What is a shut off valve? What are the main applications?

The shut-off valve is a kind of actuator in the automation system, which is composed of a multi-spring pneumatic membrane actuator or a floating piston actuator and a regulating valve, which receives the signal of the regulating instrument and controls the cut-off, connection or switching of the fluid in the process pipeline. It has the characteristics of simple structure, sensitive response and reliable action. It can be widely used in petroleum, chemical, metallurgical and other industrial production sectors.

The air source of the pneumatic shut-off valve requires filtered compressed air, and the medium flowing through the valve body should be liquids and gases free of impurities and particles. According to the allowable differential pressure, the characteristics of the medium and the requirements of the process pipeline, single-seat, sleeve and three-way shut-off valves can be selected.

The shut-off valve is mainly used in the following occasions:

1. Connect with the combustible gas leakage monitoring instrument, when the instrument detects the combustible gas leakage, automatically and quickly close the main gas supply valve, cut off the gas supply, and stop the occurrence of vicious accidents in time.

2. It is connected with the ultimate temperature and pressure safety controller of the thermal equipment, and when the temperature and pressure of the detection point in the equipment exceeds the set limit value, the gas supply valve will be automatically and quickly closed to stop the fuel supply.

3. Connect with the fire alarm system of high-rise buildings, and automatically cut off the gas in the building when a fire occurs in the building to prevent the occurrence of gas.

4. ZCR gas emergency shut-off valve is set in the gas pipeline network of the city or factory, which can be centrally controlled in the control room and remotely shut down the pipeline gas supply at the accident site.

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 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.

Answer] :d The test point involved in this question is the role of the ball valve. Ball valves are mainly used for quick shut-off of pipelines.

Answer: Dear! Have you found out what is the difference between a shut-off valve and a shut-off valve?

Both shut-off and shut-off valves are valves used to control fluids, but they differ in the way they control fluids and their application scenarios. The shut-off valve is a kind of valve used to control the fluid type filial piety, and its main function is to cut off the channel of the fluid, so that the fluid cannot pass through. Shut-off valves are typically used where tight control of fluid flow is required, such as cutting off the flow of fluid in an emergency, or closing the fluid channel to avoid fluid leakage when service or maintenance is required.

The shut-off valve is a valve used to control the fluid, and its main function is to cut off the channel of the fluid, so that the fluid cannot pass through. Shut-off valves are typically used where frequent fluid flow needs to be controlled, such as opening or closing the fluid passage to achieve the desired flow rate or pressure when the fluid needs to be regulated or controlled. Therefore, the difference between a shut-off valve and a shut-off valve is the way in which the fluid is controlled and the application scenario.

The shut-off valve is mainly used to cut off the fluid passage or overhaul or maintain the fluid in an emergency, while the shut-off valve is mainly used to control the flow of the fluid frequently, such as regulating or controlling the fluid. Kiss! I hope my answer helps!

Hello, a shut-off valve refers to a valve that can control the flow of media, and its function is to regulate or close the flow of mediated arubber essentia. The shut-off valve refers to a valve that can completely cut off the flow of the medium, and its function is to cut off or isolate the medium in the sail state at the necessary time. Therefore, the functions of shut-off valves and shut-off valves are different and their uses are different.

Hello, shut-off valve and shut-off valve are both valves used to control pipeline fluid, but their roles are different, the difference is as follows: shut-off valve is used to control the fluid in the pipeline, which can quickly open or close the pipeline, and play the role of cutting off fluid transmission in the fluid pipeline. Shut-off valves are usually operated by stool rotating valves or poppet discs, which can completely shut down the pipe for a short period of time, or can control the flow rate of the fluid through pressure differentials.

Similar to shut-off valves, shut-off valves are used to stop the flow of fluid in pipelines, but shut-off valves are particularly suitable for blocking operations in hazardous or high buried rough selling pressure conditions. Shut-off valves typically use semi-circular spherical valve bends or steel cut-off doors that can be hung or slid in the pipe like a gate to close the pipe. The shut-off valve has a very strong sealing performance and is able to withstand high pressures.

In a nutshell, shut-off valves are typically used for general pipeline control, while shut-off valves are used for special and hazardous pipeline control.

