CN214999627U - Backpressure balanced type relief valve - Google Patents
Backpressure balanced type relief valve Download PDFInfo
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- CN214999627U CN214999627U CN202120445747.3U CN202120445747U CN214999627U CN 214999627 U CN214999627 U CN 214999627U CN 202120445747 U CN202120445747 U CN 202120445747U CN 214999627 U CN214999627 U CN 214999627U
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- valve
- guide sleeve
- recoil
- back pressure
- disc
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Abstract
The utility model provides a backpressure balanced type safety valve, which comprises a valve body, a valve cover, a valve cap, a valve core, a recoil disc, a guide sleeve and a valve rod, wherein the valve body, the valve cover and the valve cap are sequentially connected to form a valve cavity; the guide sleeve is clamped between the valve body and the valve cover, and the upper end of the recoil disc extends into the central through hole of the guide sleeve to be in sliding connection with the guide sleeve and in sealing fit with the guide sleeve; when the valve is closed, the valve core is in sealing fit with the top end of a valve seat arranged in the valve body, and the maximum diameter of the contact surface of the valve core and a medium is equal to the outer diameter of the upper end of the recoil disc. The utility model discloses the recoil dish upper end that sets up and the central through-hole sliding connection and the sealed cooperation of uide bushing to the external diameter of recoil dish upper end equals the maximum diameter of case and medium contact surface, makes the backpressure that receives about the recoil dish lower extreme equal and then offset each other, keeps the invariable of relief valve setting pressure, has reduced the processing degree of difficulty and the manufacturing cost of valve.
Description
Technical Field
The utility model relates to the technical field of valves, concretely relates to backpressure balanced type relief valve.
Background
The safety valve is a special valve, wherein the opening and closing part is in a normally closed state under the action of external force, and when the pressure of a medium in equipment or a pipeline rises to exceed a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or the equipment from exceeding the specified value.
The setting pressure of a common safety valve is influenced by back pressure, when the additional back pressure acts on the outlet of the spring-loaded pressure relief valve, the pressure acts on a valve clack (namely a valve core) as the additional force of a spring, and the additional force increases the opening pressure of the unbalanced pressure relief valve. If the additional back pressure is varied, the pressure at which the valve opens will also vary. Although the existing back pressure balance bellows type safety valve solves the problems and has reliable performance, the existing back pressure balance bellows type safety valve also has the defects of higher welding difficulty of the bellows, more complex valve structure, higher overall manufacturing cost, difficult later maintenance and the like, and is not ideal when being used under the working condition with low requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough to prior art, the utility model aims at providing a backpressure balanced type relief valve, the center through-hole sliding connection and the sealed cooperation of recoil dish upper end and uide bushing to the external diameter of recoil dish upper end equals the maximum diameter of case and medium contact surface, makes the backpressure that receives about the recoil dish lower extreme equal and then offset each other, keeps the invariable of the pressure of setting of relief valve, has reduced the processing degree of difficulty and the manufacturing cost of valve, and the structure can be simplified and make later maintenance easier.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a back pressure balanced relief valve comprising:
a valve body;
a valve cover;
a bonnet;
a valve core;
a kick plate;
a guide sleeve; and
a valve stem;
the valve body, the valve cover and the valve cap are sequentially connected to form a valve cavity, and the valve core, the recoil disc and the valve rod are sequentially arranged in the valve cavity; the guide sleeve is clamped between the valve body and the valve cover, and the upper end of the recoil disc extends into the central through hole of the guide sleeve to be in sliding connection with the guide sleeve and in sealing fit with the guide sleeve; when the valve is closed, the valve core is in sealing fit with the top end of a valve seat arranged in the valve body, and the maximum diameter of the contact surface of the valve core and a medium is equal to the outer diameter of the upper end of the recoil disc.
In one embodiment of the present disclosure, the upper end of the recoil disc is in sliding sealing fit with the central through hole of the guide sleeve through an O-ring.
In one embodiment disclosed in the application, an upper O-ring and a lower O-ring are arranged between the upper end of the recoil disc and the central through hole of the guide sleeve.
In an embodiment of the present disclosure, a first annular groove is formed in an outer side wall of an upper end of the kick plate, a second annular groove is formed in an inner side wall of a central through hole of the guide sleeve, and the O-rings are respectively installed in the first annular groove and the second annular groove.
In one embodiment of the present disclosure, the first annular groove is located above the second annular groove.
In one embodiment of the present disclosure, the lower end of the valve rod is inserted into the inner portion of the upper end of the recoil disc and is in interference connection with a buffer block disposed in the inner portion of the upper end of the recoil disc.
