Masoneilan™ 4700/4800

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One Multi-lobe Cam

The cam provides field-changeable linear, split-range linear and equal percentage control characteristics. Custom characteristics are available on special order.

Zero Adjustment

Adjustment of the positioner zero can easily be accomplished by means of the adjustable spring button. Further zeroing can be performed through the turnbuckle assembly on linear motion actuators.

Corrosion-resistant Materials

Premium performance is the standard on the models 4700P/4700E and 4800P/4800E positioners. Internal components are manufactured of corrosion-resistant materials for protection against the harshest environments.

Fully Enclosed

All adjustments are fully enclosed for protection from the environment.

Simplicity

Positioner action can be reversed without additional parts (4700P/4800P only). The same mounting orientation is used for both direct and reverse action.

Easy to Maintain:

The pilot valve is the only moving part and is removable without disassembly. An optional rear-mounted bypass allows maintenance during operation. Its position discourages tampering.

Optional Bypass:

A molded nylon bypass valve with O-ring seal ensures continued control during pilot valve cleaning. Concealed at the back to avoid tampering. Available only on the 4700P pneumatic direct action positioner.

Damping Adjustment

On model 4700, actuator travel speed can be adjusted as required for stable operation