History of Diaphragm Valves
Valvulas Century De S.A. de C.V.
Automatic Diaphragm Valves
Manual Diaphragm Valves
Spare Parts for Diaphragm Valves
Diaphragm Relief Valves
Diaphragm Control Valves
Process Control Valves and Instrumentation Products
Actuator Size 4
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Actuator Size 4, Actuator Size "4"
- with seven interchangeable sizes - longer strokes and higher air pressure capability - Century actuators provide for maximum use of available power.
Note that the No. 0 actuator in the double-acting (air to close-air to open) version will fully stroke a 2-1/2" valve - while the air to spring version will fully stroke a 3" valve. This compares with our nearest competitor's smallest actuator which can fully stroke only a 1-1/4" valve.
The high grade - 30,000 lbs. per square inch tensile strength cast iron diaphragm cases - together with the uniquely produced actuator diaphragm and steel diaphragm plates, allow the use of higher operating air pressures, with consequent reduction in the size and cost of the actuator required.
The actuator diaphragm, which is produced and molded under an exclusive process, is batch tested at 125 psig. operating air pressure for 175,000 strokes before the batch is released to the valve assembly department.
Stroke (Air to Air)
Stroke (Spring Closed)
Stroke (Spring Opened)
Max. Air Pressure
Weight of Spring and Spring-Case Assembly
Weight for Type "C" and Type "H"
In compiling the weight of a Type "HRT" (air open-spring closed) valve it is necessary to add the weight of the spring and spring-case assembiy to the bottom-works, actuator and accessory weights.
Century Instrument Company
11865 Mayfield, Livonia, MI 48150
Phone: 734.427.0340 Fax: 734.427.5950
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