Repair and Adjustment Procedures for
C-1801 Pneumatic Operators
3
D. REPLACING THE STEM SEALS
1. Remove and disassemble the operator in accordance with Sections A and B.
2. Place an
¹⁄₈
" allen wrench in the end of the valve & stem assembly (19). Hold the valve
stem in position with the allen wrench while removing the hex nut (15) with a
⁷⁄₁₆
" wrench.
3. Remove the washer (16), piston (8), diaphragm (9), washer (17), and remove valve and
stem assembly down thru threaded end of operator base.
4. Use snap ring plier to remove the upper seal retaining ring. Remove washer and quad
ring.
5. Turn the operator base (20) over so that the threaded end is up. Use snap ring pliers to
remove the lower seal retaining ring (13) from the operator base (20).
6. Remove the washer (12), lower quad ring (22), spring loaded stem seal (10), and the
spacer (11).
7. Install a new lower quad ring (22) and spring loaded stem seal (10) with the spacer (11)
between them. NOTE: The quad ring goes in first. The spring loaded stem seal should
be oriented so that the spring in the seal faces toward the valve.
8. Replace the washer (12) and the seal retaining ring (13).
9. Install a new upper quad ring (21) into its groove. Replace washer and seal retaining ring.
10. Push the valve and stem assembly (19) through the spring loaded stem seal (10), the lower
quad ring (22), and the upper quad ring (21). Turn the operator back over so the valve
points down.
11. Replace the washer (17), the diaphragm (9), the piston (8), washer (16), and hex nut (15).
Tighten the hex nut (15).
12. Assemble the pneumatic operator in accordance with Section G.
E. CHANGING THE OPERATOR SPRINGS
1. Remove and disassemble the operator in accordance with Sections A and B.
2. Place new spring (7) in the base of the operator (20).
3. Assemble the pneumatic operator in accordance with Section G.
F. CHANGING THE DIAPHRAGM
1. Remove and disassemble the operator in accordance with Sections A and B.
2. Place an
¹⁄₈
" allen wrench in the end of the valve & stem assembly (19). Hold the valve
stem in position with the allen wrench while removing the hex nut (15) with a
⁷⁄₁₆
" wrench.
3. Remove the washer (16) and piston (8).
4. Remove the diaphragm (9) and replace it with a new one. Be sure that washer (17) stays
in place underneath the diaphragm.
5. Replace the washer (16) and the piston (8).
6. Replace the hex nut (15) and tighten it.
7. Assemble the pneumatic operator in accordance with Section G.
G. ASSEMBLING THE PNEUMATIC OPERATOR
After the necessary repairs have been made, perform the following steps to assemble and
install the operator.
1. Place spring (7) in the bottom half of the operator assembly.
2. Screw the adjusting disc (6) onto the adjusting screw (3) until the disc (6) is tightened at
the end of the threads on the adjusting screw. See Figure 2-1 for the proper orientation of
the adjusting disc (6).
