Erosion prevention structure for sealing surface of valve

Patent metadata

Field	Value
Publication number	US-10563785-B2
Application number	US-201615744897-A
Country	US
Kind code	B2
Filing date	Nov 14, 2016
Priority date	Sep 29, 2016
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

An erosion prevention structure for a sealing surface of a valve includes a valve body, a valve seat, a valve core, a valve sleeve and a valve rod. A valve seat mounting hole is provided in the valve body and located between a medium outlet and a cavity; the valve seat is arranged in the valve seat mounting hole; the top surface of the valve seat is provided with an annular table; the outside surface of the annular table is a sealing surface A, wherein an included angle is formed between the sealing surface A and a horizontal surface; an annular flange is arranged at the bottom of the valve core and located at the outer side of the valve core; the inside surface of the annular flange is a sealing surface B, wherein an included angle is formed between the sealing surface B and a horizontal surface.

First claim

The invention claimed is:

1. An erosion prevention structure for a sealing surface of a valve, comprising: a valve body, a valve seat, a valve core, a valve sleeve and a valve rod, wherein
the valve body is internally provided with a cavity; a left end and a lower end of the valve body are provided with a medium inlet and a medium outlet respectively; a valve seat mounting hole is provided in the valve body and located between the medium outlet and the cavity;
the valve seat is arranged in the valve seat mounting hole; a top surface of the valve seat is provided with an annular table; an outside surface of the annular table is a first sealing surface, wherein an included angle is formed between the first sealing surface and a horizontal surface;
the valve sleeve penetrating through the cavity from top to bottom is arranged in the valve body; a lower end surface of the valve sleeve is fixed to an outer edge of the valve seat; a plurality of throttle holes are uniformly distributed on a cylindrical surface of the valve sleeve and located at a lower end of the valve sleeve;
the valve core is arranged in the valve sleeve; an outer wall of the valve core is in contact with an inner wall of the valve sleeve; an annular flange is arranged at a bottom of the valve core and located at an outer side of the valve core; an inside surface of the annular flange is a second sealing surface, wherein a second included angle is formed between the second sealing surface and the horizontal surface; both the second sealing surface and the first sealing surface are annular, and an angular difference between the second sealing surface and the first sealing surface is 2 to 5 degrees;
the valve rod is arranged in the valve sleeve and located above the valve core; and the valve rod is connected with the valve core; and
the bottom of the valve core and a bottom of the second sealing surface form a concave surface.

2. The erosion prevention structure for the sealing surface of the valve according to claim 1 , wherein the top surface of the valve seat is provided with a hard alloy layer by overlaying.

3. The erosion prevention structure for the sealing surface of the valve according to claim 1 , wherein the bottom of the valve core is provided with a hard alloy layer by overlaying.

4. The erosion prevention structure for the sealing surface of the valve according to claim 1 , wherein the valve rod is flexibly connected with the valve core.

Assignees

• Li Cenwenda
• Li Wei

Inventors

• Li Cenwenda
• Li Wei

Classifications

• F16K47/08 Primary

  for decreasing pressure {or noise level} and having a throttling member separate from the closure member {, e.g. screens, slots, labyrinths} · CPC title

• F16K31/445

  with exterior sleeve · CPC title

• F16K3/246

  Combination of a sliding valve and a lift valve · CPC title

• F16K1/32 Primary

  Details (details of more general applicability F16K25/00 - F16K51/00) · CPC title

• F16K1/24

  with valve members that, on opening of the valve, are initially lifted from the seat and next are turned around an axis parallel to the seat · CPC title