What is the difference between the throttle shut off valve and the throttle shut off vent valve?

The globe valve is only suitable for full opening and full joint flow valves, and the shape and structure of the valve are no different from the globe valve, except that the shape of their opening and closing parts is different. Most of the opening and closing parts of the throttle valve are conical streamlined, and the flow rate and pressure can be adjusted by changing the cross-sectional area of the channel. The throttle valve is used to reduce the pressure of the medium in the case of a large pressure drop.

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.

Abstract:Venting applications are one of the most important applications in combined-cycle power plants. These valves must discharge the main steam of the waste heat boiler into the atmosphere, bypassing the turbine, at the beginning of operation to ensure that the unit temperature does not rise too quickly.

This is done because the process line is already heated up before allowing steam to pour through the turbine bypass valve into the condenser. The following is a detailed introduction to the role of the vent valve and the relevant knowledge of the throttle cut-off vent valve. What is the function of a vent valve, what is a throttling shut-off vent valve.

In fact, it is an automatic pressure safety valve, which is installed on the air compressor, when the air tank on the air compressor reaches a certain pressure (such as the safety valve is set to 6kgf cm2), the vent valve will automatically open and release the excess air pressure to keep the pressure of the air tank stable (the pressure is not super high, which ensures safety).

It is the function of the vent valve on the air tank, not on the air compressor. The venting valve is also called anti-surge valve on the air compressor, and the venting valve is manual and automatic in the machine, and its function is to relieve pressure and vent when the outlet valve is not opened when the unit has just started, or to remove part of the pressure when the pressure is too high during the operation of the machine, so as to prevent the machine from surging due to high pressure difference, small flow abrasion, and rent-resistant. The working principle of automatic venting valve and manual venting valve is the same.

Product Use: Throttle shut-off vent valves are widely used as closed-circuit devices in pipelines of oil, natural gas, coal gas, petroleum liquefied gas machine refining, airports, chemical industry, oil and gas storage and transportation, etc.

Product structure features.

1. This valve is a new type of throttling, cut-off and venting products, the valve adopts cage-shaped maze throttling, with multi-stage throttling effect, obvious throttling effect, reliable sealing, convenient operation and maintenance, etc.

2. The valve adopts double seal (hard and soft seal) to make the seal reliable, the cemented carbide cover can be more resistant to air flow erosion and wear, and the double seal can achieve zero leakage under the condition of high-pressure gas medium. The valve has a long service life.

3. The sealing surface of the valve seat is sealed with a taper, which is conducive to the cleaning of the dirt attached to the sealing surface by the valve itself.

4. The valve disc of the valve is provided with a balance hole and a piston seal to ensure stable operation under the condition of full pressure difference between opening and closing, light and flexible opening, and small opening and closing torque.

5. The throttle cut-off vent valve and the double-acting throttle valve have the functions of throttling and shut-off (the seal is zero leakage) at the same time, and the throttling part is separated from the sealing surface to reduce the erosion of the seal by the air flow.

6. The double-acting throttle globe valve also has a multi-stage throttling function, and the throttling pressure difference is large, which can be applied to throttling and shut-off under high pressure.

7. The packing adopts a V-shaped packing structure with self-sealing ability, which does not need to be adjusted, and the opening and closing are extremely light. The stuffing box is equipped with an auxiliary sealing grease injection structure, which makes the sealing performance of the valve packing reliable.

9. The valve is provided with a large sewage hole at the bottom of the valve, which should be opened to clean up the dirt in the valve if necessary.

How do oil, natural gas, coal gas, and petroleum liquid gas mechanization, which are closely related to our lives, realize their own losses? How did he carry out the operations of oil refining, airports, chemicals, oil and gas storage and transportation? All are inseparable from throttling shut-off vent valves.

As a new type of throttling, cut-off and venting products, it adopts the cage-shaped maze army throttling, which has a multi-stage throttling effect, obvious throttling effect, reliable sealing, and very convenient operation and maintenance. Let's take a look at its standards. 

Athletic forms

There is a lifting rod type (the stem is lifted, and the handwheel is not lifted), and there is also a lifting and rotating rod type (the handwheel and the stem are rotated and lifted together, and the nut is located on the valve body).

Body material

Cast iron, cast steel, stainless steel, forged steel, chromium-molybdenum steel, chrome-molybdenum vanadium steel, brass, sealing surface material: H, N, F46, J, Y, W, T, G

Working pressure, working temperature -40°C- 550°C. Valve diameter DN15-DN600.

Performance specifications

Nominal pressure(mpa) Applicable temperature( )29 250 Applicable medium Oil, natural gas, water, etc.

Applicable Standards

The shut-off valve is only suitable for full open and full closing, and is not allowed to be adjusted and throttled. The globe valve is a forced seal valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the disc sock, the resistance that needs to be overcome by the operating force is the friction force of the valve stem and the packing material and the thrust generated by the pressure of the medium, and the force of closing the valve is greater than the force of opening the valve, so the diameter of the valve stem should be larger, otherwise the failure of the top bend of the valve stem will occur.

