VOLVO excavator spare parts 14550884 EC210 12V 24V 28V 110V 220V solenoid valve coil

The solenoid valve coil height 61mm inner diameter 21mm
One: solenoid valve coil four common failures and solutions
1, solenoid valve coil burned out, can remove the solenoid valve wiring, with a multimeter measurement, if open, the solenoid valve coil burned out. The reason is that the coil is damp, causing bad insulation and magnetic leakage, resulting in excessive current in the coil and burned, so to prevent rain into the solenoid valve. In addition, the spring is too strong, the reaction force is too large, the coil turns too few, suction is not enough can also make the coil burned. In case of emergency, the manual button on the coil can be pressed from the "0" position to the "1" position to make the valve open.
2, Air leakage. Air leakage will cause insufficient air pressure, which makes it difficult to open and close the forced valve. The reason is that the sealing gasket is damaged or the spool valve is worn and several cavities are channeling. When dealing with the solenoid valve failure of the switching system, the appropriate time should be selected to deal with the solenoid valve when it is out of power. If it cannot be handled within a switching gap, the switching system can be suspended and handled calmly.
3, The solenoid valve is stuck. Solenoid valve slide valve sleeve and spool with a small clearance (less than 0.008mm), is generally single assembly, when there are mechanical impurities into or too little oil, it is easy to get stuck. The treatment method can be steel wire from the head hole inserted, so that it springs back. The fundamental solution is to remove the solenoid valve, take out the spool and spool sleeve, clean with CC14, so that the spool is flexible in the valve sleeve. When disassembling, attention should be paid to the assembly sequence and external wiring position of each component, so as to reassemble and wire correctly. It is also necessary to check whether the spray hole of the oil mist is blocked and whether the lubricating oil is enough.
4, The solenoid valve connector is loose or the wire falls off, the solenoid valve shall not be electric, and the wire can be fastened.
Two: What is the working principle of the solenoid valve coil introduction description Solenoid valve includes a coil, magnet, ejector rod. When an electric current is applied to the coil, magnetism is generated, which attracts the magnet, and the magnet pulls the ejector rod. Turn off the power, the magnet and ejector rod reset, so that the solenoid valve completed the work process. That's how the solenoid valve works. Solenoid valves are generally used in hydraulic systems to close and open the oil circuit. In fact, depending on the temperature and pressure of the flowing medium, for example, the pipeline has pressure and the artesian state has no pressure. The solenoid valve works differently. For example, in the state of artesian need zero pressure start, is energized, the whole coil to the gate body suction. And the pressure state of the solenoid valve, the coil is energized after sucking out a pin inserted in the gate body, with the fluid pressure to put the gate body up. The difference between the two ways is that the solenoid valve of the flow state, because the coil to suck up the whole gate body, so the volume is larger and the solenoid valve of the pressure state, only need to suck up the pin, so the volume can be relatively small.
Three: (1) the external leakage is blocked, the internal leakage is easy to control, and the use is safe. Internal and external leakage is a hazard to safety. Other automatic valves usually extend the stem, by electric, pneumatic, hydraulic actuator control spool rotation or movement. It is necessary to solve the external leakage problem of long-term action valve stem dynamic seal; Only the solenoid valve is electromagnetic force acting on the iron core sealed in the magnetic sleeve tube, there is no dynamic seal, so the leakage is easy to block. Electric valve torque control is not easy, easy to produce internal leakage, or even pull the stem head; The structure of the solenoid valve allows easy control of internal leakage until it is reduced to zero. Therefore, the use of solenoid valve is particularly safe, especially suitable for corrosive, toxic or high and low temperature media.
(2) action express, small power, lightweight appearance. Solenoid valve response time can be as short as a few milliseconds, even pilot solenoid valve can be controlled in dozens of milliseconds. Because of its own loop, it is more sensitive than other automatic valves. Properly designed solenoid valve coil power consumption is very low, energy saving products; Can also do only trigger action, automatically maintain the valve position, usually no power consumption. Solenoid valve size is small, saving space, lightweight and beautiful.
(3) The system is simple, then the computer, low price modest. The solenoid valve itself is simple in structure and low in price. It is easy to install and maintain compared with other kinds of actuators such as regulating valves. What is more remarkable is that the automatic control system is much simpler and the price is much lower. Because the solenoid valve is a switch signal control, and industrial control computer connection is very convenient. In today's computer popularity, the price of the era of substantial decline, the advantage of the solenoid valve is more obvious.
Four: solenoid valve factory solenoid valve coil short circuit or break detection:
1, solenoid valve factory solenoid valve coil short circuit or break: detection method: first use a multimeter to measure its off, the resistance value tends to zero or infinity, that coil short circuit or break. If the measured resistance value is normal (about tens of ohm), it does not mean that the coil must be good (I once measured a solenoid valve coil resistance value of about 50 ohm, but the solenoid valve cannot operate, everything is normal after replacing the coil), please conduct the following final test: Get a small screwdriver and put it near the metal rod in the solenoid coil. Then energize the solenoid valve. If it feels magnetic, then the solenoid coil is good, otherwise it is bad. Solution: Replace the solenoid valve coil.
