Pentair ANDERSON GREENWOOD 95 POSRV, Maintenance Instructions Manual

Page: 10 / 10

ANDERSON GREENWOOD TyPE 95 POSRV
MAINTENANCE INSTRUCTIONS
page 10 ANGMC-6026-US-1312 Copyright © 2013 Pentair
Engineering Doc. #05.9040.083 Rev. E
7.0 VALVE DIAGNOSIS GUIDE
Problem Causes
Valve does not close (Refer to Figure 1)
on start-up with little or Main valve piston in lift position,
no cargo tank pressure pressurize dome through field test
handvalve [0.5 to 1.0 kp/cm
2
] to
close piston.
Valve opens at a Set pressure incorrect
pressure below
nameplate set pressure Auxiliary setter device incorrect
one for valve.
Auxiliary setter device not screwed
down all the way.
Pilot sense diaphragm leaks. Check
for gas flow through pilot spring
bonnet vent.
Backflow preventer check valve
leaks. (Item 15, Figure 2) Check
for gas flow at discharge tube to
main valve outlet. No gas flow
should be detected.
Valve opens at Pilot not sensing correct tank pressure
correct pressure
but does not close Check valve in tank pressure sense
line (Figure 1) restricted.
Filter screen in pilot or small orifices
in pilot restricted.
IMPORTANT
IN AN EMERGENCy, MAIN VALVE
CAN BE CLOSED By PRESSURIZING
DOME (TOP OF PISTON) THROUGH
CLOSE TEE (ITEM 13, FIGURE 2) REMOVE
PLUG (ITEM 18) AND APPLy PRESSURE
EQUAL TO TANK PRESSURE.
8.0 REPAIR KITS
Soft goods Bolt
Main valve size kit part number kit part number
2 x 3 04.4744.810 04.4744.330
3 x 4 04.4744.804 04.4744.331
4 x 6 04.4744.834 04.4744.332
6 x 8 04.4744.835 04.4744.333
Pilot 04.4744.025 04.4744.333
Backflow preventer (diaphragm) 04.4744.781 04.4744.335
Check valve (ball check) 04.4744.782 None