The VC-230A and VC-231A are spring-opposed diaphragm actuators. They are designed to provide dependable on/off or throttling operation of control valves.
Other features include:
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
Field reversible
Manual Models VC-230A and VC231A