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The difference between cast steel ball valve and forged steel ball valve and its main classification

by:Sino Valves     2021-11-28
Forged steel ball valves and cast steel ball valves are mainly steel forging processes, and the processing forms are different: cast steel is used for pouring castings. A kind of casting alloy. Cast steel is divided into cast carbon steel, cast low alloy steel and cast special steel. Cast steel refers to a type of steel casting produced by casting methods. Cast steel is mainly used to manufacture some parts with complex shapes, difficult to forge or cutting, but require high strength and plasticity. Forged steel ball valves: Forged steel ball valves refer to various forgings and forgings produced by forging methods. . The quality of forged steel ball valves is higher than that of cast steel ball valves, and it can withstand large impact forces. Its plasticity, toughness and other mechanical properties are also higher than those of cast steel. Therefore, forged steel should be used for all important machine parts. Ball valve casting is liquid forming, while forging is a plastic deformation process. Forging shaped workpieces can improve the internal structure of the organization, with good mechanical properties and uniform crystal grains. Important laborious workpieces must be forged. Casting will cause microstructure segregation and microstructure defects. Of course, there are other castings. The advantage is that it is not easy to open the mold for forming complex workpieces, so casting is adopted. The main classification of cast steel ball valves:    1. According to the structural form 1. 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 tightly on the sealing surface of the outlet end to ensure that the outlet end is sealed. .   The floating ball valve has a simple structure and good sealing performance, but the load of the working medium on the sphere 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 sphere medium. This structure is widely used in medium and low pressure ball valves.   2. Fixed ball valve    The ball of the ball valve is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After receiving the pressure of the medium, the valve seat will move, so that the sealing ring is pressed tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, and the operating torque is small, which is 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 lubricants are injected between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operating torque. , It is more suitable for high-pressure and large-caliber ball valves.   3. Elastic ball valve    The ball of the ball valve is elastic. Both the ball and the valve seat sealing ring are 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 valve is suitable for high temperature and high pressure media.   Elastic sphere is to open an elastic groove on the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, use the wedge-shaped head of the valve stem to expand the ball and press the valve seat to seal. Loosen the wedge-shaped head before rotating the ball, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction of the sealing surface and the operating torque.   2. According to the channel position    ball valve can be divided into straight-through type, three-way type and right-angle type according to its channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.  三、Other classification   1. Ball valves are divided into O-type ball valves and V-type ball valves. The O-type ball valve adopts a floating structure, the core is a precision casting, the surface is plated with hard chromium, and the valve seat is made of reinforced PTFE material. Leakage, generally used as on-off valve, especially suitable for high-viscosity, fiber-containing, granular media; V-shaped ball valve adopts a fixed structure, with a V-shaped cut on the ball core, which can achieve proportional adjustment, and the flow characteristics are approximately equal percentages. 2. According to different process equipment, pneumatic or electric can be selected to form pneumatic ball valve and electric ball valve. Pneumatic ball valve must be equipped with valve positioner if it is to realize proportional adjustment. Electric ball valve must be equipped with electronic electric actuator or equipped with proportional adjustment. Servo amplifier, etc.   3. From the material, it can be divided into: carbon steel ball valve, stainless steel 304 ball valve, 316 ball valve and copper ball valve.   4. In terms of application, it can be divided into: high pressure ball valve and low pressure ball valve.   High-pressure ball valve: Mainly used in petroleum, natural gas, hydraulic oil, engineering machinery and other industries.   Low pressure ball valve: Mainly used in non-corrosive pipelines such as water as the medium. This article was edited and published by Valve (Technical Department)
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