2, plug/socket problem: solenoid valve factory solenoid valve fault phenomenon: if the solenoid valve is the kind of plug/socket, there may be metal spring socket problems, plug wiring problems (such as the power line connected to the ground wire) and other reasons can not be sent to the coil power. It's best to get into the habit of unscrewing the retentive screw after the plug is in the socket, and unscrewing the retentive nut after the spool rod on the coil. If the plug of the solenoid valve coil is equipped with a LED power indicator, then the use of DC power to drive the solenoid valve will be connected to the right line, otherwise the indicator will not be bright. In addition, do not switch power plugs with leds for different voltage levels. This will cause the leds to be burned/the power supply (replace with a lower voltage level plug) to short circuit or the leds to emit very weak light (replace with a higher voltage level plug). If there is no power indicator light, the solenoid valve coil is not differentiated polarity (unlike the transistor time relay whose coil voltage is DC and the coil with diode/resistance leakage circuit in parallel for DC intermediate relay, need to distinguish polarity). Treatment method of solenoid valve manufacturer: correct wiring errors, repair or replace plugs and sockets.
3, the valve spool problem: fault phenomenon 1: in the case of the solenoid valve through the medium pressure is normal, press the solenoid valve red manual button, the solenoid valve does not have any reaction (pressure medium no on-off changes), indicating that the valve spool must be bad. Treatment method: Check whether there are problems in the medium, such as whether there is a lot of water in the compressed air (sometimes the role of the oil-water separator is not very big, especially when the pipeline design is poor, the compressed air through the solenoid valve will have a lot of water), whether there are a lot of impurities in the liquid medium. Then remove water or impurities in the solenoid valve and pipeline. If not, please repair (if you have the time, patience and necessary ) or replace the spool, or simply replace the whole solenoid valve. Fault phenomenon 2: After inspection, the coil is the original coil and the coil is energized when the magnetic normal, but the solenoid valve still does not act (then the solenoid valve manual button function may be normal), indicating that the valve core is bad.
Five: the solenoid valve coil through the current will heat, the temperature will gradually rise. After a certain amount of time, heat and heat dissipation in balance, the temperature will reach a stable value. The difference between this temperature and the ambient temperature is called temperature rise. Solenoid valve coil temperature rise is a normal phenomenon. Higher allowable temperature rise determined by the type of insulation coil, electromagnetic coil temperature appreciation should be relatively high allowable temperature rise, electromagnetic valve environmental temperature by the coil insulation type of higher allowable temperature and solenoid valve coil temperature appreciation to determine, speed brand universal solenoid valve coil using B kinds of insulation, if the ambient temperature is not higher than 60 degrees, the electromagnetic coil temperature rise is not more than 70 degrees. (Class B insulation type: higher allowable temperature rise of 90 degrees, higher allowable temperature of 130 degrees). Use a meter to measure the resistance of the solenoid valve, coil resistance should be about 100 ohms! If the resistance of the coil is infinite that is broken, you can also power the solenoid valve coil with iron products on the solenoid valve, because the solenoid valve with magnetic can absorb iron products after the solenoid valve coil is energized. If you can absorb the iron products that coil is good, otherwise that coil is broken. Solenoid valve coil short circuit or break detection method is to use a multimeter to measure its on and off, the resistance value tends to zero or infinity, that coil short circuit or break. If the measurement of the resistance value is normal, can not show that the coil must be good, should also find a small screwdriver to wear in the solenoid valve coil near the metal rod, and then to the solenoid valve energized, if you feel magnetic, then the solenoid valve coil is good, otherwise it is bad.
Six: solenoid valve products at work, it will be found that there is heat in the solenoid valve coil, generally caused by the heating of the solenoid valve coil for a long working time. But as long as the product within a reasonable temperature range, the heating of the solenoid valve coil will not affect the normal work of the solenoid valve. However, if the working temperature is too high, it will affect the working efficiency of the solenoid valve and even damage the solenoid valve parts. The reasons for the heating of the solenoid valve coil and the treatment methods are as follows:
1, first check whether the temperature of the solenoid valve coil is in the product to adapt to the temperature range, this can refer to the solenoid valve product manual, generally there are specific instructions on the solenoid valve work and environmental temperature. If not, consult the manufacturer according to the model. Generally a little heat of the solenoid valve belongs to the normal phenomenon of product work, as long as it does not exceed a certain temperature is fine, this user can rest assured.
2, due to the improper selection of the user, the solenoid valve products are normally open and normally closed two types, if the user uses the normally closed solenoid valve, and the actual work is normally open, it is easy to cause the solenoid valve coil overheating phenomenon. And if this is the reason, can only replace the new solenoid valve products, so the user's model choice is very important.
3, if the solenoid valve coil installed energy-saving protection module (the role of the energy-saving module is to save energy and solenoid valve coil cooling), and the failure of the energy-saving protection module, will also lead to coil heating.
4. Overload work, that is, the actual working environment of the solenoid valve, exceeds the working environment range of the design of the solenoid valve product. For example, the ambient temperature and medium temperature are too high, or the pressure is too high and the power supply voltage and other problems.
5, solenoid valve coil itself quality problems, this reason is very unlikely, because the manufacturer will not affect their brand reputation with low quality products. So there will be attention to the quality of solenoid valve products. Solenoid valve coil heating temperature, if within the range of the product work, users in use can not care about, this will not cause what impact on the work of the solenoid valve.
Seven: the resistance of the solenoid valve with a multimeter, the resistance of the coil should be about 100 ohm, if the resistance of the coil is infinite that is broken, you can also give the solenoid valve coil on the electric with iron products on the solenoid valve, because the solenoid valve with magnetic can absorb iron products after the solenoid valve coil is energized. If you can absorb iron products that the coil is good, it means that the coil is broken. Solenoid valve coil short circuit or break detection method is to use a multimeter to measure its on and off, the resistance value tends to zero or infinity, that coil short circuit or break. If the measurement of the resistance value is normal, can not show that the coil must be good, should also find a small screwdriver to wear in the solenoid valve coil near the metal rod, and then to the solenoid valve energized, if you feel magnetic, then the solenoid valve coil is good, otherwise it is bad.