18 | Baker Hughes
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Step 4.
Install all -012 O-rings (J) on inside (I) and outside
(F) pistons. Install washers (K) on all pistons. Grooves on the
washers must face the diaphragms.
Step 5
. Install convoluted diaphragms (L). Make sure they face
the direction shown.
Step 6
. Install washers (K) on the bottom and top of the
diaphragms (L) and fasten them with 1/2-20 jam nuts (N).
Torque jam nuts (N) to 140-160 in-lb.
Step 7
. Install 1/4-28 jam nut (M) and adjusting drum (P) in the
valve adjusting screw (F2). Connect the adjusting screw (F2)
and drum (P) with 5-40 x 1/4-inch SHCS (P2) as shown.
Note:
Jam nut (M) should touch the drum (P). This will allow free
drum rotation for adjustment.
Assembly Procedures
Note:
During assembly, moisten all O-rings, threads, thrust
bearings and the recess in the spring seat with lightweight
silicone grease.
Take special care to avoid applying grease to the diaphragm
sealing surfaces, as this may compromise diaphragm sealing.
Step 1
. Install –010 O-rings (A) on nozzles (B) and install
nozzles into the top and bottom of the body (C).
Step 2.
Press fit seat (E) into outside piston (F). Make sure the
seats are bottomed in the cavities. Tap them down if necessary.
The properly installed seat rises 0.005 inch to 0.020 inch above
the piston surface.
Step 3
. Attach the outside piston (F) to the pilot posts (G) with
8-32 x 1/2-inch SHCS (H). Install O-rings -014 (H1) in the valve
adjusting screw (F2). Press fit the seat (E) into the valve adjust
-
ing screw (F2). Then install the assembly into the inside piston
(I) and connect it to the posts (G) with 8-32 x 1-inch SHCS (H2).
