CN203286119U - Piston type zero-leakage gate valve - Google Patents
Piston type zero-leakage gate valve Download PDFInfo
- Publication number
- CN203286119U CN203286119U CN2013202866512U CN201320286651U CN203286119U CN 203286119 U CN203286119 U CN 203286119U CN 2013202866512 U CN2013202866512 U CN 2013202866512U CN 201320286651 U CN201320286651 U CN 201320286651U CN 203286119 U CN203286119 U CN 203286119U
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- valve rod
- piston
- stuffing box
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Abstract
The utility model relates to a piston type zero-leakage gate valve. The piston type zero-leakage gate valve comprises a valve body, a valve cover, a valve rod and a valve plate, wherein an opening is formed in the upper part of the valve body; the lower end of the valve rod penetrates through the valve cover and enters an inner cavity of the valve body; the valve plate is fixed at the lower end of the valve rod and is opened and closed in cooperation with a valve seat; a sealing mechanism is arranged between the valve rod and the inner wall of the opening of the valve body, and comprises a stuffing box, elastic stuffing and a stuffing pressing sleeve, which are arranged in the opening of the valve body; the bottom of the stuffing box consists of a self-tightening pressing ring assembly which is sleeved on the valve rod and is movable axially; the self-tightening pressing ring assembly is in liquid-tight contact with the valve rod and the wall of the stuffing box; the inner cavity of the valve body is communicated with the bottom of the self-tightening pressing ring assembly. When the elastic stuffing in the stuffing box is loosened due to abrasion caused by long-time usage or thermal expansion and cold contraction, the self-tightening pressing ring assembly can extrude the elastic stuffing upwards under the action of the pressure of a medium in a valve cavity, so that the aim of preventing leakage is achieved, and a sealing effect is better along with the increase of the pressure of the medium.
Description
Technical field
The utility model relates to a kind of stop valve, particularly can be at the piston type zero-leakage gate valve of fed sheet of a media under high pressure.
Background technique
stop valve is at chemical industry, the equipment of extensive use in petroleum industry, existing stop valve structure generally includes valve body, valve gap, valve rod and valve plate, described body cavity is separated into feed cavity and discharging chamber, and be provided with feeding-passage and tapping channel is communicated with body cavity respectively, described valve plate is arranged in body cavity, the position of body cavity and feed cavity and discharging chamber UNICOM is equipped with the valve seat of inclination, described valve body top is provided with opening, described valve rod lower end is passed valve gap and is entered body cavity, described valve plate is fixed on the valve rod lower end, the valve plate bi-side tilt and form and open with valve seat, close cooperation, be provided with sealing mechanism between described valve rod and valve body openings inwall and prevent that medium from leaking from the opening on valve body top.Traditional sealing mechanism comprises stuffing box, elastic filler and filler pressing sleeve, by filler pressing sleeve, compresses elastic filler, to reach the purpose of sealing.But being sealed in through long-term use, friction and vibration of this structure, the elastic filler in stuffing box there will be loosening and wearing and tearing, and the gap between valve rod can become greatly, still can easily occur leakage under the high-pressure work condition; In addition,, owing to expanding with heat and contract with cold, also can cause valve to occur leaking.
Summary of the invention
The purpose of this utility model is to provide a kind of high-pressure work condition seal performance can better the piston type zero-leakage gate valve for overcoming the deficiencies in the prior art.
the utility model is that the achieve the above object technical solution that adopts is as follows: a kind of piston type zero-leakage gate valve, comprise valve body, valve gap, valve rod and valve plate, described body cavity is separated into feed cavity and discharging chamber, and be provided with feeding-passage and tapping channel is communicated with body cavity respectively, described valve plate is arranged in body cavity, body cavity is provided with horizontal valve port and is communicated with feed cavity and discharging chamber, valve port is provided with horizontal valve seat, described valve body top is provided with opening, described valve rod lower end is passed valve gap and is entered body cavity, described valve plate is fixed on the valve rod lower end and valve seat formation is opened, close cooperation, be provided with sealing mechanism between described valve rod and valve body openings inwall, it is characterized in that: described sealing mechanism comprises the stuffing box that is arranged in valve body openings, elastic filler and filler pressing sleeve, the bottom of described stuffing box is by being set on valve rod and axially movable self-tightening pressure ring assembly forms, described elastic filler is arranged in stuffing box around valve rod, top is compressed by filler pressing sleeve, the liquid-tight contact between described self-tightening pressure ring assembly and valve rod and stuffing box wall, UNICOM between described body cavity and described self-tightening pressure ring assembly bottom.
