Pressure Relief Valves: High-Flow

Griffco High-Flow diaphragm pressure relief valves are designed to protect chemical transfer systems from over pressure damage caused by defective equipment or a blockage in the chemical feed chemical feed line. Large orifice sizes facilitate high flows and higher viscosity fluids.

Available Sizes

1/2″, 3/4″, 1″, 1-1/2″, & 2″ or DN 15, DN 20, DN 25, DN 40 & DN 50

Maximum Flow Pulsating – 5,157 gph (19,521 lph)
Maximum Flow Continuous – 270 gpm (1,022 lpm)
Maximum Pressure – 250 psi (17 bar)

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High-Flow

Features

Higher flow / lower pressure drop
Large orifice for high-viscosity fluids
2-port design
Ventable to suction line
Solid, robust, machined construction
Flanged and socket connection options
Molded Noryl top with integral hardware locking
Composite PTFE/EPDM diaphragm
Adjustable up to 250 psi (17 bar)
Valve sizes from 1/2″ to 2″ or DN 15 to DN 50
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

Wetted Materials

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

SIZE

MAXIMUM FLOW
PULSATING

MAXIMUM FLOW
CONTINUOUS

MAXIMUM PRESSURE

IMPERIAL	METRIC	GPH	LPH	GPM	LPM	PSI	BAR
1/2″	DN 15	600	2,271	30	114	250	17
3/4″	DN 20	600	2,271	30	114	250	17
1″	DN 25	1,000	3,785	54	204	250	17
1-1/2″	DN 40	5,157	19,521	270	1,022	250	17
2″	DN 50	5,157	19,521	270	1,022	250	17

SKU	Product	Description
PRHF105S	1″ High Flow 2-Port Pressure	Relief Valve – 316SS
PRHF105S1S	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 50 psi Spring – Socket (5″ Dia)..Pressure Set: 20 psi
PRHF105S2	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring
PRHF105S2FOSS	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring – 150# Flanges – 316SS Top (Max rating 230 psi due to flange rating)
PRHF105S2OSS	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring – 316SS Top
PRHF105S2TVC	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring – Ferrule Ends (includes gasket and tri-clamp) PTFE/Viton Diaphragm
PRHF105S2V	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring – Viton
PRHF105S2VFOSS	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 250 psi Spring – Viton – 150# Flanged – 316SS Top (Max rating 230 psi due to flange rating)
PRHF105SF	1″ High Flow 2-Port Pressure	Relief Valve – 316SS 150# Flanges
PRHF105SFMSS300	1″ High Flow 2-Port Pressure	Relief Valve – 316SS – 350 psi Spring – 300# Flanges – 316SS Top

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DESCRIPTION

DATE MODIFIED

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High-Flow PRHF – Data Sheets
Data Sheet PRHF (US)	Imperial	06-28-2021
Data Sheet PRHF (Intl)	Metric	09-14-2020
Data Sheet PRHF (Spanish)	Metric	09-14-2020
High-Flow PRHF – IOM Manuals
IOM Manual PRHF (US)	Imperial	06-28-2021
High-Flow PRHF – Dimensional Drawings High-Flow 2-Port @ 180° (1/2″ – 3/4″) (DN 15 – DN 20)
Dim PRHF 2Port@180 Threaded US	1/2″ – 3/4″	08-24-2020
Dim PRHF 2Port@180 Threaded Metric	DN 15 – DN 20	08-24-2020
Dim PRHF 2Port@180 Socket US	1/2″ – 3/4″	08-24-2020
Dim PRHF 2Port@180 Socket Metric	DN 15 – DN 20	08-24-2020
Dim PRHFF 2Port@180 Flanged Metric	DN 15 – DN 20	08-24-2020
High-Flow PRHF – Dimensional Drawings High-Flow 2-Port @ 180° (1″) (DN 25)
Dim PRHF 2Port@180 Threaded US	1″	08-24-2020
Dim PRHF 2Port@180 Threaded Metric	DN 25	08-24-2020
Dim PRHF 2Port@180 Socket US	1″	08-24-2020
Dim PRHF 2Port@180 Socket Metric	DN 25	08-24-2020
Dim PRHFF 2Port@180 Flanged Metric	DN 25	08-24-2020