Instruction manual

Instruction Manual

D100322X012

1052 Size 20 Actuator (F & G)

February 2011

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this

instruction manual.

CAUTION

To avoid parts damage, do not use an operating pressure that exceeds the Maximum Diaphragm Casing Pressure (table 1)

or produces a torque greater than the Maximum Allowable Valve Shaft Torque (see Catalog 14). Use pressure‐limiting or

pressure‐relieving devices to prevent the diaphragm casing pressure from exceeding its limit.

The actuator, as it comes from the factory, is normally mounted on a valve. Follow valve instructions when installing

the control valve in the pipeline.

A 1/4 NPT pressure connection is located on top of the actuator. Run either 1/4 NPT pipe or 3/8 inch tubing between

the pressure connection and the instrument. Keep the length of tubing or pipe as short as possible to avoid

transmission lag in the control signal. If a valve positioner is used, the pressure connection to the actuator will

normally be made at the factory.

When the control valve is completely installed and connected to the actuator, check it for correct action (air‐to‐open

or air‐to‐close) to match the controlling instrument. For successful operation, the actuator stem and valve shaft must

move freely in response to the loading pressure change on the diaphragm.

Use the following steps to connect a valve and an actuator that have been ordered separately. Because the procedures

in the Mounting Procedure section require removal of initial spring compression, it is necessary to read the Spring

Compression Adjustment section before completing the installation.

Mounting Procedure

This procedure assumes that the style ordered from the factory (A, B, C or D) was correct. Key numbers refer to figure

1. Remove the positioner if one is used, and unscrew machine screws (key 40) to remove the positioner bracket or the

cover (key 39).

2. Consult figure 2 for available mounting styles and positions. The actuator is normally mounted vertically with the

valve in a horizontal pipe run.

3. Ensure all the initial spring compression has been removed from the spring. To relieve spring compression, insert a

screwdriver blade between the notches at the base of the spring adjusting screw (key 74) as shown in figure 3. Push

the tip of the screwdriver blade to the right. This rotates the spring adjusting screw counterclockwise. Continue

until the stop is reached which occurs when the spring seat (key 13) is lowered to the adjusting screw base.

4. Before sliding the valve shaft into the lever, position the valve as follows:

D For push‐down‐to‐close action, the valve should be fully open.

D For push‐down‐to‐open action, the valve should be fully closed (see the valve instruction manual).

5. Position the lever in the housing to align with the holes at each end of the housing. Compare the position of the

lever to the position shown in figure 2. Notice that when the lever is in the correct position to receive the valve

shaft, the ”down” travel stop is nearly vertical, as shown in figures 3 and 5.