What are the functions of cartridge valves and the working principle of cartridge valves

Cartridge valves are generally not able to perform all functions on their own, but must be placed in a valve cavity to complete the required functions together with other valves or alone. Generally play a system protection role t;

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Cut-off valve: The shut-off valve, also known as the shut-off valve, is used to turn on or off the medium in the pipeline. Cut-off valves include gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragms.

Check valve: Check valve, also known as check valve or check valve, is used to prevent the backflow of media in the pipeline. The foot valve of the suction off of the water pump also belongs to the category of check valves.

Safety valve: The function of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection. y#r(

u&c (control valve: control valve category includes control valve, throttle valve and pressure reducing valve, its function is to regulate the pressure and flow rate of the medium.

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Diverter valves: Diverter valves include various distribution valves and traps, etc., which are used to distribute, separate or mix the medium in the pipeline. On the cartridge valve valve plate, it can be combined at will to realize the control of different functions, which is convenient and diverse!

Cartridge valves can be composed of various types, such as pressure control, speed control, etc.

The working principle of the cartridge valve is that the cartridge element is installed in the cartridge block and can be moved axially freely. Control the opening and closing of the cartridge and the amount of opening, and can control the oil flow direction, pressure and flow rate of the main oil circuit liquid.

The cartridge is composed of a valve core, a valve body, a spring and a seal, etc., and can be a pop valve structure or a slide valve structure. The cartridge part is the main body of the cartridge valve, the cartridge element is hollow cylindrical, the front end is a combination of conical sealing surface, and the structure of the cartridge valve with different performance is different, such as the cone end of the cartridge valve core can be the cone surface of the plugging, and there is also a conical surface with damping holes or triangular grooves.

The cartridge valve control cover is composed of various miniature pilot control components (such as shuttle valves, check valves, plug-in regulators, etc.) and other components embedded in the cover. The embedded miniature pilot control elements are combined with the pilot control valve to control the working state of the cartridge by selling the trembling hand; Various sensors to detect the working status of the cartridge can also be installed on the control cover.

According to the different control functions, the control cover can be divided into three categories: direction control cover, pressure control cover and flow control cover. When it has more than two functions, it is called a composite control cover.

The main function of the control cover plate is to fix the cartridge parts, communicate the connection between the control oil circuit and the control cavity of the main valve, etc.

cartridge valve principle; The control port controls the opening and closing of the oil port of the main oil circuit, and through the opening and closing of the valve core of the main valve, it can control the opening and closing of the main oil circuit. The use of different pilot valves can be used to form pressure control, directional control or flow control, or to form a combination control. When the control port is connected with the oil tank, the poppet valve opens the port and communicates, so the pilot control valve can be used to relieve pressure or pressurize to realize the opening and closing of the poppet valve.

The combination of pop valve and small flow pure ruler solenoid valve can constitute a directional valve, the combination of pop valve and various pilot pressure valves can be constituted, a variety of pressure control valves, a pop valve is correspondingly equipped with a solenoid valve and a pilot pressure valve or take speed regulation measures, which can play the role of a reversing valve, pressure valve or throttle valve in the system.

Principle: For a cartridge valve of a certain specification, for example, for mass production, the size of the valve port is uniform. In addition, valves with different functions can use the same chamber, e.g

Check valves, poppet valves, flow control valves, throttle valves, two-position solenoid valves, etc. If the valves of the same specification and different functions cannot use different valve bodies, then the processing cost of the valve block is bound to increase, and the advantages of cartridge valves no longer exist.

Cartridge valves have been widely used in a variety of construction machinery, material handling machinery and agricultural machinery. In an industry that is often overlooked, the use of cartridge valves is constantly expanding. Especially in many applications where weight and space are limited, traditional industrial hydraulic valves are helpless, while cartridge valves are in full swing.

In some applications, cartridge valves are the only option to increase productivity and competitiveness.

The cartridge valve is characterized by:

1. Simple structure, large flow capacity, suitable for all kinds of high-pressure and high-flow systems;

2. Change different pilot control valves and cover plates, the functions of different valves can be easily realized, and the structure of the cartridge main valve remains unchanged, which is convenient for standardization;

3. Valves with different functions can be inserted in an integrated valve body, and the channel between the valve and the valve is linked through the oil hole inside the valve body, which realizes the pipeless link, reduces leakage, occupies a small area, and is convenient for integration;

4. The pilot control valve has small power and obvious energy-saving effect.

cartridge valves: threaded cartridge valves and cover cartridge valves;

Threaded cartridge valve: suitable for control with small flow, high integration and complex functions;

The cartridge valve is different from the ordinary hydraulic control valve we are talking about, its flow rate can reach 1000L min, and the diameter can reach 200 250mm. The spool structure is simple, the action is sensitive, and the sealing performance is good. Its function is relatively simple, mainly to realize the on-off or breaking of the hydraulic path, and when combined with the ordinary hydraulic control valve, the control of the oil direction, pressure and flow of the system can be realized.

Cartridge valve basic components.

The assembly consists of a spool, sleeve, spring, and sealing ring. According to different uses, it is divided into directional valve assembly, pressure valve assembly and flow valve assembly. The three components of the same bore have the same installation size, but the structure of the spool and the diameter of the sleeve seat are different.

All three components have two main ports A and B, and one control port X.

Introduction to the catalog.

Cartridge valve basic components.

cartridge valve principle;

According to the cartridge valve with damping hole, when A enters the oil, it will be damped to X (C cavity) through the center of the spool, when the pressure of C cavity is equal to A cavity, the valve core is closed by spring force, A and B can not communicate, when the pressure of C cavity is less than that of A cavity, the high-pressure oil overcomes the spring force, A and B communicate.

This kind of general we generally use as a pressure valve, X port to control the pressure of the C cavity to achieve his role, but also a is the valve core without damping holes, A is the oil inlet high-pressure oil port, X oil inlet, C cavity is the control oil, generally with the electromagnetic reversing valve to control and A cavity through, to achieve the valve core can not be opened (A, B communication and closing).

The cartridge valve is equivalent to an electrical diode and can only be made unidirectionally. However, with different pilot penalties, different functions can be achieved. For example, with the addition of a pressure valve pilot, it can be used as a main pressure valve.

It can also be used as a hydraulically controlled check valve or as a directional control valve after combination.