MAN-2V3B-4.1V REV (B)
18
7.4.3
3RD STAGE VALVE ASSEMBLY
VALVE
REMOVAL
a.
Remove gas inlet and discharge lines from head. Remove the two nuts. Remove the plug
from the center top of head. Lift off head.
b.
Remove the first o-ring. Be careful not to scratch the inside surface of the head. Remove
the suction valve stop and suction valve. Remove pin from valve seat, being careful not
to bend.
c.
Remove the second o-ring. Then, using a soft rod or punch inserted through the
discharge head port, tap out the valve seat. N
OTE
: Normally, step "b" can be skipped,
and the entire assembly can be pushed out together.
d.
Remove the third o-ring and discharge reed valve. Remove upper pin from head.
e.
Inspect and repair or replace parts as necessary. All o-rings must be replaced.
VALVE
INSTALLATION
Note: Before final assembly it can be helpful to do a trial assembly without the o-rings in place.
a.
Apply a light film of oxygen compatible grease to the new o-rings and to the outside
cylindrical surface of the valve seat (not the flats).
b.
Place the pin in the head. Set the discharge valve over the pin in the head and place the
first o-ring in the valve pocket. Refer to applicable drawing for proper orientation of the
valve and reeds. N
OTE
: if either reed is installed upside down, the valve will not be able
to open properly.
c.
Install the valve seat with the pin hole in the discharge side of the seat aligned over the
pin in the head. Look thru the suction port in the head to check that the pin has engaged
the hole in the seat and the seat is inserted all the way to the bottom of the head. Drill
bits or needle nose pliers can be used to help install and orient the valve seat, though only
by holding the seat by the discharge holes (these are located in the recessed area).
Warning: Use of pliers in the suction holes will damage the valve seat!
Note
: After seat installation both suction and discharge holes must be visible or seat is in
backwards. Proper installation of discharge reed can be checked by attempting to blow
into discharge port. No air should pass if valve and seat are correctly installed.
d
Install the second o-ring, second pin and the suction reed. Be careful to orient the reed
correctly with the seat.
e.
Install the valve stop and the third o-ring.
f.
Reinstall the head and tighten in 5 ft-lb. increments to 15 ft-lbs (lubed threads).
CAUTION
The nuts holding the head in place must be removed and installed using an alternating pattern. Verify
the head is on square and not cocked. Overtightening may damage the valves and/or head.
Содержание RIX 2V3B-4.1V Series
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