Three eccentric metal sealing flange butterfly valve D343W

Three eccentric flange butterfly valve D343W

Stem axis deviation from the center of the disc and the center of the body, and the seal of the three pairs of oblique butterfly valve.

Three eccentric butterfly valve, is widely used in medium temperature less than 425 DEG C, petroleum chemical industry, metallurgy, electric power and water supply and drainage and municipal construction and other industrial pipelines, adjust the flux and set off fluid. Material is divided into: cast iron, cast steel, stainless steel, its main features are:

API specification

As we all know, API609 has in fact become an international standard for industrial pipeline valves. The Tritec is fully in strict accordance with the latest version of the API609 specification 1997 design, manufacture. More importantly, the basic design of Tritec is not limited to the API specification, a BS5155 ANSI B 16.34 ASME, SEC VIII and other major specifications can be ensured, the corresponding Tritec are useless in all industrial areas.

Double safety structure

Tritec in strict accordance with the API609 specifications, in order to prevent the disc caused by the influence of fluid pressure, temperature deformation, dislocation, occlusion, stem sealing surface on the lower side of the butterfly plate are respectively arranged on two separate thrust ring, thereby ensuring the valve in any condition of the normal work;

At the same time, in order to prevent unknown cause stem breakage, fly out caused by the accident, in the end two at the design of the valve and separate the stem fly preventing mechanism, this is also from the side to ensure that the Tritec pressure level can be up to 2500 pounds.

Dead zone design

Tritec in the design process, especially considering the regulation in the field of application, make full use of the three eccentric butterfly valve sealing principle, do not scratch the switch valve disc valve seat, valve stem torque through the butterfly plate directly transferred to the sealing surface, that is to say the butterfly plate and the valve seat almost without friction phenomenon, thus the valve is open to ordinary common jumping phenomenon, eradication of the valve opened range internal friction of various factors of instability caused by the phenomenon, in addition to the root can not dead (not sense band). This means that Tritec can almost 0 from the opening of the regulatory region, until the 90 opening the normal regulation ratio is more than 2 times, the general valve regulation than the maximum can reach up to 100:1. This is Tritec as a control valve used to create good conditions, especially in large diameter, high cost, in addition the cut-off valve, cut-off valve to achieve zero leakage, in need of emergency shutdown conditions, must turn off the valve, and Tritec set control and shutdown in one, with its economic benefits in the side of the cut-off valve is very considerable.

Body seat structure

Three eccentric butterfly valve seat structure has two kinds, most of which is convenient for the installation of the butterfly plate, but the Tritec is the body seat structure, the valve seat installed in the body. The utility model has the advantages that compared with the valve seat of the butterfly plate, the utility model can greatly reduce the chance that the valve seat is directly contacted with the medium, thereby reducing the degree of erosion of the valve seat and prolonging the service life of the valve seat.

Thin sheet valve seat structure

Tritec seat by stainless steel sheets and graphene sheets are stacked, the structure can effectively prevent the effects of medium small solids and thermal expansion may cause the sealing surface, even tiny occlusal damage, does not cause leakage, which in the double eccentric butterfly valve or other three eccentric butterfly valve is can not imagine.

Replaceable seal pair

Tritec has become an independent school, not only the body sealing seat can be replaced, and because the disc sealing surface and the butterfly plate is independent of the sealing surface of the butterfly plate, you can change, that is to say when the disc sealing surface is damaged, will not be shipped back to the factory or large scaled decomposition valves, just swap the butterfly plate seal can face, which not only reduces the maintenance cost, but also greatly reduced the maintenance and overhaul of strength and difficulty.

Balanced fixed structure

Starting from the sealing surface, the shape characteristics of three eccentric butterfly valve seal pair Tritec fixed by bolt fixed, not only elliptic distribution of accurate positioning, but also makes each bolt balance stress, eliminate the stress caused by uneven distribution of loose sealing and leakage.