The INVALCO Series 596 Valve Actuators were designed specifically for use with butterfly valves, ball valves and other applications where powerful reciprocating motion is required. A wide selection of diaphragm sizes and spring rates provide economic automation and control to valves, dampers, louvers and other applications. All sizes of actuators have the same threaded mounting connection and the same stern threads making one standard mounting arrangement possible. The lower stem bushing is designed to serve as the adjustable travel limit stop providing the best stem thrust support possible.

Materials of Construction

Diaphragm Case
Heavy drawn steel. Cadmium plated steel nuts and bolts are used to attach the upper and lower case.

Diaphragm
Chemical resistant Buna-N with nylon reinforcing molded in for strength and durability. Peroxide cured Buna-N and Viton are available, consult factory.

Diaphragm Plates
Cast iron or steel designed to support, protect and align the diaphragm.

Stem
Stainless steel, polished for minimum friction and wear.

Clevis
The Clevis for mating the actuator stem to the valve shaft is steel, zinc plated for corrosion resistance.

Stem Packing
Cotton fiber reinforced Buna-N

Spring
Tempered steel, precision wound to provide the spring rate desired.

Mounting Connection
Steel, zinc plated for corrosion resistance. Brass and stainless steel bearings guide the stem.