What are the types of hydraulic valve plate connections?

Classified by control method: manual, electronically controlled, hydraulic-controlled; Classified by function: flow valve (throttle valve, speed control valve, diversion collection valve), pressure valve (relief valve, pressure reducing valve, sequential valve, relief valve), directional valve (solenoid reversing valve, manual reversing valve, check valve, hydraulic control check valve); According to the installation method:

Plate valves, tubular valves, stacking valves, threaded cartridge valves, cover valves. According to the use, it is divided into relief valves, pressure reducing valves, and sequential valves. Relief valve:

It can control the hydraulic system to maintain a constant state when the set pressure is reached. The relief valve used for overload protection is called a safety valve. When the system fails and the pressure rises to a limit that can cause damage, the valve port opens and overflows to ensure the safety of the system.

Pressure reducing valve: It can control the branch circuit to obtain a stable pressure lower than the oil pressure of the main circuit.

The flow valve is suitable for the water system that needs to be controlled by flow, especially for the flow control of non-corrosive liquid media such as heating and air conditioning; Installed in the water system, the system flow rate can be automatically constant at the required set value after a single adjustment before operation. The working principle of the 200x type pressure reducing valve (adjustable pressure reducing valve) is that the outlet pressure can be set through the valve spring: when the valve is fed water from the inlet end, the water flows through the needle valve into the main valve control room, and the outlet pressure acts on the pilot valve through the conduit.

When the outlet pressure is higher than the spring set value of the pilot valve, the pilot valve is closed. A hydraulically controlled check valve is a valve that can make the check valve flow in reverse direction by controlling the fluid pressure. This kind of valve occupies an important position in the hydraulic support equipment of coal mining machinery.

The difference between the hydraulic check valve and the ordinary check valve is that there is an additional control oil circuit K, when the control oil circuit is not connected to the pressure oil, the hydraulic check valve works like an ordinary check valve, and the pressure oil only flows from the oil inlet to the oil outlet, and cannot flow in reverse.

According to the different pressure functions it controls, the pressure reducing valve can be divided into a constant pressure reducing valve (the output pressure is a constant value), a differential pressure reducing valve (the difference between the input and output pressure is a fixed value) and a constant ratio pressure reducing valve (the input and output pressure are kept in a certain proportion). Sequential valve: It can make one actuator (such as hydraulic cylinder, hydraulic motor, etc.) act, and then make other actuators act in order.

The pressure generated by the oil pump first promotes the movement of the hydraulic cylinder 1, and simultaneously acts on the area a through the oil inlet of the sequential valve, when the hydraulic cylinder 1 movement is completely completed, the pressure rises, and after the upward thrust acting on the area a is greater than the setting value of the spring, the valve core rises and makes the oil inlet and the oil outlet communicate, and the hydraulic cylinder 2 moves. 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.

The flow rate is regulated by adjusting the area of the throttle between the spool and the valve body and the local resistance it generates, thereby controlling the speed of movement of the actuator. There are 5 types of flow control valves according to their application. Throttle valve:

After adjusting the area of the orifice, the movement speed of the actuator with little change in load pressure and low motion uniformity requirements is basically stable. Speed control valve: when the load pressure changes, it can keep the inlet and outlet pressure difference of the throttle valve as a fixed value.

In this way, after the throttle area is adjusted, the speed control valve can keep the flow through the throttle unchanged regardless of the change of load pressure, so that the movement speed of the actuator is stable. Diverter valve: Regardless of the size of the load, the two actuators of the same oil source can obtain the same flow rate as the same amount of diverter valve or synchronous valve; The proportional flow rate is obtained by the proportional diverter valve.

Manifold Valve: Acts in opposition to the diverter valve, distributing the flow into the manifold proportionally. Diverter Manifold Valve:

It has both the functions of a diverter valve and a collector valve.

According to the classification of hydraulic spool structure, there are three categories: shut-off type, sliding column type and coaxial shut-off type.

1) Characteristics of shut-off directional valves.

1) It is suitable for the occasion of large flow rate: due to the short stroke of the valve and the small flow resistance, the valve with the same diameter specification is smaller than the sliding column type.

2) The valve core is always subject to back pressure, which is beneficial to the seal: the requirements for air purification treatment are low.

3) At high pressure or large flow, the required reversing force is larger, and the reversing impact force is larger: therefore, the globe valve often adopts a balanced spool structure or uses a large control piston to make the valve reversible' and the large-bore globe valve should adopt the pilot control mode.

4) At the moment of reversing the globe valve, the input door, output port and exhaust port may be connected at the same time and the phenomenon of gas channeling

2) Characteristics of sliding column type reversing valve.

1) When the valve is at rest, the air pressure acting on the spool remains axially balanced. The valve is easy to realize the memory function, and the switching force of the valve reversal is small.

2) Strong versatility: This structure is easy to design into a multi-position multi-port valve

3) The requirements for air purification treatment are high, and the compressed air with oil mist lubrication on the right should be used (unless it is a reversing valve without oil lubrication);

3) Characteristics of coaxial globe valves.

The spool structure of coaxial globe valve has the advantages of both globe type and sliding column type, and avoids its shortcomings.

Reversing valves, pressure control valves, flow control valves.

1. Flange connection: There are flanges at both ends of the valve body, which correspond to the flanges on the pipeline, and are installed in the pipeline by bolting the flanges. Flange connection is the most widely used form of connection in valves. Flanges have convex (RF), flat (FF), convex and concave (MF), etc.

