Reversing pneumatic valve of common faults and maintenance method ( 1)

closed lax, if electromagnetic pilot pneumatic valve inlet and vent was sludge and other debris jam. Activity is jammed, core circuit such as fault, all can lead to the reversing pneumatic valve can't normal commutation. The first kind of circumstance should be cleaning the forerunner of pneumatic valve and activities on the core of sludge and impurities. And circuit fault generally divided into two groups: the control circuit fault and electromagnetic coil. To check the circuit before failure, should be the reversing of the pneumatic valve manual knob turning a few times, see the reversing pneumatic valve under the rated pressure whether can normal commutation, if can normal commutation, circuit is defective. Check, instrument measurement of the electromagnetic coil voltage are available, and see whether achieve the rated voltage, if the voltage is too low, should further check the control circuit of the power supply circuit and associated travel switch. If the reversing pneumatic valve under rated voltage can't normal commutation, should check the joint of electromagnetic coil ( Plug no loosening or contact false. Method is to remove the plug, measure the resistance of the coil, if the value is too big or too small, and explain the electromagnetic coil is damaged, should be replaced.

the reversing pneumatic valve failure: pneumatic valve cannot reversing or reversing slow, & lt; The reversing pneumatic valve failure: pneumatic valve can't reversing or reversing slow. Gas leak, electromagnetic pilot pneumatic valve is faulty, etc.
is usually due to poor lubrication, spring stuck or damage, oil pollution or impurity sticking sliding local causes, such as reversing pneumatic valve can't reversing or reversing slow. Should first check the oil sprayer working is normal; The viscosity of the lubricating oil. When necessary, the lubricating oil should be changed, cleaning the reversing pneumatic valve sliding local, or replace the spring and the reversing pneumatic valve.
results in a gas leak in the pneumatic valve, reversing pneumatic valve is seen after long time using the pneumatic sealing ring wear, pneumatic valve stem and valve core phenomenon of pneumatic valve seat damage. Pneumatic valve slow or can't normal commutation failure, etc. At this point, you should replace the sealing ring, pneumatic valve rod, and pneumatic seat, or will the reversing pneumatic valve.