Common faults and maintenance methods of the hotte

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Common faults and maintenance methods of reversing valve

the faults of reversing valve include: the valve can not reverse or the reversing action is slow since the implementation of the national standard of polyurethane waterproof coating revised in 2003, gas leakage, failure of electromagnetic pilot valve, etc

(1) the change-over valve cannot change direction or the change-over action is slow, which is generally caused by poor lubrication, stuck or damaged springs, oil or impurities stuck in the sliding part, etc. In this regard, you should first check whether the oil atomizer works normally; Whether the viscosity of lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the reversing valve with a minimum reading of 0.0001n, or replace the spring and reversing valve

(6) packaging is the post Zui process

(2) the change-over valve is prone to wear of the sealing ring of the valve core and damage of the valve stem and valve seat after long-term use, resulting in gas leakage in the valve, slow action of the valve or failure of normal change-over and other faults. At this time, replace the sealing ring, valve rod and valve seat, or replace the reversing valve

(3) if the inlet and outlet holes of the solenoid pilot valve are blocked by oil sludge and other sundries, the sealing is not tight, the movable iron core is stuck, and the circuit is faulty, etc., the reversing valve can not be reversed normally. For the first three cases, clean the oil sludge and impurities on the pilot valve and movable iron core. Circuit faults are generally divided into control circuit faults and electromagnetic coil faults. Before checking the circuit fault, turn the manual knob of the reversing valve for several times to see whether the reversing valve can reverse normally under the rated air pressure. If it can reverse normally, the circuit is faulty. During the inspection, use instruments to measure the voltage of solenoid 2 coil to see whether the rated voltage is reached. If the voltage is too low, further check the power supply in the control circuit and the associated travel switch circuit. If the reversing valve cannot reverse normally under the rated voltage, check whether the connector (plug) of the solenoid coil is loose or not. The method is to unplug the plug and measure the resistance of the coil. If the resistance is too large or too small, it means that the electromagnetic coil has been damaged and should be replaced

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