What are the hydraulic valves? How does it work?

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.

Classified by control method: manual, electronically controlled, hydraulic-controlled.

Classification by function: flow valve (throttle valve.

Speed control valves, diverter and collector valves), pressure valves (relief valves, pressure reducing valves.

Sequential valves, unloading valves), directional valves (solenoid reversing valves.

Manual reversing valves, check valves, hydraulic check valves).

According to the installation method: plate valve, pipe valve, superimposed valve, threaded cartridge valve, cover valve.

According to the operation mode: manual valve, motorized valve, electric valve, hydraulic valve, electro-hydraulic valve, etc.

Orientation control. According to the application, it is divided into check valve and reversing valve. Check Valve:

Only the fluid is allowed to be connected in one direction in the pipeline, and the reverse is cut off. 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. In the late 60s, on the basis of the above-mentioned hydraulic control valves, electro-hydraulic proportional control valves were developed.

Its output (pressure, flow) can be continuously changed with the input electrical signal. According to different functions, electro-hydraulic proportional control valves are correspondingly divided into electro-hydraulic proportional pressure control valves, electro-hydraulic proportional flow control valves and electro-hydraulic proportional directional control valves.

Including pressure control valves, relief valves, throttle valves, and check valves, etc., there are many categories, in fact, to talk about the working principle, to put it bluntly, it is to control the flow rate and so on.

Introduction: Hydraulic valve belongs to a kind of automation element commonly used in the industry through pressure control, the hydraulic valve is mainly controlled by the internal pressure oil when working, and can be controlled by the long-distance hydropower pipeline through the cooperation with the pressure distribution valve. How does a hydraulic valve work?

What are the characteristics of hydraulic valves, you can take a look at the following introduction.

The hydraulic valve is mainly used to control the liquid pressure and flow direction in the hydraulic system, and the pressure and flow direction can be controlled more accurately when the hydraulic valve is controlled. How does a hydraulic valve work? It is mainly through the programmable control system to make the central link of the equipment, which is operated by program execution when operating, and can achieve better control effect through the change of PLC data when used.

Hydraulic valve working principle

The working principle of the hydraulic valve is mainly to cooperate with the electrical operation and the actuators, which can play a good stability when working, and can control the supporting workpieces for the needs of different customers, and can also be arbitrarily expanded for the working parameters of the equipment, so as to meet the requirements of one machine for multiple purposes. The equipment can quickly eliminate some faults through the perfect self-diagnosis system, especially through the display of dynamic waveforms, which can quickly analyze the errors in the size of the workpiece and the burr defects on the surface.

What are the characteristics of hydraulic valves?

First, it can achieve efficient electromagnetic action. The built-in push rod of the equipment can quickly play a cushioning effect, and can still ensure smooth and silent operation under the action of high pressure, and the inside of the equipment has a sliding core, which can quickly eliminate the oil leakage caused by friction between the push and grip rods.

Second, most of the valve bodies of hydraulic valves are specially designed, which can make the internal impedance smaller, so that energy can be used efficiently, which is very consistent with the current energy-saving concept, so it has been praised by more people.

Thirdly, the hydraulic valve can reduce the failure of the equipment through the control of the oil temperature, thereby saving most of the maintenance costs, because the internal temperature is controlled within a reliable range through the intelligent system, so there will be no errors in machining accuracy due to excessive heat.

The working principle of the hydraulic valve and the characteristics of the hydraulic valve have been comprehensively introduced in the above, the installation of the hydraulic valve is also very convenient, most of the methods used are screw fixing, when there is a problem, it can be quickly disassembled and assembled, and the space reserved for the electrical wiring inside the equipment is relatively large, which can be tested and wired in more aspects, and the wiring is also waterproof and dustproof to ensure that the equipment is used for a long time without failure.

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With the progress of science and technology and the rapid development of machinery manufacturing industry, hydraulic control valves are also widely used in production and life, such as construction machinery, machine tool equipment, color tile equipment, hydraulic pump stations, carton machinery, etc. There may be some people who don't know about hydraulic control valves, so let's popularize them for everyone.

Hydraulic control valve spine.

1. What is a hydraulic control valve.

Hydraulic control valve (referred to as the principle of hydraulic valve in the hydraulic system is to control and adjust the flow direction, pressure and flow of oil in the hydraulic system, so that the working mechanism that executes the Sakura collapser and its drive obtains the required thrust moment), movement direction and movement speed. Any hydraulic system, no matter how simple it is, can not lack hydraulic valves, hydraulic mechanical equipment with the same process function, through the different combination of hydraulic valves, can form a variety of hydraulic system schemes with different oil circuit structures. Therefore, hydraulic valve is a part (element) with many varieties and specifications, wide application and active in hydraulic technology; Whether a newly designed or operating hydraulic system can operate normally and reliably according to the established requirements depends to a large extent on the performance of the various hydraulic valves used in it and whether the parameters are reasonably matched.

