The working principle of electro hydraulic valves, the working principle of solenoid valves for wate

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The liquid is switched on and off by the movement of the electromagnet.

The working principle is: when water needs to be passed, an electrical signal is given to the solenoid valve, and the electromagnetic force is obtained with the help of the solenoid valve coil, and the valve core in the solenoid valve body is sucked up, and the water can pass through. When water is not needed, cut off the power supply of the solenoid valve, and the valve core in the valve body of the solenoid valve is tightly blocked by the effect of the spring, so as to achieve the purpose of artificial water control.

The schematic diagram of the hydraulic solenoid valve is as follows:

There are a plurality of different oil interfaces on the valve body of the solenoid reversing valve, and each oil interface is communicated with the corresponding annular groove on the valve body, and several oil interfaces are called several valves. Hydraulic machinery generally uses four-way hydraulic solenoid directional valves.

After the valve core moves, it can stay in different operating directions, and the valve core has several operating directions called several valves. For example, the valve core of the C2 function electromagnetic reversing valve has 3 operating directions, and there are 4 oil connections on the valve body, and the valve is called a three-position four-way electromagnetic reversing valve. The different oil connections are switched on or off through the working position of the spool.

Generally, the interface between the hydraulic solenoid valve and the oil supply oil circuit of the hydraulic system is indicated by P, the interface connected with the oil return oil circuit is indicated by T, and the oil port connected with the fulfillment element is indicated by A and B. The valve body of Litian hydraulic electromagnetic directional valve has the identification of the oil port.

The structure of hydraulic check valve can be divided into straight-through check valve and right-angle check valve according to the layout of the inlet and outlet channels, and the straight-through inlet and outlet channels are on the same axis.

The structure of the straight-through hydraulic check valve is simple, but the loss of hydraulic pressure is large, and it is inconvenient to replace the tension spring during repair. The right-angle hydraulic check valve has a messy structure, but the pressure loss is small.

1. Principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat and open the valve; When the power is off, the electromagnetic force disappears, and the spring presses the Lammon shut-off on the valve seat, and the valve closes.

2. The solenoid valve is the basic element of automation used to control the fluid, which belongs to the actuator; It is not limited to hydraulics, pneumatics. Solenoid valves are used to control the direction of hydraulic flow, and the machinery of the factory is generally controlled by hydraulic steel, so solenoid valves are used.

3. The working principle of the solenoid valve: there is a closed cavity in the solenoid valve, there are through holes in different positions, each hole is connected to a different oil pipe, the middle of the cavity is a piston, and there are two electromagnets on both sides, which side of the magnet coil energized valve body will be attracted to which side, open or close different oil drain holes by controlling the movement of the valve body, and the oil inlet hole is normally open, the hydraulic oil will enter different oil drain pipes, and then the piston of the cylinder is blindly pushed by the pressure of the oil, and the piston rod drives the piston rod, and the piston rod drives the mechanical assembly and tease. In this way, the mechanical movement is controlled by controlling the current interruption of the electromagnet.

Brand model: Huawei MateBook D15

System: Windows 11

Electric valves usually consist of electric actuators and valves. The electric valve uses electrical energy as the power to drive the valve through the electric actuator to realize the opening and closing action of the valve. So as to achieve the purpose of switching the pipeline medium.

Solenoid valves are a type of electric valves; It is to use the magnetic field generated by the electromagnetic coil to pull the valve core, thereby changing the on-off of the valve body, the coil is powered off, and the valve core is returned by the pressure of the spring. The motorized valve is used for the analogue regulation of the flow of medium in the pipes of liquids, gases and wind systems, and is AO controlled. In the control of large valves and wind systems, electric valves can also be used for two-position switch control.

The electric device of an electric valve is one of the devices used to operate the valve and connect to the valve. The device is driven by electricity and its movement can be controlled by the amount of stroke, torque or axial thrust. Because the working characteristics and utilization rate of valve electric devices depend on the type of valve, the working specification of the device and the position of the valve on the pipeline or equipment.

Therefore, master the correct choice of valve electric device; It is important to consider the prevention of overload (the operating torque is higher than the control torque).

The opening and closing parts of the gate valve are the gate plate, the direction of movement of the gate plate is perpendicular to the fluid direction, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled.

When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, the sealing surface of the ram plate is pressed to the valve seat on the other side by relying on the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the ram should be forcibly pressed against the valve seat by external force to ensure the tightness of the sealing surface. The gate plate of the gate valve moves in a straight line with the valve stem, which is called the lifting rod gate valve and also called the open rod gate valve.

Usually there is a trapezoidal thread on the lifting rod, which changes the rotary motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, the operating torque into operating thrust. When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation.

