阅读说明：本技术 一种截止阀 (Stop valve ) 是由 卓万安 于 2019-09-23 设计创作，主要内容包括：本发明涉及一种截止阀。本发明包括阀体、阀杆、阀芯以及密封面保护罩,所述阀芯设置在阀杆的下端；所述阀体内部分别设有导流腔、进水腔和出水腔；所述导流腔沿竖直方向延伸,进水腔和出水腔均与导流腔连通；所述导流腔的底部还设有阀座；所述密封面保护罩固定安装在阀座上；所述密封面保护罩的上部与导流腔连通,所述密封面保护罩的罩壁四周环设有多个减压孔。本发明压力缓冲效果好,且使用寿命长。(The invention relates to a stop valve. The invention comprises a valve body, a valve rod, a valve core and a sealing surface protection cover, wherein the valve core is arranged at the lower end of the valve rod; a flow guide cavity, a water inlet cavity and a water outlet cavity are respectively arranged in the valve body; the water inlet cavity and the water outlet cavity are communicated with the diversion cavity; the bottom of the flow guide cavity is also provided with a valve seat; the sealing surface protection cover is fixedly arranged on the valve seat; the upper portion of the sealing surface protection cover is communicated with the flow guide cavity, and a plurality of pressure reducing holes are annularly formed in the periphery of the wall of the sealing surface protection cover. The invention has good pressure buffering effect and long service life.)

1. A stop valve, characterized by: the valve comprises a valve body (14), a valve rod (12), a valve core (15) and a sealing surface protection cover (13), wherein the valve core (15) is arranged at the lower end of the valve rod (12);

A flow guide cavity (16), a water inlet cavity (17) and a water outlet cavity (18) are respectively arranged in the valve body (14); the flow guide cavity (16) extends along the vertical direction, and the water inlet cavity (17) and the water outlet cavity (18) are both communicated with the flow guide cavity (16); the bottom of the flow guide cavity (16) is also provided with a valve seat (19); the sealing surface protection cover (13) is fixedly arranged on the valve seat (19); the upper part of the sealing surface protection cover (13) is communicated with the flow guide cavity (16), and a plurality of pressure reduction holes (1) are annularly arranged on the periphery of the cover wall of the sealing surface protection cover (13);

The valve core (15) is arranged at the bottom of the valve rod (12); the valve rod (12) is arranged in the diversion cavity (16) and can move up and down relative to the diversion cavity (16) so that the valve core (15) can be placed inside the sealing surface protection cover (13) when being closed on the valve seat (19).

2. A shut-off valve as claimed in claim 1, wherein: and the upper part of the valve rod (12) is also provided with a control rotary disc (110).

3. A shut-off valve as claimed in claim 1, wherein: and a packing gland (11) is also arranged on the valve body (14).

4. A shut-off valve as claimed in claim 1, wherein: the valve rod (12) is in threaded connection with the inner wall of the flow guide cavity (16) of the valve body (14).

5. A shut-off valve as claimed in claim 1, wherein: the aperture range of the pressure reducing hole (1) is 0.3-1 cm.

Technical Field

The invention relates to a stop valve.

Background

the stop valve, also called stop valve, is one of the most widely used valves, and it is popular because the friction between the sealing surfaces is small in the opening and closing process, it is durable, the opening height is not large, it is easy to manufacture, it is convenient to maintain, it is not only suitable for middle and low pressure, but also for high pressure. The valve plays an important role in cutting off and throttling medium in a pipeline where the valve is located, and in the pipeline needing high-pressure cut-off, because the cut-off valve bears huge pressure for a long time, a valve core of the valve is easy to wear and deform, and the service life of the whole valve is influenced.

Disclosure of Invention

The invention aims to: the stop valve has the advantages of good pressure buffering effect and long service life.

The invention is realized by the following technical scheme: a stop valve, characterized by: the valve comprises a valve body, a valve rod, a valve core and a sealing surface protection cover, wherein the valve core is arranged at the lower end of the valve rod;

A flow guide cavity, a water inlet cavity and a water outlet cavity are respectively arranged in the valve body; the water inlet cavity and the water outlet cavity are communicated with the diversion cavity; the bottom of the flow guide cavity is also provided with a valve seat; the sealing surface protection cover is fixedly arranged on the valve seat; the upper portion of the sealing surface protection cover is communicated with the flow guide cavity, and a plurality of pressure reducing holes are annularly formed in the periphery of the wall of the sealing surface protection cover.

The valve core is arranged at the bottom of the valve rod; the valve rod is arranged in the flow guide cavity and can move up and down relative to the flow guide cavity, so that the valve core can be arranged in the sealing surface protection cover when being closed on the valve seat.

compared with the prior art, the invention has the beneficial effects that: according to the scheme, the sealing surface protection cover is arranged, so that when the valve is closed, the valve core is prevented from being directly impacted by high-pressure water flow in the water inlet cavity, the service life of the valve core is greatly prolonged, and the service life of the whole valve is prolonged; in addition, when the valve is opened, the high-pressure water flow in the water inlet cavity can not directly impact the inner wall of the valve body due to the blocking effect of the sealing surface protection cover, and is forced to enter the water outlet cavity at the bottom of the valve seat through the pressure reducing hole in the sealing surface protection cover, the water pressure is further reduced in the process that the high-pressure water flow passes through the pressure reducing hole, and the burden that the inner wall of the valve body is impacted by high water pressure is reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a face protection cover configuration.

Description of reference numerals: 1-pressure reducing hole, 11-packing gland, 12-valve rod, 13-sealing surface protective cover, 14-valve body, 15-valve core, 16-flow guide cavity, 17-water inlet cavity, 18-water outlet cavity, 19-valve seat and 110-control rotary table.

Detailed Description

the invention is described in detail below with reference to the following description of the drawings:

As shown in fig. 1-2, the present invention includes a valve body 14, a valve stem 12, a valve core 15 and a sealing surface protection cover 13, wherein the valve core 15 is arranged at the lower end of the valve stem 12;

A flow guide cavity 16, a water inlet cavity 17 and a water outlet cavity 18 are respectively arranged in the valve body 14; the diversion cavity 16 extends along the vertical direction, and the water inlet cavity 17 and the water outlet cavity 18 are both communicated with the diversion cavity 16; the bottom of the diversion cavity 16 is also provided with a valve seat 19; the sealing surface protection cover 13 is fixedly arranged on the valve seat 19; the upper portion of the sealing surface protection cover 13 is communicated with the diversion cavity 16, and a plurality of pressure reduction holes 1 are annularly arranged on the periphery of the cover wall of the sealing surface protection cover 13.

The valve core 15 is arranged at the bottom of the valve rod 12; the valve stem 12 is disposed in the pilot chamber 16 and is movable up and down relative to the pilot chamber 16 so that the valve element 15 can be disposed inside the seal face protection cover 13 when closed on the valve seat 19.

the upper portion of the valve stem 12 is also mounted with a control dial 110. And a packing gland 11 is also arranged on the valve body 14. The valve rod 12 is in threaded connection with the inner wall of the diversion cavity 16 of the valve body 14. The aperture range of the pressure reducing hole 1 is 0.3-1 cm. The aperture of the pressure-reducing vent 1 is 0.5 cm in this example.

While the invention has been illustrated and described with respect to specific embodiments and alternatives thereof, it will be understood that various changes and modifications can be made without departing from the spirit and scope of the invention. It is understood, therefore, that the invention is not to be in any way limited except by the appended claims and their equivalents.