In an embodiment disclosed in the present application, the lower end of the valve rod is of a conical structure, and the top surface of the buffer block is concave and is of a conical sinking structure.
In one embodiment disclosed in the present application, an apex angle of the cone at the lower end of the valve rod is smaller than an apex angle of the cone at which the top surface of the buffer block is concave.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the upper end of the set back flushing disc is in sliding connection and sealing fit with the central through hole of the guide sleeve, and the outer diameter of the upper end of the back flushing disc is equal to the maximum diameter of the contact surface of the valve core and the medium, so that the back pressures applied to the upper surface and the lower surface of the lower end of the back flushing disc are equal and offset with each other, the constant setting pressure of the safety valve is kept, and the processing difficulty and the manufacturing cost of the valve are reduced;
2. compared with a corrugated pipe, the back-flushing disc and the guide sleeve are sealed through the O-shaped ring, the structure is simplified, the sealing is reliable under medium and low pressure, the O-shaped ring is low in cost, easy to replace and more convenient to maintain at a later stage;
3. the upper O-shaped ring and the lower O-shaped ring are respectively arranged in the first annular groove and the second annular groove, and two different and staggered sealing surfaces are formed on the recoil disc and the guide sleeve, so that the sealing effect is enhanced;
4. set up the buffer block in that the recoil dish upper end is inside to make the valve rod lower extreme insert the inside conflict with the buffer block in recoil dish upper end and be connected, when the relief valve was opened and close, can reduce through the buffer block and strike, play the effect of protection recoil dish and valve rod.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the main section structure of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
fig. 3 is a schematic diagram of a force analysis of the valve core.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1-3, the utility model provides a backpressure balanced type relief valve, include:
a valve body 1;
a valve cover 2;
a valve cap 3;
a valve core 4;
a recoil plate 5;
a guide sleeve 6; and
a valve stem 7;
the valve body 1, the valve cover 2 and the valve cap 3 are sequentially connected to form a valve cavity, and the valve core 4, the recoil disc 5 and the valve rod 7 are sequentially arranged in the valve cavity; the guide sleeve 6 is clamped between the valve body 1 and the valve cover 2, and the upper end of the recoil disc 5 extends into a central through hole of the guide sleeve 6 to be in sliding connection with the guide sleeve and in sealing fit with the guide sleeve; when the valve is closed, the valve core 4 is in sealing fit with the top end of a valve seat 11 arranged in the valve body 1, and the maximum diameter of the contact surface of the valve core and a medium is equal to the outer diameter of the upper end of the recoil disc 5.
In particular, the valve cartridge 4 is integral with the recoil disc 5 and its upper end is subjected to a spring force F transmitted by a spring 8 through the stem 7SThe lower end is subjected to medium force FVSimultaneously, the upper and lower surfaces of the lower end of the recoil disc 5 are required to bear back pressure PBSee fig. 3 for details. In the processing and manufacturing process, the outer diameter of the upper end of the recoil disc 5 is equal to the maximum diameter of the contact surface of the valve core 4 and the medium, so that the recoil disc 5 is not backedThe area of the pressure (the upper end of the recoil disc 5 extends into the central through hole of the guide sleeve 6 so as not to be influenced by the back pressure) is approximately equal to the sealing area of the valve core 4, namely the upper surface and the lower surface of the lower end of the recoil disc 5 are influenced by the back pressure PBEqual, i.e. P as shown in FIG. 3BThe back pressure effect is mutually counteracted; the outlet 21 of the valve cover 2 is opened, so that the air pressure in the valve cover 2 is constantly equal to the atmospheric pressure, and the valve core 4 and the recoil disc 5 are only subjected to the medium force FVAnd spring force FSSo that the setting pressure of the safety valve is not influenced by the back pressure PBThe influence of (c) remains constant. Namely, the upper end of the set back-flushing disc 5 is in sliding connection and sealing fit with the central through hole of the guide sleeve 6, and the outer diameter size of the upper end of the back-flushing disc 5 is processed into the maximum diameter size of the contact surface between the valve core 4 and the medium, so that the back pressures on the upper surface and the lower surface of the lower end of the back-flushing disc are equal and offset with each other, the constant setting pressure of the safety valve is kept, and the processing difficulty and the manufacturing cost of the valve are reduced.
The upper end and the lower end of the spring 8 are both connected with a spring seat 9, the spring 8 and the spring seat 9 are respectively sleeved on the valve rod 7, the pretightening force of the spring 8 (namely the setting pressure of the safety valve) is adjusted through an adjusting threaded sleeve 10 in threaded connection with the upper end of the valve cover 2, the specific structure of the adjusting threaded sleeve is the same as that of the prior art, and the details are omitted here.
