High-sealing flange butterfly valve

Abstract

The utility model relates to the field of butterfly valves, in particular to a high-sealing flange butterfly valve. The technical problem to be solved by the utility model is to provide the high-sealing flange butterfly valve which can effectively compensate long-term abrasion of a sealing surface, recover and maintain required sealing specific pressure, remarkably improve the sealing reliability of the valve and prolong the overall service life of the valve. A high-sealing flange butterfly valve comprises a valve body. The valve rod is rotationally mounted in the valve body; the butterfly plate is arranged in the water through hole of the valve body and is fixedly connected with the valve rod through a pin; and an adjustable sealing seat fixedly connected with the valve body is also arranged on one side of the butterfly plate in the water through hole of the valve body. According to the utility model, the effects of effectively compensating the long-term abrasion of the sealing surface, recovering and maintaining the required sealing specific pressure, obviously improving the sealing reliability of the valve and prolonging the overall service life of the valve are achieved.

Description

Technical Field

[0001] This utility model relates to the field of high sealing flange butterfly valve. Background Technology

[0002] Butterfly valves, as a type of control valve with a simple structure and wide application, play a vital role in industrial pipeline systems. They are mainly used for the shut-off and throttling control of various fluids. However, under the condition of frequent opening and closing, existing butterfly valves inevitably experience continuous friction and wear between the butterfly plate and the valve seat sealing surface. This wear will intensify with the extension of the service time, directly leading to a decrease in sealing effect, which in turn causes media leakage problems, seriously affecting the sealing reliability and service life of the valve.

[0003] To address this challenge, the industry has proposed several improvement solutions. For example, prior art document (CN215861775U) discloses a structure using a movable sealing ring in conjunction with a spring. Its core principle is to use the preload continuously applied by the spring to push the sealing surface of the movable sealing ring to fit tightly against the relatively fixed sealing surface of the pressure ring, thereby achieving an initial reliable seal. At the same time, the spring design also provides a wear compensation mechanism. When the sealing surface experiences a certain degree of wear after long-term use, the spring can continue to push the movable sealing ring forward to compensate for the wear gap and maintain a tight fit between the sealing surfaces.

[0004] However, this existing technical solution still has significant limitations. After prolonged use, the spring continuously pushes the movable sealing ring forward, and the spring pressure is continuously released, causing the applied preload to gradually decrease. Once the spring's thrust on the movable sealing ring towards the pressure ring weakens to a certain extent, it can no longer effectively compensate for further wear of the sealing surface or maintain the necessary sealing pressure. At this point, the tight fit between the sealing pairs is destroyed, the sealing force decreases significantly, and eventually, media leakage will occur again. Therefore, it is urgent to develop a high-sealing flange butterfly valve that can effectively compensate for long-term wear of the sealing surface, restore and maintain the required sealing pressure, and significantly improve the valve's sealing reliability and overall service life. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, where the pressure of the spring is continuously released after prolonged use, resulting in a gradual decrease in the applied preload and a significant reduction in the sealing effect, this utility model aims to provide a high-sealing flange butterfly valve that can effectively compensate for long-term wear of the sealing surface, restore and maintain the required sealing specific pressure, and significantly improve the sealing reliability and overall service life of the valve.

[0006] This utility model is achieved by the following specific technical means:

[0007] A high-sealing flange butterfly valve includes a valve body; a support frame fixedly connected to the upper end of the valve body; a worm gear rotator fixedly connected to the support frame; a handwheel fixedly connected to the input shaft of the worm gear rotator; a valve stem rotatably mounted in the valve body and connected to the output shaft of the worm gear rotator; a butterfly plate disposed in the water passage hole of the valve body and fixedly connected to the valve stem by a pin; and an adjustable sealing seat fixedly connected to the valve body is also disposed on one side of the butterfly plate disposed in the water passage hole of the valve body.

[0008] The butterfly plate includes a plate body that is fixedly connected to the valve stem. A pressure ring is fixedly connected to the side of the plate body near the adjustable sealing seat by bolts. A sealing gasket is also fixedly provided between the pressure ring and the plate body.

[0009] The adjustable sealing seat includes a fixed sleeve located in the water passage hole of the valve body near the pressure ring and fixedly connected to the valve body by bolts; a sliding groove is provided on the end face of the fixed sleeve near the pressure ring, and a plurality of threaded holes are evenly spaced and arranged in a ring on the end face of the fixed sleeve away from the pressure ring, which pass through the fixed sleeve and communicate with the sliding groove; a sealing seat ring is slidably arranged on the side of the fixed sleeve near the pressure ring; a sliding sleeve protrudes from the end of the sealing seat ring near the fixed sleeve and extends into the sliding groove of the fixed sleeve; a spring is also provided in the sliding groove of the fixed sleeve; and adjusting studs are respectively engaged in the plurality of threaded holes of the fixed sleeve.

