Swagelok LPRS4 Series, User Manual, Page: 19 / 24

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RS Series: Piston Sensing, Self-venting Option
1. Follow steps 1 through 7 of the RS series standard diaphragm sensing reassembly procedure.
2. Fit the self-vent seat O-ring (33) over the self-vent seat (32) then insert the seat into the self-vent piston
(14). Ensure the chamfered edge of the seat is facing out.
3. Insert the piston O-rings (17) and piston backup rings (18) into the self-vent plate (35). Ensure they are
oriented correctly per Fig 7.
4. Lightly lubricate the piston O-rings (17) then insert the piston (14) into the plate (35).
5. Place the piston plate O-ring (15) into the body (10) then fit the piston plate assembly, aligning the vent
port as desired.
6. Place the bottom spring guide (13) onto the piston (14).
7. Follow steps 11 through 14 of the RS series standard diaphragm sensing reassembly procedure.
LPRS Series
1. Follow steps 1 through 7 of the RS series standard diaphragm sensing reassembly procedure.
2. Place the diaphragm (12) onto the diaphragm plate (11) then insert the diaphragm screw (34) through the
plate per Fig 9. Lightly lubricate the diaphragm screw threads (34).
3. Secure the assembly with the diaphragm nut (38) and washer (37). Torque to 7 lbf·ft (10 N · m).
4. Place the diaphragm assembly in the body (10) on top of the poppet (7). Align the holes in the diaphragm
(12) with the holes in the body (10).
5. Follow steps 11 and 12 of the RS series standard diaphragm sensing reassembly procedure.
6. Lightly lubricate the cap screws (25). Fit the spring housing (23) over the spring (20) and secure with the
cap screws (25), washers (24) and cap nuts (36). Torque to 11 lbf·ft (15 N·m).
7. Follow step 14 of the RS series standard diaphragm sensing reassembly procedure.