Author:Site Editor Publish Time: 2019-01-04 Origin:Site
The triple offset butterfly valve has a slanting circular shape (the third eccentricity of the so-called triple eccentricity) except that the wide rod and the valve plate have two eccentricities.
l Triple offset butterfly valve specification
l The characteristics and the advantages of triple offset butterfly
The valve plate and the valve seat do not generate friction during the closing process, and the boring plate is directly pressed on the valve seat, thus ensuring the service life of the valve; The sealing ring (whether mounted on the valve seat or on the valve plate) has a certain elasticity, and a small amount of clearance between the boss and the elastic ring in the elastic ring causes the elastic ring to slightly shift; when the valve is closed, the effect of closing force. The elastomer sealing ring can be automatically moved to the most uniform position of the force; coupled with a small amount of deformation of the elastic ring, the sealing ring at the valve seat is evenly stressed to achieve the best sealing state.
As the number of eccentricities of the butterfly valve changes. Seat sealing performance has also changed, and the triple offset butterfly valve has excellent seat sealing performance. As the number of eccentricities increases, the torque required to open and close the valve is reduced, so the torque required to open and close triple offset butterfly valves is much smaller than that of other types of butterfly valves. With the change of the number of eccentricities, the temperature range of the butterfly valve and the applicable temperature range will also have a large change. The range of applicable temperature and pressure level of the triple offset butterfly valve is unmatched by other types of butterfly valves.
l The characteristics of the triple offset full metal butterfly valve are as follows:
1. The double flow direction can be pressurized, and the installation method without flow restriction is realized.
2. Full metal seal design, valve seat, seal ring using Stellite alloy surfacing technology, solve the problem of poor sealing performance of butterfly valve under severe working conditions such as high temperature, high pressure and low temperature; can withstand pressure up to 2500 pounds, resistant The temperature is as low as -196 ° C up to 850 ° C, the seal reaches zero leakage, and the control ratio is as high as 100:1 or more.
3. The valve seat and the valve body adopt the split design, and the valve plate and the sealing ring adopt the split design, and the product can realize the universal interchange. The entire valve will not be scrapped due to seal wear problems. It is only necessary to replace the seat and seal to use normally, thus reducing the cost of use.
The characteristic of the three-offset all-metal butterfly valve is that the sealing structure is fundamentally changed, and it is no longer a position seal but a torsion seal. That is, it does not rely on the elastic deformation of the valve seat, but relies on the contact surface pressure of the valve seat to achieve the sealing effect, thus solving the problem of zero leakage of the butterfly valve metal valve seat in one fell swoop. In the sealing angle design, the medium pressure can be partially applied to the sealing surface during the positive and negative flow directions of the medium, and the contact surface pressure plus the partial medium pressure acting on the sealing surface can also solve the high pressure and high temperature.
l Triple offset butterfly valve advantages:
1) Good sealing performance and improved system reliability;
2) The frictional resistance is small, and the opening and closing is labor-saving and flexible;
3) Long service life, which can realize repeated switching;
4) Strong pressure bearing and high temperature resistance, wide application range.
The triple offset sealing structure improves the technical performance and performance of the butterfly valve. The processing technology of the disc offset paraboloid is more complicated than the spherical sealing surface, but due to the reduction of the stem strength and the requirements of the actuator, the on-line self-repairability and its ability to adapt to complex working conditions make the triple offset full metal butterfly valve Machine costs and operating costs have fallen, and overall economic benefits have increased.
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