure valves provide several functions: they improve repeatability by providing a constant discharge pressure; they provide antisiphon protection for discharge into pressurized water lines or vacuums, or where suction head exceeds discharge head; and they minimize pulsation when used in conjunction with a pulsation dampener.

In-line backpressure/antisiphon and pressure relief valves

These adjustable backpressure (2-port) and pressure relief (3-port) valves have FNPT ports and require tubing adapters for use with flexible tubing.

Can be adjusted with screwdriver.

Dimensions in inches (mm)

ABCDE
2.6 (65)1/4 NPT1.2 (31)4.9 (125)6.2 (158)
2.6 (65)1/2 NPT1.2 (31)4.9 (125)6.2 (158)
3.5 (88)3/4 NPT1.1 (28)5.4 (136)6.7 (169)
3.9 (98)1 NPT1.4 (36)5.7 (145)7.0 (178)
4.6 (118 )1-1/2 NPT2.2 (56)9.0 (229.5 )10.3 (260.5)
4.6 (118 )2 NPT2.2 (56)9.0 (229.5 )10.3 (260.5)
  • us_pc_4_001

Pressure Relief Valves

1/4" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1009444

PVC

1009445

PVDF

1009446

316 SS

1009447

1/4" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1009452

PVC

1009453

PVDF

1009454

316 SS

1009455

Tubing Adapters

(1 required per valve port): 1/4" x 3/16" tubing x 1/4" MNPT

 

Order no.

PP/EPDM

7500060

PP/Viton®

7500058

PVC/EPDM

7500064

PVC/Viton®

7500062

1/2" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1006846

PVC

1006850

PVDF

1006854

316 SS

1008796

1/2" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1006858

PVC

1006862

PVDF

1006866

316 SS

1008800

Tubing Adapters

(1 required per valve port): 1/2" x 3/8" tubing x 1/2" MNPT

 

Order no.

PP/EPDM

7500061

PP/Viton®

7500059

PVC/EPDM

7500065

PVC/Viton®

7500063

3/4" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1006847

PVC

1006851

PVDF

1006855

316 SS

1008797

3/4" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1006859

PVC

1006863

PVDF

1006867

316 SS

1008801

1" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1006848

PVC

1006852

PVDF

1006856

316 SS

1008798

1" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1006860

PVC

1006864

PVDF

1006868

316 SS

1008802

1-1/2" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1006849

PVC

1006853

PVDF

1006857

316 SS

7302243

1-1/2" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1006861

PVC

1006865

PVDF

1006869

316 SS

7302261

2" FNPT Backpressure Valves (2-port)

 

Order no.

PP

1009448

PVC

1009449

PVDF

1009450

316 SS

7302247

2" FNPT Backpressure Valves (3-port)

 

Order no.

PP

1009456

PVC

1009457

PVDF

1009458

316 SS

7302265

Spare Parts Sets

Contains 1 of each: compression spring, diaphragm, spring plate, and pressure adj. disc.

 

Order no.

SPK 1/4" - 1/2"

1035446

SPK 3/4" - 1"

1035447

SPK 1-1/2” - 2"

1035448

Spare Diaphragms

 

Order no.

1/4" - 1/2" valve PTFE/EPDM

1006813

3/4" - 1" valve PTFE/EPDM

1006814

1-1/2” - 2" valve PTFE/EPDM

1006815

High pressure relief valve, adjustable, 1/4" and 1/2" NPT for Sigma X, Makro HK and ProMus pumps

Can also be used as a backpressure valve for < 30 gph (113 l/h).These valves are without springs, which must be ordered separately.

Connector size

Order no.

Stainless steel/Viton®

1/4" NPT male and female thread

7202505

Stainless steel/EPDM

1/4" NPT male and female thread

7744507

Spring counter pressure min.

Spring counter pressure max.

Spring colour

Order no.

psi

psi

49

348

blue

7202519

348

754

yellow

7202520

754

1,494

violet

7202525

1,494

2,248

orange

7202524

2,248

3,002

brown

7202523

3,002

4,003

white

7202522

4,003

5,004

red

7202521

Connector size

Order no.

Stainless steel/Viton®

1/2" NPT male and female thread

7744508

Stainless steel/EPDM

1/2" NPT male and female thread

7744509

Spring counter pressure min.

Spring counter pressure max.

Spring colour

Order no.

psi

psi

49

348

blue

7744510

348

725

yellow

7744511

725

1,450

violet

7744512

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Overview

Accurately metered

Back pressure valves are designed for different applications. Please refer to the relevant notes for the different designs.

Relief valves are used in the bypass to protect pumps, pipes and fittings from overpressure in the event of incorrect operation or blockages. In the event of a malfunction, the pump pumps back into the storage tank.

The benefits for you

  • Protects against overpressure
  • Priming aid
  • Relieves the pressure line
  • Increases dosing precision

Technical Data

Downloads

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