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Baker Hughes
Copyright 2021 Baker Hughes Company. All rights reserved.
Introduction
The following instructions are designed to assist maintenance personnel in performing most of the
maintenance required on the Model 51/52/53 cylinder actuator. Baker Hughes has highly skilled service
engineers available for start-up, maintenance and repair of our actuators and component parts. In addition,
a regularly scheduled training program is conducted at the Training Center to train customer service and
instrumentation personnel in the operation, maintenance and application of our control valves, actuators
and instruments. Arrangements for these services can be made through your Baker Hughes representative
or sales office. When performing maintenance, use only Masoneilan replacement parts. Parts are available
through your local Baker Hughes representative or sales office. When ordering parts, always include Model
and Serial Number of the unit being repaired.
Installation
Unpacking
Care must be exercised when unpacking the equipment to prevent damage to the accessories and component
parts. If any problems or difficulties arise, contact your Baker Hughes representative or sales office.
Pneumatic Supply Connections
blThe Model 51/52/53 actuator is designed to accept 3/4” NPT air supply connections. Accessories
supplied with the actuator are mounted and connected at the factory.
General
These installation and maintenance instructions apply to the Masoneilan Model 51/52/53 cylinder actuator
regardless of the valve body on which it is used. Actuator part numbers and recommended spare parts
required for maintenance are listed in Table 5 on page 13. The model number and action of the actuator is
shown as part of the model number listed on the identification tag located on the actuator.
Actuator Description
The Model 51/52/53 is a pneumatic cylinder actuator available in double acting spring-less and spring-
return configurations. The double acting version can be configured with a volume chamber directly attached
to the cylinder to provide a failsafe operation in the event of supply pressure loss. The spring-return version
includes a spring cartridge subassembly. The spring is pre-compressed within the cartridge subassembly
prior to assembly into the cylinder. This subassembly also provides guiding support and is isolated from the
pressurized pneumatic section. This design provides reliability and maintainability.
Actuator Type
51
Double Acting (No springs)
52
Air to extend (Extend stem)
53
Air to retract (Retract stem)
Table 2 - Numbering Schema
