Griffco Valve M-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 were
designed with minimizing the amount of maintenance
required to keep the valves in operation. However,
periodic replacement of the diaphragm is required. A
parts kit can be purchased from your local Griffco Valve
distributor. 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 spring. Remove the 4 bolts and lift off
the valve top.
Inspect the valve seat and diaphragm, replace the
diaphragm if necessary (White PTFE side down). Check
the adjustment spring to make sure there is no rust or
corrosion, replace if necessary. Place the support disc
and the spring onto the diaphragm and place the top
back over the four bolt holes.
Tighten the 4 bolts, and then replace the adjustment
screw. 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:
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.
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.
D A (in) B (in) C (in)
1/4” (P) 3.55 2.35 0.75
1/4” (M) 3.55 2.35 0.75
3/8” (P) 3.55 2.35 0.75
3/8” (M) 3.55 2.35 0.75
1/2” (P) 4.25 2.35 1.08
1/2” (M) 4.25 2.35 1.08
Note: “P” denotes Plastic body type, “M” denotes
metal