What are the causes and solutions for solar solenoid valve leakage? Working principle of solar water heater solenoid valve

What are the causes and solutions for leakage of solar solenoid valves?


Leakage from the solenoid valve of a solar water heater is a very common solar fault. There are only two faults in the solar solenoid valve. One is that the coil is bad;the other is that it is not leaking.


First, let’s take a look at what the solar solenoid valve looks like (as shown below). The leakage of the solar solenoid valve is mainly caused by the solar water heater being exposed to wind and sun for many years. The plastic parts are prone to aging, which causes the solenoid valve to age. Rusty and leaky. There is another situation that causes the solar solenoid valve to leak, that is, the screws on the interfaces on both sides are loose. In this case, you only need to tighten the screws.





How to deal with the leakage of the solar solenoid valve: The aging of the plastic causes the leakage of the solar solenoid valve. The only solution is to replace it. Do not try to glue it with glue, it may not stick.





Working principle of solar water heater solenoid valve






The principle of the solar solenoid valve to control the water filling of the water heater, in popular engineering language, is that an automatic water supply control circuit is very simple. You can add a liquid level electrode (either galvanized round steel or stainless steel) to the solar energy, and connect two The electrode is connected in series to the positive pole of the 24VDC power supply, and an external 24VDC relay is connected to the relay to control the solenoid valve. The two electrodes are long (lower limit) and short (upper limit). When the water level is at the lower limit, that is, the water does not cover the long electrode, the relay will not be energized and the solenoid valve will open to supply water.







When the water level rises to the upper limit, the two electrodes are connected through the water, the relay is energized, the solenoid valve closes, and the water supply stops. You can also use a float switch to control the automatic water supply, which makes the circuit simple. You only need to connect the power supply to the float switch, control the relay through the switch, and then the relay controls the solenoid valve. Principle: When the water surface reaches the upper limit, the float switch is turned off, the relay loses power and turns off the solenoid valve, and the lower limit float switch turns on the relay and turns on the solenoid valve.







Things to note when installing solar water heater solenoid valves:
The function of the solar solenoid valve is to prevent return or directional flow in the pipeline. When the solenoid valve is filled with water to the solar water heater, it opens to allow cold water to enter the water tank. When the water supply stops, the solenoid valve closes, then the solar water heater The water in the water tank cannot flow back into the cold water pipe through the solenoid valve.




If the solenoid valve is still closed when using water from the water heater, then the water can only flow to the hot water pipe but not the cold water pipe. Generally speaking, solenoid valves and solar meters are used together and should be fully automatically controlled, so there is no need to control the solenoid valve separately when trying out a solar water heater.




Solar solenoid valves are divided into two types: pressured and pressureless. If the cold water pressure is relatively small, it is best to choose a pressureless valve, otherwise the solenoid valve may not open and the water cannot be supplied normally;if the water pressure is large, Choose a pressure valve, otherwise the solenoid valve may not be able to check back, which means that the water in the water heater may flow back into the cold water pipe or the solenoid valve cannot be closed, causing the temperature of the water heater to fail to rise.




The above is the cause and solution of solar solenoid valve leakage, and the working principle of solar water heater solenoid valve is introduced. If you want to know more related information, please log in to Sunway Pneumatic www.diancifa.cc to view.