Eccentric hemisphere valve technology update after use
A, the structure using eccentric -- chocking principle.
Rotary valve body and valve core center (
The valve stem axis)
And sealing in the valve core of spherical geometry center offset a radial size, also with the valve seat sealing surface in the valve body is a channel axis offset size, seal under external force for the metal contact, self-locking valve door relies on two eccentric close, the reasonable choice of eccentric locking 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 core of the hemisphere valve technology, from the structure principle, through the manufacturing methods to achieve the best sealing, ball valve, butterfly valve door door, gate valve, globe valve and so on is inferior.
Second, 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 valve seat, valve core in the process of contact with the valve seat, has a strong ability to remove fouling.
And gate valve sealing surface of the door opening and closing of frequent reciprocating motion, the mixed flow medium scale deposition in the lower part of the valve body cavity, the cut-off valve is completely dependent on positive pressure sealing, the valve seat of scaling without cleaning ability, the packing often repeated wear cause inside leaking outside the gate valve gate, globe valve leakage.
Ball valve door seal is rely on long-term extrusion on the spherical valve seat, it must wear the hemisphere valve fast, butterfly valve door seal is rubber for mediation, it a hemisphere, ball valve, gate valve, gate valve gate metal hard seal performance.
After long-term use of hemisphere of the valve, the valve seat can have traces of wear, it will continue to be used, by adjusting the valve stem and packing in the process of opening and closing the valve rod just rotate it 90 & deg;
, when there were signs of leakage, pressure packing gland bolts touch again, packing can be realized without leakage, while the other valve door is still a small leak reluctantly, big leaks in the valve gate.
Three, operation is extremely light.
Eccentric hemisphere valve opening and closing of the entire process, sealing pair in the undamped idling state, almost all the external force is only in the opening and closing moments from or compression, and the valve rod just rotate it 90 & deg;
Light and fast, convenient operation, of course.
Ball valves in the process of opening and closing door is on both ends of the holding force of the valve seat and operate, it is the hemisphere valve opening and closing torque, nominal diameter larger open-close torque, the more obvious difference, the butterfly valve door opening and closing is to overcome the deformation of the rubber, torque is bigger.
The gate valve gate, globe valve operating time is long and difficult.
Fourth, long service life.
Sealing pair belongs to bimetal, different USES of surfacing alloy on the mother, after special heat treatment, its mechanical performance and 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 gate valve seat just below the valve core hardness, 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, door opening and closing of the valve without failure, tens of thousands of times longer service life.
5, wide application range.
Widely used in non-ferrous smelting, the pulverized coal injection of gas natural gas, iron and steel slag and dust removal, electric power, harmful gases,
Hydrogen sulfide, phosgene, etc. )
And oil (
Heavy fuel oil, crude oil, residual oil, etc. )
Smelting and transmission.
It has wide scope of application, mainly because of sealing pair of different surfacing alloy respectively, make it a double metal, valve body, valve stem and other main parts adopt the needed materials, to satisfy different working conditions, a Shanghai engineering valve door a variety of products.
Six, the hemisphere valve technology updated alternative of an eccentric valve door, gate valve, butterfly valve door USES.