The ball of the ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end.
The floating ball valve has a simple structure and good sealing performance, but the load of the ball subjected to the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the spherical medium, and when subjected to a high-pressure impact The sphere may be offset. This structure is generally used for medium and low-pressure ball valves.
The main features of the ball valve are its compact structure, reliable sealing, simple structure and convenient maintenance. The sealing surface and the spherical surface are often closed, not easily eroded by the medium, easy to operate and maintain, suitable for general work such as water, solvent, acid and natural gas. Medium, but also suitable for medium with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, which are widely used in various industries. The ball valve body may be integral or combined.
Among the various valves, the flow resistance of the ball valve is the smallest. When the full-diameter ball valve is opened, the ball passage, the valve body passage and the connecting pipe are equal in diameter and form a diameter, and the medium can flow almost without loss.
When the ball valve is rotated 90°, it can be fully opened and opened and closed quickly. Compared with gate valves and globe valves of the same specifications, the ball valve is small in size and light in weight, which is convenient for pipeline installation.
Advanced valve seat: The valve seat designed with many years of experience in ball valve manufacturing ensures valve sealing, low friction coefficient, small operating torque, various valve seat materials, and wide adaptability.
The switch is correct: the flat head valve stem, the connection with the handle will not be misplaced, so as to ensure that the switch state indicated by the handle is consistent with the valve.
Locking device: In order to prevent the valve switch from being mishandled, there is a locking hole in the fully open and fully closed position of the valve to ensure that the valve is in the correct position.
Stem anti-flying structure: The valve stem is bottom-loaded to prevent pressure from flying out, and at the same time, it can form metal contact with the valve body after the fire to ensure the valve stem is sealed.
The ball valve uses a ball with a circular through hole as the opening and closing member. Under the valve stem drive, the ball rotates around the center of the valve stem at 0~90 degrees to complete the opening and closing function. It has the characteristics of compact structure and quick rotation. Degree, the valve can be closed, the pipeline medium is cut off; the diameter of the ball passage is the same as the diameter of the pipeline, the flow resistance is small, and the circulation capacity is large; the valve stem is the bottom-loading type, which eliminates the accident of the valve stem penetrating and ensures the safety of use.
Applicable medium: water, gas, oil, natural gas and acid-base corrosive medium.
Applicable temperature: -196～350°C
Drive mode: manual, pneumatic, electric, hydraulic, etc.
Nominal diameter: DN 15-250 1/2"~10
The plug valve is a closing or plunger-shaped rotary valve that opens or closes by rotating the passage port on the plug to the same or separate passage opening on the valve body by 90 degrees. The plug of the plug valve may be cylindrical or conical in shape. In a cylindrical valve plug, the passage is generally rectangular; in a tapered valve plug, the passage is trapezoidal. These shapes make the structure of the plug valve light, but at the same time cause some loss. Plug valves are best suited for use as a shut-off and closing medium as well as for shunting, but can sometimes be used for throttling depending on the nature of the application and the erosion resistance of the sealing surface. It is also commonly used for media with suspended particles due to the wiping action between the sealing surfaces of the plug valve and the complete contact with the flowing medium during full opening. Another important feature of the plug valve is that it is easy to accommodate multi-channel construction so that one valve can achieve two, three, or even four different flow paths. This simplifies the design of the piping system, reduces the amount of valves used, and some of the connecting accessories needed in the equipment.
Plug valves are widely used in oilfield mining, transportation and refining equipment, and are also widely used in petrochemical, chemical, gas, natural gas, liquefied petroleum gas, HVAC industry and general industry.
The main advantages of the plug valve are as follows:
Suitable for frequent operation, quick and easy opening and closing.
The fluid resistance is small.
The utility model has the advantages of simple structure, relatively small volume, light weight and convenient maintenance.
Good sealing performance
The flow direction of the medium can be arbitrary regardless of the installation direction.
No vibration, low noise.