ANDERSON GREENWOOD
TyPE 95 POSRV
MAINTENANCE INSTRUCTIONS
page 8
ANGMC-6026-US-1312
Copyright © 2013 Pentair
Engineering Doc. #05.9040.083 Rev. E
Type 95 pilot test set-up
5.0 PILOT SET PRESSURE ADJUSTMENT (REFER TO FIGURE 5)
To adjust the opening and closing pressure of the pilot after the pilot has been
completely disassembled and reassembled, a test set-up similar to that shown in
Figure 5 should be used.
5.1
Check the position of the blowdown adjustment screw. It should be turned half
way in (approximately 5 turns).
5.2
With the pressure adjustment screw turned most of the way in, increase the
supply pressure to the desired set pressure. Back the pressure adjustment
screw out until the pilot “snaps” open. The dome pressure should decrease to
25% or less of the supply pressure.
When the pilot opens and flows, the supply pressure will decrease due to the
pressure drop in the lines to the accumulator. The set pressure is the highest
pressure recorded on the supply pressure gauge.
5.3
Decrease the supply pressure to the correct reseat pressure and back the
blowdown adjustment screw out until the dome pressure “snaps” back. The
supply pressure at which this occurs is the reseat pressure and it should be
about 90% of the set pressure.
When the pilot reseats, the supply pressure will increase due to reduced flow
through the supply line. The reseat pressure will be the lowest pressure read
on the supply gauge. Tighten the jam nut after each setting for accurate readings.
Recycle the pilot valve to verify the settings. A small interaction between the
blowdown adjustment and the pressure adjustment will occur.
1
/
2
" [1.5 mm] pipe
Accumulator
(
1
/
4
Cubic Ft.)
Primary set
pressure
adjustment
under cap
Blowdown
adjustment
Dome
pressure
gauge
Vent
Supply
pressure
Supply
Supply port
Auxiliary set
pressure
adjustment
under cap
1
/
2
" [1.5 mm] pipe
6" to 12" long
FIGURE 5
