CN204004475U - A kind of piston type stop valve - Google Patents
A kind of piston type stop valve Download PDFInfo
- Publication number
- CN204004475U CN204004475U CN201420448099.7U CN201420448099U CN204004475U CN 204004475 U CN204004475 U CN 204004475U CN 201420448099 U CN201420448099 U CN 201420448099U CN 204004475 U CN204004475 U CN 204004475U
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- Prior art keywords
- sealing ring
- plunger
- valve
- cage cover
- upper sealing
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of piston type stop valve, valve rod lower end is connected with plunger, plunger stretches into body cavity, the inner chamber top of valve body is provided with upper sealing ring, body cavity bottom is provided with circle platform, set gradually cage cover and lower sealing ring from upper sealing ring to enclosing platform, the internal diameter of upper sealing ring, cage cover, lower sealing ring and circle platform all coincide with plunger outer diameter, cage cover sidewall is provided with the through hole that connects cage cover inner chamber, body cavity and outlet passage, and the length of plunger is greater than the distance along edge under lower sealing ring on upper sealing ring.The novel body cavity at stop valve of this enforcement, adopts cage cover, plunger and upper and lower seal ring to form an integral sealing chamber, uses piston seal principle, improve sealability, and the wearing and tearing of each sealed member is little, can extend the working life of stop valve.
Description
Technical field
The utility model belongs to stop valve technical field, more specifically says, relates to a kind of piston type stop valve.
Background technique
Stop valve is a kind of steam line of power station or ducted valve of the poisonous gas of petroleum chemical industry of being arranged on.The utilization of stop valve and quantity are very extensive, have dozens of specification according to structure and purposes.Why there are various valves, because every kind of valve can only meet operating mode and designing requirement partly, and the military service cycle is very short in exceedingly odious operating mode, the steam line in for example thermal power plant is mainly drawn from turbine body or boiler-steam dome, therefore there is the extreme damage of High Temperature and steam water two phase flow, and for example stop in pipeline at chemical industry toxicity gas, sealingly secure is most important.The stop valve that specification is various brings certain difficulty to user's type selecting and cost control.
Along with the continuous progress of modern processing and sealing material, there is a kind of piston type stop valve that can meet multiple service condition, the open-shut device that its valve rod lower end connects is piston.But in existing piston valve or traditional any stop valve, sealing pair is plane or conical surface seal, and is arranged on the throat of valve, namely on the interior minimum stream of valve pocket cross section.When keying, MEDIA FLOW produces pressure variation because sectional area changes in the time of sealing surface, there is transformation of energy, and between sealing pair, need necessary sealing force effect, this power produces friction on sealing pair, so in valve opening and closing process, sealing surface will bear cavitation damage, erosion damage and mechanical damage, thereby affect sealability, reduce the working life of stop valve.
Model utility content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of piston type stop valve is provided, adopt plunger, cage cover, upper sealing ring, lower sealing ring and valve body to form an integral sealing chamber, improve sealability, and each sealed member is without cavitation damage, machinery-free weares and teares, and can extend the working life of stop valve.
For achieving the above object, the utility model provides a kind of piston type stop valve, comprise handwheel, bonnet, valve body, valve rod, plunger, upper sealing ring, handwheel is connected with valve rod upper end by locking nut, bonnet top is provided with Stem Mut, bonnet is connected with valve body, valve inner is provided with inlet channel, the inner chamber of outlet passage and connection inlet channel and outlet passage, stem exterior surface is provided with screw thread, valve rod is through the Stem Mut at bonnet top, valve rod lower end is connected with plunger, plunger stretches into body cavity, the inner chamber top of valve body is provided with upper sealing ring, body cavity bottom is provided with circle platform, set gradually cage cover and lower sealing ring from upper sealing ring to platform, upper sealing ring, cage cover, the internal diameter of lower sealing ring and circle platform all coincide with plunger outer diameter, cage cover sidewall is provided with and connects cage cover inner chamber, the through hole of body cavity and outlet passage, the length of plunger is greater than the distance along edge under lower sealing ring on upper sealing ring, rotate handwheel, valve rod drives plunger motion, is communicated with or cut-off valve intracoelomic cavity, thereby opens or valve body.
Further, upper sealing ring and lower sealing ring adopt 316 reinforced type flexible graphite seal rings.
Further, valve rod is connected by clip nut with plunger.
Further, valve rod lower end and plunger joint are provided with thrust pad.
The utility model piston type stop valve, at the body cavity of stop valve, adopts cage cover, plunger and upper and lower seal ring to form an integral sealing chamber, and its sealability is better than existing lumen sealing.Upper and lower seal ring outer surface and valve body form sealing, internal surface contacts with the cylndrical surface of plunger and forms piston type sealing, in the time of valve closing, can not be subject to unnecessary external force, and plunger is only subject to the effect of seal ring in closed chamber, can not produce wearing and tearing to plunger, and between cage cover and plunger, be only gap stream mode, almost in passive state.What is more important, in the utility model, medium is under the motion of plunger, to realize afterflow or cutout, in whole process, the sectional area of plunger does not change, so the flow section in media flow process does not also change, in the situation that not considering other factors, constant flow section has ensured can not occur when medium moves in valve pocket change of state, therefore do not have any physical change, do not have conversion process of energy, thereby be not have cavitation to produce arranging a movement process.The destruction that in visible the utility model, upper and lower seal ring is subject to and wear and tear little, thereby extend working life of piston type stop valve.
