IEVS BALL VALVE FEATURES
1. Advanced Ball and Seat Hardening Technology
The ball and seat of the metal seated ball valve absolutely adopts the sealing mode of metal to metal. According to different conditions and requirements of users, various advanced ball and seat hardening technologies can be adopted, including HVOF coating, nickel-based hard alloy spray welding etc. Generally, the ball and seat surface can reach HRC55-60 with the maximum value of HRC70.
2. Flexible Valve Opening and Closing
Under the service condition of high temperature, the ball and seat will expand too much because of thermal expansion, and thus causing that valve cannot be opened. The ball valve adopts the disc spring or spring loaded sealing structure so that thermal expansion of parts under high temperature can be absorbed by the disc spring or spring, and it is ensured that the valve will be flexibly opened and closed under high temperature without expanding too much under high temperature.
3. Fireproof Structure Design
In the metal to metal sealing structure for the valve, the gasket is the stainless steel + flexible graphite. Therefore, reliable sealing of the valve can be ensured, even in the case of fire.
4. Double Block and Bleed (Metal Seated Trunnion Ball Valve)
The metal seated trunnion ball valve usually adopts the sealing structure before the ball. When the valve is closed and the middle cavity is emptied through the discharge valve, the upstream and downstream seats will independently block the fluid at the inlet and outlet to realise double block function. The metal seated floating ball valve usually adopts the sealing structure after the ball. Unidirectional Sealing is generally adopted with flow direction marked on the body. If users have special requirements, bi-directional sealing structure can be adopted
5. Reliable Sealing Performance
The unique ball grinding technology is adopted. Through rotation of the ball and grinder at different positions, the ball surface will achieve high roundness and fineness. The low pressure sealing of valve seat is realised by spring pre-tightening. In addition, the piston effect of valve seat is designed reasonably, which realises high pressure sealing buy the pressure of the medium itself. The sealing level of the valve meets the requirement of level IV ANSI B16.104
COMMON BALL VALVE TYPOLOGY
The ball and seat ring packings are easily replaced after removing a cover without dismantling the valve from the pipe line. Adjustment of seat portion can be made after assembly either on the ball or the ring packing. Sealing characteristic is favorable and maintenance is convenient.
Metal Coating Type
The employment of corrosion-resistant materials, such as titanium and stainless, to the valves with large diameter and thickness or for high pressure applications will cost a lot of The metal coating type is so designed to economize the material costs by the employment of inner fluid-contacting portion lined with corrosion-resistant materials, while maintaining strength with cast or forged steel on the outside
In general the residuals in wide opening between the ball and body wall bring about deterioration or malfunction in the forms of quality change, crystallization and solidification. Pocket-less type guarantees the quality offluids by minimizing the residuals.