Low-leakage elastic pressure balance type regulating valve

Abstract

The utility model discloses a low-leakage elastic pressure balance type regulating valve which comprises a valve seat and a sleeve arranged at the top of the valve seat. A valve element assembly is arranged in the sleeve. The valve element assembly comprises a lower valve element arranged in the sleeve and a valve rod arranged in the lower valve element. An upper valve element gland is arranged at the top of the lower valve element, and the valve rod penetrates through the center of the upper valve element gland. An upper valve element is arranged on the outer side of the top of the lower valve element, an elastic assembly is arranged on the top of the upper valve element, and the top of the elastic assembly abuts against the bottom of the upper valve element gland. By using the graphite ring structure with pre-spring pressure load, enough sealing specific pressure can be ensured all the time, no leakage is realized, the valve element can be used in high-temperature and high-pressure occasions, the problem of sealing leakage of a traditional double-sealing valve element structure is solved, enough sealing force is provided through the first disc spring and the second disc spring, and the overall high-sealing-grade requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a low leakage elastic pressure balance type regulating valve. BACKGROUND

[0002] The valve structure for high temperature and high pressure occasions mainly has two kinds at present, one is the traditional valve core double sealing structure, the valve core upper sealing pair is composed of the valve core upper sealing surface and the sleeve sealing surface, the valve core lower sealing pair is composed of the valve core lower sealing surface and the valve seat sealing surface, and the height of the distance between the two sealing surfaces needs to be guaranteed to realize complete sealing, but since there is always machining deviation when parts are processed, and under high temperature and high pressure, the parts exist stress deformation and thermal expansion and cold shrinkage, so the valve cannot guarantee that both sealing surfaces can be subjected to sufficient sealing force to achieve complete sealing in theory. The other is the metal C type sealing ring which is commonly used at present, the metal C type sealing ring opening is downward, and the high pressure side is pressed, and elastic deformation is realized through assembly pre-pressing and medium pressure to realize sealing. The valve core upper sealing is realized by the elastic deformation of the metal C type pre-pressing and medium pressure to realize the sealing of the valve core and the sleeve. The valve core lower sealing pair is composed of the valve core lower sealing surface and the valve seat sealing surface. Although the C type sealing ring can have certain deformation, the height of the distance between the two sealing surfaces needs to be guaranteed to realize complete sealing, but since there is always machining deviation when parts are processed, and under high temperature and high pressure, the parts exist stress deformation and thermal expansion and cold shrinkage, the C type sealing ring still produces overpressure or insufficient pre-pressing, and damage and leakage are caused. At the same time, the metal C type sealing ring belongs to a thin-walled elastic element, and it is difficult to be applied to high temperature and high pressure occasions, and it is easy to cause damage due to insufficient strength, causing valve jamming and leakage. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a low leakage elastic pressure balance type regulating valve, which comprises a valve seat and a sleeve arranged on the top of the valve seat.

[0004] The sleeve is internally provided with a valve core assembly.

[0005] The valve core assembly comprises a lower valve core arranged in the sleeve and a valve rod arranged in the lower valve core.

[0006] The lower valve core is provided with an upper valve core gland at the top, and the valve rod penetrates the center position of the upper valve core gland.

[0007] The lower valve core is provided with an upper valve core at the outside of the top, the upper valve core is provided with an elastic assembly at the top, and the top of the elastic assembly abuts against the bottom of the upper valve core gland.

[0008] Preferably, a graphite ring is arranged between the upper valve core and the lower valve core, and the inner side of the graphite ring is attached to the outer wall of the lower valve core.

[0009] Preferably, the elastic assembly includes a first disc spring and a second disc spring, the first disc spring is arranged above the graphite ring, the second disc spring is arranged above the first disc spring, and the second disc spring is arranged at the bottom of the upper spool gland.

[0010] Preferably, a graphite gland is arranged between the first disc spring and the second disc spring.

[0011] Preferably, an upper sealing pair is arranged between the upper spool and the lower spool.

[0012] Preferably, a lower sealing pair is arranged between the sleeve and the valve seat.

[0013] Preferably, a sealing gasket is arranged outside the bottom of the valve seat.

[0014] Preferably, the sleeve is coaxial with the valve stem.

[0015] Compared with the prior art, the beneficial effects of the application are as follows:

[0016] The low-leakage elastic pressure balance type regulating valve provided by the application can always ensure sufficient sealing specific pressure and realize no leakage by using a graphite ring structure with a pre-spring pressure load, can be used in high-temperature and high-pressure occasions, solves the sealing leakage problem of a traditional double-sealing spool structure, provides sufficient sealing force by a disc spring, and realizes the overall high sealing level requirement. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced,

[0018] Obviously, the drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0019] Figure 1 The figure is a cross-sectional view of the low-leakage elastic pressure balance type regulating valve of the present application.

