Structure and classification of stop valves

The stop valve is a commonly used valve whose main function is to cut off or connect the flow of fluid.Due to its simple structure, convenient operation, and good sealing performance, stop valves are widely used in various fluid pipelines, such as water, steam, oil, natural gas, etc.

1. Structure and classification of stop valves

The stop valve is mainly composed of valve body, valve cover, valve disc and valve stem.According to the opening and closing method of the valve disc, globe valves can be divided into three types: parallel type, plug type and gate valve type.

01.Parallel stop valve

The valve disc and valve seat of the parallel globe valve are parallel, and the fluid passes through the gap between the valve disc and the valve seat.This type of stop valve is suitable for pipes with larger diameters and has better flow performance.

02. Plug type globe valve

The valve disc of the plug globe valve is spherical or conical, and the valve is opened and closed by rotating the valve stem.This type of stop valve is suitable for pipes with smaller diameters and has better sealing performance.

03.Gate valve type globe valve

The valve disc and valve seat of the gate valve type globe valve are in a vertical state, and the valve is opened and closed by lifting the valve stem.This type of stop valve is suitable for high temperature and high pressure fluid pipelines and has good sealing performance and pressure resistance.

2.

The working principle of the stop valve is very simple. It mainly uses the sealing cooperation between the valve disc and the valve seat to cut off or connect the fluid.When the valve is closed, fluid cannot flow out of the pipe; when the valve is open, fluid can flow out of the pipe.

3. Advantages and Disadvantages of Globe Valve

1. advantage

(1) Simple structure: The structure of the stop valve is relatively simple and easy to manufacture and maintain.(2) Easy operation: The operation of the stop valve is relatively simple. It can be opened and closed manually, or operated electrically or pneumatically.(3) Good sealing performance: The sealing performance of the stop valve is relatively good and can effectively prevent fluid leakage.(4) Good flow performance: The parallel stop valve has better flow performance and is suitable for large-diameter pipelines.

2. shortcoming

(1) Large fluid resistance: Since the flow path of the stop valve is relatively tortuous, the fluid resistance is relatively large, especially in small-diameter pipelines.(2) Fast wear: Because the flow channel of the stop valve is relatively narrow and the fluid velocity is fast, it is easy to cause wear of the valve components.(3) Not suitable for fluids with a lot of suspended matter: Since the flow channel of the stop valve is narrow, it is easy for the suspended matter in the fluid to block the flow channel, so it is not suitable for fluids with a lot of suspended matter.

4.Application range of stop valve

Globe valves are widely used in various fluid pipelines, such as water, steam, oil, natural gas, etc.It has a wide range of applications in industry, construction, environmental protection and other fields.At the same time, due to its simple structure, convenient operation, and good sealing performance, it is also widely used in various household fluid equipment, such as water pipes, gas water heaters, etc.

5.Globe valve maintenance and upkeep

In order to ensure the normal operation and service life of the stop valve, regular maintenance and upkeep are required.Specific measures include: regularly checking the sealing performance of the valve and whether the fasteners are loose; regularly cleaning the debris and scale inside the valve; keeping the outside of the valve clean and dry, etc.In short, the stop valve is a commonly used fluid control device with the advantages of simple structure, convenient operation, and good sealing performance.Understanding the structure, classification, working principle, advantages, disadvantages and application range of stop valves will help you better use and maintain this valve.