New type of ceramic triple change valve

Abstract

The new-type of ceramic triple change valve can resist scour and wear of medium on the cock, valve body and valve channel and the self-wear of the sealing plane and the sealing pair, and has long service life. The present invention features the sealing ceramic rings in proper positions of cock and valve seat; ceramic lining pipe in the channel, inlet and outlet; the eccentric structure of the cock and the valve body and the connection between central shaft of regulating rotation mechanism and the cock via the valve body axis. The present invention may be used in control and conveyance of medium with particles.

Description

Technical field: [0001] The invention relates to a three-way reversing valve. Especially a new ceramic three-way reversing valve. Background technique: [0002] The three-way reversing valve is a plug valve with a spherical closing member, which includes a valve body, a valve seat, a plug and a rotating mechanism. An inlet and two outlets are arranged on the valve body, and an annular valve seat is arranged at the inlet and the outlet of the valve chamber of the valve body. A cock is arranged in the valve cavity, and the cock and the valve body have a coaxial structure, and the rotating mechanism is connected with the cock at the axis. The cock is a ball with a channel; the channel of the cock can connect the inlet with the two outlets respectively. When the cock connects the inlet with an outlet, the medium enters from the inlet and flows out from the outlet, forming a valve flow path. When the cock rotates 90° around the axis of the valve body, the channel of the cock ...

AI Technical Summary

Problems solved by technology

[0003] When the cock rotates, the flow direction changes and the flow of the medium, the medium continuously scours the cock, valve seat and valve flow path, especially the medium with particles, which seriously washes and wears the cock, valve seat and valve flow path. The cock that constitutes the sealing surface in the current three-way reversing valve is generally made of metal, the valve seat is made of polytetrafluoroethylene, and the sealing surface is composed of metal and non-metallic materials. Metal and polytetrafluoroethylene are not wear-resistant and resistant. The performance of corrosion makes the cock and valve seat easily damaged by the erosion and corrosion of the medium, thus losing the sealing performance

In order to make up for this defect, some three-way reversing valves are sprayed with polytetrafluoroethylene, rubber and other bushings on the parts that are easy to wear. Although the wear resistance of the parts that are easy to wear is improved, its defect is that it is not suitable for high pressure and high temperature. The medium that requires the passage of the medium is lower in temperature and lower in pressure; and because the disadvantages of wear are not removed, even if it is used for low temperature and low pressure medium, the service life is short

[0004] In addition, during the rotation of the cock, the cock and the valve seats at the two outlets are always in close contact, resulting in the self-wearing of the sealing pair. When the sealing pair is worn, the valve will produce internal leakage and must be replaced

[0005] Due to the erosion of the medium, corrosion and self-wear between the cock and the valve seat, the current three-way reversing valve has a short service life and must be replaced frequently

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