Compared with prior art, this piston type zero-leakage gate valve can axially movable self-tightening pressure ring assembly by arranging, when the elastic filler in stuffing box due to long-term use wearing and tearing or expand with heat and contract with cold occur when loosening, the self-tightening pressure ring assembly is upwards extruding under the effect of valve pocket interior media pressure, make the elastic filler compression, again become densification, reach the purpose of Leakage prevention, and the pressure of medium is larger, and sealing effect is better.
As further setting of the present utility model, described elastic filler consists of annular self-tightening piston ring, is provided with the rigidity annulus in the middle of described self-tightening piston ring, and rigidity annulus outside consists of the carbon fiber and graphite parcel.If elastic material is all adopted in the elastic filler in stuffing box, amount of deformation is excessive under the effect of self-tightening pressure ring assembly pressure medium, and the self-tightening sealing effect is limited.When the rigidity annulus is adopted in centre, particularly to adopt upper and lower end face be plane for annular self-tightening piston ring, the cross section of described rigidity annulus is oval, during oval plane, the major axis place structure vertical with valve rod, the pressure concentration of self-tightening pressure ring assembly is on the carbon fiber and graphite in upper and lower end face and the interior outside, and because the cross section of rigidity annulus is oval, carbon fiber and graphite is pressed against both sides under the effect on inclined-plane, namely press to valve rod and stuffing box wall, so sealability improves greatly.
further arrange as of the present utility model, described self-tightening pressure ring assembly comprises annular piston seat and piston ring, the internal diameter of described piston ring coordinates with valve lever clearance, external diameter and piston seat internal diameter Spielpassung, described piston ring set is set on valve rod after being located in the annular piston seat together, described annular piston seat axially locating arranges, the end that described piston ring contacts with elastic filler is provided with the annular radial flange, described collar flange and stuffing box cross section match, described piston ring and annular piston seat axially can relatively move, described self-tightening pressure ring assembly is along circumferentially also being provided with some superchargings duct, described supercharging duct extends to piston ring inside through annular piston seat lower end surface and annular piston seat inside, with valve pocket and the inner UNICOM of piston ring.By above-mentioned setting, pressure medium process pressurized hole has amplified the axial pressure to elastic filler, makes the piston type zero-leakage gate valve, in the less occasion of pressure medium, good self-tightening sealing effect can be arranged also.
The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.
Description of drawings
Accompanying drawing 2 is the local structure for amplifying sectional view of sealing mechanism specific embodiment;
Accompanying drawing 3 is the local structure for amplifying sectional view of another specific embodiment of sealing mechanism.
Embodiment
as Fig. 1, shown in 2, the piston type zero-leakage gate valve comprises valve body 1, valve gap 2, valve rod 3 and flap 4, described valve body 1 inner chamber is separated into feed cavity and discharging chamber, and be provided with feeding-passage and tapping channel is communicated with valve body 1 inner chamber respectively, described valve plate 4 is arranged in body cavity, the position of body cavity and feed cavity and discharging chamber UNICOM is equipped with the valve seat 5 of inclination, described valve body 1 top is provided with opening, described valve rod 3 lower ends are passed valve gap 2 and are entered valve body 1 inner chamber, described valve plate 4 is fixed on valve rod 3 lower ends, valve plate 4 bi-side tilt and form and open with valve seat 5, close cooperation, valve rod 3 upper ends are provided with operation handwheel 6, be provided with sealing mechanism between described valve rod 3 and valve body 1 opening inwall, described sealing mechanism comprises and is arranged on the stuffing box that is cylindric space in valve body 1 opening, elastic filler and filler pressing sleeve, the bottom of described stuffing box is by being set on valve rod 3 and axially movable self-tightening pressure ring assembly 7 forms.Described elastic filler 8 is arranged in stuffing box around valve rod 3, and top is by being provided with filler pressing sleeve 9, and filler pressing sleeve 9 upper ends are pressed with hold-down grid 10, and hold-down grid 10 is connected and will compresses filler pressing sleeve 9 with valve body 1 by swing bolt 11.The liquid-tight contact between described self-tightening pressure ring assembly 7 and valve rod 3 and stuffing box wall, UNICOM between described valve body 1 inner chamber and described self-tightening pressure ring assembly 7 bottoms.Self-tightening pressure ring assembly 7 can be to consist of independent rigid annular member and the seal ring that is arranged on rigid annular member inner and outer surface.In order to improve sealing effect, described elastic filler 8 preferably consists of annular self-tightening piston ring, be provided with rigidity annulus 801 in the middle of described self-tightening piston ring, rigidity annulus 801 outsides consist of carbon fiber and graphite 802 parcels, the upper and lower end face of described annular self-tightening piston ring is plane, it is oval that the cross section of described rigidity annulus 801 is preferably, and plane, oval major axis place is vertical with valve rod 3.in order further to improve sealability, strengthen the self-tightening effect, as shown in Figure 3, in this specific embodiment, described self-tightening pressure ring assembly 7 can also comprise annular piston seat 701 and piston ring 702, the internal diameter of described piston ring 702 and valve rod 3 Spielpassung, external diameter and piston seat 701 internal diameter Spielpassung, after being set in annular piston seat 701, described piston ring 702 is set in together on valve rod 3, described annular piston seat 701 axially locating settings, the end that described piston ring 702 contacts with elastic filler 8 is provided with annular radial flange 7021, described collar flange 7021 matches with the stuffing box cross section, described piston ring 702 axially can relatively move with annular piston seat 701, described self-tightening pressure ring assembly 7 is along circumferentially also being provided with some superchargings duct 703, described supercharging duct 703 extends to piston ring 702 inside through annular piston seat 701 lower end surfaces and annular piston seat 701 inside, with valve pocket and the inner UNICOM of piston ring 702, piston ring 702 inner hole walls are provided with up and down two seals ring 704 with 703 the other end sealings of supercharging duct.
