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The working principle of the ball valve The ball valve relies on rotating the valve stem to unblock or block the valve. 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.
Ball valve body material: cast steel, stainless steel, forged steel, chromium-molybdenum steel, brass.
Sealing surface material.
Working pressure
Working temperature.
Valve size.
Connection method: flange to clamp welding internal thread clamp sleeve.
Transmission mode: manual worm gear, pneumatic and electric.
Applicable medium: water, oil, gas, steam, acid.
Manufacturing standards are national standards, American standards and Japanese standards.
Ball valves and plug valves are the same type of valves. The difference is that the closing member is a ball. The ball rotates around the center line of the valve body to open and close the valve. Ball valves are mainly used in pipelines to cut off distribution and change the flow direction of media. The ball valve is a new type of valve that has been widely used in recent years. It has the following advantages: small body resistance, and its resistance coefficient is equal to that of a pipe section of the same length.
Simple structure, small size and light weight.
Tight and reliable, plastic is currently widely used as the sealing surface material of ball valves with good sealing properties, and has also been widely used in vacuum systems.
Easy to operate, open and close quickly, just rotate from fully open to fully closed, convenient for long-distance control.
Easy to repair, the ball valve has a simple structure, the sealing ring is generally movable, and it is easy to disassemble and replace.
When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes, it will not cause erosion of the valve sealing surface.
It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be applied from high vacuum to high pressure.
Ball valves can be divided according to their structural forms
A floating ball ball valve The ball of the ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press against the sealing surface of the outlet end to ensure that the outlet end seal. 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.
2. Fixed ball ball valve The ball of the ball valve is fixed and does not move after being pressurized. 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 in recent years. Special lubricating oil is injected between the sealing surfaces to form an oil film, which enhances the sealing and reduces the operating torque. , more suitable for high-pressure and large-diameter ball valves.
Three elastic ball valves 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.
The following matters should be paid attention to when installing and maintaining ball valves
Leave a position for the valve handle to rotate.
Cannot be used for throttling.
The ball valve of the transmission mechanism should be installed upright.
Ball valves have been widely used in various petrochemical, liquefied gas, water supply and drainage, food, pharmaceuticals, power generation, papermaking, urban construction, mineral boilers, steam systems, municipal aviation and other fields, as well as in residents' daily lives.
Ball valve series products: imported ball valves, German imported ball valves, British imported ball valves, Japanese imported ball valves, American imported ball valves, floating ball valves, fixed ball valves, fireproof ball valves, anti-static ball valves, manual ball valves, pneumatic ball valves, electric ball valves, worm gear transmission ball valves. Metal hard seal ball valve high temperature ball valve//. High pressure ball valve/small high pressure ball valve series butt welding high pressure ball valve high temperature and high pressure ball valve. Insulated ball valve. Liquefied balloon valve and natural gas ball valve. Three-way ball valve type three-way ball valve four-way ball valve. Eccentric semi-ball valve/. Fluorine lined ball valve. Plastic ball valve. Drainage ball valve. Long distance pipeline ball valve, pulverized coal injection ball valve, ash discharge ball valve. Sulfur resistant ball valve. type ball valve. Italian ultra-thin ball valve wafer type ball valve. Vacuum ball valve, internal thread ball valve, two-piece ball valve, three-piece ball valve, spring ball valve, track ball valve, double ball valve, scale-adjustable ball valve, bevel ball valve, top-mounted eccentric ball valve, side-mounted eccentric ball valve. Stainless steel ball valve, carbon steel ball valve, forged steel ball valve, brass ball valve, aluminum alloy ball valve, tank truck ball valve and other series of products.