page 64 of 76
➨
Remove valve heads (O) along with the disc
springs (R), connection tube if applicable,
hose nozzles (P) and connection fasten-
ers (Q) or move the valve heads carefully
aside. Note position and orientation of the
valve heads.
☞
Note position and alignment of valves (N).
➨
Check valves (N) and O-rings (M) for damage and soiling.
➨
Replace valves or O-rings if necessary.
➨
Use petroleum ether or other industrial solvent to remove deposits. Do
not inhale vapors.
O
R
N
Q
➨
Insert O-rings (M) and valves (N). See fig
-
ure for the correct position of the valves:
☞
Inlet side (IN):
Marked ”IN” next to the valve seat. The
valve tongue points at the kidney-shaped
orifice in the valve seat.
☞
Outlet side (EX):
Marked with ”EX” next to the valve seat. The
valve is oriented the same direction as the
valve at the inlet side.
EX
IN
➨
Position valve heads (O), with hose nozzle
(P), if applicable, connection tube or con-
nection fastener (Q), and disc springs (R)
on the valve seats. Position disc springs
with large opening downwards. Pay atten-
tion to the correct orientation of the valve
heads.
☞
Center the valve head with respect to the
valve seat. The valve head must lie flat on
the valve seat.
M
N
O
R
Valve head with gas ballast or hose nozzle connection:
➨
Insert square nut (K) in the groove of the head cover (J) or position
square nut in the groove and then screw on connection fastener.
☞
Loosely fasten fillister head screw (L).
