Instruction Manual
D103799X012
685SE/685SR Piston Actuator
September 2014
12
cylinder assembly to screw the engage/disengage block (key 43) onto the piston rod (key 17) until the gap
measured in step 2 is achieved.
35. Tighten the set screw (key 36) into the engage/disengage block (key 43).
36. Securethecylinderassemblytotheyokeusingthehex head cap screws (key 20) and lock washers (key 10).
Torque in a crisscross pattern according to table 8.
37. Refer to the Actuator Mounting section of this manual for instructions on mounting and installing the actuator
onto a valve.
Table 8. Tie Bolt Torque
BOLT DIAMETER
TORQUE
N•m lbf•ft
1/420 8 6
5/1618 15 11
3/816 26 19
7/1614 39 29
1/213 60 44
9/1612 84 62
5/811 115 85
3/410 198 146
7/89 313 231
18 445 328
11/87 662 488
685SR Seal and O-ring Replacement
The following procedure is for the replacement of the internal piston seals, bearing seals, and O-rings.
1. Complete Actuator Removal procedures above. Using the same rigging and lifting points as in the Actuator
Removal section, place the actuator upright with the yoke (key 21) flat against the ground. Place either a flat piece
of plywood or cloth under the yoke to protect against damage. Using straps, secure the actuator to a solid structure
to prevent it from falling over.
If the actuator has a handwheel manual override proceed to step 2, otherwise proceed directly to step 6.
2. Measure the gap between the piston rod (key 17) and the engage/disengage block (key 43) — up to 1/8 inch — and
make note as this will be used during reassembly.
3. Removethesetscrew(key36)fromtheengage/disengageblock(key43).
4. Remove the hex head cap screws (key 20) and lock washers (key 10) that secure the yoke (key 21) to the lower head
(key 9).
5. Using the same lifting eyes as in the Actuator Removal section, attach appropriate rigging gear and remove the
cylinderassemblyfromtheyoke(key21).Therigginggearshould allow the cylinder to be rotated freely. Rotate the
cylinder assembly to unscrew the engage/disengage block (key 43) from the piston rod (key 17). After the
engage/disengage block is removed, secure the cylinder assembly to the yoke using the hex head cap screws (key
20) and lock washers (key 10).
6. Loosen tie bolt hex nuts (key 11) in a crisscross pattern. Remove tie rod hex nuts and lock washers (key 10).
7. Using the same lifting eyes as in the Actuator Removal procedure, lift or hoist the upper head (key 1) off of the
cylinder (key 4). Place the upper head onto wooden blocks or other material that will not cause damage with the
Oring side facing up.
8. Remove Oring (key 2) from the upper head (key 1) and clean the seal groove. Install lightly greased new Oring into
upper head seal groove.
9. Remove tie bolts (key 3) from lower head (key 9).
(28 strony)
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