Referring to fig. 1 and 2, the upper end of the recoil disc 5 is in sliding sealing fit with the central through hole of the guide sleeve 6 through an O-ring. Compare in the bellows, the recoil dish 5 seals through O type circle with uide bushing 6, and the structure can be simplified, and under well low pressure, it is sealed equally reliable, and O type circle is with low costs moreover, and the replacement is easy, and later maintenance is more convenient.
In this embodiment, two O type circles about being equipped with between the central through-hole of recoil dish 5 upper end and uide bushing 6, can form twice sealedly, strengthened sealed effect.
Specifically, a first annular groove 51 is formed in the outer side wall of the upper end of the recoil disc 5, a second annular groove 61 is formed in the inner side wall of the central through hole of the guide sleeve 6, and the O-shaped rings are respectively installed in the first annular groove 51 and the second annular groove 61. Referring to fig. 2, the first annular groove 51 is located above the second annular groove 61. Namely, the upper O-shaped ring and the lower O-shaped ring respectively form two different and staggered sealing surfaces on the recoil disc 5 and the guide sleeve 6, so that the sealing effect is further enhanced.
The lower end of the valve rod 7 is inserted into the upper end of the recoil disc 5 and is in interference connection with a buffer block 52 arranged in the upper end of the recoil disc 5. When the safety valve is opened and closed, the impact can be reduced through the buffer block 52, and the function of protecting the recoil disc 5 and the valve rod 7 is achieved.
Referring to fig. 2, the lower end of the valve rod 7 is in a conical structure, and the top surface of the buffer block 52 is concave and in a conical sinking structure. Specifically, during machining, the lower end of the valve rod 7 and the top surface of the buffer block 52 are respectively machined into the structural form after being filled by electric welding. In the embodiment, the conical vertex angle of the lower end of the valve rod 7 is smaller than the conical vertex angle of the concave top surface of the buffer block 52; in this manner, the lower end of the valve stem 7 may be received by the top surface of the bumper 52 even after wear with use.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.
Claims (8)
1. A back pressure balanced relief valve comprising:
a valve body;
a valve cover;
a bonnet;
a valve core;
a kick plate;
a guide sleeve; and
a valve stem;
the valve body, the valve cover and the valve cap are sequentially connected to form a valve cavity, and the valve core, the recoil disc and the valve rod are sequentially arranged in the valve cavity; the guide sleeve is clamped between the valve body and the valve cover, and the upper end of the recoil disc extends into the central through hole of the guide sleeve to be in sliding connection with the guide sleeve and in sealing fit with the guide sleeve; when the valve is closed, the valve core is in sealing fit with the top end of a valve seat arranged in the valve body, and the maximum diameter of the contact surface of the valve core and a medium is equal to the outer diameter of the upper end of the recoil disc.
2. The back pressure balanced relief valve of claim 1, wherein the upper end of the recoil disc is in sliding sealing engagement with the central throughbore of the guide sleeve via an O-ring.
3. The back pressure balanced relief valve of claim 2, wherein two upper and lower O-rings are disposed between the upper end of the recoil disc and the central through hole of the guide sleeve.
4. The back pressure balanced type safety valve according to claim 3, wherein a first annular groove is formed in an outer side wall of an upper end of the recoil disc, a second annular groove is formed in an inner side wall of the central through hole of the guide sleeve, and the O-rings are respectively installed in the first annular groove and the second annular groove.
5. The back pressure balanced relief valve of claim 4, wherein the first annular groove is located above the second annular groove.
6. The back pressure balanced safety valve according to any one of claims 1 to 5, wherein a lower end of the valve stem is inserted into an inner portion of an upper end of the recoil disc and is in interference connection with a buffer block disposed in the inner portion of the upper end of the recoil disc.
7. The back pressure balanced safety valve of claim 6 wherein the lower end of the valve stem is tapered and the top surface of the bumper is concave and tapered.
8. The back pressure balanced safety valve of claim 7, wherein the apex angle of the cone at the lower end of the valve stem is smaller than the apex angle of the cone recessed into the top surface of the bumper block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120445747.3U CN214999627U (en) | 2021-03-02 | 2021-03-02 | Backpressure balanced type relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120445747.3U CN214999627U (en) | 2021-03-02 | 2021-03-02 | Backpressure balanced type relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214999627U true CN214999627U (en) | 2021-12-03 |
Family
ID=79158949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120445747.3U Active CN214999627U (en) | 2021-03-02 | 2021-03-02 | Backpressure balanced type relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214999627U (en) |
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2021
- 2021-03-02 CN CN202120445747.3U patent/CN214999627U/en active Active
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