Type 87/88 Pneumatic Diaphragm Actuators

Multi-Spring Diaphragm Actuator

The 87/88 multi-spring diaphragm actuator is the standard pneumatic actuator design provided with Dresser Masoneilan reciprocating control valves. It is available in four standard sizes with multiple spring ranges to meet a wide range of applications. The standard maximum stroke available is up to 2.5" (64 mm) and can be provided in either air-to-extend or air-to-retract configuration depending on desired fail safe action.

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Selection Criteria

The 87/88 Multi-Spring Diaphragm actuator is the primary pneumatic actuator offered by Dresser Masoneilan for reciprocating and linear motion control valves for strokes up to 2.5" (64mm). Selection of the proper size and spring-range is dependent upon valve type, operating service conditions and valve shut-off leakage class requirements.

Key Features

Key features of the 87/88 Actuators include a rolling diaphragm design, multiple spring construction and various spring range options as well as simple spud nut and stem connections. They also feature an optional side-mounted handwheel design, and complete field reversibility without any additional parts. Common spring designs are used in different combinations and assembly configurations to provide the standard spring ranges available.

Benefits

The multi-spring construction of the Dresser Masoneilan 87/88 Actuators results in a more compact design compared to equivalent single spring actuators. The result is a smaller and lighter overall control valve assembly. The use of common parts for the various spring ranges and actuator configurations provides end users with the flexibility to reduce inventory while being able to support various product configurations in the field.

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