In actual use, it is marked by the apex of the valve stem, that is, the position that cannot be opened, as its fully open position. In order to account for the lock-up phenomenon of temperature changes, it is usually rewound back to the apex position and then reverses 1 2 1 turns as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the ram, that is, the stroke.

Some gate valves, the stem nut is located on the gate, and the handwheel rotates to drive the valve stem to rotate, and the gate is lifted, this valve is called the rotary rod gate valve or the dark rod gate valve. How a gate valve works.

1. The electric valve is usually connected by an electric actuator and a valve, and becomes an electric valve after installation and commissioning. The electric valve uses electric energy as the power to connect the electric actuator to drive the valve, and realize the opening and closing and adjusting of the valve. So as to achieve the purpose of switching or adjusting the pipeline medium.

2. The drive of 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. Relatively resistant to voltage shocks. The solenoid valve is quick to open and close quickly, and is generally used in places with small flow and low pressure and large switching frequency; Electric valves are reversed.

The opening of the electric valve can be controlled by the experience, and the state is open, closed, half-open and half-closed, which can control the flow of the medium in the pipeline and the solenoid valve can not meet this need. The three-wire electric valve has three lines, F and N, F stands for forward action (or open action) control line, R stands for reverse action (or close action) control line, and N stands for ground line. Solenoid valves are a type of electric valves; It is to use the magnetic field generated by the electromagnetic coil to pull the valve core, so as to change the on-off of the valve body, the coil is powered off, and the valve core is retracted by the pressure of the spring.

According to the application, it is divided into check valve and reversing valve. Check valve: only allow the fluid to be connected in one direction in the pipeline, and cut off in the reverse.

Reversing valve: change the on-off relationship between different pipelines. According to the number of working positions of the valve core in the valve body, it is divided into two and three places; According to the number of channels controlled, it is divided into two-way, three-way, four-way, five-way, etc.; According to the spool drive mode, it is divided into manual, motorized, electric, hydraulic, etc.

Figure 2 shows the working principle of the three-position four-way directional valve. P is the oil supply port, O is the oil return port, and A and B are the output ports leading to the actuator. When the valve core is in the center, all the oil ports are cut off, and the actuator does not move; When the spool is moved to the right position, P and A are passed, and B and O are passed; When the spool is moved to the left position, P and B pass, and A and O pass.

In this way, the actuator can move forward and backward.

Hydraulic valve is an automatic element operated with pressure oil, which is controlled by the pressure oil of the pressure distribution valve, and is usually used in combination with the electromagnetic pressure distribution valve, which can be used to remotely control the on/off of the oil, gas and water pipeline system of the hydropower station. It is often used in clamping, control, lubrication and other oil circuits. There are direct type and pilot type, and the pilot type is mostly used.

Hydraulic valves are divided into hydraulic reversing valves, manual reversing valves, multi-way reversing valves, pressure control valves, cartridge valves, relief valves, pressure reducing valves, sequential valves, throttle valves, speed regulating valves, cartridge valves and other valves. Wherein the control of pressure is called pressure control valve, the control of flow is called flow control valve, and the control of switching and flow direction is called direction control valve.

Working principle: speed regulating valve: the speed regulating valve is made of throttling and differential pressure reducing valve in series, mainly used to adjust the movement speed of the actuator, and make its speed stable, it is not only a regulating element, but also a detection element, the differential pressure reducing valve and the throttle valve can be in the front, can also be in the rear.

Cartridge valve: Cartridge valve is different from the commonly said ordinary hydraulic control valve, its spool structure is simple, the action is sensitive, and the sealing is good. However, relatively speaking, the function is relatively few, mainly to realize the on-off or breaking of the hydraulic path, and only when combined with the ordinary hydraulic control valve, can the control of the oil direction, pressure and flow of the system be realized.

hydraulic reversing valve; Hydraulic directional valve is a reversing valve that uses the pressure oil to control the oil circuit to change the position of the valve core, which is very convenient to operate and has a large starting force. However, when the flow rate of hydraulic control oil is large, the reversing impact will also be larger. Therefore, in order to control the speed of movement of the spool, the impact is reduced.

A one-way throttling device (damping regulator) is usually installed in front of the hydraulic pressure port.

Manual reversing valve: The manual reversing valve is a manual lever-operated directional control valve, which plays the role of reversing (changing the direction of liquid flow) and switching (turning on or off liquid flow) in the hydraulic system. It is easy to operate, reliable and does not require electronics.

It can be said that the installation and use are very simple. The disadvantage is that it can only be operated by hand, and the degree of automation is not high.