Automatic Line Break and Low Pressure Shutoff Control
2018-12-26 · The low pressure shutoff portion of the control functions as follows: SEQUENCE 1 - VALVE FULLY OPEN Control components for the low pressure shutoff function include an adjustable air relay valve (X) and an ESD poppet valve (N). Pressure from the pipeline is ported to the sensing portion of air relay valve (X) holding it in the open position.
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