[0010] Furthermore, a sealing ring is provided at the sliding engagement point between the sliding sleeve of the sealing seat and the sliding groove of the fixed sleeve to prevent liquid medium from leaking from the sliding engagement point between the sliding sleeve and the sliding groove of the sealing seat into the sliding groove.

[0011] Furthermore, the sealing surfaces of the pressure ring and the sealing seat ring are mutually matched conical sealing surfaces; this increases the sealing effect of the sealing surfaces, giving them a certain degree of self-sealing, and making the seal more reliable.

[0012] Furthermore, the sliding sleeve of the sealing seat ring and the sliding groove of the fixed sleeve are fitted with a clearance; this allows the sliding sleeve of the sealing seat ring to slide smoothly, ensuring that the sealing surfaces of the sealing seat ring and the pressure ring are tightly fitted.

[0013] Furthermore, at least four adjusting studs are provided; one end of the adjusting stud extends through into the sliding groove of the fixed sleeve and abuts against one end of the spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention effectively compensates for long-term wear of the sealing surface, restores and maintains the required sealing specific pressure, and significantly improves the sealing reliability and overall service life of the valve. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3 This is a partial cross-sectional view of the present invention.

[0019] Figure 4 This is a partial cross-sectional view of the fixing sleeve of this utility model.

[0020] The markings in the attached diagram are as follows: 1-valve body, 2-support frame, 3-worm gear rotator, 4-handwheel, 5-valve stem, 6-disc plate, 7-pin, 8-adjustable sealing seat, 61-plate, 62-pressure ring, 63-sealing gasket, 81-fixed sleeve, 82-sealing seat ring, 83-spring, 84-adjusting stud. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings: Example

[0022] A high-sealing flange butterfly valve, such as Figure 1-4 As shown, it includes a valve body 1; a support frame 2 fixedly connected to the upper end of the valve body 1; a worm gear rotator 3 fixedly connected to the support frame 2; a handwheel 4 fixedly connected to the input shaft of the worm gear rotator 3; a valve stem 5 rotatably installed inside the valve body 1 and connected to the output shaft of the worm gear rotator 3; a butterfly plate disposed in the water passage hole of the valve body 1 and fixedly connected to the valve stem 5 by a pin 7; and an adjustable sealing seat 8 fixedly connected to the valve body 1 is also disposed on one side of the butterfly plate disposed in the water passage hole of the valve body 1.

[0023] The butterfly plate includes a plate body 61 fixedly connected to the valve stem 5. A pressure ring 62 is fixedly connected to the side of the plate body 61 near the adjustable sealing seat 8 by bolts. A sealing gasket 63 is also fixedly provided between the pressure ring 62 and the plate body 61.

[0024] The adjustable sealing seat 8 includes a fixed sleeve 81 located in the water passage hole of the valve body 1 near the pressure ring 62 and fixedly connected to the valve body 1 by bolts; a sliding groove is provided on the end face of the fixed sleeve 81 near the pressure ring 62, and a plurality of threaded holes are provided evenly and uniformly in a ring on the end face of the fixed sleeve 81 away from the pressure ring 62, which are connected to the sliding groove through the fixed sleeve 81; a sealing seat ring 82 is slidably provided on the side of the fixed sleeve 81 near the pressure ring 62; a sliding sleeve is provided protruding from the end of the sealing seat ring 82 near the fixed sleeve 81 and extending into the sliding groove of the fixed sleeve 81; a spring 83 is also provided in the sliding groove of the fixed sleeve 81; and adjusting studs 84 are respectively engaged in the plurality of threaded holes of the fixed sleeve 81.

[0025] Working principle:

[0026] This utility model butterfly valve drives the worm gear rotator 3 by rotating the handwheel 4, which in turn drives the valve stem 5 and the butterfly plate fixed to it by the pin 7 to rotate about 90 degrees within the water passage hole of the valve body 1, thereby realizing the opening and closing of the valve. When the valve is closed, the pressure ring 62 on the butterfly plate contacts the sealing seat ring 82 of the adjustable sealing seat 8. The contact surfaces of the pressure ring 62 and the sealing seat ring 82 are mutually matched conical sealing surfaces. The conical sealing surface not only provides initial sealing contact, but also has self-sealing properties: when the medium pressure acts on the closed butterfly plate, the pressure will push the pressure ring 62 to press more tightly against the sealing seat ring 82, significantly enhancing the sealing effect.