[0020] In the figure: 1, valve stem, 2, sleeve, 3, upper sealing pair, 4, lower sealing pair, 5, valve seat, 6, graphite ring, 7, upper spool, 8, first disc spring, 9, graphite gland, 10, second disc spring, 11, upper spool gland, 12, sealing gasket, 13, lower spool. DETAILED DESCRIPTION

[0021] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0023] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For the person skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0025] In addition, the terms "mounting", "setting", "providing", "connecting", "connecting", "sleeving" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For the person skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0026] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] Embodiment one

[0028] Figure 1 The utility model discloses a low leakage elastic pressure balance type regulating valve, include: valve seat 5 and set up in the top of valve seat 5's sleeve 2, sleeve 2 inside is provided with valve core subassembly, valve core subassembly includes the lower valve core 13 of setting in the inside of sleeve 2 and the valve stem 1 of setting in the inside of lower valve core 13, lower valve core 13 top is provided with upper valve core gland 11, and valve stem 1 penetrates the center position of upper valve core gland 11, lower valve core 13 top outside is provided with upper valve core 7, and upper valve core 7 top is provided with elastic assembly, and elastic assembly top bears to the bottom of upper valve core gland 11.

[0029] Specifically, when assembling the valve core assembly, first, the graphite ring 6 is compressed by rotating the graphite gland 9 to adjust the compression amount of the disc spring 1, and the pre-tightening force of the graphite ring 6 is loaded by the elastic assembly, which can always ensure sufficient sealing specific pressure and achieve no leakage. By rotating the upper valve core gland 11 to compress the second disc spring 10, the upper valve core 7 is in complete contact with the valve core, and at this time, the second disc spring 10 has appropriate pre-compression elastic force.

[0030] According to the embodiment of the utility model, the graphite ring 6 is arranged between the upper valve core 7 and the lower valve core 13, and the inner side of the graphite ring 6 is attached to the outer wall of the lower valve core 13.

[0031] According to the embodiment of the utility model, the elastic assembly includes the first disc spring 8 and the second disc spring 10, the first disc spring 8 is arranged above the graphite ring 6, the second disc spring 10 is arranged above the first disc spring 8, and the second disc spring 10 is arranged at the bottom of the upper valve core gland 11.

[0032] According to the embodiment of the utility model, the graphite gland 9 is arranged between the first disc spring 8 and the second disc spring 10.

[0033] According to the embodiment of the utility model, the upper sealing pair 3 is arranged between the upper valve core 7 and the lower valve core 13.

[0034] According to the embodiment of the utility model, the lower sealing pair 4 is arranged between the sleeve 2 and the valve seat 5.

[0035] According to the embodiment of the utility model, the sealing gasket 12 is arranged at the outer side of the bottom of the valve seat 5.

[0036] According to the embodiment of the utility model, the sleeve 2 and the valve stem 1 are coaxially arranged.

[0037] Specifically, the valve core assembly is installed into the sleeve 2, and the upper valve core 7 sealing surface first contacts the sleeve 2 sealing surface under the condition that the valve stem 1 is not subjected to external force, at which time the lower valve core sealing pair 4 is in a suspended state without being contacted. At this time, the valve stem 1 is pushed by the actuator, and a downward pushing force is given, and since the upper valve core 7 is elastically floating, it can be ensured that the lower valve core sealing pair 4 is completely contacted and sealed, and when the valve core moves downward, the upper valve core 7 is forced to seal with the sleeve 2 through the second disc spring 10.

[0038] In summary, the low-leakage elastic pressure balance type regulating valve of the present application can always ensure sufficient sealing specific pressure and realize no leakage by using the graphite ring 6 structure with a pre-spring pressure load, can be used in high-temperature and high-pressure occasions, solves the sealing leakage problem of the traditional double-sealing valve core structure, and provides sufficient sealing force through the first disc spring 8 and the second disc spring 10, and realizes the overall high sealing level requirement.

[0039] Finally, it should be noted that the above is only the preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A low-leakage, resilient pressure balanced control valve, comprising: The valve seat and the sleeve arranged on the top of the valve seat; characterized in that, The sleeve is internally provided with a valve core assembly; The valve core assembly comprises a lower valve core arranged in the sleeve and a valve rod arranged in the lower valve core; The top of the lower valve core is provided with an upper valve core gland, and the valve rod penetrates the center of the upper valve core gland; The outside of the top of the lower valve core is provided with an upper valve core, the top of the upper valve core is provided with an elastic assembly, and the top of the elastic assembly abuts against the bottom of the upper valve core gland; A graphite ring is arranged between the upper valve core and the lower valve core, and the inner side of the graphite ring is attached to the outer wall of the lower valve core; The elastic assembly comprises a first disc spring and a second disc spring, the first disc spring is arranged above the graphite ring, the second disc spring is arranged above the first disc spring, and the second disc spring is arranged at the bottom of the upper valve core gland.

2. A low-leakage, resilient pressure balanced regulator valve as defined in claim 1, wherein, A graphite gland is arranged between the first disc spring and the second disc spring.

3. A low-leakage, resilient pressure balanced regulator valve as defined in claim 1, wherein, An upper sealing pair is arranged between the upper valve core and the lower valve core.

4. A low-leakage, resilient pressure balanced regulator valve as defined in claim 1, wherein, A lower sealing pair is arranged between the sleeve and the valve seat.

5. A low leakage, resilient pressure balanced control valve as defined in claim 1 wherein, A sealing gasket is arranged outside the bottom of the valve seat.

6. A low leakage, resilient pressure balanced control valve as defined in claim 1 wherein, The sleeve and the valve rod are coaxially arranged.

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