Year1
- 阀体材质：
- 不锈钢、碳钢、铸铁
- 连接方式：
- 法兰、焊接、螺纹
- 使用介质：
- 液体
Product details
Imported two-piece ball valve
Product overview of imported two-piece ball valve
Two-piece ball valve is a relatively new type of ball valve, which has its own unique structure Some of the characteristics of the switch are that it has no friction, the seal is not easy to wear, and the opening and closing torque is small. This allows the size of the actuator to be used reduced. Equipped with a multi-turn electric actuator, the medium can be adjusted and tightly cut off. It is widely used in petrochemical, urban water supply and drainage and other working conditions that require strict cutting.
Working principle of imported two-piece ball valve
This valve relies on the rotation of the valve core to make the valve unobstructed or blocked. Ball valves are light on and off, small in size, can be made into large diameters, have reliable sealing, simple structure, and easy maintenance. The sealing surface and spherical surface are always in a closed state and are not easily eroded by the medium. They are widely used in various industries.
Opening process
Closing process
During the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball, pressing it tightly against the valve seat to achieve a complete seal. .
Structural form of imported two-piece ball valve
Floating ball valve
The ball of the ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and be pressed tightly against the sealing surface of the outlet end. , ensure the outlet end is sealed. The floating ball valve has a simple structure and good sealing performance, but all the load of the working medium on the ball is transferred to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.
Fixed ball ball valve
The ball of the ball valve is fixed and does not move when pressed. Fixed ball and ball valves all have floating valve seats. After being subjected to medium pressure, the valve seat moves, causing the sealing ring to press tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque, and are suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared recently. Special lubricating oil is injected between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the The operating torque is more suitable for high-pressure and large-diameter ball valves.
Elastic ball ball valve
The ball of the ball valve is elastic. The ball and valve seat sealing ring are both made of metal materials, and the sealing specific pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This kind of valve is suitable for high temperature and high pressure media. The elastic sphere obtains elasticity by opening an elastic groove at the lower end of the inner wall of the sphere. When closing the channel, use the wedge-shaped head of the valve stem to expand the ball and compress the valve seat to achieve a seal. Loosen the wedge-shaped head before turning the ball, and the ball will return to its original shape, leaving a small gap between the ball and the valve seat, which can reduce friction on the sealing surface and operating torque.
Ball valves can be divided into straight-through type, three-way type and right-angle type according to their channel position. The latter two ball valves are used to distribute media and change the flow direction of media. When installing and maintaining ball valves, attention should be paid to the following matters: leaving a position for the valve handle to rotate. Can be used as a throttling device. Ball valves with transmission mechanisms should be installed upright.
Imported two-piece ball valve parts and materials
Serial number
Part name
Material
Stainless steel
Carbon steel
Valve body
/> Stainless steel
Carbon steel
Sphere
Stainless steel
Stainless steel
Sealing ring
PTFE
PTFE
Gasket
PTFE
PTFE
Valve cover
Stainless steel
Carbon Steel
Stem
Stainless steel
Stainless steel
Thrust washer
PTFE
PTFE
Packing
PTFE
PTFE
Packing gland nut
Stainless steel
Stainless steel
< br/> Handle
Stainless steel
Stainless steel
Washer
Stainless steel
Stainless steel
Stem nut
Stainless steel< br/> Stainless steel
Handle cover
Plastic
Plastic
Main dimensions of imported two-piece ball valve
Weight
WhatsApp
