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Download the Datasheet!
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G Series Back Pressure Valves
Griffco diaphragm back pressure valves are designed to
enhance the performance of chemical feed systems by applying
a continuous back pressure to the chemical feed pump,
while also acting as an anti-syphon valve. Robust construction
ensures reliability in the rigorous service of municipal
and industrial applications.
Wetted materials include: PVC, CPVC, PP, PVDF, PTFE,
316 SS, A 20 and Hast. C.
Available sizes: ½ - 4".
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Features:
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High Reliability / Low Cost
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Robust, Machined Construction
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Vulcanised PTFE/EPDM Diaphragm
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Adjustable 10 - 250 PSI
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(1 1/2" - 4" Adjustable 10-150
psi)
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Optional 350 PSI Rated Valve (Metal
1/2" - 1" only)
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Anti-Siphon Function
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Wide Range of Materials
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Tamper Resistant Adjustment Screw
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Corrosion Resistant Design
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Operation:
Griffco diaphragm back pressure valves apply positive
discharge pressure to a metering pump system to prevent siphoning
and eliminate varying dosage rates caused by fluctuating downstream
pressure. The diaphragm is held against the valve seat by an
internal spring. When the preset pressure is exceeded, the diaphragm
is forced up and chemical flows through the valve to the injection
point. The valves are preset for 50 psi, however they are field
adjustable from 10 - 250 psi via the adjustment screw. Installation
should be as close to the injection point as possible to prevent
chemical line drainage, and it is most important that all chemical
system equipment such as pulsation dampeners and pressure gauges
are between the pump and back pressure valve.
Technical
Data:
Sizes:
Model BPV
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½", ¾", 1", 1½",
2"
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| Connections: |
NPT, Socket, Flange,
Union |
| Pressure Adjustment |
0-50 psi, 10-150 psi,
10-250 psi,50-350 psi |
| Flow Rates @ 150
psi |
Shipping Weight:
lbs |
| Size |
Pulsating |
Continuous |
Plastic |
Metal / Noryl Top |
Metal / Metal Top |
1/2"
3/4"
1"
1 1/2"
2"
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320 USgph
367 USgph
461 USgph
1388 USgph
2000 USgph
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16 USgpm
19 USgpm
24 USgpm
72 Usgpm
104 USgpm
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3.0
3.0
3.5
9.0
9.0
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5.5
5.5
6.0
18.5
20.0
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6.5
6.5
7.0
26.0
30.0
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| Max Temperature:
(°F) |
Plastic: 140° ;
Metal: 300° (Peak Short Term 390°) |
| Materials of Construction: |
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| Diaphragm |
PTFE / EPDM, Optional:
Viton & PTFE / Viton |
| Valve Top |
Standard: Noryl
Optional: 316 SS, Others on Request |
| Valve Body |
PVC, CPVC,
PP, PTFE, PVDF, 316 SS, A 20, Hast. C, Others on Request |
Installation:
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