CN103267166B - Piston-type zero leakage gate valve - Google Patents
Piston-type zero leakage gate valve Download PDFInfo
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- CN103267166B CN103267166B CN201310198546.8A CN201310198546A CN103267166B CN 103267166 B CN103267166 B CN 103267166B CN 201310198546 A CN201310198546 A CN 201310198546A CN 103267166 B CN103267166 B CN 103267166B
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- valve rod
- stuffing box
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Abstract
The present invention relates to a kind of Piston-type zero leakage gate valve, comprise valve body, valve gap, valve rod and valve plate, described valve body top is provided with opening, described valve rod lower end enters body cavity through valve gap, described valve plate is fixed on valve rod lower end and valve seat and is formed and open, close cooperation, sealing mechanism is provided with between described valve rod and valve body openings inwall, described sealing mechanism comprises the stuffing box be arranged in valve body openings, elastic filler and filler pressing sleeve, the bottom of described stuffing box is formed by being set in self-tightening pressure ring assembly on valve rod and axially movable, fluid-tight contact between described self-tightening pressure ring assembly and valve rod and stuffing box wall, UNICOM between bottom described body cavity and described self-tightening pressure ring assembly.When the elastic filler in stuffing box loosens due to Long-Time Service wearing and tearing or appearance of expanding with heat and contract with cold, self-tightening pressure ring assembly is meeting upwardly elastic filler under the effect of valve pocket interior media pressure, reach the object of Leakage prevention, and the pressure of medium is larger, sealing effect is better.
Description
Technical field
The present invention relates to a kind of stop valve, particularly can the Piston-type zero leakage gate valve of fed sheet of a media at elevated pressures.
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 be communicated with body cavity respectively with tapping channel, 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 enters body cavity through valve gap, described valve plate is fixed on valve rod lower end, the inclination of valve plate bi-side is formed with valve seat and opens, close cooperation, being provided with sealing mechanism between described valve rod and valve body openings inwall prevents medium from leaking from the opening on valve body top.Traditional sealing mechanism comprises stuffing box, elastic filler and filler pressing sleeve, compresses elastic filler by filler pressing sleeve, to reach the object of sealing.But this structure be sealed in through Long-Time Service, friction and vibration, the elastic filler in stuffing box there will be and loosens and wearing and tearing, and the gap between valve rod can become large, still can easily occur leaking under high pressure operations; In addition, owing to expanding with heat and contract with cold, valve also can be caused to occur leaking.
Summary of the invention
The object of the invention is to provide a kind of high pressure operations seal performance can better Piston-type zero leakage gate valve for overcoming the deficiencies in the prior art.
The present invention for the adopted technical solution that achieves the above object 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 be communicated with body cavity respectively with tapping channel, 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 enters body cavity through valve gap, described valve plate is fixed on valve rod lower end and valve seat and is formed and open, close cooperation, sealing mechanism is provided with between described valve rod and valve body openings inwall, it is characterized in that: described sealing mechanism comprises the stuffing box be arranged in valve body openings, elastic filler and filler pressing sleeve, the bottom of described stuffing box is formed by being set in self-tightening pressure ring assembly on valve rod and axially movable, described elastic filler is arranged in stuffing box around valve rod, top is compressed by filler pressing sleeve, fluid-tight contact between described self-tightening pressure ring assembly and valve rod and stuffing box wall, UNICOM between bottom described body cavity and described self-tightening pressure ring assembly, described elastic filler is made up of annular self-tightening piston ring, is provided with rigid annulus in the middle of described self-tightening piston ring, and outside the parcel by carbon fiber and graphite of rigid annulus is formed.
Compared with prior art, this Piston-type zero leakage gate valve is by arranging the self-tightening pressure ring assembly that can move axially, when the elastic filler in stuffing box loosens due to Long-Time Service wearing and tearing or appearance of expanding with heat and contract with cold, self-tightening pressure ring assembly can upwardly under the effect of valve pocket interior media pressure, elastic filler is compressed, again becomes densification, reach the object of Leakage prevention, and the pressure of medium is larger, sealing effect is better.
