in this paper, the high temperature bidirectional fixed ball wear-resistant ball valve in design, material selection and its structure characteristics, analyzes the main components of the design theory and calculation method, product performance to reach the domestic advanced level, in the development and application of machinery industry has the vital significance. Overview 1,

at present, the domestic use of wear-resistant ball valve, generally USES the usual one-way seal, valve seat to reach whole sealing effect. Traditional & other; Loose & throughout; Seat the clearance around the resulting buildup of medium and wear and tear, in use process, because of the dust and other granular material in a sphere or seat adhesion, easy cause when opening and closing valve seat or ball abrasion, seat and ball & other; Lock & throughout; , resulting in seal failure. Sealing material is not resistant to high temperature or sealing surface damage and cause the valve leakage and the dead, so that greatly reduce the service life of the valve, and hard to meet the needs of the valve industry. Two-way wear-resisting high temperature fixed ball ball valve application of new technology, new structure and new technology and new standard, using high temperature resistance, corrosion resistance of high carbon and low sulphur gasket as a two-way sealed foundation, provides the stable sealing pressure ratio. Seat combination of unique design, with good sealing effect and the grinding performance and scraping function. Principle 2,

high temperature two-way wear-resisting fixed ball ball valve of the main components, the right body, left the body, ball, valve stem, combination seat, combination packing, manual device components. in the action to be switch, figure 1 manual device 7 handle only need to rotate clockwise 90 & deg; Ball valve for closing motion; Counterclockwise, open action sphere. When the handle when the direction of axis parallel to the direction of the axis of the ball valve, ball valve in the fully open position. When the handle is vertical axis direction and the direction of the axis of the ball valve, ball valve in the closed state.

3, design technology solutions ( 1) High temperature two plate fixed ball two-way wear-resisting ball valve is fixed through ball valve, in the design of main parts parts material is: body adopts the WCB, CF8, CF8M, 17 - stem is made of Ph, 304, 316, 4 ball material F304 + WC, F316 + WC. The design of the valve leakage in accordance with GB/T13927 D.

( 2) Ball valve opening and closing action in use process, due to the medium of scour, erosion and accumulation, causes of sealing face of the different degree of wear and tear, lead to valve leakage is serious, then USES the combination form of seat structure, as shown in figure 2, the gasket adopts the unique design of the inverted triangle, metal sealing valve seat seal and bearing ring with high polymer material triangle is, thus fundamentally eliminating the medium into the seat at the bottom of the condensation, the seat seal between the body and the possibility of the radial leakage. Also USES the high polymer material between the ring and the base of the triangle ring to support each other and sealing ring, completely solve the particulate medium into spring hole lead to cylindrical spring cannot scale defects and under high temperature and medium or particles sphere and valve seat & other; Lock & throughout; Problem, ensure the normal order of the springs in the seat seal, the seal pressure always maintain in a reasonable scope, implement the working condition of high temperature state of the Industrial Valves performance reliability of long-term operation.

( 3) Filler combination separation are, the triangle structure design, as shown in figure 3. Seal set and isolation ring dividing the two sets of packing, packing for the regular triangle, and packing 2. The triangle. After repeated practice, when the medium pressure push for ball valves in the valve stem and valve stem drive, qi movement, triangular packing one, two transfer, effectively remove the attachment in the stem of graphite powder surface corrosion phenomenon, in this way, the service life of the stem and packing increased 2 ~ 3 times, gland leakage rate is zero.

4, technological requirements

( 1) Ensure sphere with benign seating, main components directly from the valve CWK800 horizontal machining center. installed on the combination seat in radial tolerance level D10, light degree requirements 1. 6 cooperate with them.

( 2) Sphere - Seat sealing pair ( As shown in figure 4) The supersonic spraying tungsten carbide ( HRC≥ 70). Process and the company patent grinding process, in combination with scraping type sealing structure, wide surface sphere and must match with the valve seat grinding, make them form a continuous seal belt, so as to realize zero leakage, the purpose of the sticky dirty resistance, resistance to erosion, prolong the service life of the valve.

6, conclusion

by design calculations and the actual application, the high temperature bidirectional fixed ball wear-resistant ball valve can completely satisfy the use requirement of working condition, has been widely used in petroleum, chemical industry, light industry, building, metallurgy, oil, water, corrosive fluid engineering and aluminum alumina powder transportation engineering, has a broad development potential.

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