Hydraulic control valve principle.

Second, the principle and application of hydraulic control valves.

The hydraulic water level control valve is a kind of hydraulic control valve that automatically controls the liquid level height of the water tower and the water tank. When the water surface drops more than the preset height, the float valve is opened, the pressure of the upper chamber of the piston is reduced, and the pressure difference between the piston and the piston is formed, and the valve disc is opened for water supply operation under the action of this pressure difference; When the water level rises to the preset height, the float valve is closed, and the pressure in the upper chamber of the piston continues to increase, causing the disc to close and stop the water supply. In this way, the reciprocating automatic control of the liquid level at the set height realizes the automatic water supply function.

The product is mostly used in the automatic water supply system of various water tanks (pools) and water towers in civil buildings and industrial and mining enterprises, and can be used as a circulating water supply control valve for atmospheric boilers.

Hydraulic control valve applications.

Today's knowledge popularization is here, do you know a thing or two about hydraulic control valves? It is also common sense that this kind of industrial equipment is not familiar, and the follow-up will continue to update more content about life and home, so stay tuned!

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 the user's stove.

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 changing rapidly, and the rankings may vary by time and region. For the latest ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

There are two types of pressure reducing valves: direct-acting and pilot-operated, and the pilot-operated type is generally used.

The pressure reducing valve is a pressure control valve that uses the principle of liquid flow through the gap to produce a pressure drop, so that the outlet oil pressure is lower than that of the inlet oil pressure to meet the needs of the actuator.

From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can change, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then, relying on the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve is kept constant within a certain error range.

The pressure reducing valve is to reduce the water pressure by the local resistance of the flow channel in the valve, and the range of water pressure drop is automatically adjusted by the membrane connected to the valve disc or the water pressure difference between the inlet and outlet on both sides of the piston. The principle of fixed-ratio pressure reduction is controlled by the water pressure ratio of the floating piston in the valve body, and the pressure reduction ratio at the inlet and outlet ends is inversely proportional to the area ratio of the piston at the inlet and outlet sides.

This type of pressure reducing valve works smoothly and without vibration; There is no spring in the valve body, so there is no worry about spring rust and metal fatigue failure; The sealing performance is good and there is no leakage, so it reduces both dynamic pressure (when water flows) and static pressure (when the flow rate is 0); In particular, the pressure is reduced without affecting the water flow.

1. The hydraulic valve is an automatic element operated by the pressure of Zheng Li 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 to control the oil, gas and water pipeline system of the hydropower station from a distance. There are direct type and pilot type.

2. The hydraulic valve is used to control the flow direction of the oil in the hydraulic system or adjust its pressure and flow, which can be divided into three categories: directional valve, pressure valve and flow valve. A valve of the same shape has different functions due to different mechanisms of action.

3. The pressure valve and the flow valve control the pressure and flow of the system by using the throttling effect of the flow section, while the directional valve controls the flow direction of the oil by replacing the flow channel. There are various different types of hydraulic valves, and there are some basic commonalities.

Hydraulics is based on Pascal's Law: the pressure on a sealed liquid is transmitted in all directions without changing the size of the mask. Then a small force is applied on a piston with a small area, because it is the pressure that is propagated, so a greater force will appear on the piston with a large area on the other side.

Beijing Chuhai Technology focuses on hydraulic system design and hydraulic components**one-stop service.

It consists of two tanks of different sizes, filled with water or oil. The one that fills the collapsed water is called a "hydraulic press"; The oil-filled one is called a "hydraulic press". Each of the two cylinders has a piston that can slide, and if a certain amount of pressure is added to the small piston, according to Pascal's law, the small piston transmits this pressure through the pressure of the liquid to the large piston, and the large piston is pushed up.

Let the cross-sectional area of the small piston be s1, and the downward pressure applied to the small piston is f1. As a result, the pressure of the small piston on the liquid is p=f1 si, and it can be transmitted by the liquid in all directions without changing the size." The pressure experienced by the large piston must also be equal to p.

If the cross-sectional area of the large piston is s2, the upward pressure f2 = pxs2 generated by the pressure p on the large piston

The cross-sectional area is a multiple of the cross-sectional area of the small piston. From the above formula, adding a small force to the small piston will get a large force on the large draft piston, for which a hydraulic press is used to press plywood, extract oil, extract heavy objects, forge steel, etc.