[0027] Meanwhile, a spring 83 is installed in the sliding groove of the fixed sleeve 81. One end of the spring 83 abuts against the bottom of the sliding groove, and the other end acts on the sliding end face of the sealing seat ring 82. The spring 83 provides a preload force, which pushes the sealing seat ring 82 towards the pressure ring 62 when the valve is closed, ensuring sealing contact. At the same time, an adjusting stud 84 is also provided in the threaded hole of the fixed sleeve 81. Its inner end extends into the sliding groove and abuts against the other end of the spring 83. When the sealing surface wears down due to long-term use, resulting in a decrease in sealing force, the spring 83 can be compressed by evenly tightening the multiple adjusting studs 84 distributed in a ring on the fixed sleeve 81, thereby increasing the thrust on the sealing seat ring 82, pushing it towards the pressure ring 62, compensating for wear, restoring the required sealing specific pressure, ensuring the sealing reliability when the valve is closed, and significantly extending the sealing effect and service life of the valve.

[0028] Meanwhile, a sealing ring is provided between the sliding sleeve of the sealing seat ring 82 and the sliding groove of the fixed sleeve 81, which effectively prevents the liquid medium in the pipeline from leaking into the sliding groove from the sliding fit, and protects the spring 83 and the adjusting mechanism from the corrosion of the medium; the sliding sleeve and the sliding groove adopt a clearance fit to ensure that the sealing seat ring 82 can slide smoothly under the force of the spring 83 and the action of the adjusting screw 84, so that its conical sealing surface can always flexibly and tightly fit the conical surface of the pressure ring 62.

[0029] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.

Claims

1. A high-sealing flange butterfly valve, characterized in that, The valve body includes a valve body (1); a support frame (2) fixedly connected to the upper end of the valve body (1); a worm gear rotator (3) fixedly connected to the support frame (2); a handwheel (4) fixedly connected to the input shaft of the worm gear rotator (3); a valve stem (5) rotatably installed inside the valve body (1) and connected to the output shaft of the worm gear rotator (3); a butterfly plate fixedly connected to the valve stem (5) by a pin (7) inside the water passage hole of the valve body (1); and an adjustable sealing seat (8) fixedly connected to the valve body (1) on one side of the butterfly plate inside the water passage hole of the valve body (1). The butterfly plate includes a plate body (61) fixedly connected to the valve stem (5). A pressure ring (62) is fixedly connected to the side of the plate body (61) near the adjustable sealing seat (8) by bolts. A sealing gasket (63) is also fixedly provided between the pressure ring (62) and the plate body (61). The adjustable sealing seat (8) includes a fixed sleeve (81) located in the water passage hole of the valve body (1) near the pressure ring (62) and fixedly connected to the valve body (1) by bolts; a sliding groove is provided on the end face of the fixed sleeve (81) near the pressure ring (62), and a plurality of threaded holes are provided evenly and uniformly in a ring on the end face of the fixed sleeve (81) away from the pressure ring (62), which are connected to the sliding groove through the fixed sleeve (81); a sealing seat ring (82) is slidably provided on the side of the fixed sleeve (81) near the pressure ring (62); a sliding sleeve is provided at the end of the sealing seat ring (82) near the fixed sleeve (81), extending into the sliding groove of the fixed sleeve (81); a spring (83) is also provided in the sliding groove of the fixed sleeve (81); and an adjusting stud (84) is respectively engaged in the plurality of threaded holes of the fixed sleeve (81).

2. The high-sealing flange butterfly valve according to claim 1, characterized in that, A sealing ring is provided at the sliding joint between the sliding sleeve of the sealing seat (82) and the sliding groove of the fixed sleeve (81).

3. The high-sealing flange butterfly valve according to claim 1, characterized in that, The sealing surfaces of the pressure ring (62) and the sealing seat ring (82) are mutually matched conical sealing surfaces.

4. A high-sealing flange butterfly valve according to claim 1, characterized in that, The sliding sleeve of the sealing seat (82) and the sliding groove of the fixed sleeve (81) are fitted with a clearance.

5. A high-sealing flange butterfly valve according to claim 1, characterized in that, At least four adjusting studs (84) are provided.

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