Demand Regulator: See Figure 6-27. The two-
stage demand regulator delivers vaporized LPG to
the carburetor.
The
primary stage receives LPG va-
por (and liquid) at LPG container pressure and re-
duces it to approximately 1.5 psi
(1
0.3 kPa). The
secondary stage delivers LPG vapor at the rate de-
manded by the carburetor.
The regulator should require little attention if the
genset is operated regularly. Most problems are
due to:
• Hardened Diaphragms, Gaskets and
Valve
Seats: Diaphragms, gaskets and valve seats
tend to shrink and harden when a genset is
stored for long periods of time and may need to
be replaced.
.,
Impurities and Dissolved Oils
in
Liquid LPG:
Impurities can embed on valve seats causing
them to leak and oils can clog regulator pas-
SECONDARY fl
DIAPHRAG~~
SECONDARY
~
~~E
~
COMPONENTS
~
I
INLET PORT
(Beginning Spec
F)
~
sages, resulting
in
hard starting, erratic idling
and poor load acceptance.
Primary Pressure
Test:
1.
Connect a pressure gauge to the primary pres-
sure test port and a source of compressed air
(at least 80 psi [550 kPa]) to the inlet port.
2.
The gauge should indicate approximately 1.5
psi
(1
0.3 kPa) and hold steady when the test
pressure valve is opened. The pressure should
not drop off when the test pressure valve is
closed.
3.
Disassemble and clean and retest the regula-
tor if it cannot hold the proper pressure. Re-
place it if it still does not function properly.
14wARNINGI Parts cleaning
solvents
are
flammable
and
corrosive
and
can cause
burns
and
inflammation.
manufacturer's instructions.
Follow
the
~'
i
'l
-----
PRIMARY
VALVE
1
'
I~
I
cJ:?
'
I
'
I
'
I
I
'
I
I
'
i~
r .
PRIMARY
GASKET2
PRIMARY
PRESSURE
TEST
PORT
PLUG
.
"'
I
~·
'
..___________
~
ta
PRIMARY VALVE
PLUNGER AND
SPR!NG
1
INLET PORT
(Prior to
Spec
F)
1- Beginning Spec
F,
the primary va!ve
plunger serves a!so as the primary valve.
The separate part labeled "PRIMARY
VALVE" is no longer provided.
2- Make sure the smailest ho!e in the gas-
ket
lines up with the small hole for the test
Flip the gasket over
if
necessary.
I
I
1
FIGURE 6-27. DEMAND REGULATOR
ASSEMBlY
6-30.
PRIMARY
DIAPHRAGM
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