Main features of VICKERS solenoid valve

VICKERS solenoid valve and safety valve are integrated to form a pilot operated pressure valve. This valve is both an unloading valve and a safety valve, sometimes also an overflow valve. During unloading, its control oil passage runs through each directional valve, similar to the unloading oil passage mentioned above. When each directional valve is in the neutral position, the control oil passage of the unloading valve runs through each directional valve and is connected to the oil tank. During unloading, most of the oil is unloaded, the channel is short, and the pressure loss is low. When any directional valve works, the control oil passage is cut off, and the oil source enters the actuator from the directional valve, and its working pressure is controlled by the pilot valve. At this time, the system pressure is adjusted by the pilot valve. This unloading method... Even if the number of directional valves increases, only the control oil passage increases, and the unloading pressure does not increase significantly, always maintaining a low unloading pressure. This unloading method is mostly used for manual directional valves, Reliable unloading. The main valve of VICKERS solenoid valve (also known as safety valve) can be divided into three types according to different mating forms: three-stage concentric, two-stage concentric, and slide valve. Among them, the slide valve structure has low working pressure and low control pressure accuracy; Although the three-level concentric structure is mature and widely used, compared with the two-level concentric structure, it is not as sensitive in action, has the same specifications, and has the same stroke. The oil flow capacity of the two-level concentric structure is much greater than that of the three-level concentric structure; The two-stage concentric control pressure is stable and has good processability. The application prospects of the two-stage concentric structure are broad. Here, we discuss its structural dimension design method based on the two-stage concentric structure.

The iron core inside the magnetic sleeve of the VICKERS solenoid valve, VICKERS throttle valve, and VICKERS vane pump in the United States is completed without dynamic sealing, so external leakage is prone to blockage. Electric valve torque control is not easy, which can easily cause internal leakage and even break the valve stem head; The structural type of solenoid valve is easy to control internal leakage until it is reduced to zero. The VICKERS solenoid valve is used for on/off control of liquid and gas pipelines, and is a two position DO control. Generally used for controlling small pipelines. Electric valves are used for analog regulation of medium flow in liquid, gas, and air system pipelines, and are AI controlled. Electric valves can also be used for two position switch control in the control of large valves and air systems. Electromagnetic valves can only be used as switch quantities, are DO controlled, and can only be used for small pipeline control. They are commonly found in pipelines of DN50 and below, and are rarely used above. Electric valves can have AI feedback signals and can be controlled by DO or AO, which are commonly seen in large pipelines and air valves.

Main features of VICKERS solenoid valve

(1) External leakage is blocked, internal leakage is easy to control, and safe to use. Internal and external leakage is a factor that endangers safety. Other self-control valves usually extend the valve stem and control the rotation or movement of the valve core through electric, pneumatic, or hydraulic actuators. All of this needs to solve the problem of long-term leakage of valve stem seals; Only solenoid valves use electromagnetic force to seal the iron core inside the magnetic sleeve of the electric control valve, without dynamic sealing, so external leakage is prone to blockage. Electric valve torque control is not easy, which can easily cause internal leakage and even break the valve stem head; The structural type of solenoid valve is easy to control internal leakage until it is reduced to zero. So, the use of solenoid valves is particularly safe, especially suitable for corrosive, toxic, or high and low temperature media.

(2) The system is simple, easy to connect to a computer, and the price is affordable. The solenoid valve itself has a simple structure and low price, making it easier to install and maintain compared to other types of actuators such as regulating valves. More significantly, the composed self-control system is much simpler and priced much lower. Due to the fact that the solenoid valve is controlled by switch signals, it is very convenient to connect with industrial control computers. In today's era of widespread computer use and significant price reductions, the advantages of solenoid valves are even more apparent. (3) Action express, with minimal power and lightweight appearance. The response time of solenoid valves can be as short as a few milliseconds, and even pilot operated solenoid valves can be controlled within tens of milliseconds. Due to its self-contained circuit, it responds more sensitively than other self-control valves. A well-designed solenoid valve coil has low power consumption and is considered an energy-saving product; It can also automatically maintain the valve position by triggering the action, without consuming any electricity during normal operation. The electromagnetic valve has a small external size, which saves space and is lightweight and beautiful.

(4) The adjustment accuracy is limited and the applicable medium is restricted. Electromagnetic valves usually have only two states: on/off, and the valve core can only be in two extreme positions, which cannot be continuously adjusted. (There are many new ideas trying to break through, but they are still in the experimental stage) Therefore, the adjustment accuracy is still limited to a certain extent. Electromagnetic valves have high requirements for the cleanliness of the medium, and are not suitable for media containing particles. If impurities are present, they must be filtered out first. In addition, viscous media are not suitable, and the viscosity range of media suitable for specific products is relatively narrow.

(5) Diverse models and versatile applications. Although solenoid valves have inherent shortcomings, their advantages are still very prominent, so they are designed into a variety of products to meet different needs and have a wide range of applications. The progress of solenoid valve technology also revolves around how to overcome inherent shortcomings and better leverage inherent advantages. FESTO solenoid valve is an automation basic component used to control the direction of fluid and belongs to the actuator category; Usually used in mechanical control and industrial valves to control the direction of the medium, thereby achieving control of valve opening and closing. The working principle of the solenoid valve is that there is a sealed chamber with through holes at different positions, each hole leading to a different oil pipe. The middle of the chamber is a valve, and there are two electromagnets on both sides. The magnetic coil on which side is energized will attract the valve body to which side. By controlling the movement of the valve body, different oil discharge holes will be blocked or leaked out. The oil inlet hole is normally open, and hydraulic oil will enter different oil discharge pipes. Then, the pressure of the oil will push the piston of the cylinder, which in turn drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical motion is controlled by controlling the current on and off of the electromagnet.

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