Choose the solenoid valve according to pipeline parameters, including nominal diameter (DN) and interface type (also known as connection type).
1. Identify nominal diameter according to the internal diameter or flow of on-site pipelines.
2. For connection type, when DN is larger than 50, flange connection is preferred. When DN is no smaller than 50, either thread or flange connection is viable, and users can choose either one freely.

The solenoid valve quality, good or bad, is decided by the coil and the valve. Therefore, it mainly take a test on this two parts to check if the solenoid valve is good or bad. This is a 24V DC general purpose solenoid valve and how can we know it is good or bad? Let us make a test for it.
Find a 24V power source, and connect it to the coil. If any noise is heard, it means the solenoid valve coil and valve element are normal, which can ensure normal connection. Then, leakage detection is conducted. It is the best if there is the air supply, for the air supply can be directed injected to judge whether gas leakage exists. If there is no air supply, block the air outlet and blow it using the mouth. Testing the coil of solenoid valve can also be conducted with the multimeter.

What is the current of solenoid valve coil? During the daily use of the solenoid valve, people might usually encounter burning of the solenoid valve coil. Is it related to the solenoid valve coil current? You can find the answer in the following part.
Those interested in solenoid valve coil current have mostly explored causes of solenoid valve coil burning. Is the solenoid valve coil current attributable to the solenoid valve coil burning? In fact, there are many causes which might result into solenoid valve coil burning.

1. Coil quality problems
2. Shut-off overvoltage breakdown
3. Too high voltage of power supply
4. Repeated impulse, overcurrent or overheating of frequent switching
5. Unstable installation and excessive mechanical shock, whose frequent connection and turnoff will cause the overcurrent or overheating.

Leakage is a common problem in the use of solenoid valves. So what causes the leaking of solenoid valves and how to deal with this problem? The following information may be give you an answer.
Every solenoid valve has its working scope. Exceeding its working scope, such as differences of temperature and voltage, can influence the solenoid valve operation or even result in its leakage.
A method to cope with the above problem is to test the medium attribute of the solenoid valve to see whether it is consistent with the operating scope of this type of solenoid valve. According to practical situations, the medium temperature and pressure can be adjusted or a new solenoid valve product can be adopted.

Is it necessary to add a strainer upstream the solenoid valve? How to add? What are the benefits? A fine mesh may affect the flow while a coarse mesh may be unable to realize filtration, what shall the proper strainer be? Is it necessary to add a filter upstream any kind of solenoid valve? Here we will discusses the necessity of adding a strainer upstream the solenoid valve.

The solenoid valve is that the coil generates magnetic force to overcome the pressure of spring and then drives the spool to act when it is powered on. The solenoid valve has a simple structure and low cost, but it can only realize open and close.
Electric valve drives the stem through electric actuator, and then drives the spool to act. The electric valve can be divided into shutoff valve and regulating valve. The shutoff valve works in two positions, namely fully open and fully close. Regulating valve can keep it at a position stably through closed loop regulation.

Blockage is the most common fault of solenoid valves. Many causes lead to the blockage of solenoid valve, such as impurities in the flow medium, wrong selection of the solenoid valve model, complex working environment of the solenoid valve. Generally, blockage of solenoid valve can be solved with the following five methods: cleaning, external scouring method, installing the pipe filter, increasing throttling gap, medium scouring method.

What causes a solenoid valve noise? It may be because of the damage of mechanical parts of solenoid valve itself, or due to the working environment.
1. Actual working conditions of the solenoid valve are not within the scope of solenoid valve products.
2. Damage of solenoid valve parts like the spring
3. Low voltage of power supply
4. High pressure of the system2. Damage of solenoid valve parts like the spring

For a two-position direct-acting solenoid valve, it would be no affected if the inlet and outlet are reversely connected. For a two-position pilot-operated solenoid valve, it would also be not affected if the inlet and outlet are reversely installed. Due to the structural requirements of internal flow path, some solenoid valves may not establish the pilot pressure if the inlet and outlet are reversely connected, and the solenoid valves are thereof unable to work properly.

When the coil of solenoid valve is working (electrified), the iron core is attracted to form a closed magnetic circuit. Namely, when the inductance is in the maximum design state, it’s normal for heating of the solenoid. But if the iron core can’t be attracted smoothly when it’s electrified, the solenoid inductance reduces, the impedance decreases, and the current increases, thus leading to excessive current in the coil and affecting its service life. Therefore, oil pollution, impurities and deformation would hinder the movement of iron core and slow down its actions when power on. The iron core may even be unable to be attracted. As a result, the coil impedance is less than its normal state when it’s energized, thus making the solenoid valve coil get hot or heat.

The solenoid valve may be unable to open or close, after it’s powered on. Why? Particularly, the solenoid valve that has used for many years or starts frequently may meet this problem. Faults of the solenoid valve will directly affect the actions of switching valve and regulating valve. One of the common faults is that the solenoid valve doesn’t act, that is, the solenoid valve does not open or close when energized. For this problem, it shall be checked from the following aspects.