Mooney Series 20 Relief Valve Instruction Manual | 9
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Mounting Option C (Figures 6 & 8)
1. Remove tubing between the field test connections (B) and
tee (C), leaving NPT connections in place.
2. Place tubing plug (provided) on exposed tubing connection
on tee (C).
3. Connect remote sense location upstream of the valve to the
field test connection (B) via new tubing (A).
Figure 8
Startup and Operation
Ensure all stop valves are
open before attempting to
start the system with the
relief valve installed.
WARNING:
Ensure the Type 25 restrictor (rounded body) is
used. Attempting to operate the relief valve with the Type 24
restrictor (square body) will result in poor performance and/or
failure to operate.
CAUTION:
Adjustment of the restrictor affects the response rate,
stability, and sensitivity of the main valve. The recommended
and factory setting is “2”.
1. For optimal results, ensure the Type 25 Restrictor is set to
“2”.
2. Increase pilot spring compression to the maximum limit or
some margin above the desired setting.
3. If installed, open hand valve(s) in the sense line, and the
pilot supply line.
4. Ensure the system downstream of the relief valve is ready to
accept flow.
5. Slowly open valve upstream to pressurize the relief valve.
a. The relief valve should lock-up with zero pressure/flow
downstream.
6. If an auxiliary bottle is used (recommended),
a.
Slowly decrease pilot spring setting until flow is
achieved
i. The flow may only be through the pilot.
ii. If the system is instable, adjust the restrictor to a
higher setting to achieve a more stable flow.
7. Slowly adjust the pilot spring setting until the desired set
point is achieved.
a. Firmly tighten down locknut to pilot closing cap.
General Planning
for Maintenance
A 12 month maintenance interval is recommended for general
service conditions. For severe service applications, a more
frequent inspection and testing interim may be more appropriate.
Applicable industry regulations and the specific company’s
operating and service history will better determine this frequency.
GE encourages preventive maintenance.
The Mooney Series 20 Relief Valve is easily maintained.
Normal Maintenance usually involves:
• Removal of pilot valve from main valve
• Disassembly of both the pilot and main valve
• Cleaning
• Component inspection
• Parts replacement (as needed)
• Reassembly
• Setting and testing
Improper use or repair
of a pressurized device
may result in severe
personal injury or death.
Improper tools or im-
proper use of the right
tools could result in
personal injury or
product damage.
