1 Notes related to electrical

(1) Make sure that the electrical circuit connected to the pneumatic directional control valve does not have poor contact. If the coil remains energized for a long time, it will inevitably cause heat, and after the insulation deteriorates, there will be a lot of energy loss. In this case, you can consider choosing an electromagnetically controlled pneumatic directional valve with a memory function to make the coil energized. Working time shorten.

(2) Only after confirming that the electromagnetically controlled directional valve is powered off, the manual button is allowed to reverse the direction of the directional valve. After using the manual button to switch the solenoid valve, it is not possible to energize the solenoid-controlled directional valve, especially the direct-acting solenoid valve, otherwise, it is easy to burn the valve.

(3) Ensure that the voltage used to supply the electromagnetically controlled directional valve must be within the allowable voltage fluctuation range of the valve before it can work.

(4) For the pilot solenoid directional valve, the power-on or power-off time of the pulse electrical signal should be greater than 0.1s, to avoid the malfunction of the main valve due to the short power-on or power-off time and it is too late to be completely switched. If the time of the pulse electrical signal is too short, the pulse electrical signal can be maintained for a sufficient time by setting the time relay.

(5) If the system requires long-term continuous power-on, the selected solenoid valve should have the function of long-term power-on, or choose to use a low-power solenoid valve or a solenoid valve with a power-saving circuit.

(6) Because the solenoid valve is generally installed in the control cabinet, when the solenoid valve may continue to be energized for a long time, the problems of maintaining good ventilation and easy heat dissipation of the control cabinet must be considered to ensure that the temperature of the solenoid valve is always kept within the allowable temperature fluctuation range of the solenoid valve.

(7) When the switching element and the resistance-capacitance element are required to be used in parallel, there will be a leakage current through the resistance-capacitance element, and this leakage current will generate a leakage voltage at both ends of the electromagnetic coil. If the leakage voltage is too large, the electromagnet will always be energized but cannot be powered off. In this case, the leakage resistance can be connected to ensure safety. The allowable voltage through the solenoid coil that ensures that the moving iron core can be reset is called the reset voltage. If the reset voltage of the solenoid valve is less than the leakage voltage, the moving iron core cannot be reset. Therefore, to reset the moving iron core, the voltage used must be greater than the drain voltage.

(8) When wiring a solenoid valve with an overvoltage protection circuit for DC specifications, first confirm whether it has polarity. When it is found that there is a polarity, it should be considered that if the polarity is wrongly connected, the electromagnetic coil will burn quickly because there is no built-in diode for polarity protection; if there is a polarity protection diode, even if the polarity is wrongly connected, the valve just doesn't switch.

2 Notes on the installation of pneumatic directional valve

(1) Generally speaking, there are not too many requirements for the installation of the electromagnetically controlled directional valve, but when installing the three-position spool valve and the double electric control spool valve, pay attention to keeping it level. Pay attention to the installation direction to prevent the intrusion of water and dust. For example, the electromagnetic head or electromagnetic coil should not be installed downward to avoid the intrusion of condensed water. In an environment with vibration, the installation direction of the spool valve should be perpendicular to the vibration direction when installing the spool valve. If the vibration acceleration in the environment is too large, the solenoid valve cannot be used.

(2) There is a breathing hole at the control piston of the main valve, and the exhaust hole of the pilot valve this breathing hole must not be blocked or the exhaust is not smooth.

(3) The reversing valve should be installed as close as possible to the cylinder, which can not only reduce air consumption but also speed up the response speed.

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pneumatic directional control valves for sale.