M-Series
Griffco M-Series back pressure valves and pressure relief valves are designed to enhance the performance of chemical (dosing) pump systems by applying a continuous back pressure to the chemical feed pump, while also acting as an anti-syphon valve. The robust construction ensures reliability in heavy-duty industrial applications, among others.
Liquid-contactmaterials:
- PVC
- CPVC
- PP
- PVDF
- PTFE
- Halar®
- SS 316L
- Alloy 20
- Hastelloy® C
Available sizes:
1/4″ up to 1/2″ or DN 8 up to DN 15
Features and benefits:
- High reliability at an affordable price
- Anti-syphon function
- Solid, robust, (machined) construction
- Wide range of available materials
- Flanged-, union-, threaded- and glue/weld options
- Injection moulded Noryl top with integrated pressure lock
- SS316 metall-top option
- Moulded PTFE / EPDM-diaphragm
- Several materialoptions for diaphragms
- Long lifetime diaphragm
- Adjustable up to 24 bar
- 4 optional pressure ranges (springs)
- Valve sizes from 1/4″ to 1/2″ or DN 8 to DN 15
- Tamper proof set screw
- High temperature option up to 150 ° C
- factory-set to desired pressure or field settable
Sizes, flowrange and pressure classifications | |||||||
Sizes | Maximum flow | Max pressure | |||||
Pulsing | Continiously | ||||||
Inch | Metric | GPH | LPH | GPM | LPM | PSI | BAR |
1/4″ | DN 8 | 100 | 375 | 5 | 19 | 350 | 24 |
3/8″ | DN 10 | 200 | 757 | 10 | 37 | 350 | 24 |
1/2″ | DN 15 | 260 | 984 | 15 | 57 | 350 | 24 |


