Flange butterfly valve is the introduction of the United States HATMAN self-sealing valve design company design philosophy, self-developed successfully developed, in which the valve flap and valve shaft connected with the U.S. Patent and sales structure designed to pull back. The main features of this valve is sealed reliable, bi-directional sealing, and the connection close, not loose, so that the valve using the long-term. Its characteristics are as follows:
1, two-way seal
Usually the traditional butterfly, because of its structural reasons, in the opposite direction (the direction is not conducive to sealing) working pressure, not well sealed, the relevant state standards are not mandatory two-way sealed, but the valve can be designed ensure that PN operating conditions to achieve bi-directional sealing effect. This is due to:
1. Using self-sealing design concept
Flap valve seals rubber embedded directly to the serrated valve flap, without the use of pressure ring or a bolt is fixed, thus avoiding the traditional bolt-type seal platen seals Shouli Bu result of both, so that bolts loss, and premature failure of seals . Ring in the opposite direction under the effect of working pressure, resulting in a self-sealing edge, so that sealing specific pressure increased, the valve seat ring pressed, the greater the pressure in the opposite direction, then the self-sealing force is also larger, so that with the valve seat ring are linked closely together to achieve bi-directional sealing effect.
2. Valve flap rigidity is good, not easily deformed
The butterfly valve DN300 flap over dual-plate truss flow-through structure, flow resistance is small, rigidity is good, working pressure in the opposite direction, not easy to deformation, so that does not ring with the valve seat valve deformation from the best seal-point, thus ensuring the seal of the sealing effect.
3. Rubber O-ring and long life
⑴ As a result of the design concept of self-sealing, rubber rings and stainless steel valve seat of interference between the relatively small amount is to maintain the initial seal, it seals the needs of specific pressure along with the system pressure increases.
⑵ In addition, serrated leaves within a groove for the rubber elasticity of the so-called concessions to "breathe" slot, so that when the rubber under pressure in a certain stretch of space, so that long-term fatigue on the Bu Zhiyu produce flexible, so seal significant increase in life expectancy than traditional patterns.
Second, the patent sales structure designed to pull back
Usually butterfly valve in the use of the process, due to the traditional pin connected to pin from the valve shaft through the heart of not only reduces the strength of the valve shaft, but also in the process of long-term use and the resulting gap between the valve shaft, which, when the switch valve an impact load, the load is far greater than under normal circumstances, compression stress and shear stress generated by the load, often occurs in the course of marketing a serious deformation or fracture, so that the valve closure of lax or ineffective, and greatly reduces valve life. Production of valves, using the U.S. design patent pull back the structure to replace the pin axis and the pin connection between the flap valve structure, sales do not pull back through the valve shaft of the center, not only will not weaken the strength of the shaft, but also with the valve shaft of the Laminated surface greatly increased, by tightening pull back pin nut, so that pulling back pin and valve shaft preload that arise between joint surface, so that valve flap valve shaft tightly together without gaps, in the opening and closing the valve without will be an impact load, so that a smooth rotation flap valve, so as to achieve a reliable seal.
Third, the unique design of the bottom of the axial adjustment of locking device
In the DN300 butterfly valves in the above specifications, taking into account the reliability of sealing butterfly plate weight, in the manufacture of precision through the axial position of adjustment and fixed, so that valve flap in the seat in the best position on the state seal. In the long-term use that may arise in the course of the valve flap to sag, further adjustments can be easily locked up long-term use of zero leakage.
4, seal replacement easy
When the seals need to be replaced when the valve flap need not removed, simply fully open the valve and then remove the key devices operation will be transferred to shut down after the operation device and the main valve remains key connection, and then turn towards the direction of continues to turn the handwheel until the O-ring seals in the valve body can replace the face side of ring.
To achieve the above-mentioned advantages of the unique needs of sophisticated process to ensure that it takes a higher cost, but the valve to ensure the quality of customer satisfaction, enhance the technical level of similar butterfly valves, our products continue to insist on the use of advanced technology, exquisite craft to create, and strive to pass with a soft seal butterfly valve products can reach international advanced level.
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