The structural characteristics of the vacuum globe valve, the working principle of the vacuum valve

1. There is no friction in opening and closing. This function completely solves the problem of traditional valves affecting the seal due to the friction between the sealing surfaces.

3. Single seat design. It eliminates the problem that the medium in the cavity of the valve affects the safety of use due to abnormal pressure increase.

4. Low torque design. The valve stem with special structure design can be easily opened and closed with only a small handle valve.

5. Wedge-shaped sealing structure. The valve is sealed by the mechanical force provided by the valve stem to press the ball wedge to the valve seat, so that the sealing of the valve is not affected by the change of pipeline pressure, and the sealing performance is reliably guaranteed under various working conditions.

6. Self-cleaning structure of sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline passes evenly along the sealing surface of the ball at 360°, which not only eliminates the local scouring of the valve seat by the high-speed fluid, but also washes away the accumulation on the sealing surface to achieve the purpose of self-cleaning.

7. The main body of this series of valves adopts cast-forging structure, with parallel double sealing and semi-forced two-way sealing, and the sealing surface is in place and the wedge-shaped block wedge movement is staged step by step to achieve zero leakage.

8. The friction force of the sealing surface is small, the opening and closing is light, and the sealing surface has the function of automatic compensation for the wear.

9. Simple structure, compact, easy maintenance and long service life.

10. The packing chamber of the bonnet is equipped with a vacuum sealing structure, which has the effect of self-expansion and compression, and the seal is sealed with high-strength expansion material, so that the system is completely isolated from the atmosphere, and has good system airtightness.

11. The connection form of this series of valves is divided into flange and welding, and the driving mode is manual and electric.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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 vacuum pump compresses the air in the pump chamber and then discharges it out of the pump to generate negative pressure in the pump chamber. Under the pressure of atmospheric pressure, the outside air enters the pump chamber under negative pressure and is compressed and discharged. And so on, pumping the air out of a container is the principle.

In fact, it refers to the vacuum system elements used to change the direction of the air flow, adjust the air flow rate, and cut off or connect the pipeline in the vacuum system. Vacuum valve closures are sealed with seals like glue or metal.

Two common forms of connection.

Looper flange connection.

This is the most widely used form of connection in valves. According to the shape of the joint surface, it can be divided into the following types:

1) Smooth type: used for valves with low pressure. It is more convenient to process.

2) Concave and convex type: the working pressure is high, and the medium hard washer can be used.

3) Tongue and groove type: gasket with large plastic deformation can be used, which is widely used in corrosive media and has a good sealing effect.

4) Trapezoidal trough type: use an oval metal ring as a washer, which is used for valves with a working pressure of 64 kg square centimeters, or high-temperature valves.

5) Lens type: The gasket is a lens shape and is made of metal. For high-pressure valves with a working pressure of 100 kg cm², or high-temperature valves.

6) O-ring type: This is a relatively new form of flange connection, which was developed with the emergence of various rubber O-rings, and it is more reliable than the general flat gasket in terms of sealing effect.

Threaded connection. This is an easy connection method and is often used for small valves. There are two more cases:

1) Direct sealing: the internal and external threads directly play a sealing role. In order to ensure that the connection does not leak, it is often filled with lead oil, thread hemp and PTFE raw tape; Among them, PTFE raw material belt is widely used; This material has good corrosion resistance, excellent sealing effect, easy to use and preserve, and when disassembled, it can be removed intact, because it is a non-sticky film, which is much superior to lead oil and thread hemp.

2) Indirect sealing: The force of thread tightening is transmitted to the gasket between the two planes, so that the gasket can play a sealing role.

Quick release flange connection.

Clamps are used to clamp the sealing O-ring with the body flange to achieve a better seal.

Vacuum valves are collectively referred to, and the specific vacuum valve principles vary;

The pneumatic high vacuum baffle valve is powered by compressed air, changing the direction of the air path through the electromagnetic reversing valve, pushing the cylinder piston up and down, driving the valve stem to move up and down, so that the valve plate is opened or closed, so as to achieve the purpose of connecting or cutting off the air flow in the vacuum system

The solenoid vacuum with inflation valve is a special valve installed on a mechanical vacuum pump. The valve and the pump are connected to the same power supply, and the opening and closing of the pump directly control the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the pump chamber through the air inlet of the pump, so as to avoid the backflow of pump oil and pollute the vacuum system.

Vacuum (pressure) ball valves are suitable for the flow of media in a vacuum system to make or break off a pipeline. The valve is a straight-through manual ball valve with a spherical seal, so it can be used in both vacuum and low pressure conditions, and can be installed in any position. The applicable working medium is acidic or alkaline gas or liquid.

The high vacuum butterfly valve is used to connect or cut off the air flow in the vacuum pipeline, and the valve plate of the valve adopts a clamping structure to clamp the sealing ring of the valve plate to play a better sealing role. The applicable working medium is air and non-corrosive gas.

The principle of different vacuum valves is different.

The ridge anti-vacuum valve is a control valve installed in the vacuum system, which is also called a vacuum breaking valve. The principle is: it is generally operated by an electromagnet to control it to turn on and off or turn on the system medium according to the set rate. Unlike safety valves, vacuum-proof valves are required by process design.

The function is: to break the vacuum state of the system, to achieve shutdown or partial shutdown, convenient maintenance or system switching. Depending on the process requirements, the vacuum breaker can be either a hand valve or an automatic control valve. The aim is to open the medium that introduces the required requirements into the system and increases the absolute pressure of the system.