In recent years, after the emergence of the self-sealing valve, the medium flow direction of the globe valve has been changed from the top of the disc to enter the valve cavity, at this time, under the action of medium pressure, the force of closing the valve is small, and the force of opening the valve is large, and the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter. China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down.

When the globe valve is opened, the opening height of the disc is 25% of the nominal diameter When 30%, the flow rate has reached a large level, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the disc.

Globe valves have the following advantages

1.The structure is simple and easy to maintain.

2.The working stroke is small, and the opening and closing time is short.

3.Good sealing, small friction between sealing surfaces, long life.

At present, the throttling shut-off vent valve has been widely used in various boilers, steam systems and residents' daily life. It is believed that with the development of science and technology and the progress of the times, low-quality, high-quality throttle shut-off vent valves will play a greater role in our lives and bring greater surprises to our lives. We also look forward to the convenience that the throttling cut-off vent valve will bring to our lives in the future.

You can get it for free

Hello, it is a pleasure to serve you, and to give you the following answers: Yes, it can be used in reverse, but there are some questions to be aware of:1

Check the valve first for damage, if there is damage, you need to replace the valve with a new one. 2.Check the tightness of the valve, and if there is an air leak, the sealing ring needs to be replaced.

3.Check the connection of the valve and if there is any looseness, it needs to be reconnected. 4.

Check the valve controller and if there is damage, you need to replace it with a new one. 5.Check the control system of the valve rental door and replace it with a new one if there is any damage.

6.When installing the valve, pay attention to the installation direction of the valve, as well as the installation position of the valve. 7.

After the installation is completed, a test is carried out to ensure the proper operation of the valve. Personal experience: When using the flow cut-off vent valve in reverse, it is necessary to carefully check all parts of the valve to ensure the normal operation of the valve, as well as the installation position and direction of the valve, so as to avoid unnecessary losses.

Shut-off valves. It is not possible to replace the throttle valve on behalf of the large opening.

These are 2 parts with different functions.

The globe valve, also known as the gate valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak.

A throttle valve is a valve that controls the flow of a fluid by changing the cross-section or length of the throttle.

It's not the same kind of valve.

Throttle stop valve is to add a throttling function on the basis of the globe valve, that is, the spool head of the globe valve should be designed with equal hundred, linear and equal flow characteristics, and the valve should also be designed with a scale plate to indicate the stroke opening. The valve has the same adjustment performance as a manual control valve, and the sealing level is higher than that of the control valve, so as to achieve zero leakage of the globe valve.

Throttle shut-off venting valve, it not only requires all the functions of the throttle shut-off valve, but also adds the requirement of "venting", generally the medium with this requirement is gas, gas venting is a very troublesome thing, calculate it to know, the valve outlet flow rate is large, the noise is large. In this way, the valve generally requires a multi-stage pressure reduction and noise reduction structure, and because the pressure difference is relatively large, the valve is generally designed with a soft + hard sealing structure to ensure the reliable sealing performance of the valve and prolong the service life of the valve seat. Therefore, the throttle shut-off vent valve is more troublesome than the throttle shut-off valve.

Double-acting throttle globe valve is generally used in bypass valve, with double seal, can be forward and reverse, throttle cut-off vent valve is one-way seal, both kinds of globe valve have throttling effect. It's just my understanding, I don't know if it can help you.

The former is mainly a cut-off material, and the latter is mainly a regulation.

Not one.

A shut-off valve is a valve in which the shut-off moves along the centerline of the seat. This type of valve is very suitable for regulating the flow rate because the stem opening or closing stroke is relatively short, and because it has a very reliable shut-off function, and because the change of the seat port is proportional to the stroke of the disc. Therefore, this type of valve is ideal for use as a shut-off or regulation as well as throttling.

A throttle valve is a valve that controls the flow of fluid by changing the throttle section or throttle length. If the throttle valve and the check valve are connected in parallel, they can be combined to form a one-way throttle valve. Throttle valve and one-way throttle valve are simple flow control valves, in the hydraulic system of the quantitative pump, the throttle valve and the relief valve can be combined to form three types of throttle speed regulation system, namely the inlet throttle speed regulation system, the return oil throttle speed regulation system and the bypass throttle speed regulation system.

The throttle valve does not have a negative flow feedback function, which cannot compensate for the speed instability caused by load changes, and is generally only used in situations where the load change is not large or the speed stability is not required.

The globe valve is a kind of valve that intercepts the medium, because the valve is open and closed, the throttle valve is a valve that controls the flow of the medium, and the structure is the same as the appearance of the globe valve, that is, the valve structure is different.

It's definitely not the same concept, the two are completely different valves.