High-speed solenoid valve classification, high-speed solenoid valve characteristics

Classification of high-speed solenoid valves 1. According to the movement form of the valve core, it can be divided into: slide valve, ball valve, poppet valve, flat valve, etc. The ball valve type structure has a simple structure, reliable sealing, good craftsmanship, short stroke, sensitive action, large area gradient and small motion friction, so the dynamic characteristics are also good, and it is a commonly used valve core structure. However, the hydraulic force acting on the steel ball due to the ball valve structure is unbalanced. In the reference literature, a simulation study was conducted on the hydraulic power of a two-position three-way ball valve. Due to the influence of hydraulic power, it can only be made into a small diameter valve. In situations with large flow requirements, it is often used as a pilot valve to form a two-stage on-off valve structure, which reduces the dynamic response speed of the on-off valve. Through the high and low pressure balance design, the poppet valve structure can eliminate the influence of hydraulic power and overcome the problem of hydraulic pressure imbalance in the ball valve structure. It is an ideal valve core structure for high-speed switching valves. However, due to limitations of process performance, generally only two-position high-speed on-off valves are made, while two-position three-way high-speed on-off valves are relatively rare. In order to make the two cones of the two-position three-way poppet valve To ensure reliable sealing, the front and rear valve seats are required to have strict coaxiality. For some high-speed switching valves working in high-pressure and high-frequency special environments, in order to ensure reliable sealing and the valve core is not stuck, The processing accuracy requirements are very high, the processing is difficult, the manufacturing cost is high, and it is difficult to adjust the working gap of the switch valve. Flat plate valves are not easy to achieve static force balance and are generally only used in small diameter or low pressure situations. 2. According to different working hours, it can be divided into: direct drive mode, the driving current of the solenoid valve is the same as the valve opening waveform, the valve core is reset by the spring, generally used for ordinary electromagnetic components;impulse voltage drive mode, in order to improve the valve opening For rapid action, an impact current is added at the moment of valve action to make it change direction quickly. After the valve moves, the current stabilizes at a smaller value to position the valve core;the pulse drive mode passes strong current at the moment of valve action. Current, once the valve action is completed, the valve core is automatically in the positioning state. The valve with this structure has bistable working characteristics, that is, it has a memory function. This kind of valve uses pulse width modulation for the position of the valve core, and pulse frequency for the current signal. Modulation, from the perspective of reducing heat generation and rapidity, the pulse drive method is the most advantageous. The characteristics of the high-speed solenoid valve are simple and compact structure: the steel ball in the ball valve assembly is an ordinary steel ball, and the valve seat has two coaxial stepped holes. The steel ball is placed in the large hole to limit the radial movement of the steel ball. There is an opening around the large hole. Four symmetrical grooves serve as fluid channels. There is a uniform sealing ring with a width of about 0.1mm at the step between the large hole and the small hole. The opening of the ball valve is guaranteed by the optional separation pin length. Compared with ordinary slide valves, it has the advantages of small valve core mass, simple and compact structure, and easy processing. Fast response speed: The switch-type small mass ball valve creates conditions for improving its response speed. In addition, a larger electromagnetic thrust is obtained through the armature to improve the response speed. The valve has taken the following measures to improve its thrust: using materials;reducing the air gap between the armature and the pole shoe;and increasing the ampere-turns of the coil. Good repeatability: The high-speed solenoid valve works as a switch, and the repeatability is definitely good. Strong anti-pollution ability: Compared with ordinary slide valves, the radial clearance of the high-speed switching valve's mating coupling is larger, there is no pressure difference at both ends of the mating section of the coupling, and the ball valve has a larger opening, so it has stronger resistance to pollution. pollution capacity. Long service life: The high-speed on-off valve uses the pressure difference between the oil supply port and the control port to return the ball valve, replacing the return spring in ordinary valves, greatly increasing the service life of the valve. The valve has a design life of 100 million times and a test life of more than 200 million times. The above is the classification of high-speed solenoid valves and the introduction of the characteristics of high-speed solenoid valves. If you want to know more related information, please log in to Sunway Pneumatic www.diancifa.cc to view.