To withstand high temperature, must use hard seal, but large leakage; zero leakage, must use soft seal, but not high temperature. In order to overcome the contradiction between double eccentric butterfly valve and butterfly valve, it has made third eccentricities. The structure is characterized by the eccentric position of the double eccentric valve stem axis, while the conical axis of the seal surface of the butterfly plate inclines to the axis of the cylinder, that is to say, after third eccentricity, the seal section of the butterfly plate is no longer true, but an ellipse, and its dense cover is asymmetrical in the body and the side is tilted in the body. The heart line and the other side are parallel to the center line of the body.

triple eccentric disc valve has been experiencing self perfection and continuous development since it was published. Even the most basic zero leakage and theoretical triple eccentric disc valves can be achieved, but in fact it still depends on careful design and precision manufacturing.

1, Life long triple eccentric metal seal butterfly valve is a metal to metal sealing valve, no tetrafluoroethylene, rubber or other non metal materials in the sealing surface, so that the valve can ensure that the valve is wear-resistant, long time work does not deform, and will not cause valve leakage due to the deformation of the valve seat. triple eccentric metal seal butterfly valve in the valve opening and closing process, the valve plate and valve seat are disconnected, there is no friction between them. Therefore, the triple eccentric metal seal butterfly valve has a very long service life, is not easy to leak, the consumption of spare parts is low, and the maintenance cost is low. 

2, Good regulation performance, triple eccentric butterfly valve has certain regulating performance, often used as regulating valve. 

3, The size of small weight and light weight triple eccentric metal seal butterfly valve and the same caliber and the pressure grade of other valves, its size is much smaller, the weight is much lighter, so the price is cheaper, and the valve is easy to arrange, the pipeline support is simple. 

4, The cutting performance is good. triple eccentric metal seal butterfly valve uses torque to cut off the valve, so the valve seat has excellent sealing performance, so some people call it zero leakage valve. The solid particles or dirt in the medium have no obvious effect on the cutting performance of the triple eccentric metal seal butterfly valve. As the valve closes close, the velocity of the medium is very high so that the dirt can not accumulate at the seat of the valve. 

5. The scope of application is wide

API specification

As we all know, API609 has actually become an international standard for valves used in industrial important pipelines. Tritec is designed and manufactured in strict accordance with the latest 1997 edition of API609 specifications. More valuable is, the basic design of Tritec is not limited to the API one specification, BS5155ANSIB16.34, ASMESECVIII and other large specifications can correspond, which ensures that Tritec is in use in all industrial fields.

Double security structure

Tritec strictly according to the specifications of the API609, in order to prevent the deformation of the butterfly plate, the valve stem dislocation, the sealing face bite, and the two separate thrust rings on the upper and lower side of the butterfly plate to ensure the valve's regular work under any working condition.

At the same time, in order to prevent the failure of the stem caused by the unknown cause, the sudden accident caused by flying out, and two separate valve stem flying out prevention mechanisms inside and outside the end of the valve are designed, which also ensures that the pressure level of Tritec can be as high as 2500 lbs. from the side.

Dead zone design

In the process of design, Tritec especially considered the application problem in the control field, fully utilized the sealing principle of triple eccentric butterfly valves, made the butterfly plate non scraping seat, the torque of the valve stem passed through the butterfly plate directly to the cover when the valve switch was switched, that is to say, almost no friction between the butterfly plate and the seat, thus eliminating the phenomenon of friction between the butterfly plate and the seat. It is a common jumping phenomenon to open the common valve, to eliminate the regulation inability caused by various unstable factors such as friction in the low open range of the valve, that is, the root except the dead zone (not the band), which means that the Tritec can almost start from the 0 degree of opening to enter the adjustable area, until the 90 open degree, and its normal control ratio. It is more than 2 times of the general butterfly valve, and the regulation ratio can reach up to 100:1. This creates good conditions for the use of Tritec as a control valve, especially in large aperture, the cost of the cut-off valve is very high, and the cut-off valve can not achieve zero leakage. In the case of urgent shutoff, the shutoff valve must be installed on the side of the cut-off valve, and the Tritec set is regulated and closed in one, and its economic benefit is extreme. It's considerable.

Body seat structure

triple eccentric butterfly valve seat installation structure has two kinds, most of which are installed on the butterfly plate for the convenience of the diagram, but the Tritec adopts the body seat structure and the seat is installed on the body. The advantage is that compared with the butterfly plate seat, it greatly reduces the opportunity for the seat to contact the medium directly, thus reducing the erosion of the seat and prolonging the service life of the seat.

Thin slice seat structure

Tritec's seat is made up of stainless steel sheet and graphite sheet. This structure can effectively prevent the impact of small solids in the medium and the sealing surface that may be caused by thermal expansion, even minor damage, and no leakage, which is not the case for double eccentric butterfly valves or other triple eccentric butterfly valves. Imaginable.

Replaceable seal pair

The seal pair of Tritec is unique, not only the valve seat can be replaced, but also because the butterfly plate seal face and the butterfly plate are independent, the butterfly plate seal can also be replaced, that is to say, when the butterfly plate sealing surface is damaged, it is not necessary to send the butterfly plate back to the manufacturing plant or to break the valve in a large scale, and only need to change the seal face of the butterfly plate. This not only greatly reduces the maintenance cost, but also greatly reduces the maintenance time and maintenance strength and difficulty.

Equilibrium fixed structure

From the features of the seal face of triple eccentric butterfly valves, the sealing pair of Tritec is fixed with a bolt oval distribution, not only accurate, but also the balance of each bolt, and the loosening and leakage of the seal pair caused by uneven distribution of stress.