how can check the loopchecking for valves?

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how can check the loopchecking for valves?..

First I have explain about Loop Check. Loop check means
that we have to check the functionality of Field
Instruments to DCS/PLC.

For Valves,you have to simulate the value from DCS/PLC in
step by step(0%,25%,50%,75% and 100%).Valve actuation to be
confirmed by actuator Scale which is in the Valve.

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how can check the loopchecking for valves?..

Answer / s.selvakumar

control valve loop check means we have to identify open
loop or closed loop,if its closed loop we have to simulate
from primary instruments upto final control element we need
to check,if its in open loop we can stroke check from
control desk.

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how can check the loopchecking for valves?..

Answer / r.g.m

first we must check the connections through the scheme
diagram,then trace out the open and closed limit
switches.verifiy the connections between open and closed
limits...........

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