Masoneilan 51/52/53 Series Cylinder Actuator | 23
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No air pressure is required to the actuator since the spring force acts to open the valve.
No air pressure is required to the actuator since the spring force acts to open the valve.
4. Loosen and remove the four Hexagon Bolts (24) and Split Clamp.
Do not allow the valve plug to drop into the seat ring, since this can damage both parts.
Take care in handling the actuator to prevent damage to gauges, tubing, and component parts.
5. Remove the Indicator Arm (23) and the Split Clamp (22).
6. Loosen and remove the valve mounting hardware and remove the actuator from the valve body.
Air to Retract (Model 53) With/Without Handwheel
Since removal of the valve plug stem from the split clamp requires that the valve plug be off the seat, special provisions
are necessary to assure that the valve is in the opened position. Proceed as follows for an actuator without a handwheel.
1. The handwheel must be in the AUTO position, and the air supply to the actuator must be shutoff (see
“Switching from Manual Operation to Auto Operation Mode” on page 15).
2. Disconnect air supply piping to the actuator.
3. Connect a controlled pressure source to the Yoke (1) air supply connector.
Since air supply piping connected to the actuator is normally rigid, it is recommended that a
controlled pressure source with suitable flex tubing be used or flex connections be made between
the supply piping and the actuator connection to accommodate movement of the actuator.
High stress placed on rigid piping can cause breaking of the air supply line. A flex connector is recommended.
During assembly or maintenance, and under operation in some conditions the operators or technicians
must be alert and aware of all possible pinch points or areas where there are moving or sliding components.
