Griffco Valve T-Series - Manual (Page 3)

TYPICAL INSTALLATION
INJECTION
VALVE
CHEMICAL
CONTAINER
GRIFFCO BACK PRESSURE /ANTI-SIPHON
VALVE WITH OPTIONAL PRIMING VALVE
GRIFFCO
CALIBRATION
CYLINDER
GRIFFCO PRESSURE
RELIEF VALVE
CHEMICAL
FEED PUMP
PULSATION
DAMPENER
OPTIONAL PRESSURE RELIEF PIPING
Y-STRAINER
ISOLATING BALL VALVES
DRAIN VALVE
SHUT OFF VALVE
MAINTENANCE:
The pressure relief and back pressure valves are
designed to minimize the amount of maintenance
required to keep the valves in operation. However,
periodic replacement of the diaphragm is required.
To facilitate inspection and replacement, the valve
layout is such that removal of the diaphragm can
be done without taking the valve out of the
chemical line.
Caution: Ensure the system is not under
pressure and that the chemical lines are
flushed with water before disassembly.
Unscrew the pressure adjustment screw to
remove the pressure from the diaphragm.
Unthread the valve top and lift off. After the
diaphragm has been inspected and replaced if
necessary; check the adjustment spring. Make
sure there is no rust or corrosion. Replace the
spring if needed. Place the spring and support disc
onto the valve, then thread the valve top back over
the valve body. Hand snug then tighten 1/8 of a
turn. (appx. 25 ft/lbs)
Turn the adjustment screw clockwise to
approximately the same position as it was prior to
disassembly. If an exact pressure setting is
required or a different pressure is desired a
pressure gauge should be used to verify the
setting.
Turning the adjustment screw clockwise
will increase pressure.
DIMENSIONS:
A
C
B
D
Only on 3 Port
Pres sure Relief Valve
D A (in) B (in) C (in)
1/4” (P) 3.90 2.340 0.750
1/4” (M) 3.50 2.340 0.750
3/8” (P) 3.90 2.340 0.750
3/8” (M) 3.50 2.340 0.750
1/2” (P) 4.60 2.340 0.750
1/2” (M) 4.20 2.340 0.750
Warranty:
GRIFFCO Valve, Inc. warrants its products against defects in workmanship or materials for one year under normal use or 18
months from date of shipment whichever occurs first. All obligations and liabilities under this warranty are limited to repair or replacement (at out
option), FOB our plant such allegedly defective units as are returned to our factory transport prepaid. Repairs or replacements are made subject to
inspection of returned items.
Note: “P” denotes Plastic body type, “M” denotes metal
This warranty does not extend to damage by corrosion or erosion. The materials of construction offered are recommendations subject in all cases to
acceptance by the customer. These recommendations, based on previous experience and best available information, do not constitute guarantees
against wear or chemical action. Expressly excluded from this warranty are defects caused by misuse, abuse or improper application, installation or
operation of the unit. No liability for consequential damages or reinstallation labor is accepted. GRIFFCO Valve, Inc. will not assume responsibility for
contingent liability for alleged failure of its products.