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G-Series Medium-Flow Pressure Relief Valves
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Griffco G-Series medium-flow 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 line. Robust construction ensures reliability in the rigorous service of municipal and industrial applications. Also called bypass pressure valves.

G-Series Medium-Flow Pressure Relief Valves

Valve Features

  • Anti-siphon function
  • 2-port and 3-port configurations (90° and 180°)
  • Solid, robust, machined construction
  • Flanged, union, threaded and socket connection options
  • Molded Noryl top with integral hardware locking
  • 316L SS metal valve and top options
  • Molded PTFE/EPDM diaphragm
  • Adjustable up to 350 psi (24 bar)
  • 4 optional pressure ratings (springs)
  • Valve sizes from 1/2" to 4" or DN 15 to DN 100
  • Tamper-resistant adjustment screw
  • High-temperature option up to 300°F (149°C)

Griffco Benefits

  • High reliability at affordable price
  • Long diaphragm life
  • Wide range of valve materials
  • Multiple diaphragm material options
  • Factory or field settable

Available Sizes

  • 1/2" to 4" or DN 15 to DN 100

Wetted Materials

  • PVC
  • CPVC
  • Polypropylene
  • PVDF
  • PTFE

 

  • Halar®
  • 316 SS
  • Alloy 20
  • Hastelloy® C

G-Series PRG - Specifications

G-Series PRG - Data Sheets

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

G-Series PRG - IOM Manuals

TitleDescriptionDate modifiedDownload
IOM Manual PRG (US) Imperial09-18-2020 Download
IOM Manual PRG 3" & 4" (DN 80 & DN 100) Imperial09-14-2020 Download
IOM Manual PRG (Spanish) Metric09-14-2020 Download

G-Series PRG - Dimensional Drawings

G-Series 3-Port @ 180° (1/2" - 1") (DN 15 - DN 25)

G-Series 2-Port @ 180° (1/2" - 1") (DN 15 - DN 25)

G-Series 2-Port @ 180° (1-1/2"- 2") (DN 40 - DN 50)

TitleDescriptionDate modifiedDownload
Dim PRG2 2Port@180 Threaded US 1-1/2"- 2"08-24-2020 Download
Dim PRG2 2Port@180 Threaded Metric DN 40 - DN 5008-24-2020 Download
Dim PRG2 2Port@180 Socket US 1-1/2"- 2"08-24-2020 Download
Dim PRG2 2Port@180 Socket Metric DN 40 - DN 5008-24-2020 Download
Dim PRG2F 2Port@180 Flanged US 1-1/2"- 2"08-24-2020 Download
Dim PRG2F 2Port@180 Flanged Metric DN 40 - DN 5008-24-2020 Download
Dim PRG2U 2Port@180 Union US 1-1/2"- 2"08-24-2020 Download
Dim PRG2U 2Port@180 Union Metric DN 40 - DN 5008-24-2020 Download

G-Series 2-Port @ 180° (3" - 4") (DN 80 - DN 100)

TitleDescriptionDate modifiedDownload
Dim PRG5 2Port@180 Flanged US 3" - 4"08-24-2020 Download
Dim PRG5 2Port@180 Flanged Metric DN 80 - DN 10008-24-2020 Download

G-Series 2-Port @ 90° (1/2" - 1") (DN 15 - DN 25)

G-Series 2-Port @ 90° (1-1/2"- 2") (DN 40 - DN 50)

TitleDescriptionDate modifiedDownload
Dim PRG290 2Port@90 Threaded US 1-1/2"- 2"08-24-2020 Download
Dim PRG290 2Port@90 Threaded Metric DN 40 - DN 5008-24-2020 Download
Dim PRG290 2Port@90 Socket US 1-1/2"- 2"08-24-2020 Download
Dim PRG290 2Port@90 Socket Metric DN 40 - DN 5008-24-2020 Download
Dim PRG290F 2Port@90 Flanged US 1-1/2"- 2"08-24-2020 Download

G-Series PRG - Sectional Drawings

TitleDescriptionDate modifiedDownload
G001 PRV 3-Port08-26-2020 Download
G002 2-Port, PRV 3-Port08-26-2020 Download

3D CAD Drawings Now Available

Three-dimensional CAD drawings are now available for you to download and use in your pumping system designs.

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