Summary. Its role is to control the flow of gases in a vacuum system.

Its role is to control the flow of gases in a vacuum system.

Fellow, I really didn't understand, I can be more specific.

A low-vacuum mechanical valve is a valve device commonly used in vacuum systems, and its function is to control the flow of gases in vacuum systems. Specifically, a low-vacuum mechanical valve is usually composed of a valve body, bonnet, stem, disc, etc., and controls the gas by rotating the stem to control the opening and closing of the disc. In vacuum systems, low-vacuum machine collapse valves can be used to control the inflow and exit of gases, or to control the connection and isolation of gases between different areas.

At the same time, the low-vacuum mechanical Bycha valve can also play a role in facilitating disassembly, replacement and maintenance during system maintenance and repair.

Vacuum valve refers to the vacuum system element used to change the direction of air flow, adjust the size of air flow, and cut off or connect the pipeline in the vacuum system. Vacuum valve closures are sealed with rubber seals or metal seals.

1.Switch gas circuit, when valve 1 and valve 4 are closed, and valve 2 is opened, mechanical vacuum pump vacuums container I, and air flow flows through pre-vacuum pumping pipeline; When the valve 2 is closed and the valve 4 is opened, the mechanical pump can vacuum the diffusion pump alone; When the valve 1 and the valve 4 are opened at the same time, the diffusion pump and the mechanical pump can work at the same time to evacuate the container, and the air flow flows through the diffusion pump at this time. It can be seen that the role of the valve in this operation is to open and close the gas path and change the flow route of the air flow.

2.In Figure 1, the opening angle of the valve cover of the regulating valve 1 can adjust the size of the air flow through the pipeline; Close valve 2 and valve 4, can give the inlet of mechanical pump into atmosphere by air release valve 3; The vacuum level in the container can be adjusted by the air release valve 5.

3.Quantitative inflation, there is a small hole of a certain volume on the plunger of the glass valve, when the small hole is turned to the right and communicates with the high-pressure gas cylinder, the small hole can be filled with high-pressure gas; When it turns to the left to communicate with the vacuum vessel, the volume of high-pressure gas is put into the vessel, which plays the role of quantitative inflation.

There are many types of vacuum valves, which are usually classified according to the function, structural form, drive mode, material and use of the valve.

UsesSolenoid vacuum with inflation valve and electromagnetic vacuum differential pressure valve is a vacuum valve specially designed to prevent oil return from the mechanical vacuum pump, which is installed at the air inlet of the mechanical vacuum pump and opens and closes synchronously with the pump. Generally, it cannot be used elsewhere, that is, it cannot be used in a vacuum system for degassing. The advantage of choosing NIV electromagnetic vacuum differential pressure valve is that the power consumption is very small, which saves energy; The body of the DN 50 is made of aluminium, which is lightweight, small in size and fast in disc closing.

Baffle valves are used in vacuum pipes where the angle pass and tee are located. The driving mode is hand, pneumatic, electromagnetic, and electric at the user's discretion. Among them, the GDC-J electromagnetic high vacuum baffle valve is a metal bellows seal, which has a wide range of applications and can also be used as an inflatable valve; The installation position can be arbitrary, and the pressure can be reversed to one atmosphere, and there is a feedback signal output.

Plug-in valves are used in applications where high vacuum level is required or pipe size is required. Fully conducted, valve leakage rate, two-way sealing. The drive mode is hand, pneumatic and electric, which is determined by the user. Both pneumatic and electric are equipped with signal feedback devices.

Diaphragm valves and ball valves are straight-through and can be used in situations where positive pressure and vacuum coexist. The drive mode is hand, pneumatic and electric, which is determined by the user.

The butterfly valve is a straight-through form, and the three driving modes of hand, pneumatic and electric are determined by the user. The opening angle of the manual butterfly valve can be adjusted arbitrarily; The intelligent pneumatic and electric butterfly valves also have an arbitrary opening angle.

Conditions of use of valves:

1.The medium is pure air or non-corrosive gas.

2.The temperature of the medium is determined by the extreme temperature at which the rubber is used.

A vacuum check valve is a valve that automatically stops the backflow of fluid. The disc of the check valve opens under fluid pressure and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes under the action of factors such as fluid pressure difference and its own gravity to prevent the fluid from backflowing.

According to the structure, the vacuum check valve can be divided into three types: lifting check valve, swing check valve and butterfly check valve. Lifting check valves can be divided into vertical and horizontal types. There are three types of swing check valves: single-petal, double-petal and multi-petal.

The butterfly check valve is a straight-through type, and the above check valves can be divided into three types: threaded connection, flange connection and welding.

When the check valve is in use, the inlet pressure pushes the valve plate open, and after the inlet loses pressure or the pressure is less than the outlet pressure, the outlet fluid flows backwards, and the valve plate is pressed back to the closed state, and the vacuum check valve principle is the same.

The shut-off disc and seat sealing surface are overlay iron-based alloy or Stellite cobalt-based cemented carbide, which has the characteristics of wear resistance, high temperature resistance, corrosion resistance, good scratch resistance and long service life. The shut-off check multi-purpose valve (multi-function check valve) product can be applied to the horizontal installation pipeline of various working conditions such as petroleum, chemical, pharmaceutical, and power industries.