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Solutions to valve failures in concrete plants

December 13, 2021
Zhengzhou YCZG valve: the valve can not change the operation or slow change, gas leakage, etc. The electromagnetic control valve is faulty.
Henan Yicheng Heavy Industry Machinery Manufacturing Co. Ltd.
(1) The reversing valve of the concrete mixing plant cannot be decelerated or reversed, usually due to insufficient lubrication, damaged or stuck springs, jamming or entrained oil, etc. causing the slippery section. In this regard, first of all, check whether the oil mist is working properly and whether the viscosity of the grease is appropriate. If necessary, lubricate and clean the sliding part of the reversing valve, or replace the spring and reversing valve.
 
(2) After long-term use of the reversing valve of the concrete mixing plant, the spool seal will be worn, the valve stem and seat will be damaged, resulting in air leakage inside the valve and the valve cannot be reversed normally. At this time, it is necessary to replace the seal, valve stem and valve seat, or replace the reversing valve.
 
(3) If the concrete plant enters the solenoid pilot valve, the exhaust hole is blocked by mud and other debris, tightly closed, the moving core is stuck, the circuit is faulty, etc., which cannot lead to normal valve reversal. For the first 3 cases, clean the pilot valve and movable iron core on the mud and impurities. Circuit faults are generally divided into two types of control circuit faults and solenoid coil faults. Before checking for circuit faults, the hand valve handle must be turned several times to see if the valve reaches the rated pressure during normal reversal faults. Check whether the instrument can measure whether the solenoid voltage reaches the rated voltage, if the voltage is too low, the power supply of the control circuit and the corresponding tripping circuit should be checked separately. If the valve does not operate at the rated switching voltage, check the solenoid valve connector (plug) for loose or solid material. The method is to disconnect the plug by measuring the coil resistance (which should generally be between a few hundred and a few thousand ohms), if the resistance is too high or too low, the solenoid valve is damaged and should be replaced.

TAG:   concrete mixing plant concrete mixer
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