Brief description of the drawings
Fig. 1 is the embodiment sectional view of the utility model piston type stop valve.
Identifier declaration: 1: locking nut; 2: handwheel; 3: valve rod; 4: stud; 5: nut; 6: bonnet; 7: upper sealing ring; 8: plunger; 9: cage cover; 10: lower sealing ring; 11: valve body; 12: Stem Mut; 13: clip nut; 14: thrust pad; 15: circle platform.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, so that those skilled in the art understands the utility model better.Requiring particular attention is that, in the following description, in the time that perhaps the detailed description of known function and design can desalinate main contents of the present utility model, these are described in here and will be left in the basket.
Fig. 1 is the embodiment sectional view of the utility model piston type stop valve.In the present embodiment, as shown in Figure 1, the critical piece of the utility model piston type stop valve comprises handwheel 2, bonnet 6, valve body 11, valve rod 3, plunger 8, upper sealing ring 7, cage cover 9, lower sealing ring 10, wherein:
Handwheel 2 is connected with valve rod 3 upper ends by locking nut 1, bonnet 6 tops are provided with Stem Mut 12, bonnet 6 is connected by stud 4, nut 5 with valve body 11, valve body 11 inside are provided with inlet channel, outlet passage and connect the inner chamber of inlet channel and outlet passage, valve rod 3 outer surfaces are provided with the screw thread coordinating with Stem Mut 12, valve rod 3 is through the Stem Mut 12 at bonnet 6 tops, and valve rod 3 lower ends are connected with plunger 8, and plunger 8 stretches into valve body 11 inner chambers.Visible, by rotation hand wheel 2, valve rod 3 has had relative movement with Stem Mut 12, can make valve rod 3 move up or down, thereby drives plunger 8 to move up and down, and is communicated with or cuts off 11 inner chambers, makes medium blocking-up or passes through.
Plunger 8 is open-shut device of the utility model piston type stop valve, and in the time closing stop valve, the sealability at plunger 8 places is vital.In the utility model, the mode that adopts upper sealing ring 7 and lower sealing ring 10 to combine realizes sealing.The inner chamber top of valve body 11 is provided with upper sealing ring 7, valve body 11 intracavity bottoms, be near inner chamber and inlet channel joint, be provided with circle platform 15, set gradually cage cover 9 and lower sealing ring 10 from upper sealing ring 7 to circle platform 15, bonnet 6 is pressed on upper sealing ring 7, and bonnet 6 and 15 combinations of circle platform, carry out position limitation to upper sealing ring 7, cage cover 9 and lower sealing ring 10.The internal diameter of upper sealing ring 7, cage cover 9, lower sealing ring 10 and circle platform 15 is all identical, all coincide with plunger 8 external diameters, and in the present embodiment, the axis of upper sealing ring 7, cage cover 9, lower sealing ring 10 and circle platform 15 all point-blank.Cage overlaps 9 sidewalls and is provided with and connects cage and overlap the through hole of 9 inner chambers, valve body 11 inner chambers and outlet passage.The length of plunger 8 is greater than on upper sealing ring 7 along the distance to 10 times edges of lower sealing ring.
Working procedure of the present utility model is: handwheel 2 is rotated to the end of to, now plunger 8 lower ends are positioned at lower sealing ring 10 places, valve closing, medium enters valve body 11 from inlet channel, plunger 8, cage cover 9 and upper sealing ring 7, lower sealing ring 10 form closed chamber, medium is isolated from outside closed chamber, stops medium to enter valve body 11 inner chambers; Rotate up handwheel 2, make valve rod 3 drive plunger 8 to move upward, valve opening, medium, by lower sealing ring 10 and cage cover 9, enters cage and overlaps 9 inner chambers, and the through hole that overlaps 9 sidewalls by cage flows to outlet passage, enters successor devices.The unlatching of valve body or to close be to realize between upper sealing ring 7 in body cavity, cage cover 9 and lower sealing ring 10 in visible the utility model.
In the utility model, cage cover 9, plunger 8 and upper sealing ring 7, lower sealing ring 10 form an integral sealing chamber, have broken traditional lumen seal form, have formed positive confinement.In whole valve working process, upper sealing ring 7, lower sealing ring 10 all the time with valve body 11 in sealing state, and because the length of plunger 8 is greater than, on upper sealing ring 7, edge is to the distance on 10 times edges of lower sealing ring, and plunger 8 and upper sealing ring 7 are also all the time in sealing state.
