Positioning Device for Pressure Regulator

A regulator, comprising:

• a valve body defining a flow-path for a fluid;
• an actuator casing coupled to the valve body;
• a control member disposed within the actuator casing and adapted for displacement relative to the valve body for regulating a flow of the fluid through the flow-path;
• a central rod disposed through the actuator casing;
• a first spring seat fixed relative to the central rod;
• a second spring seat fixed relative to the actuator casing;
• and
• a spring disposed between the first spring seat and the second spring seat, the spring biasing the control member into a predetermined position within the casing of the regulator.

A regulator, comprising:

• a valve body defining a flow-path for a fluid;
• an actuator casing coupled to the valve body;
• a control member disposed within the actuator casing and adapted for displacement relative to the valve body for regulating a flow of the fluid through the flow-path;
• and
• a positioning device assembly comprising a central rod and a spring disposed about the central rod, at least a portion of the central rod disposed within the control member, the spring disposed outside of the control member and biasing the control member into a predetermined position relative to the valve body.