Emerson Fisher 656- Manuals

Instruction Manual D100304X012 656 Actuator August 2012 2 Table 1. Specifications Maximum Recommended Casing Operating Pressure (1) 2.4 bar (35 psig) Maximum Allowable Casing Pressure (2) Actuator Size Maximum Casing Pressure for ActuatorSizing (2) , Bar (Psig) Maximum Excess Diaphragm Pressure (1) ...

Instruction Manual D100304X012 656 Actuator August 2012 3 Maximum Pressure Limitations The casing and diaphragm of 656 actuators are pressure operated. This air pressure provides energy to compress the spring, to stroke the actuator, and to seat the valve. The following explanations describe the max...

Instruction Manual D100304X012 656 Actuator August 2012 4 The actuator spring and diaphragm have been selected to meet the requirements of the application. It should be noted that the actuator spring has a constant rate of compression and that adjustment of the spring compression merely shifts the i...