Installation, Operation and Maintenance Manual
RGS011110-1 Rev. 0
September 2015
10
Section 6: Maintenance
Operation
Section 6: Maintenance
6�1
Piston Seal Replacement
•
All Bettis RGS Q-Series actuator piston seals may be replaced while the
actuator remains in line.
—
This offers the advantage of not having to remove the actuator from the
valve and eliminates concern about valve damage as a result of having to
disengage the actuator and valve shafts.
—
It also is beneficial because accessory settings are not disrupted and
therefore should not require subsequent adjustment/calibration post
repair.
—
When pressure is exhausted form the pressure ports in preparation
for disassembly, the springs position the valve either open or closed as
defined during original installation. When the end cap and cylinder are
removed, the springs continue to hold the valve in this position.
—
Single and double-cylinder types require identical procedures for piston
seal replacement, except that for the double-cylinder types, complete one
cylinder prior to performing seal replacement on the second.
6�1�1 Procedure
1.
Exhaust pressure from all pressure ports.
2.
Remove tubing/piping.
3.
Measure height of travel stop adjustment screw.
Figure 14
Travel Stop Adjustment Screw
Travel Stop Adjustment Screw