As the further setting of the present invention, described elastic filler is made up of annular self-tightening piston ring, is provided with rigid annulus in the middle of described self-tightening piston ring, and outside the parcel by carbon fiber and graphite of rigid annulus is formed.If the elastic filler in stuffing box all adopts elastic material, under the effect of self-tightening pressure ring assembly pressure medium, amount of deformation is excessive, self-tightening sealing limited efficiency.When centre adopts rigid annulus, particularly annular self-tightening piston ring adopts upper and lower end face to be plane, the cross section of described rigid annulus is oval, during the oval major axis place plane structure vertical with valve rod, the pressure of self-tightening pressure ring assembly concentrates on the carbon fiber and graphite in upper and lower end face and interior outside, and due to the cross section of rigid annulus be oval, under the effect on inclined-plane, carbon fiber and graphite is pressed against both sides, namely press to valve rod and stuffing box wall, therefore sealability greatly improves.
Further arrange as of the present invention, 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 located at after in annular piston seat and is set in together on valve rod, described annular piston seat axially locating is arranged, one end that described piston ring contacts with elastic filler is provided with annular radial flange, described collar flange and stuffing box cross section match, described piston ring and annular piston seat axially can relative movements, described self-tightening pressure ring assembly is circumferentially also provided with some supercharging ducts, described supercharging duct extends to piston ring inside through annular piston seat lower end surface and annular piston seat inside, by valve pocket and the inner UNICOM of piston ring.By above-mentioned setting, pressure medium is exaggerated the axial pressure to elastic filler through pressurized hole, makes Piston-type zero leakage gate valve also can have good self-tightening sealing effect in the occasion that pressure medium is less.
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing 1 is specific embodiment of the invention internal structure sectional view;
Accompanying drawing 2 is sealing mechanism specific embodiment partial enlargement structure sectional view;
Accompanying drawing 3 is another specific embodiment partial enlargement structure sectional view of sealing mechanism.
Embodiment
As Fig. 1, shown in 2, Piston-type zero leakage gate valve comprises valve body 1, valve gap 2, valve rod 3 and valve plate 4, described valve body 1 inner chamber is separated into feed cavity and discharging chamber, and be provided with feeding-passage and tapping channel respectively with valve body 1 inner space, 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 end enters valve body 1 inner chamber through valve gap 2, described valve plate 4 is fixed on valve rod 3 lower end, the inclination of valve plate 4 bi-side is formed with valve seat 5 and opens, close cooperation, valve rod 3 upper end is provided with operation handwheel 6, sealing mechanism is provided with between described valve rod 3 and valve body 1 opening inwall, described sealing mechanism comprises the stuffing box be arranged in cylindrical space in valve body 1 opening, elastic filler and filler pressing sleeve, the bottom of described stuffing box is formed by being set in self-tightening pressure ring assembly 7 on valve rod 3 and axially movable.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 end is pressed with hold-down grid 10, and hold-down grid 10 is connected with valve body 1 by swing bolt 11 will compress filler pressing sleeve 9.Fluid-tight contact between described self-tightening pressure ring assembly 7 and valve rod 3 and stuffing box wall, UNICOM between bottom described valve body 1 inner chamber and described self-tightening pressure ring assembly 7.Self-tightening pressure ring assembly 7 can be made up of independent rigid annular component and the seal ring that is arranged on rigid annular component inner and outer surface.In order to improve sealing effect, described elastic filler 8 is preferably made up of annular self-tightening piston ring, rigid annulus 801 is provided with in the middle of described self-tightening piston ring, rigid annulus 801 outside is wrapped up by carbon fiber and graphite 802 and being formed, the upper and lower end face of described annular self-tightening piston ring is plane, the cross section of described rigid annulus 801 is preferably oval, and oval major axis place straight line is vertical with valve rod 3.In order to improve sealability further, strengthen 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, described piston ring 702 is set in after in annular piston seat 701 and is set on valve rod 3 together, described annular piston seat 701 axially locating is arranged, one end that described piston ring 702 contacts with elastic filler 8 is provided with annular radial flange 7021, described collar flange 7021 matches with stuffing box cross section, described piston ring 702 and annular piston seat 701 axially can relative movements, described self-tightening pressure ring assembly 7 is circumferentially also provided with some supercharging ducts 703, described supercharging duct 703 extends to piston ring 702 through annular piston seat 701 lower end surface and annular piston seat 701 inside inner, by valve pocket and the inner UNICOM of piston ring 702, piston ring 702 inner hole wall is provided with upper and lower two seals ring 704 and is closed by supercharging duct 703 the other end.
