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VC-230A, VC-231A Multi-Spring Diaphragm Actuators

FEATURES

• Molded Buna-N diaphragms, nylon reinforced.

• Steel Diaphragm Cases.

• Multiple Steel Springs

• Sturdy cast iron lower frame.

• Quick disconnect valve stem construction.

• Valve position indicator.

The VC-230A direct-acting model and the VC-231A reverse-acting model are spring opposed diaphragm actuators. They are designed to provide dependable On-Off or throttling operation of control valves. They may be actuated by pneumatic signals from any suitable temperature or pressure controller.

Specifications
Diaphragm Area: 29 sq. inches (0.02m²) nominal Service Connection: 1/4" - 18 NPT Pattern: Enclosed Spring Type. Spring Ranges: 3-15 psi (0.2-1.0 bar) standard. Other ranges available. Diaphragm Pressure: 100 psi (6.9 bar) max. test 40 psi (4.8 bar) max. working Maximum Stroke: 1" (25.4 mm) Ambient Temperature: 200°F (93°C) Materials: Diaphragm Housing Steel, painted with polyurethane enamel. Diaphragm Buna-N, Nylon reinforced. Diaphragm Plate Aluminum casting Springs Tempered MB wire, zinc plated Actuator Stem Stainless Steel Actuator Stem Guide Bronze, Self-lubricating Frame Cast iron. Stem Connector Stainless Stroke Indicator Aluminum	ACTUATOR OPERATION Model VC-230A - Air pressure from the controller is applied to the top of the diaphragm. As this pressure increases within the range of the load spring, the actuator stem moves down. Model VC-231A - Air pressure form the controller is applied underneath the diaphragm. Increasing pressure causes the actuator stem to move upward.
Download Full Datasheet (PDF format) see assembly options see more control valves main Robertshaw page

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