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How to adjust the installed HEP electrical valve positioner?

Column：Technical article Time：2017-11-09
When the electrical valve positioner newly installed in the control valve, or the control valve stroke does not meet the requirements of the input control model needs to be adjusted, the instrument instrumentation to teach you...

When the electrical valve positioner newly installed in the control valve, or the control valve stroke does not meet the requirements of the input control model needs to be adjusted, the instrument instrumentation to teach you the specific method of debugging as follows: For HEP-15, HEP-16 , HEP-171, adjust: 
(1) air supply pipeline through the air filter pressure reducing valve connected to the implementing agencies, with air filter regulator to adjust the size of the air supply pressure, the actuator stem is located in the center of travel.

(2) Then check that the positioner is dry at 90 degrees to the feedback
(3) Disassemble the air supply line from the actuator, attach it to the air supply port of the positioner (SUP), and connect the output port (OUT) of the positioner with the air chamber of the actuator.
(4) Zero adjustment steps are as follows: Enter a 4mA signal, the actuator starts to move (standard input signal 4-20mA), adjust zero handwheel, make zero meet the requirements.
(5) Range adjustment steps are as follows: Enter a 20mA signal, record the valve stroke. If the stroke is less than the rated stroke, loosen the span adjustment locking screw, turn the range adjustment hand wheel to move the screw according to the arrow direction, and then set the locking screw again.
(6) Repeat steps 4 and 5 above to make the span and zero point reach the specified value.

2, electrical valve positioner is the role and reaction exchange
Interchange steps for linear positioner interaction and other features The role of the positioner interchangeable steps, location of the positioner range adjustment mechanism depends on the type of action of the actuator.