Check valves and ball valves are two different types of valves that are significantly different in terms of structure, working principle, use and application. The following is a detailed comparison of the two valves:
First, structural differences
1. Check valve
Check valves usually consist of a body, disc, spring, and gasket.
The disc is the key component of the check valve, which can automatically open or close when the medium flow direction changes.
The structure of the check valve is relatively simple and is designed to prevent the backflow of the medium.
2. Ball Valve
The ball valve consists of a ball, a stem, a valve body and a sealing ring.
The ball is the opening and closing part of the ball valve, which is opened and closed by rotating 90° around the axis of the valve stem.
The ball valve is relatively compact and easy to manufacture and install.
Second, the difference in working principle
1. Check valve
The working principle of the check valve is based on the change in the direction of the flow of the medium. When the medium is flowing forward, the valve disc is pushed open to allow the medium to pass through; When the medium flows in reverse, the valve disc automatically closes under the action of the medium pressure and its own gravity to prevent the medium from flowing back.
2. Ball Valve
The working principle of the ball valve is to control the on-off of the medium by rotating the ball. When the ball is rotated to a position parallel to the pipe opening, the medium can flow through the aperture of the ball; When the ball is rotated to a position perpendicular to the pipe opening, the medium is cut off to achieve a closed state.
Third, the difference between use and application
1. Check valve
Check valves are mainly used to prevent media backflow and protect equipment and systems from damage.
It is suitable for air, water, gas, oil and other media in the pipeline, especially in the pump outlet, container outlet and other need to prevent the media backflow occasions.
The check valve can also be used in the supply line of the auxiliary system to provide supply in the auxiliary system where the pressure may rise above the system pressure.
2. Ball Valve
Ball valves are mainly used to cut off, distribute and change the direction of medium flow.
It is suitable for the control of various industrial pipelines, fire fighting facilities and household gas pipelines.
Ball valve has the characteristics of small flow resistance, fast opening and closing, strong corrosion resistance, etc., so it is widely used in petroleum, chemical industry, urban water supply and drainage, petrochemical, metallurgy, pharmaceutical and other fields.
Fourth, other differences
1. Operation mode
Check valves are automatic valves that do not require manual operation, and their opening and closing are completely dependent on changes in the direction of medium flow.
Ball valves usually need to be manually operated or through electric and pneumatic actuators to control the rotation of the ball, so as to achieve the on-off of the medium.
2. Performance characteristics
The main performance characteristics of the check valve are to prevent media backflow and protect equipment and system safety.
Ball valve has the advantages of small flow resistance, fast opening and closing, strong corrosion resistance, strong pressure bearing capacity, etc., suitable for a variety of industrial fields and civil fields.
In summary, there are significant differences between check valves and ball valves in terms of structure, working principle, use and application. In practical applications, the appropriate valve type should be selected according to the specific needs and working conditions.
Post time: Oct-28-2024