Table of Contents
Advertisement
ANDERSON GREENWOOD TYPE 9300H POSRV
INSTALLATION AND MAINTENANCE INSTRUCTIONS
FIGURE 15
5 STORAGE AND HANDLING
Because cleanliness is essential to the
satisfactory operation and tightness of a 9300H
pilot operated relief valve, precautions should
be taken to keep out all foreign particles and
materials. Valves should be closed off properly
at both the valve inlet and outlet. Particular
care should be taken to keep the valve inlet
absolutely clean. Valves should preferably be
stored indoors with the original factory installed
protective measures left in place. This includes
all desiccants, flange protectors, and factory
seals. Valves should be placed on wooden
pallets or other blocking materials to keep them
off the floor or in a location where dirt and other
forms of contamination are kept to a minimum.
Valves should not be thrown in a pile or laid on
the bare ground waiting for installation.
Remote sense
connection
(to tank)
6 TROUBLE SHOOTING
Problem
Possible cause
1. Valve opens below set.
1. Improper installation of sense
line.
2. Plugged sense line.
3. Improper gauge accuracy and/
or location.
2. Pilot leaks from upper
1. Sense diaphragm failure.
vent.
2. Spindle lock nut loose.
3. Pilot leaks from lower
1. Pilot seat leakage.
vent.
2. Nozzle over tightened.
4. Main valve leaks.
1. Seat film damaged.
2. Nozzle damaged.
3. Nozzle seal damaged, missing,
or out of place.
5. Operating too close to set
pressure. (above 96%)
6. Possible main valve diaphragm
pin-holes
7. Internals Stack assembly loose 7. Tighten Internal Stack assembly Jam Nut
Flexible hose
Field test
valve "A"
Block
valve
Block valve "B"
"C"
Nitrogen
bottle
Resolution
1. Verify if sense line is installed properly.
2. Check sense line, inlet screen, and dipper
tube for cleanliness.
3. Verify gauge accuracy for valve being tested
and ensure location is at valve being tested.
1. Replace diaphragm.
2. Tighten spindle lock nut.
1. On the 93 pilot, replace spindle disc
assembly.
On the 93T and 91 pilots, replace seat.
Inspect nozzle and relap if necessary.
2. Tighten nozzle per assembly instructions.
1. Replace seat film.
2. Inspect nozzle and relap if necessary.
3. Position nozzle seal per assembly
instructions.
5. Lower operating pressure.
6. Replace diaphragm.
Test gage
24
Advertisement
Table of Contents
