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Modular Pilot Check Valve is modular construction pilot check valve If for long time position one and two operating oil ports will not be leakage It is from A to A1 or B to B1 for free flow and for cutoff in reverse If the oil flow from A to A1 it will push the spool and control the check valve by the pilot valve 3 At this time the oil flous from B1 to B and the pipe B1 is unlooding the cloeck valve 3 will be opened To ensure the cone spool correctly cuttoff the woking oil port must be passed througy return oil line for unloading when the control valve is for centre position.
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