Overview

1.

as industrial development, the ball valve, in particular, the growing demand of high temperature and high pressure condition of ball valve, ball valve with wear-resisting, scouring resistance, high temperature resistant and corrosion resistant performance is higher. And traditional though full size ball valve and its seat after welding, spraying technology for surface hardening treatment, but its service life, cost and performance still cannot satisfy the use requirement, such as industrial silicon, coal chemical, blast furnace gas, gas and other harsh working conditions. Double eccentric ball Industrial Valves is learned the different structure of ball valve and V valves and track ball valve and advantages to develop new products. Ball Industrial Valves with double eccentric sealing structure, wear small, small torque, good sealing performance, long service life. Seat and half sphere with special hardening process, especially to adapt to the harsh working conditions is resistant to wear and tear, scouring resistance, corrosion resistance, high temperature resistant requirements.

2, structure features

2. 1 and a half sphere

double eccentric ball valves and ball with double eccentric design, reliable sealing effect, instantaneous release, torque is small, long service life. Can be used in the harsh conditions of transport granule medium. Its structure principle is half sphere center line and stem centerline offset size a, and the seat centerline offset size b, sphere and valve seat completely off when fully open, and there is a certain gap, radius of gyration is divided into long radius and short radius, in long radius turn the trajectory of the tangent and the valve seat sealing surface to form a & theta; Relative Angle, when the valve opening and closing, hemisphere seating faces a fading out from in the opening 10 & deg; When the core is fully separated from and enter the effect of extrusion, which reduces the opening and closing the seat between the hemispheres and mechanical wear and scratches, improve the service life.

2。 2, seat

( 1) Seat is floating design, reduces the processing difficulty, guarantee the seat centerline and half sphere center of sphere overlap, thus improve the sealing performance. Seat and body have clearance d, using half a sphere position during assembly can automatically find the midline, ensure the Industrial Valves seat sealing surface contact with half sphere spherical, solve the machining accuracy due to the error caused by the leakage and improves the using performance and life of ball valve.

( 2) The seat and the seal between the valve body adopts hard seal structure, suitable for high temperature and high pressure conditions. Seat and body sealing interface dimension c value is small, each sealing surface accuracy requirement is high, when assembling, retainer with electric impact wrench installation, mesh is not only a retainer with the valve body, prevent loose, and it is the seat of friction rotation, in line with the mechanical vibration meshing principle, reliable sealing seat and body.

( 3) Seat and body and seat with half sphere with two hard seal, so the valve can be used in high temperature and high pressure conditions.

2。 3, other parts

overall valve adopts modular design, simple structure, good reliability, high universality. Stem adopts the overflowing structure. Drive way diversification, the valve stem, bracket and connection of the actuator size with ISO5211 standard, can be directly with various specifications actuators piece together. Commonly used driving mode has manual, pneumatic, hydraulic, electric and gas liquid linkage, thus improve the performance of double eccentric half ball valve use.

3, using range

double eccentric half with valve ball valve is suitable for all kinds of common industry demands, such as water, sewage, waste water, steam, gas, pulp and other medium. If the seal the Cr - Mn- Si carbide and fireproof, explosion protection and anti-static function, is suitable for high temperature medium in requirements, such as gas, coke oven gas, water gas and natural gas, etc. If the seal ( A half sphere, seat) And body flow through tungsten carbide special craft processing, has high efficiency and energy saving, good abrasion resistance, reliable sealing performance, convenient operation, opening and closing fast, long life and other advantages, is the industrial silicon industry choice of pipe runs with the valve. Because of its half sphere and valve seat in an instant from and instantaneous pressure characteristics, suitable for medium containing particles of harsh working conditions, can be widely used in metallurgy, mineral processing, the power of pulverized coal in the production process, such as the coal pulverizing system and the cleaning of all kinds of line control. In the process of instant detachment and instantaneous pressure, cut half sphere and valve seat have to squeeze effect can remove scale and adhesive on the surface of the seal, can ensure reliable sealing tightness. Precipitation is conveying easy scaling, the precipitation crystallization solution slurry and slurry ash two-phase mixture fluid medium in the process with the ideal choice.

4, epilogue

at present, the double eccentric half ball valves of various specifications of products have been applied in various projects in different industries, the effect is good, and gradually expand the scope of use.

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