When the diesel engine stalls, there is a coil in the solenoid valve that is the same as that of a generator. When the device is energized, a magnetic force is generated to move the flameout switch back toward the oil. the power is cut off, there is no magnetic force, and the spring pushes the extinguisher to the extinguisher position, there will be no fuel supply. After long-term use of the extinguishing solenoid valve, the piston is easily blocked by dust and dirt and cannot move, and then it may fail to start or shut down.
Notes on installing the solenoid valve:
1. When installing, please note that the arrow on the valve body should be consistent with the direction of fluid flow. Do not install in places with direct drops or splashes of water. The solenoid valve should be installed vertically upwards;
2. The solenoid valve must ensureer normal operation within the supply voltage fluctuation range of 15% to 10% of the rated voltage;
3. Installation of the solenoid valve Finally, there should be no difference in reverse pressure in the pipeline. And it needs to be powered on several times to make it suitable for the temperature before it can be officially put into use
4. The pipeline should be thoroughly cleaned before installing the solenoid valve; Incoming media must be free of impurities. Install a filter in front of the valve;
5. When the solenoid valve fails or is cleaned, a bypass device must be installed to ensure the system continues to operate.
Detailed information:
Solenoid valves are basically divided into three categories:
1. /p>
Principle: When the power is turned on, the solenoid coil generates electromagnetic force to lift the element closing of the valve seat, and the valve opens when the power is turned off, the electromagnetic force disappears and the valve opens. The spring presses the closing element against the valve seat and the valve closes.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.
2. Direct acting solenoid valve step by step:
Principle: It is a principle that combines direct acting and piloting when there is no pressure difference between. the inlet and outlet, the valve is powered. Finally, the electromagnetic force directly lifts the small pilot valve and the main valve closing parts upward in sequence, and the valve opens.
When the inlet and outlet reach the starting pressure difference, after power on, the electromagnetic force drives the small valve. The pressuren in the lower chamber of the main valve increases and the pressure in the upper chamber. decreases, thus using the pressure difference to push the main valve upwards. When energized, the pilot valve uses spring force or medium pressure to push the closing element down to close the valve.
Features: It can work safely under zero pressure difference, vacuum and high pressure, but the power is large and it should be installed horizontally.
3. Pilot operated solenoid valve:
Principle: When powered, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops quickly, forming upper and lower pressure. , and a higher pressure around the differential closing element, the fluid pressure causes the closing element to move upward and the valve opens when thesupply is cut off, the spring force closes the pilot hole and the inlet pressure passes quickly through the bypass; hole to form a lower and upper pressure difference in the chamber around the closing member, and the fluid pressure pushes the closing member moves down, closing the valve.
Features: The upper limit of the fluid pressure range is relatively high and can be installed arbitrarily (customization is required) but the fluid pressure difference condition must be met.
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