Operation - GE Baker Hughes Masonelian BR200 Instruction Manual

Operation

Prior to applying supply pressure to the relay, open the bypass needle valve approximately one turn. After
applying pressure, note response of actuator to open and close commands from the positioner. If excessive
overshoot or hunting is seen, open needle valve until stable operation is obtained. If valve is sluggish, close needle
valve until unstable operation occurs, then back off until stable operation is obtained.
Turning valve clockwise (closing) speeds response but can lead to instability. Turning valve counterclockwise aids
stability but will slow down the actuator's response. Proper setting provides stable operation and acceptable
response time.
Bypass valve
Figure 3
Bypass valve adjustment on BR200 model
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Safety screw
Break loose of bypass valve:
Completely loose small screw and turn bypass valve near the
fully opened position may cause bypass valve to break loose by
internal pressure
Adjustment of bypass valve during plant operation:
Adjusting bypass value when control valve is in service may
generate sudden valve opening change or oscillation.
Masoneilan BR200/BR400 High Capacity Volume Booster Relays | 7
Safety screw
Figure 4
Bypass valve adjustment on BR400 model
Bypass valve