Views: 1 Author: Site Editor Publish Time: 2016-10-13 Origin: Site
Two type ball valve, is widely used in medium temperature of 425 ℃ or less, metallurgy, electric power, petrochemical industry, water supply and drainage, and municipal construction and other industrial pipelines, used to adjust flow cutoff and body.Material is divided into: cast iron, cast steel, stainless steel, and its main features are:
The second type ball valve API specifications
As is known to all, API609 has in fact become industrial important line with international norms of the valve.Ever a valve is in strict accordance with the overall API609 specifications 1997 version of the design, manufacture.More valuable is a basic design of the valve, not only limited to the API is a specification, BS5155 ANSI B 16.34, ASME SEC VIII specifications can correspond, it ensures that a valve in all industrial sectors have nowhere to go.
Double safety construction
Yong API609 specifications in strict accordance with the requirements of the valve, in order to prevent caused by the influence of fluid pressure, temperature of sphere deformation, dislocation of stem, seal face occlusion, the ball up and down side respectively equipped with two separate thrust ring, thus ensuring the normal operation of the valve under any conditions;At the same time, in order to prevent stem damage caused by unknown reason, the accidents caused by flying out, both inside and outside the valve the bottom two designed independently stem fly out to prevent institutions, it also ensures that ever a valve from the side of the pressure level can be up to 2500 pounds.
Two type ball valve seat structure has two kinds of installation, most is installed on the sphere for convenience, but never a valve seat structure is adopted ontology, install the seat on the ontology.Its advantage is compared with the ball seat, greatly reduce the chance of a seat direct contact with the medium, which reduces the seat by the erosion degree, prolong the service life of the valve seat.