Locking Mechanism - Emerson Fisher 1051 Instruction Manual

Size 33 diaphragm rotary actuators

Instruction manual (36 pages)

Instruction manual (32 pages)

Table of Contents

Instruction Manual

D101322X012

The handwheel assembly is attached to a special upper diaphragm casing (key 1, figures 9 and 10) with cap screws

(key 141). A hex nut (key 137) locks the handwheel in position. For field installation of a handwheel, the special upper

diaphragm case must be ordered as well as the handwheel.

Turning the handwheel (key 51) clockwise into the upper casing forces the pusher plate (key 135) against the

diaphragm and diaphragm plate (keys 3 and 4) to compress the spring (key 11, figures 9 and 10) and move the

diaphragm rod downward. Turning the handwheel counter‐clockwise allows the actuator spring to move the

diaphragm rod upward. If the valve is push‐down‐to‐close, full opening can be restricted by positioning the handwheel

at the desired position. If the valve is push‐down‐to‐open, full closing of the valve ball or disc can be restricted by use

of the handwheel.

Instructions are given below for complete disassembly and assembly required for inspection and parts replacement.

Disassembly

WARNING

To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing away from the

actuator, relieve spring compression before diaphragm casing bolting is loosened.

1. Remove the upper diaphragm casing (key 1, figures 9 and 10) by following steps 1 through 5 of the disassembly

portion of the Replacing Diaphragm procedure.

2. Remove the cotter pin, hex nut, handwheel, and locknut (keys 247, 54, 51, and 137). Unscrew the stem (key 133)

out through the actuator end of the handwheel body (key 142).

3. Remove cap screws (key 141), and separate the handwheel assembly from the upper casing.

4. Check the condition of the O‐rings (keys 138 and 139); replace them if necessary.

5. If it is necessary to remove the pusher plate or spacer (key 135 or 171), drive out the groove pin (key 140).

Assembly

1. Before assembling, lubricate the thread of the stem (key 133) with anti‐seize lubricant (key 244). Lubricate the

bearing surfaces of the stem and pusher plate (key 135) with lithium grease (key 241).

2. If the pusher plate or spacer was removed, attach them to the stem and drive in a new groove pin (key 140).

3. With the O‐ring (key 138) in place, thread the stem into the handwheel assembly.

4. Attach the handwheel assembly to the upper diaphragm casing (key 1, figures 9 and 10) with cap screws (key 141).

5. Install the locknut, handwheel, hex nut, and cotter pin (keys 137, 51, 54, and 247).

6. Install the diaphragm casing, making certain the warning tag is in place on the casing flange.

7. Tighten the cap screws (key 5, figures 9 and 10) evenly in a crisscross pattern (see table 2).

8. Adjust the initial set as described in the Spring Compression Adjustment procedure.