12
r
70%
75%
F, G, K, N, T
60%
65%
H
55%
60%
J, L, M, Q
45%
50%
P
35%
40%
Anderson Greenwood
SerieS 5200 POSrV
InstallatIon and MaIntenance InstructIons
Pilot
Backflow
check valve
Field-test
connection
pressure source
Drain
fitting
Main
valve
in
HV
Gas
Dome
exhaust
inlet
integral sense (optional)
remote sense
(standard)
Field test
indicator
Condensate
trap
Field test
connection
5 VAlVe AsseMbly
reinstall the pilot to the bracket using the
two studs and nuts. reinstall the condensate
trap using the U-bolt and nuts. reinstall the
fittings and tubing between the main valve,
pilot, condensate trap, field test (if applicable)
and sense ring (if applicable). See Figure 9 for
tubing schematic.
6 pIloT pre-seT pressure AdJusTMenT
6.1 definitions, pilot only
Set pressure is the test pressure at which the
pilot reduces the dome pressure to 'A' ± 2% of
set pressure (refer to Table 6 for the value 'A').
Cracking pressure is the test pressure at which
first leak occurs at the pilot exhaust port on
increasing pressure.
TAble 6 – reseAT pressures And doMe pressures (VAlue As % oF supply pressure)
orifice
dome pressure 'A'
reseat pressure 'b'
6.2 set pressure, pilot only
The pilot can be pre-set and checked for
leakage using air on a test set up similar to
that shown in Figure 10. Final setting is to be
performed on steam.
The adjustment screw should be turned iN
most of the way. increase the supply pressure
to nameplate setting and slowly back out
the adjustment screw until flow through the
pilot exhaust begins. Continue to back out the
adjustment screw slowly until dome pressure
is per Table 6 (Dome pressure 'A') and the
test pressure meets the required set pressure
tolerance of section 7.5. After adjustment is
completed, securely tighten the jam nut.
To determine reseat pressure, shut off the
test pressure supply and use the accumulator
vent valve to reduce the supply pressure slowly
until the dome pressure is per Table 6 (reseat
pressure 'B').
Close the shut-off valve and open the bleed
valve slowly. When the dome pressure gauge
reading is zero, the pilot may be removed from
the test set-up.
reseat pressure is that supply pressure where
the dome pressure equals to 'B' ± 2% of set
pressure (refer to Table 6 for the value 'B').
Dome pressure is the pressure at the dome
connection of the pilot valve.
FiGUre 9 - TUBiNG