2. Clamp connection: the valve is installed in the middle of the two flanges, and there are usually positioning holes on the valve body to facilitate installation and positioning, and the valve and the two pipes are directly clamped together with bolts.

3. Welding connection: The two ends of the valve body are processed into butt welding grooves according to the requirements of butt welding welding, and the sedan car corresponds to the pipe welding groove, which is fixed on the pipeline through Zen welding.

4. Socket welding: The two ends of the valve body are processed according to the requirements of socket welding, and are connected with the pipeline through socket welding.

5. Threaded connection: Threaded connection is a simple connection method, which is often used for small valves. The valve body is processed according to the standard of each thread, and there are two kinds of internal threads and external threads. Corresponds to the thread on the pipe.

6. Clamp connection: This is a quick connection method, it only needs two bolts, and it is suitable for low-pressure valves that are often disassembled. Such as sanitary valves.

7. Internal self-tightening connection: The above connection forms are all used by external force to offset the pressure of the medium and achieve sealing. The following describes the self-tightening connection form that uses the pressure of the medium.

Its sealing ring is installed at the inner cone, and the side facing the medium is at a certain angle, the pressure of the medium is transmitted to the inner cone, and then to the sealing ring, on the cone surface at a certain angle, two components are generated, one is parallel to the center line of the valve body outward, and the other is pressed to the inner wall of the valve.

Here are some 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, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only the role of estimation and banquet reference, 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 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 changing 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.

There can be the following three classifications: (1) Spool valves, the spool is cylindrical, and the size of the liquid flow path opening is changed by the sliding of the spool in the valve body hole, so as to realize the control of liquid flow pressure, flow rate and direction.

2) poppet valves, poppet valves include poppet valves, ball valves, flat valves, etc., which use the movement of the valve core relative to the seat hole to change the size of the liquid flow path opening, so as to realize the control of liquid flow pressure, flow and direction.

3) Nozzle baffle valve, nozzle baffle valve is a valve that uses the relative displacement between the nozzle and the baffle to change the size of the liquid flow path opening to achieve control. These valves are mainly used for servo control and proportional control elements.

According to the national standard GB T 17446-1998 "Fluid Transmission System and Components Terminology", hydraulic valves are as follows:

1.Directional control valves --- valves that communicate or control the direction of fluid flow, including spool valves, poppet valves, etc.

2.Check valves --- valves that only allow the flow of fluid in one direction, including spring return check valves, hydraulically controlled check valves, shuttle valves, automatic shut-off valves, quick exhaust valves, etc.

3.Pressure control valves --- valves whose basic function is to regulate pressure, including relief valves, sequential valves, pressure reducing valves, etc.

4.Flow control valves--- valves whose main function is to control flow, including throttle valves, reduction valves, speed control valves, diverter valves, etc.

5.Globe valves --- two-way valves that allow or stop flow in either direction.

6.Servo valves --- valves that receive analog control signals and output corresponding analog fluids, including hydraulic servo valves, electro-hydraulic servo valves, mechanical and hydraulic servo valves, hydraulic flow servo valves, hydraulic pressure servo valves and.

Four-, three-way, two-way valves, etc.

Hydraulic valves can be divided into pressure control valves, flow control valves, and directional control valves. Or it can be divided into tubular valves and plate valves. Ordinary valves, cartridge valves, proportional valves, servo valves, etc.

Hydraulic valves are key components of the pumping system and directly affect the performance of the pumping system. At present, the commonly used distribution valves are S valves and gate valves, and other forms include skirt valves and C-type valves (elephant nose valves).

S Valve:The S valve is now the most widely used distribution valve, and its biggest advantage is that the gap is automatically supplemented by pressure self-balancing and rubber springs, so that the floating cutting ring has a self-sealing effect and a large delivery pressure. The S valve has an outlet, which is installed in the hopper and connects the conveying cylinder and the conveying pipe.

Gate valves:The feed port is connected with the hopper, the discharge port is connected with the Y-shaped pipe, and the back is connected with the conveying cylinder, and the inlet and outlet of the conveying cylinder are periodically opened and closed through the rapid reciprocating movement of the ram, so as to switch the flow direction of concrete between the conveying cylinder and the hopper and the Y-shaped pipe to realize the repeated pumping of concrete.

Skirt Valve:Because it has the shape of the skirt and gets its name, the feed port is small, the discharge port is large, due to the large diameter, the valve body is short, the inner arc changes slowly, the runner resistance is small, and the hopper has good material absorption, it has the advantages of durability.

Type C Valve:Also known as the elephant trunk valve, it is a riser type distribution valve, which works similarly to the S valve, but the discharge end is arranged vertically, and the pipe valve is C-shaped. It is also placed inside the hopper and connects the outlet to the conveyor cylinder.

Because the valve body occupies the space above the hopper, it is not easy to stir and cause pipe blockage, and it is rarely used in the market.

By driving mode: electric valve manual valve.

By channel: two three links, two five links, three three five links, etc.

According to the function: on-off valve, pressure regulating valve, throttle valve, back pressure valve, relief valve, check valve, etc.

In addition, there are too many like proportional valves, servo valves, slide valves, and so on.

The basic ones are relief valves, reversing valves, speed control valves, sequence valves, and check valves.

1. Relief valves: hydraulic valves in two aspects: pressure control and overflow.

2. Directional valves: whether two-way, three-way, four-way, etc., it is a hydraulic valve that controls the flow direction of liquid.

3. Speed valve: It is a hydraulic valve related to throttling and speed regulation to control speed.

These three types of hydraulic valves can completely control all the functional actions, although there are many kinds of subdivisions, but from the functional point of view, there are generally these three.