一种三偏心蝶阀
By incorporating a spring and retaining ring structure in the triple eccentric butterfly valve, continuous stress is provided, solving the problem of valve seat and bolt loosening, achieving sealing stability and equipment reliability, and making it suitable for petrochemical, building HVAC, and water conservancy and hydropower industries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KAIFENG HIGH & MEDIUM PRESSURE VALVE CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-07-17
AI Technical Summary
In existing triple eccentric butterfly valves, the valve seat and set bolt are prone to detachment under reverse medium action, resulting in poor sealing. Long-term use will cause the set bolt to loosen, leading to equipment failure.
The valve seat is equipped with first and second blind holes, first and second springs are installed, and a retaining ring and screws are combined. The springs provide continuous stress to prevent the screws from loosening. An O-ring is placed between the sealing ring and the butterfly plate to reduce the gap. The gap between the valve seat and the valve body is reduced by using sealing packing made of braided graphite.
It effectively prevents valve seat misalignment and screw loosening, improves the reverse sealing performance of the butterfly valve, and ensures the stability of the seal and the reliability of the equipment.
Smart Images
Figure CN224515971U_ABST
Abstract
Claims
1. A triple offset butterfly valve comprising a valve body (1) provided with a medium passage (2) therethrough, characterized in that: The medium passes through a channel (2) and a valve seat (3) is provided therein. A first blind hole (4) is provided on the valve body (1) on one side of the valve seat (3). A first spring (5) is provided on the first blind hole (4) and the valve seat (3). A valve seat pressure ring (6) is provided in the valve body (1) on the side of the valve seat (3) away from the first blind hole (4). A second blind hole (7) is provided on the end of the valve seat pressure ring (6) facing the valve seat (3). A second spring (8) is provided on the second blind hole (7) and the valve seat (3). A fixing ring (9) is provided on the side of the seat pressure ring (6) away from the valve seat (3). A first screw (10) is provided on the fixing ring (9). The first screw (10) abuts against the valve seat pressure ring (6). A valve stem (11) is provided on the valve body (1). A butterfly plate (12) is provided on the valve stem (11). A butterfly plate pressure ring (13) is provided on the butterfly plate (12). A sealing ring (14) is provided between the butterfly plate (12) and the butterfly plate pressure ring (13). The sealing ring (14) fits against the valve seat (3).
2. The triple offset butterfly valve according to claim 1, wherein: The fixing ring (9) adopts a stepped ring structure composed of several arc plates connected end to end. The valve body (1) is provided with a first limiting groove (15). The shape of the fixing ring (9) matches the shape of the first limiting groove (15). The number of the first blind hole (4), the second blind hole (7) and the first screw (10) are all several. The several first blind holes (4), the several second blind holes (7) and the several first screws (10) are evenly distributed in a star shape on the outside of the central axis of the medium passage (2). The central axis of the medium passage (2), the central axis of the fixing ring (9), the central axis of the valve seat (3) and the central axis of the valve seat pressure ring (6) are located on the same axis. A first spring (5) is installed on each first blind hole (4) and a second spring (8) is installed on each second blind hole (7).
3. The triple offset butterfly valve of claim 1, wherein: The valve body (1) is provided with a valve stem passage hole (16), and the valve stem (11) is installed on the valve stem passage hole (16). The central axis of the valve stem passage hole (16) is perpendicular to the central axis of the medium passage channel (2). A second limiting groove (17) is provided on the bottom of the valve stem (11). A split ring (18) is provided on the second limiting groove (17). The split ring (18) is a ring structure composed of two arc-shaped plate structures connected end to end in sequence. The split ring (18) is movably connected to the valve body (1). A plug (19) is provided on the bottom of the valve stem passage hole (16).
4. The triple offset butterfly valve according to claim 3, wherein: A base flange (20) is provided below the plug (19), and a second bolt (21) is provided on the base flange (20) and the valve body (1). The plug (19) adopts a stepped cylindrical structure composed of a small end and a large end provided below the small end. The shape of the bottom of the valve stem through hole (16) matches the shape of the plug (19). A first O-ring gasket (22) is provided between the large end of the plug (19) and the valve stem through hole (16).
5. The triple eccentric butterfly valve according to claim 3, characterized in that: A packing seal groove (23) is provided on the valve body (1) above the valve stem through hole (16). The packing seal groove (23) is provided with a packing gasket (24), a first sealing packing (25), and a packing pressure ring (26) in sequence along the direction from near the valve stem through hole (16) to away from the valve stem through hole (16). The packing gasket (24), the first sealing packing (25), and the packing pressure ring (26) are all ring-shaped structures. The packing gasket (24), the first sealing packing (25), and the packing pressure ring (26) are all ring-shaped structures. The sealing packing (25) and the packing ring (26) are both fitted on the valve body (1). A packing pressure plate (27) is provided on the valve stem (11) above the packing ring (26). A fixing screw (28) is provided on the packing pressure plate (27) and the valve body (1). An adjusting nut (29) is provided on the fixing screw (28) above the packing pressure plate (27). A disc spring (30) is provided on the fixing screw (28) between the adjusting nut (29) and the packing pressure plate (27).
6. The triple eccentric butterfly valve according to claim 5, characterized in that: The central axis of the packing sealing groove (23), the central axis of the valve stem through hole (16) and the central axis of the valve stem (11) are located on the same axis. The number of fixing screws (28) is several. The several fixing screws (28) are evenly distributed in a star shape on the outside of the central axis of the valve stem (11). Each fixing screw (28) is equipped with an adjusting nut (29) and a disc spring (30). Each fixing screw (28) is also provided with a driving block (31) on its top. The driving block (31) adopts a multi-prism structure.
7. The triple offset butterfly valve of claim 1, wherein: A second O-ring gasket (32) is provided between the sealing ring (14) and the butterfly plate (12). The first spring (5) and the second spring (8) are located on both sides of the valve seat (3). A second sealing packing (33) is provided on the valve seat (3) between the first spring (5) and the second spring (8). The second sealing packing (33) adopts a ring structure made of woven graphite. A second screw (34) is provided on the butterfly plate pressure ring (13) and the butterfly plate (12). The number of the second screws (34) is several. The several second screws (34) are evenly distributed in a star shape on the outside of the central axis of the medium passage (2).