Pressure Relief Valves: M-Series Low-Flow

Griffco M-Series diaphragm low-flow pressure relief valves are pump system valves 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 known as bypass valves.

Available Sizes

1/4″ to 1/2″ or DN 8 to DN 15

Maximum Flow Pulsating – 300 gph (1135 lph)
Maximum Flow Continuous – 15 gpm (57 lpm)
Maximum Pressure – 350 psi (24 bar)

3D CAD Drawings Available

M-Series Low-Flow

Features

2-port, 3-port, and 90° configurations
Solid, robust, machined construction
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 1/4″ to 1/2″ or DN 8 to DN 15
Tamper-resistant adjustment screw
High-temperature option up to 300°F (149°C)

Griffco Benefits

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

Wetted Materials

PVC
CPVC
Polypropylene
PVDF
PTFE
Halar®
316 SS
Alloy 20
Hastelloy® C

SIZE

MAXIMUM FLOW
PULSATING

MAXIMUM FLOW
CONTINUOUS

MAXIMUM PRESSURE

IMPERIAL	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	300	1,135	15	57	350	24

Image	Product	Description
C-PRM2050PS	1/2″ M-Series 2-Port Bi-Pass Valve	PVC – Socket with CRN
C-PRM2050S	1/2″ M-Series 2-Port Bi-Pass Valve	316SS with CRN
C-PRM2050S1OSS90	1/2″ M-Series 2-Port Bi-Pass Valve	316SS – 50 psi Spring – 316SS Top – 90 Degree with CRN #..Pressure Set: 20 psi
C-PRM2050S2OSS	1/2″ M-Series 2-Port Bi-Pass Valve	316SS – 250 psi Spring – 316SS Top with CRN
C-PRM2050S2SOSS	1/2″ M-Series 2-Port Bi-Pass Valve	316SS – 250 psi Spring – Socket – 316SS Top with CRN
C-PRM2050S90	1/2″ M-Series 2-Port Bi-Pass Valve	316SS – 90 Degree with CRN Label
C-PRM2050SS	1/2″ M-Series 2-Port Pressure	Relief Valve – 316SS – Socket with CRN
PRIM050KG11	1/2″ M-Series 2-Port Pressure	Relief Valve – PVDF – Back Mount Economy Gauge – 160 psi Range
PRIM050PG11	1/2″ M-Series 2-Port Pressure	Relief Valve – PVC – Back Mount Economy Gauge – 160 psi Range
PRIM050PG31	1/2″ M-Series 2-Port Pressure	Relief Valve – PVC – Back Mount Premium Gauge – 160 psi Range

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M-Series PRM – Data Sheets
Data Sheet PRM (US)	Imperial	09-14-2020
Data Sheet PRM (Intl)	Metric	09-14-2020
Data Sheet PRM (Spanish)	Metric	09-14-2020
M-Series PRM – IOM Manuals
IOM Manual PRM (US)	Imperial	05-21-2021
IOM Manual PRM (Spanish)	Metric	05-21-2021
M-Series PRM – Dimensional Drawings M-Series 3-Port @ 180° (1/4″ – 1/2″) (DN 8 – DN 15)
Dim PRM 3Port@180 Threaded US	1/4″ – 1/2″	08-24-2020
Dim PRM 3Port@180 Threaded Metric	DN 8 – DN 15	08-24-2020
Dim PRM 3Port@180 Socket US	1/4″ – 1/2″	08-24-2020
Dim PRM 3Port@180 Socket Metric	DN 8 – DN 15	08-24-2020
Dim PRMU 3Port@180 Union US	1/4″ – 1/2″	08-24-2020
Dim PRMU 3Port@180 Union Metric	DN 8 – DN 15	08-24-2020
M-Series PRM – Dimensional Drawings M-Series 2-Port @ 180° (1/4″ – 1/2″) (DN 8 – DN 15)
Dim PRM2 2Port@180 Threaded US	1/4″ – 1/2″	08-24-2020
Dim PRM2 2Port@180 Threaded Metric	DN 20 – DN 25	08-24-2020
Dim PRM2 2Port@180 Socket US	1/4″ – 1/2″	08-24-2020
Dim PRM2 2Port@180 Socket Metric	DN 8 – DN 15	08-24-2020
Dim BPMF 2Port@180 Flanged US	1/4″ – 1/2″	08-24-2020
Dim BPMF 2Port@180 Flanged Metric	DN 8 – DN 15	08-24-2020
Dim BPMU 2Port@180 Union US	1/4″ – 1/2″	08-24-2020
Dim BPMU 2Port@180 Union Metric	DN 8 – DN 15	08-24-2020
M-Series PRM – Dimensional Drawings M-Series 2-Port @ 90° (1/4″ – 1/2″) (DN 8 – DN 15)
Dim PRM290 2Port@90 Threaded US	1/4″ – 1/2″	08-24-2020
Dim PRM290 2Port@90 Threaded Metric	DN 8 – DN 15	08-24-2020
Dim PRM2F90 2Port@90 Flanged US	1/4″ – 1/2″	08-24-2020
Dim PRM2F90 2Port@90 Flanged Metric	DN 8 – DN 15	08-24-2020
M-Series PRM – Sectional Drawings
M001		08-26-2020