Forged steel ball valves and cast steel ball valve is mainly steel forging process, form different processing: cast steel to steel pouring castings. One of the casting alloy. Cast steel can be divided into cast carbon steel, cast low alloy steel and special steel casting 3 classes. Cast steel is to point to the casting method and produce a kind of steel castings. Cast steel is mainly used in the manufacture of some complicated shape, difficult to forging or machining deformation and the strength of the high demand and the plastic parts of forged steel valves, forged steel ball valve refers to the forging method and produce all kinds of forging and forging. Forged steel ball quality is higher than cast steel ball valve parts, able to withstand the impact of the big role, plasticity, toughness, and other aspects of the mechanical properties were also higher than steel, so that some important machine parts should be used is a liquid forging steel ball valve casting molding, and forging is plastic deformation process, the forging forming workpiece can improve the organization structure, mechanical performance is good, uniform grain, important demanding workpiece must be forged, casting can cause tissue segregation, tissue defects, casting has his advantage, of course, forging forming complex workpiece is not easy to open mold, so take the casting. Cast steel ball valve of the main categories: one, according to the structure of the form 1. Floating ball ball valve ball valve ball is floating, under the effect of medium pressure, the fitness ball produce certain displacement and compression at the outlet seal surface, guarantee the outlet seal. Floating ball ball valve has simple structure, good sealing, but all spheres of work under medium load to export seal, therefore should consider to seal material can withstand sphere medium working load. In this structure, it is widely used in low pressure ball valve. 2. Fixed ball ball valve ball valve ball is fixed, does not produce mobile after compression. Fixed ball valves have a floating ball valve seat, the medium pressure, mobile seat, make the seal compression on the ball, to ensure the seal. Usually mounted on the upper and lower shaft with ball bearing, the operating torque is small, suitable for high pressure and large diameter of the valve. To reduce the number of ball valve operating torque and increase the reliability of the sealing, appeared in recent years, oil seal ball Industrial Valves, both betting special lubricant between the sealing surface, in order to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure large diameter ball valve. 3. Elastic ball ball Industrial Valves ball valve ball is elastic. Ball and seat sealing adopts metal materials, sealing pressure is very big, relying on the pressure of the medium itself already could not reach the requirements of sealing, must exert external forces. This valve is suitable for high temperature and high pressure medium. Elastic ball is on the lower end of the sphere wall open one elastic slot, and elasticity. When close the channel, sphere rolling out with stem wedge-shaped head pressure to seal with the valve seat. Wedge head before you turn the sphere are released, the sphere then restore the original prototype, appear very small gap between the sphere and valve seat, can reduce the sealing surface friction and operating torque. Second, according to the channel position ball valve according to its location can be divided into straight-through, three general formula and right Angle type. Two kinds of ball valves for distribution after the medium and change the flow of medium. Third, other category 1. Ball valve and ball valve has a O V type ball Industrial Valves. O-type ball valve structure of floating type, ball core for precision casting, hard chromium plating processing, appearance with enhanced ptfe seat material, flow crossing the same as the pipe diameter, flow capacity, little flow resistance, closing without leakage, generally do switch valve is used, especially suitable for high viscosity, fiber, granular media; V-shaped ball valve USES the fixed structure, the ball on a v-shaped incision, which can realize proportional control, flow characteristic is approximate equal percentage. 2. Process equipment under different choice of pneumatic or electric, forming an and electric ball valves, pneumatic ball valve such as pneumatic ball valve must be regulated to achieve proportional valve positioner, such as the electric ball valve to be regulated to achieve proportional election electronic actuators or servo amplifier, etc. 3. From the material, can be divided into: carbon steel ball valve, 304 stainless steel ball valve, 316 copper ball valve and ball valve. 4. With applications, can be divided into: high pressure ball valve and low pressure ball valve. High pressure ball valve: mainly used in oil, gas, hydraulic oil, engineering machinery and other industries. Low pressure ball valve: mainly used in medium for water and other corrosive pipelines.
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