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
| Size | Maximum Flow | Maximum Pressure | |||||
| Pulsating | Continuous | ||||||
| Inch | Metric | GPH | LPH | GPM | LPM | PSI | BAR |
| 1/2" | DN 15 | 320 | 1,211 | 17 | 63 | 350 | 24 |
| 3/4" | DN 20 | 367 | 1,399 | 19 | 72 | 350 | 24 |
| 1" | DN 25 | 462 | 1,748 | 24 | 90 | 350 | 24 |
| 1-1/2" | DN 40 | 1,388 | 5,254 | 72 | 275 | 250 | 17 |
| 2" | DN 50 | 1,533 | 5,803 | 80 | 302 | 250 | 17 |
| 3" | DN 80 | 5,157 | 19,521 | 270 | 1,020 | 250 | 17 |
| 4" | DN 100 | 5,157 | 19,521 | 270 | 1,020 | 250 | 17 |
G-Series PRG - Data Sheets
| Title | Description | Date modified | Download |
|---|---|---|---|
| Data Sheet PRG (US) | Imperial | 09-14-2020 | Download |
| Data Sheet PRG (Intl) | Metric | 09-14-2020 | Download |
| Data Sheet PRG (Spanish) | Metric | 09-14-2020 | Download |
G-Series PRG - IOM Manuals
| Title | Description | Date modified | Download |
|---|---|---|---|
| IOM Manual PRG (US) | Imperial | 05-21-2021 | Download |
| IOM Manual PRG 3" & 4" (DN 80 & DN 100) | Imperial | 09-14-2020 | Download |
| IOM Manual PRG (Spanish) | Metric | 09-14-2020 | Download |
G-Series PRG - Dimensional Drawings
G-Series 3-Port @ 180° (1/2" - 1") (DN 15 - DN 25)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG1 3Port@180 Threaded US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG1 3Port@180 Threaded Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG1 3Port@180 Socket US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG1 3Port@180 Socket Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRGF 3Port@180 Flanged US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRGF 3Port@180 Flanged Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRGU 3Port@180 Union US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRGU 3Port@180 Union Metric | DN 15 - DN 25 | 08-24-2020 | Download |
G-Series 2-Port @ 180° (1/2" - 1") (DN 15 - DN 25)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG2 2Port@180 Threaded US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Threaded Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Socket US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Socket Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG2F 2Port@180 Flanged US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG2F 2Port@180 Flanged Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG2U 2Port@180 Union US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG2U 2Port@180 Union Metric | DN 15 - DN 25 | 08-24-2020 | Download |
G-Series 2-Port @ 180° (1-1/2"- 2") (DN 40 - DN 50)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG2 2Port@180 Threaded US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Threaded Metric | DN 40 - DN 50 | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Socket US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG2 2Port@180 Socket Metric | DN 40 - DN 50 | 08-24-2020 | Download |
| Dim PRG2F 2Port@180 Flanged US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG2F 2Port@180 Flanged Metric | DN 40 - DN 50 | 08-24-2020 | Download |
| Dim PRG2U 2Port@180 Union US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG2U 2Port@180 Union Metric | DN 40 - DN 50 | 08-24-2020 | Download |
G-Series 2-Port @ 180° (3" - 4") (DN 80 - DN 100)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG5 2Port@180 Flanged US | 3" - 4" | 08-24-2020 | Download |
| Dim PRG5 2Port@180 Flanged Metric | DN 80 - DN 100 | 08-24-2020 | Download |
G-Series 2-Port @ 90° (1/2" - 1") (DN 15 - DN 25)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG290 2Port@90 Threaded US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Threaded Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Socket US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Socket Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG290F 2Port@90 Flanged US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG290F 2Port@90 Flanged Metric | DN 15 - DN 25 | 08-24-2020 | Download |
| Dim PRG290U 2Port@90 Union US | 1/2" - 1" | 08-24-2020 | Download |
| Dim PRG290U 2Port@90 Union Metric | DN 15 - DN 25 | 08-24-2020 | Download |
G-Series 2-Port @ 90° (1-1/2"- 2") (DN 40 - DN 50)
| Title | Description | Date modified | Download |
|---|---|---|---|
| Dim PRG290 2Port@90 Threaded US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Threaded Metric | DN 40 - DN 50 | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Socket US | 1-1/2"- 2" | 08-24-2020 | Download |
| Dim PRG290 2Port@90 Socket Metric | DN 40 - DN 50 | 08-24-2020 | Download |
| Dim PRG290F 2Port@90 Flanged US | 1-1/2"- 2" | 08-24-2020 | Download |
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Three-dimensional CAD drawings are now available for you to download and use in your pumping system designs.
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