There are many potential causes for ASCO solenoid valves to fail, so they are considered to be complex and prone to failure devices. In fact, they are very simple and very reliable. Many problems are caused by reasons other than the valve, while other problems are caused by improper application or incorrect installation.
ASCO solenoid valve should start troubleshooting from checking the voltage and pressure input. The problem may be caused by non-working control relays or pressure regulator fluctuations. If the voltage and pressure check pass, observe the valve. The reasons why the direct-acting solenoid valve cannot work are as follows: low voltage or no voltage; the solenoid coil is burned out; the pressure is higher than the rated pressure of the valve; there are external impurities in the valve; the valve core is stuck or the core tube is damaged. In order to maintain normal operation, when the coil is energized, the solenoid valve spool must move in the core tube and contact the plunger nut. When energized, a sharp metal click should be heard, and the voltage provided to the coil must be at least 85% of the rated voltage on the nameplate. If the voltage of the solenoid valve's coil is correct, but there is no clicking sound, it may indicate that the pipe pressure is higher than the valve's rated pressure. Check it.
When troubleshooting the four-way valve control cylinder, you must follow the instructions that come with the valve. Some four-way valves require an oil mist lubricator in order to work properly. Pilot-controlled four-way valves usually require full-sized pipes for pressure inlet pipes and pressure outlet pipes. In some valves, the speed control device should be in accordance with the speed limit at the cylinder joint. Since the cylinder failure is usually caused by itself, you should check whether the following conditions exist. If the pipe pressure is qualified, external impurities may prevent the valve core from moving in the core pipe. If the top of the valve core is knocked more than millions of times, the valve disc expands or is cut, or the valve core itself is damaged, which will also restrict the movement of the valve core. The pilot operated valve may not work even if it clicks when it is energized. The situation of no flow may be caused by the following reasons: insufficient pressure drop through the valve; rupture of the diaphragm or damage to the piston ring; blockage or restriction of the pilot hole.
When the power is cut off, the pilot-operated valve and the direct-acting valve can not work due to the following reasons: the control circuit is faulty; there is scale and other external impurities in the valve; the valve core is stuck or the core tube is damaged; the spring is broken. The pilot operated valve may also fail due to the following reasons when the power is off: the pressure relief hole is blocked; the valve seat or valve disc is damaged; the diaphragm or piston is damaged; the pressure drop through the valve is insufficient.
Excessive noise of the solenoid valve (humming or shaking) may be caused by the following reasons; voltage is too low; relay failure or electronic control signal is incorrect; solenoid valve parts are loose; there are external impurities on the valve core or on the surface of the plunger nut ; The spring is damaged; the system pressure is too high. Centering between the piston rod and the connected load. Lack of lubrication; worn or leaking piston cups, allowing the fluid in the valve to drain; system control contains external impurities; system overload, pipe pressure is too low, hose or joint size is too small If the problem is not the cylinder, you should check valve.