Double eccentric hemisphere ball valve to replace the feasibility of the gate and globe valves

ball valve is of the fastest developing speed in recent years in China valve type, in addition to the hard seal ball valve, double eccentric hemisphere ball valve also got rapid development. Double eccentric hemisphere ball valve is in serious weigh the ball valve, butterfly valve, gate valve and other valve advantages and disadvantages of the premise of the introduction of Germany and a half ball valve products and development of the localization of products, a conclusion pointed out: & hellip; In some respects on the using performance of more is better than that of gate Industrial Valves, globe valve and ball valve and other products, can be applied in petroleum, chemical, electric power and metallurgy industries & hellip; , double eccentric hemisphere ball valve design is unique, novel structure, order scope expands unceasingly, does on different occasions instead of ball valve, butterfly valve, gate valve and other valve, ball valve structure of double eccentric hemisphere advantages specific have:

a, hemisphere in the light of the chocking eccentric ball valve structure principle.

rotary valve body and valve core center ( The stem axis) And sealing of the spherical valve core geometry center offset a radial size, also with the valve seat sealing surface channel axis of the valve body has a bias size, sealing pair under external force for the metal to metal contact, achievement by two eccentric valve self-locking closed, the reasonable choice of eccentric makes latching Angle is less than the friction Angle, Angle of self-locking chosen too small to shut down easy, open, difficult point selected, while the open force is small, but close the torque increases rapidly, the test-bed of trial and error, determine the two reasonable collocation of eccentricity is essential, reliable self-locking performance to ensure the sealing tightness. This is the half of an eccentric valve core technology, from the structure principle, through the manufacturing methods to achieve the best sealing, ball valve, butterfly valve, gate valve, globe valve and so on is inferior.

2 and a half ball valve easy to implement and maintain zero leakage for a long time.

the valve core and valve seat sealing is spherical line contact, by eccentric realize self-locking, seal the opening and closing the whole process of little contact, only at the instant of the opening and closing, will contact and brake tight zero leakage, ensure no leakage point of dynamic and static seal. Scaling or other debris on the seat, the valve core in the process of contact with the seat, has a strong ability to remove fouling. And gate valve sealing surface in the opening and closing of the frequent reciprocating motion, mixed flow medium scale deposition in the lower part of the body cavity, the cut-off valve depend entirely on positive pressure seal, scaling on the seat without cleaning ability, the packing often repeated wear cause inside leaking outside the gate valve, globe valve leakage. seal is to rely on the seat extrusion on the sphere for a long time, it is half a ball valve must wear fast, butterfly valve seal is rubber for mediation, it is half a ball valve, ball valve, gate valve, metal hard seal performance. After half a ball valve use for a long time, the seat trace wear, also can produce it may continue to use by adjusting, stem and packing in the process of opening and closing the valve stem just rotate it 90 & deg; , when there were signs of leakage, pressure packing gland bolts touch again, packing can be realized without leakage, and the other is still the small leak valve force, big leaks in the valve.

3, double side of an eccentric valve operation is extremely light.

the whole process of double eccentric hemisphere ball valve opening and closing, sealing pair in the undamped idling state, almost all the external force is only in the opening and closing moments from or pressure, and valve stem just rotate it 90 & deg; Light and fast, convenient operation, of course. Ball valve is in the process of opening and closing on both ends of the valve seat hold force under operation, it is half a ball valve opening and closing torque, the greater the nominal diameter of open-close torque, the more obvious difference, the butterfly valve opening and closing is to overcome the deformation of the rubber, torque is bigger. The gate valve, globe valve operating time is long and arduous.

four and a half, double eccentric ball valve long service life.

seal belongs to bimetal, different USES of surfacing alloy on the mother, after special heat treatment on the mechanical properties of the seal and the physical and chemical indexes reach the best state, to satisfy different working conditions, Strong wear, wash quickly, severe corrosion medium etc. ) The need, the valve seat hardness is slightly lower than the valve core, different material and different heat treatment process, need to seal the deputy of hardness can reach more than HRC53, also can be 560 ℃ high temperature resistant. Practice has proved that its ability to resist corrosion and anti-seizure six times that of stainless steel seal, valve opening and closing of thousands of times without failure, prolong the service life.

five, double eccentric hemisphere ball valve application range.

side half of an eccentric valve series varieties are widely used in non-ferrous smelting, the pulverized coal injection of gas natural gas, iron and steel slag and dust removal, electric power, coal pulverizing coal conveying system, harmful gases, Hydrogen sulfide, phosgene, etc. ) And oil ( Heavy fuel oil, crude oil, residual oil, etc. ) Smelting and transmission. Half ball valve has wide scope of application, mainly because the seal can be different alloy welding, make it a double metal, valve body, valve stem and other main parts adopt the required materials, to meet the needs of different working conditions.

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