Claims (4)
1. piston type zero-leakage gate valve, comprise valve body, valve gap, valve rod and valve plate, described body cavity is separated into feed cavity and discharging chamber, and be provided with feeding-passage and tapping channel is communicated with body cavity respectively, described valve plate is arranged in body cavity, the position of body cavity and feed cavity and discharging chamber UNICOM is equipped with the valve seat of inclination, described valve body top is provided with opening, described valve rod lower end is passed valve gap and is entered body cavity, described valve plate is fixed on the valve rod lower end, the valve plate bi-side tilt and form and open with valve seat, close cooperation, be provided with sealing mechanism between described valve rod and valve body openings inwall, it is characterized in that: described sealing mechanism comprises the stuffing box that is arranged in valve body openings, elastic filler and filler pressing sleeve, the bottom of described stuffing box is by being set on valve rod and axially movable self-tightening pressure ring assembly forms, described elastic filler is arranged in stuffing box around valve rod, top is compressed by filler pressing sleeve, the liquid-tight contact between described self-tightening pressure ring assembly and valve rod and stuffing box wall, UNICOM between described body cavity and described self-tightening pressure ring assembly bottom.
2. piston type zero-leakage gate valve according to claim 1, it is characterized in that: described elastic filler consists of annular self-tightening piston ring, is provided with the rigidity annulus in the middle of described self-tightening piston ring, and rigidity annulus outside consists of the carbon fiber and graphite parcel.
3. piston type zero-leakage gate valve according to claim 2, it is characterized in that: the upper and lower end face of described annular self-tightening piston ring is plane, and the cross section of described rigidity annulus is oval, and plane, oval major axis place is vertical with valve rod.
4. piston type zero-leakage gate valve according to claim 1, it is characterized in that: described self-tightening pressure ring assembly comprises annular piston seat and piston ring, the internal diameter of described piston ring coordinates with valve lever clearance, external diameter and piston seat internal diameter Spielpassung, described piston ring set is set on valve rod after being located in the annular piston seat together, described annular piston seat axially locating arranges, the end that described piston ring contacts with elastic filler is provided with the annular radial flange, described collar flange and stuffing box cross section match, described piston ring and annular piston seat axially can relatively move, described self-tightening pressure ring assembly is along circumferentially also being provided with some superchargings duct, described supercharging duct extends to piston ring inside through annular piston seat lower end surface and annular piston seat inside, with valve pocket and the inner UNICOM of piston ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202866512U CN203286119U (en) | 2013-05-23 | 2013-05-23 | Piston type zero-leakage gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202866512U CN203286119U (en) | 2013-05-23 | 2013-05-23 | Piston type zero-leakage gate valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203286119U true CN203286119U (en) | 2013-11-13 |
Family
ID=49542481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202866512U Withdrawn - After Issue CN203286119U (en) | 2013-05-23 | 2013-05-23 | Piston type zero-leakage gate valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203286119U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267166A (en) * | 2013-05-23 | 2013-08-28 | 中亚阀门有限公司 | Piston-type zero leakage gate valve |
-
2013
- 2013-05-23 CN CN2013202866512U patent/CN203286119U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267166A (en) * | 2013-05-23 | 2013-08-28 | 中亚阀门有限公司 | Piston-type zero leakage gate valve |
| CN103267166B (en) * | 2013-05-23 | 2015-10-21 | 中亚阀门有限公司 | Piston-type zero leakage gate valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20151021 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |