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      uestion Can we use a control valve without positioner?
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  1. Question Published at Thursday, 01 July 2010 in Category Instrumentation . Question Visited: 4557 Times.
Answer  
# 1 Control valve can not be without positioner. The purpose of the positioner is to control the control valve stroke so as to keep the valve in desired position. The positioner receives signal from the controller, and send the boosted signal to the actuator to reach the desired position as and when the valve reaches the desired position the positioner cuts the boosted signal to the actuator and keeps the position.
Answer Submitted by: Admin
Is This Answer Correct?    35 Yes 10 No
Answer  
# 2 yes, we can use control valve without a positioner, in fact when the positioner is malfunctioning there is a provision to bypass it until possible to repair / replace, however we cannot get efficient control valve operation without positioner, so ideally positioner should be installed for control valves.
Answer Submitted by: Mahesh Tulsiani
Is This Answer Correct?    11 Yes 4 No
Answer  
# 3 Yes,we can use a control valve without a positioner.But when there is a deviation of the valve plug from the desired position decided by the controller due to some external disturbances,it cannot be rectified without a positioner.So its better to use a valve with a positioner.
Answer Submitted by: Vivek Narayanan
Is This Answer Correct?    4 Yes 2 No
Answer  
# 4 As per control application and process design/requirment still many pneumatic control loops available without positoner control valve. so my answer is yes.
Answer Submitted by: Amjad Ali
Is This Answer Correct?    0 Yes 1 No
Answer  
# 5 Yes but we are not control same like on off valve.
Answer Submitted by: Deenathayalan
Is This Answer Correct?    0 Yes 0 No
Answer  
# 6 If control valve bench set is 0.2 kg/cm2 to 1 kg/cm2 then we can use a control valve without positioner.
Answer Submitted by: Naveed Ahmad
Is This Answer Correct?    0 Yes 0 No
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    • chhabiraj (1 Comment) 21st of August 2011

      chhabiraj Said

      Yes we can use valve without positioner.it will open or close depending on action as per giver air pressure.

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