Claims (3)
1. a 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 be communicated with body cavity respectively with tapping channel, 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 enters body cavity through valve gap, described valve plate is fixed on valve rod lower end, the inclination of valve plate bi-side is formed with valve seat and opens, close cooperation, sealing mechanism is provided with between described valve rod and valve body openings inwall, it is characterized in that: described sealing mechanism comprises the stuffing box be arranged in valve body openings, elastic filler and filler pressing sleeve, the bottom of described stuffing box is formed by being set in self-tightening pressure ring assembly on valve rod and axially movable, described elastic filler is arranged in stuffing box around valve rod, top is compressed by filler pressing sleeve, fluid-tight contact between described self-tightening pressure ring assembly and valve rod and stuffing box wall, UNICOM between bottom described body cavity and described self-tightening pressure ring assembly, described elastic filler is made up of annular self-tightening piston ring, is provided with rigid annulus in the middle of described self-tightening piston ring, and outside the parcel by carbon fiber and graphite of rigid annulus is formed.
2. Piston-type zero leakage gate valve according to claim 1, 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 rigid annulus is oval, and oval major axis place straight line is vertical with valve rod.
3. 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 located at after in annular piston seat and is set in together on valve rod, described annular piston seat axially locating is arranged, one end that described piston ring contacts with elastic filler is provided with annular radial flange, described collar flange and stuffing box cross section match, described piston ring and annular piston seat axially can relative movements, described self-tightening pressure ring assembly is circumferentially also provided with some supercharging ducts, described supercharging duct extends to piston ring inside through annular piston seat lower end surface and annular piston seat inside, by valve pocket and the inner UNICOM of piston ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310198546.8A CN103267166B (en) | 2013-05-23 | 2013-05-23 | Piston-type zero leakage gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310198546.8A CN103267166B (en) | 2013-05-23 | 2013-05-23 | Piston-type zero leakage gate valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103267166A CN103267166A (en) | 2013-08-28 |
| CN103267166B true CN103267166B (en) | 2015-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310198546.8A Expired - Fee Related CN103267166B (en) | 2013-05-23 | 2013-05-23 | Piston-type zero leakage gate valve |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246400B (en) * | 2016-09-23 | 2019-08-06 | 浙江桓宇汽配有限公司 | A kind of engine piston ring of carbon fiber-containing composite layer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826181A (en) * | 1988-02-09 | 1989-05-02 | Union Carbide Corporation | Seal utilizing composites of flexible graphite particles and amorphous carbon |
| US6247679B1 (en) * | 1998-03-02 | 2001-06-19 | T&S Solutions, Inc. | Valve stem and method of manufacture; improved stem packing |
| CN201593614U (en) * | 2010-01-08 | 2010-09-29 | 良精集团有限公司 | High-pressure self-sealing packing shutoff valve |
| CN102313074A (en) * | 2011-09-29 | 2012-01-11 | 天津百利展发集团有限公司 | Automatic filling sealing structure for high-pressure valve |
| CN202132531U (en) * | 2011-07-11 | 2012-02-01 | 精工阀门有限公司 | Sluice valve |
| CN203286119U (en) * | 2013-05-23 | 2013-11-13 | 中亚阀门有限公司 | Piston type zero-leakage gate valve |
-
2013
- 2013-05-23 CN CN201310198546.8A patent/CN103267166B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826181A (en) * | 1988-02-09 | 1989-05-02 | Union Carbide Corporation | Seal utilizing composites of flexible graphite particles and amorphous carbon |
| US6247679B1 (en) * | 1998-03-02 | 2001-06-19 | T&S Solutions, Inc. | Valve stem and method of manufacture; improved stem packing |
| CN201593614U (en) * | 2010-01-08 | 2010-09-29 | 良精集团有限公司 | High-pressure self-sealing packing shutoff valve |
| CN202132531U (en) * | 2011-07-11 | 2012-02-01 | 精工阀门有限公司 | Sluice valve |
| CN102313074A (en) * | 2011-09-29 | 2012-01-11 | 天津百利展发集团有限公司 | Automatic filling sealing structure for high-pressure valve |
| CN203286119U (en) * | 2013-05-23 | 2013-11-13 | 中亚阀门有限公司 | Piston type zero-leakage gate valve |
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| Publication number | Publication date |
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| CN103267166A (en) | 2013-08-28 |
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Granted publication date: 20151021 Termination date: 20210523 |