Page 4 of 6
GFH20-IOM 05/16
WARNING - TECHNICAL DATA SUBJECT TO EAR CONTROLS
THIS DOCUMENT CONTAINS TECHNICAL DATA WHOSE EXPORT IS RESTRICTED BY THE EXPORT ADMINISTRATION ACT OF 1979, AS AMENDED
(TITLE 50, U.S.C., APP. 2401, ET SEQ.) VIOLATION OF THIS EXPORT CONTROL LAW IS SUBJECT TO SEVERE CRIMINAL PENALTIES.
Symptom:
Noisy operation.
Potential Causes:
Turbulence in adjacent piping.
Repair:
Insure that there are no elbows, line tees or
other turbulence creating piping directly upstream or
downstream of the pressure regulator.
Symptom:
Excessive air consumption.
Potential Cause:
Wear to diaphragm assembly.
Repair:
Replace diaphragm assembly.
FIGURE 2 – Cross Section of GFH20 Regulator
REPAIR AND MAINTENANCE
WARNING:
To prevent equipment damage or injury,
insure that all system pressure is relieved and the supply
valve for this regulator is secured in the off position.
Cleanliness is critical to successful maintenance and
repair of this product. Perform all repair work in a clean
environment, with clean tools, and the correct materials
and supplies.
Tools and Materials Required:
1. A vise, or other suitable fixture, to secure the
regulator.
2. A Phillips torque screwdriver
3. A torque wrench with a 5/8” socket
4. Lint free swabs or wipes to clean components
DISASSEMBLY
1. Secure the body of the regulator.
2. Turn control knob (1) counterclockwise until the
range spring (7) is unloaded.
3. Remove the six screws (4) holding the bonnet (5)
to the body (12).
4. Remove the bonnet (5).
5. Remove the spring button (6) and spring (7).
6. If present, remove the restricting plate (8).
7. Remove the diaphragm SA (9).
8. Remove the baffle plate (10).
9. Loosen the nozzle retaining nut and remove the
nozzle (11).
10. Remove the dripwell (22) by unscrewing the cap
nut (24) and pulling downward away from the body
(12).
11. To remove the filter remove the filter spring (21)
and the filter plate (19) with attached grommet
(20).
12. To remove the bowl o-ring remove the retaining
plate (16).
13. Remove the cap nut o-ring (23) from the groove in
the cap nut (24)
ASSEMBLY
1. Replace worn or damaged components with new
components.
2. Clean and inspect components for reuse. Sealing
surfaces must be smooth and free of wear or
scratches.
3. Replace the o-ring (23) around the cap nut (24).
4. Place the bowl o-ring (15) on the o-ring groove of
the body (12).
5. Insert the retaining plate (16) into the body (12).
Place the filter (18), filter plate (19) with attached
grommet (20) and filter spring (21) onto the post
sub-assembly (17).
6. Slide the bowl (22) onto the body until it is firmly
seated against the bottom of the body (12).
7. Slide the o-ring (23) onto the cap nut groove and
screw into the bottom of the bowl (22) until it is
finger tight. Insure that the bowl is seated against
the bottom of the body.
8. Install the nozzle SA (11) into the body and torque
the nozzle retaining nut to 100 in. lbs.
9. Ensure that the baffle plate (10) is installed in the
groove in the body (12) before installing the
diaphragm SA (9). Install restricting plate (8) if
present.
10. Place spring (7) and spring plate (6) on to
diaphragm.
11. Place bonnet (5) onto body lining up holes in body
and diaphragm SA
12. Install the 6 bonnet screws (4) and torque in a star
pattern to 32 inch pounds.
