Detachable movable valve seat Y-type stop valve

Abstract

The invention relates to a detachable movable valve seat Y-type stop valve. The detachable movable valve seat Y-type stop valve comprises a valve body (1), an integrated valve element stem (6), a bracket (15) and a hand wheel (20); the valve body (1) is provided with a three-channel structure of a medium inflow channel, a valve body middle cavity and a medium outflow channel; a valve seat sealingpad (2), a valve seat (3), a sleeve (4) and a sleeve pressing cover (5) are arranged in the valve body middle cavity of the valve body (1) in sequence from bottom to top; the sleeve (4) is arranged onthe upper surface of a valve seat base ring; the integrated valve element stem (6) is inserted into the valve body through the sleeve (4); and the sleeve pressing cover (5) is installed above the sleeve (4); the outer circle of the lower end of the valve element stem is matched with the inner wall of the sleeve (4) to form a guide, and the upper end of the valve element stem penetrates through astuffing box hole formed in the sleeve pressing cover. A stuffing liner (7), a combined stuffing (9), a stuffing pressing cover (10) are arranged in the stuffing box hole in sequence, the bracket (15)is installed on the upper part of the valve body (1), a clamping design is adopted at the lower end of the bracket (15), and the lower end of the bracket (15) is fixed to the valve body (1) by threaded connection and fastened with a bracket locking screw (26).

Description

technical field [0001] The invention relates to a shut-off valve in the technical field of valves, in particular to a Y-type shut-off valve with a detachable living valve seat. Background technique [0002] The globe valve has a wide range of uses, and is the most direct and reliable valve type among all valves. It is not only suitable for medium and low pressure, but also suitable for low temperature, high temperature, high pressure, ultra-high pressure and other working conditions. Y-type globe valve is a kind of globe valve. Since Y-type globe valve has a nearly linear flow path design, it has low flow resistance and higher flow capacity than ordinary straight-through globe valves, and is widely used. The high-temperature and high-pressure globe valves currently used in the market, such as the main steam trap valve for 1000MW ultra-supercritical thermal power units, have a temperature of up to 600°C and a working pressure of up to 30MPa. Most of the imported Y-type globe ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of easy erosion and wear of the sealing surface of the high-temperature and high-pressure Y-type globe valve in thermal power plants, poor online maintainability of the valve, and increase of fluid resistance with the decrease of the valve size.

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