In the utility model, in the time of valve opening and closing, because cage cover 9 is meronts, now plunger moves up and down in upper-lower seal ring 10 and cage cover 9, between upper-lower seal ring 10 and cage cover 9 and plunger 8, it is eternal sealing state, plunger 8 is equivalent to piston, and upper sealing ring 7, cage cover 9 and lower sealing ring 10 have formed a cylinder body, piston seal principle of the present utility model that Here it is.On plunger 8, move, had relative displacement with lower seal 10 rings and cage cover 9, now medium can pass through valve body inlet channel, after flow through lower sealing ring 10 and cage cover 9, flows out from valve outlet.When plunger 8 moves down, plunger 8 forms sealing with upper-lower seal ring 10 and cage cover 9, has isolated import and the outlet of valve body, and medium will be completely severed.Upper-lower seal ring 10 internal surfaces carry out face with plunger 8 outer cylinders and contact, forming surface sealing.In the present embodiment, what upper sealing ring 7 and lower sealing ring 10 adopted is 316 reinforced type flexible graphite seal rings, and this is that a kind of main material is the Special seal of graphite, not only can not bring wearing and tearing to plunger 8, on the contrary plunger 8 is had to suitable lubricated and protective function.In the time of valve opening, medium circulation; in the medium channel that lower sealing ring 10 and cage cover 9 form; because lower sealing ring 10 is identical with the internal diameter of cage cover 9; in media flow process, can not cause pressure drop because sectional area changes; while avoiding medium energy to discharge, produce cavitation or steam flashing; lower sealing ring 10 and plunger are produced to destruction; and cage cover 9 can be protected washing away that upper sealing ring 7 and lower sealing ring 10 avoid that medium motion causes, thereby avoid medium motion that upper sealing ring 7 and lower sealing ring 10 are produced and damaged.In medium motion process, be plunger 8 outer surfaces of not flowing through, so main open-shut device plunger 8 is not produced to erosion damage yet simultaneously.
In addition, because the internal diameter of upper sealing ring 7, lower sealing ring 10 and cage cover 9 is identical, be conducive to the steady motion of plunger 8, make the rotation operation of handwheel 2 more laborsaving.
In the present embodiment, valve rod 3 is connected by clip nut with plunger 8, is convenient to installation and maintenance.In order to make plunger in valve opening and closing process not be subject to impulsive load, be provided with thrust pad 14 in valve rod 3 lower ends and plunger 8 joints, prevent from making because of External Force Acting in valve working process the plunger load that withstands shocks.
Claims (4)
1. a piston type stop valve, comprise handwheel (2), bonnet (6), valve body (11), valve rod (3), plunger (8), upper sealing ring (7), described handwheel (2) is connected with valve rod (3) upper end, bonnet (6) top is provided with Stem Mut (12), bonnet (6) is connected with valve body (11), valve body (11) inside is provided with inlet channel, the inner chamber of outlet passage and connection inlet channel and outlet passage, valve rod (3) outer surface is provided with screw thread, valve rod (3) is through the Stem Mut (12) at bonnet (6) top, valve rod (3) lower end is connected with plunger (8), plunger (8) stretches into valve body (11) inner chamber, the inner chamber top of valve body (11) is provided with upper sealing ring (7), rotate handwheel (2), valve rod (3) drives plunger (8) motion, be communicated with or cut-out valve body (11) inner chamber, it is characterized in that:
Described valve body (11) intracavity bottom is provided with circle platform (15), set gradually cage cover (9) and lower sealing ring (10) from upper sealing ring (7) to enclosing platform (15), upper sealing ring (7), cage cover (9), the internal diameter of lower sealing ring (10) and circle platform (15) all coincide with plunger (8) external diameter, cage cover (9) sidewall is provided with and connects cage cover (9) inner chamber, the through hole of valve body (11) inner chamber and outlet passage, it is upper along the distance to the lower edge of lower sealing ring (10) that the length of plunger (8) is greater than upper sealing ring (7).
2. piston type stop valve according to claim 1, is characterized in that, described upper sealing ring (7) and lower sealing ring (10) adopt 316 reinforced type flexible graphite seal rings.
3. piston type stop valve according to claim 1, is characterized in that, described valve rod (3) is connected by clip nut (13) with plunger (8).
4. piston type stop valve according to claim 3, is characterized in that, described valve rod (3) lower end and plunger (8) joint are provided with thrust pad (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420448099.7U CN204004475U (en) | 2014-08-08 | 2014-08-08 | A kind of piston type stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420448099.7U CN204004475U (en) | 2014-08-08 | 2014-08-08 | A kind of piston type stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204004475U true CN204004475U (en) | 2014-12-10 |
Family
ID=52044478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420448099.7U Expired - Fee Related CN204004475U (en) | 2014-08-08 | 2014-08-08 | A kind of piston type stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204004475U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626418A (en) * | 2017-03-21 | 2018-10-09 | 荣成市荣利阀门有限公司 | One kind is exempted to wash away sealing surface regulating valve |
-
2014
- 2014-08-08 CN CN201420448099.7U patent/CN204004475U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626418A (en) * | 2017-03-21 | 2018-10-09 | 荣成市荣利阀门有限公司 | One kind is exempted to wash away sealing surface regulating valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20190808 |