Bettis Manual: GENERAL OPERATING & MAINTENANCE INSTRUCTIONS FOR -12 TRIM SERIES ACTUATORS | Bettis Manuals & Guides

GH BETTIS

GENERAL

OPERATING & MAINTENANCE INSTRUCTIONS

FOR

-12 TRIM SERIES ACTUATORS

PART NUMBER 71584

REVISION "A"

DATE: JULY 1987

ECN DATE REV LTR By * Date

A9280 07/15/87 A Compiled

Checked
Approved
Approved

* Signatures on file Bettis, Waller, Texas

BSC 07-16-87

BC 07-20-87
RTU 08-07-87
AJP 08-07-87

GH Bettis P/N 71584

Page 1 of 3

1.0 GENERAL

GH Bettis rotary actuators are designed for use with rotary valves of a

broad range of sizes and types, and are applicable over a wide range of
pressures, temperatures and environments.

2.0 STORAGE

For applications where the actuator is not put into immediate service it

is recommended that the actuator be cycled by clean dry air or nitrogen
pressure at least once per month. Indoor storage, if available, is
recommended for all actuators. Care should be taken to plug the cylinder
ports, control valves ports and body parts to keep out foreign particles
and moisture. Also, actuators should not be stored in an atmosphere
harmful to resilient seals. For extended storage, contact factory.

3.0 INSTALLATION

3.1 Since there are many valves and actuator combinations, it is not
practical to include detailed instructions for each type. Mountings
are designed to be as simple as possible to keep guess work out of
installation. Actuators are shipped from the factory with the travel
stops adjusted for approximately ninety degree rotation. Generally
it is necessary to make slight stop adjustments once the actuator is
installed on the valve. Refer to the valve manufacturer's
recommendations for specific requirements. When the valve has
internal stops, the actuator should be adjusted at the same points.
NOTE: The actual "stopping" should be done by the actuator. If the
valve does not have internal stops, adjust the actuator to the full
open position. Using this as a reference point, rotate the valve
closed and adjust to the valve manufacturer's specifications for
total rotation.

3.2 Good instrument practices are also recommended. Clean, dry air or
gas is essential for long service life and satisfactory operation.
It should be noted that new air lines often have scale and other
debris in them. This debris can damage control valves, solenoids,
seals, etc..

4.0 START-UP

4.1 When actuator is first put into service it should be stroked with
pneumatic pressure. This is necessary because the seals and
packings have been stationary, causing them to take a "set".
Therefore, the actuator should be operated through several cycles,
exercising the seals and packings, resulting in a service ready
condition.