The difference between solenoid valve and electric valve

1. Switch form:

    The solenoid valveis driven by a coil and can only be opened or closed, and the action time is short when switching.

    The electric valve is generally driven by a motor, and it takes a certain amount of time to simulate the opening or closing action, which can be adjusted.

2. Nature of work:

    Solenoid valves generally have a small flow coefficient and a small working pressure difference. For example, the flow coefficient of a 25-caliber solenoid valve is much smaller than that of a 15-caliber electric ball valve.

    Electric valves are generally driven by motors, which are more resistant to voltage shocks. Solenoid valves open and close quickly, and are generally used in places with small flow and low pressure, where high switching frequency is required, and electric valves are the opposite.

3. Applicable process:

    Solenoid valves are suitable for some special process requirements, such as leakage, special fluid medium, etc., and the price is more expensive.

    Electric valves are generally used for regulation, and there are also switches, such as: the end of the fan coil unit.

Main features of solenoid valves:

    (1) The external leakage is blocked, the internal leakage is easy to control, and it is safe to use. Internal and external leakage is an element that endangers safety. Other automatic control valves usually extend the valve stem, and the rotation or movement of the spool is controlled by electric, pneumatic, or hydraulic actuators. This has to solve the problem of external leakage of the dynamic seal of the long-term action valve stem; only the solenoid valve is completed by using electromagnetic force to act on the iron core sealed in the magnetic isolation sleeve of the electric control valve. There is no dynamic seal, so the external leakage is easy to block.

    (2) The system is simple, easy to connect to the computer, and the price is low.The solenoid valve itself has a simple structure and low price, and is easier to install and maintain than other types of actuators such as regulating valves. What's more remarkable is that the composed automatic control system is much simpler and the price is much lower. Since the solenoid valve is controlled by a switch signal, it is very convenient to connect with the industrial computer. In today's era when computers are popular and prices have dropped sharply, the advantages of solenoid valves are even more obvious.

    (3) Express action, small power, and light appearance. The response time of the solenoid valve can be as short as several milliseconds, and even the pilot solenoid valve can be controlled within tens of milliseconds. Due to its self-contained circuit, it is more sensitive than other automatic control valves. The power consumption of a properly designed solenoid valve coil is very low, which is an energy-saving product; it can also be achieved by triggering the action and automatically maintaining the valve position without consuming any power at ordinary times. The shape and size of the solenoid valve are small, which not only saves space, but also is light and beautiful.

    (4) The adjustment accuracy is limited and the applicable medium is limited. Solenoid valves usually only have two states of switch, the spool can only be in two limit positions, and cannot be adjusted continuously. (There are many new ideas trying to break through, but they are still in the trial stage.) Therefore, the adjustment accuracy is still limited.

    (5) Diverse models and wide range of uses. Although solenoid valves have inherent deficiencies, their advantages are still very prominent, so they are designed into a variety of products to meet various needs and have a wide range of uses. The advancement of solenoid valve technology also revolves around how to overcome inherent deficiencies and how to better utilize inherent advantages.