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High-Pressure Relief Valves
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Griffco High-Pressure Relief Valves are designed to protect chemical feed systems from over pressure damage caused by defective equipment or a blockage in the chemical feed chemical feed line.

Robust construction ensures reliability in the rigorous service of municipal and industrial applications. Also known as high-pressure pump bypass valves.

Metallic High-Pressure Relief Valves

Valve Features

  • Pressure range 350 to 4000 psi (24 to 275 bar)
  • 2-port, 90° configuration
  • PVDF piston
  • Solid, robust, machined construction
  • Threaded and socket connection options
  • 316 SS top standard
  • Composite PTFE/EPDM diaphragm
  • Valve sizes from 1/4" to 1" or DN 8 to DN 25
  • 4 optional pressure ratings (springs)
  • Tamper-resistant adjustment screw
  • High-temperature option up to 300°F (149°C)

Griffco Benefits

  • High reliability at affordable price
  • Compact size for OEM applications
  • Multiple diaphragm material options
  • Long diaphragm life
  • Factory or field settable

Available Sizes

  • 1/4", 3/8", 1/2", 3/4" & 1" or DN 8, DN 10, DN 15, DN 20 & DN 25

Wetted Materials

  • 316 SS
  • Alloy 20
  • Hastelloy® C

High-Pressure Relief Valves PRHP - Specifications

High Pressure PRHP - Data Sheets

TitleDescriptionDate modifiedDownload
Data Sheet PRHP (US) Imperial09-14-2020 Download
Data Sheet PRHP (Spanish) Metric09-14-2020 Download

High Pressure PRHP - IOM Manuals

TitleDescriptionDate modifiedDownload
Manual PRHP (US) Imperial08-09-2020 Download
Manual PRHP (Spanish) Metric08-09-2020 Download

High Pressure PRHP - Dimensional Drawings

High-Pressure 2-Port @ 90° (1/4" - 1/2") (DN 8 - DN 15)

TitleDescriptionDate modifiedDownload
Dim PRHP90 2Port@90 Threaded US 1/4" - 1/2"08-24-2020 Download
Dim PRHP90 2Port@90 Threaded Metric DN 8 - DN 1508-24-2020 Download

High-Pressure 2-Port @ 90° (3/4" - 1") (DN 20 - DN 25)

TitleDescriptionDate modifiedDownload
Dim PRHP2 2Port@90 Threaded US 3/4" - 1"08-24-2020 Download
Dim PRHP2F 2Port@90 Flanged US 3/4" - 1"08-24-2020 Download
Dim PRHP2F 2Port@90 Flanged Metric DN 20 - DN 2508-24-2020 Download

High Pressure PRHP - Sectional Drawings

TitleDescriptionDate modifiedDownload
HP001 08-26-2020 Download

High Pressure PRHP - Exploded Views

TitleDescriptionDate modifiedDownload
HP001-X 08-26-2020 Download
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