Floating ball and fixed ball difference: Floating Ball: a sphere without the support shaft, the ball was holding two seats of which was "floating" status, it is mainly used to cut off the pipeline, distribution and change the direction of media flow. Fixed ball: a sphere is fixed, no movement after compression, ball valves are fixed with a floating valve seat, by the medium pressure, the valve seat to move, the seal ring pressed the ball, in order to ensure the seal, usually in the and on the ball, the lower shaft with bearings, low torque operation, suitable for high pressure and large diameter valves. Ball Valve Features:? High temperature: As hard dense ball valve selection of alloy steel, alloy steel spray valve, gasket is steel welding, recent temperature resistant to 600 degrees. ? Wearable: seal valve spool is spray steel, alloy steel ring is surfacing, will not have much wear and tear on the switch. (Its hardness factor of 65-70) good sealing performance:? The use of artificial grinding until the spool and seal completely consistent to use. ? Switch Light: bottom seal with seal and valve spring to cling together, so when outside forces played in spring preload switch very light, long life?. Soft Seal Ball Features:? Fluid resistance, full bore ball basically no flow resistance. ? Simple structure, small size and light weight. ? Tight seal reliable, there are two sealing surface, plastic seal, can be completely sealed, the vacuum system is also widely used. ? Easy to operate, seals are generally activities, to facilitate the demolition? In the fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. ? In the opening and closing process has observed swab, and so was available with suspended solids medium. Eccentric half ball Features:? Sphere circular straight channel, the flow channel length, resistance, can have flow properties and good performance linear regulator, and the impurity is not deposited in the valve chamber. ? Valve seat and valve settings stepped inside and outside the mating structure to prevent jamming or other phenomena occur with the ball out of the seat. ? Rotation radius of all the different points on the spherical sealing eccentric spherical curve in the forward curve, etc., when closed, the sealing surface to put the seat back into the more closed more tightly to form an adequate seal than the pressure to write more stable and reliable sealing performance. ? Designed with spring preload movable metal seat, spring and pressure ring combined with the valve in the course of the sealing surface wear, the spring action, the valve continues to ensure good sealing performance. ? Safe and reliable operation, medium scale or with particles may affect the valve open only for a moment, to increase the safety factor of the design of the valve stem and actuator torque, a safety factor of between 1.5 and 2.5. ? Top-loading design, the system pressure relief, without removing the entire valve direct inspection and maintenance. Eccentric eccentric half ball and half ball difference coat type: 1: use of eccentric eccentric half ball valve eccentric ball and seat, when the valve stem for rotation in common trajectory automatic centering, the closing process more closed more tightly, fully meet Good sealing purposes. Gui Long valve ball and seat completely out, eliminating the wear ring to overcome the traditional ball valve seat and the sealing surface of the ball is always the problem of wear and tear, non-metallic elastic material is embedded in the metal seat and seat metal surfaces are well protection. This product is especially suitable for steel, aluminum, fiber, tiny solid particles, pulp, coal ash, petroleum gas and other media. Eccentric half ball selection method [Source: from the network] [Author: admin] [Date: 11-09-28] [Hits: 18] eccentric half ball selection principle applies: 1, transmission mains oil, natural gas, it is necessary cleaning the pipeline, buried in the ground and the need, use full bore, all-welded ball valve structure; buried in the ground, select the ball full bore welded or flanged connections; manifolds, use flanged, welded connections, all pass through or reduced diameter ball. 2, pipelines and storage facilities refined oil, use ball valve flange connection. 3, city gas and natural gas pipelines, the choice of a floating ball valve flange and threaded connections. 4, metallurgical oxygen piping system, should use rigorous degreased, fixed ball valve flange connection. 5, the pipeline system and cryogenic medium, should use combined with low temperature valve bonnet. 6, the pipeline system FCCU refining units, the choice of lift rod ball. Equipment and piping systems 7, pH and other chemical systems in corrosive media, should use austenitic stainless steel, Teflon for all stainless steel ball valve seat ring. 8, metallurgy systems, piping systems or devices on power systems, petrochemical plants, urban heating systems in high-temperature media, the choice of metal to metal seal valve. 9, the need for flow regulation, the choice of the worm gear, pneumatic or electric with regulating valve V-shaped opening.