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      precision flow control valve  Based on usage analysis, the sealing between the ball and va lve seat, a seal between the metal and metal, the sphere and the valve seat material is usually carbon steel, stainless steel, Division stellite, etc., but this class of materials stopcock in prone: (1) ball and seat abrasion too fast or plastic deformation cause Mifengbuyan, liquid leak [1,3-5], â'µ ball and seat under high pressure due to adhesive wear and cold welding "effect caused" killed ", the valve can not open [2]. In accordance with the design requirements of the valve [6], the material of the sphere with the valve seat of the square bar stopcock must have a good corrosion resistance, wear resistance and a sufficient strength and toughness. In view of this, we believe that the ball and seat materials should have as high hardness and stiffness, strength and toughness with excellent corrosion resistance and meet at the same time. Accordingly, we believe that the TiC alloy material may be an ideal choice. Because, a main component of (Ti, W) C-Ni + Co + Cr TiC alloy having excellent wear resistance and corrosion resistance, while having a much higher modulus of elasticity than steel and a higher chemical stability , can effectively prevent the adhesive wear and cold welding "effect, Ti element also has a self-lubricating effect, can reduce the surface friction coefficient, reducing the resistance of the plug valve in the closed and open process, convenient operation. hydraulic adapter fittings