Table of Contents
Advertisement
Installation, Operation and Maintenance Manual
DOC.IOM.BRX.EN Rev. 2
Section 6: Maintenance
6.1
Maintenance
Under normal operating conditions and when basic pneumatic system maintenance
procedures are applied, the Bettis RPX Actuator will require minimum maintenance for
hundred thousands of cycles.
If O-rings wear out and air leakage occurs, a soft goods kit can be ordered. Please use
the (dis)assembly routines as described in this document. Carefully inspect all other
components for wear and replace if required.
6.2
Troubleshooting
If the actuator fails to operate the valve correctly, carry out the following checks:
1.
2.
3.
4.
5.
6.
NOTE:
1.
2.
6.3
Pneumatic Air Connection
The Bettis RPX Actuator has 2 pieces of 1/4" BSP or NPT air connections which can be used
for tube connection. Alternatively, it is possible to mount a NAMUR solenoid valve directly.
Comments:
1.
2.
3.
Maintenance
Check that the air supply is at the required pressure.
Ensure that the air supply is not restricted in any way.
Check for air leakage on supply lines to the actuator.
Check for air leakage at the top and bottom of the pinion shaft.
Check for air leakage across the piston seals by applying pressure to port 4 (B)
and looking for leakage from port 2 (A) and/or reverse.
Check that the valve torque has not increased due to problems with the valve itself.
Refer to disassembly and assembly procedures for gaining access to O-rings and
actuator internals if required.
Reduced stroke i.e. valve not traveling the required stroke or "backlash" may be
caused by an incorrect fit between output bore and valve stem.
As standard, applying air to port 2 (A) will cause the actuator to rotate in a counter
clockwise (CCW) direction to open the valve.
For Double-Acting applications, applying air to port 4 (B) will cause the actuator
to rotate in a clockwise direction to close the valve.
Single-Acting (also called Spring-Return) actuators should not be "air assisted"
as this will apply excessive load to the valve stem and cause damage.
Section 6: Maintenance
May 2021
17
Advertisement
Table of Contents
