Robertshaw Literature Describes Versatile Diaphragm Actuators

Robertshaw Controls Company of Knoxville, Tenn., is offereing free literature describing VC-230/231 actuators that feature a 30-squareinch molded Buna-N diaphragm with nylon reinforcement and deliver dependable on/off or throttling action for control valves.

Actuated by pneumatic signals from any suitable temperature or pressure controller, the Model VC- 230 provides air-to-close action and Model VC-231 air-to-open action.

With a maximum stroke of 1 inch (25.4 mm), these actuators offer a wide choice of valves. These include single-seated, double-seated twoway and single-seated three-way valves in 12 -inch to 4 inches (6 inches in one three-way valve).

Flanged, screwed and union end connections are offered.

High-quality alloy steel spring opposes the diaphragm, which is housed in an aluminum die-cast diaphragm case. The lower frame is cast iron, with an actuator stem of cadmium-plated steel in a selflubricating bronze guide. Standard spring range is 20 to 100 kPa (3—15 psi), with other ranges available.

For literature giving specification details and application advice on Robertshaw Controls' versatile diaphragm actuators, Circle 40 on Reader Service Card

Maritime Reporter Magazine, page 34, Jan 1986

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.