The globe valve is a common pipe connection device in many of our industrial facilities, which controls the speed of the fluid in our pipeline, so that it can be well isolated from the outside world, creating a very closed environment for it. The media used in different production is different, which requires us to correspond to different types of globe valves, of course, the characteristics of these products are also different. This article will give you a brief introduction!

What are the types of globe valves?

1. Water-sealed globe valve.

The main working medium of the water-sealed globe valve is water, steam, oil and non-corrosive gas, which is used as an opening and closing device, especially suitable for the vacuum condensation system of steam turbine in thermal power plants, and has two forms: globe valve and gate valve. It is suitable for nominal pressure 10MPa and operating temperature 400 or 550 °C. The bonnet packing chamber has a water-circulating sealing structure when water is introduced into the interface.

It can isolate the system from the atmosphere and ensure that the system has good air tightness. When used for opening and closing on the pipeline, it must be in a fully open or fully closed state, and shall not be used to regulate the flow rate.

2. Antibiotic shut-off valve.

Antibiotic shut-off valve is a special type of shut-off valve, which has a strong sterilization and detoxification function to prevent product infection. It is mainly used in biological fermentation, medical and beer fermentation, amino acid fermentation, biological agricultural fermentation, biological fertilizer fermentation, various antibiotic fermentation, biological, biochemical, chemical materials, water, steam, cold control and other fields.

3. Throttle stop valve former.

The design and manufacturing standard of throttle globe valve is a type of valve in accordance with GB T12235. It is suitable for opening and closing and adjusting the flow rate on pipelines under various working conditions such as petroleum, chemical, manufacturing, fertilizer, and power industries with nominal pressure of PN16 PN40 and working temperature of -20 350. Double ram two-way elastic sealing, flexible opening and closing, fast sealing, reliable sealing; The stem of the vacuum partition globe valve is connected with the cabinet disc by dynamic connection, and the valve disc and the valve seat are vertically seated; Small opening and closing stroke and valve height.

The characteristics of the gate valve: the sealing performance is better than that of the globe valve, the fluid resistance is small, the opening and closing is more labor-saving, the sealing surface is less eroded by the medium when fully opened, and is not limited by the flow direction of the medium, with double flow direction, the structure length is small, and the application range is wide. The overall size is high, a certain space is required for opening, the opening and closing time is long, the sealing surface is easy to erode and abrasion when opening and closing, and the two sealing pairs bring difficulties to processing and maintenance.

The characteristics of butterfly valves: simple structure, small size, light weight, consumables saving, especially suitable for manufacturing large-diameter valves. The opening and closing are fast, and the flow resistance is small.

It can be used for media with suspended solids and, depending on the strength of the sealing surface, for powdery and granular media. It can be applied to the two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways in metallurgy, light industry, electric power, petroleum and petrochemical systems, etc. The flow adjustment range is not large, when the opening reaches 30%, the flow rate is nearly 95% or more.

It should not be used in high-pressure piping systems. Generally, the working temperature is below 300 meters, and the pressure is below the pressure. The large high-temperature butterfly valve is made of steel plate welding, which is mainly used for flue air ducts and gas pipelines of high-temperature medium.

The characteristics of the globe valve: simple structure, high tightness, convenient manufacturing and maintenance, large water resistance, and can adjust the flow rate; "Low in and high out" is directional during installation; It is mainly used in hot water** and high-pressure steam pipelines, and is not suitable for media with particles and large viscosity.

The function of the shut-off valve:

1. The main function of the globe valve in the pipeline is to cut off or connect the fluid, and the regulating flow rate of the globe valve is better than that of the gate valve, but the globe valve cannot be used to adjust the pressure and flow rate for a long time, otherwise, the sealing surface of the globe valve may be washed and corroded by the medium, and the sealing performance of the megafiber will be broken.

2. The globe valve can be used for water, Wangchailu steam, constriction air trapping and other pipelines, but it is not suitable for medium pipelines with high viscosity, easy coking and easy precipitation, so as not to damage the sealing surface.

Truncation shed check valve is the only liquid rule: a kind of forced sealing valve buried.