An online removable double-seal stop valve seat structure

Abstract

The invention discloses an online detachable double-seal stop valve seat structure, comprising a valve body, a transfer groove is provided in the valve body, a transfer gasket is provided in the transfer groove, a valve seat is provided on the top of the transfer gasket disc, a cage sleeve is installed on the valve seat, a valve stem assembly is installed in the cage sleeve, a flange groove is provided in the valve body, a middle flange gasket is fixed in the flange groove, the middle flange gasket is assembled on the top of the cage sleeve, a valve cover is provided on the top of the middle flange assembly, the valve cover is fixed in the valve body by symmetrical positioning bolts, the positioning bolts are threadedly connected in the valve body, comprising a valve body, a transfer groove is provided in the valve body, a transfer gasket is provided in the transfer groove, a valve seat is provided on the top of the transfer gasket disc, a cage sleeve is installed on the valve seat, a valve stem assembly is installed in the cage sleeve, a flange groove is provided in the valve body, a middle flange gasket is fixed in the flange groove, the middle flange gasket is assembled on the top of the cage sleeve, a valve cover is provided on the top of the middle flange assembly, the valve cover is fixed in the valve body by symmetrical positioning bolts, and the positioning bolts are threadedly connected in the valve body.

Description

Technical Field

[0001] The invention relates to an online detachable double-sealing stop valve seat structure. Background Art

[0002] At present, the stop valve usually adopts a straight-through single-seat seal, which is a forced-seal switch valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. When used in a medium containing particles, high pressure, and frequent opening and closing, the valve seat is easily eroded and worn, resulting in seal leakage. Since the valve seat sealing surface is directly welded on the valve body, once the valve seat is damaged, the valve needs to be replaced as a whole, which is time-consuming and labor-intensive. The overall structure is not flexible enough and the sealing is not strong. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an online detachable double-seal stop valve seat structure, which has the advantage that the double-seal structure can re-establish the valve seat sealing function, achieve perfect sealing performance of the valve, and realize online detachable replacement of the valve seat and valve disc, which is easy to operate and interchangeable, saves production costs, and achieves the goal of energy conservation and emission reduction.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: an online detachable double-seal stop valve seat structure, comprising a valve body, a transfer groove is provided in the valve body, a transfer gasket is provided in the transfer groove, a valve seat is provided on the top of the transfer gasket, a cage is installed on the valve seat, a valve stem assembly is installed in the cage, a flange groove is provided in the valve body, a middle flange gasket is fixed in the flange groove, the middle flange gasket is assembled on the top of the cage, a valve cover is provided on the top of the middle flange assembly, the valve cover is fixed in the valve body by symmetrical positioning bolts, and the positioning bolts are threadedly connected in the valve body.

[0005] Furthermore, a first sealing surface is provided on the valve seat, a step groove is provided on the first sealing surface, a second sealing surface is provided on the step groove, and both the first sealing surface and the second sealing surface are erosion-resistant high-strength cemented carbide sealing surfaces.

[0006] Furthermore, the valve stem assembly is composed of a disc spring, a steel ball, a large valve flap, a small valve flap, a cushion block, a two-ring, a pressure cover, and a valve stem. The disc spring is placed in the positioning hole of the large valve flap, and a small valve flap is provided at the bottom of the disc spring. The small valve flap is also assembled in the positioning hole of the large valve flap. A bead hole is provided in the positioning hole of the large valve flap, and a steel ball is installed in the bead hole. The small valve flap is provided with a slot, and the steel ball rolls in the slot. The large valve flap is provided with a guide groove, and the guide groove is positioned and matched with the small valve flap. The bead hole needs to be welded and blocked, the cushion block is fixed to the inner groove of the large valve flap, the two-ring is inserted into the annular groove of the valve stem, the valve stem is installed in the large valve flap, and the rod head at the bottom of the valve stem contacts the cushion block. An internal threaded hole is provided at the top of the large valve flap, and the pressure cover is threadedly connected in the internal threaded hole and spot welded, and the valve cover passes through the valve stem and is fixed by positioning bolts.

[0007] Furthermore, a third sealing surface is provided at the bottom of the large valve disc, and the third sealing surface is a erosion-resistant high-strength hard alloy sealing surface.

[0008] Furthermore, a fourth sealing surface is provided at the bottom of the small valve disc, and the fourth sealing surface is a erosion-resistant high-strength hard alloy sealing surface.

[0009] Furthermore, the first sealing surface is tightly fitted with the fourth sealing surface, and the second sealing surface is tightly fitted with the third sealing surface.

[0010] In summary, the present invention has the following beneficial effects:

[0011] Through the split design, the valve seat, large valve disc, small valve disc and valve stem can be removed at will, which improves the flexibility of the overall structure and realizes online disassembly; the steel ball can be used to roll in the slot of the small valve disc, so that the small valve disc can be moved up and down, which improves the overall movement stability and flexibility, and the one side of the bead hole is welded and sealed to improve the overall sealing; when closing the valve, the disc spring pushes the small valve disc downward under the elastic action, so that the fourth sealing surface at the bottom of the small valve disc first contacts the first sealing surface of the valve seat, and realizes active load under the action of the disc spring, so that the first sealing surface and the fourth sealing surface are closely fitted to realize the first seal; as the valve stem is closed, the large valve disc also drops, and finally the third sealing surface at the bottom of the large valve disc is tightly fitted to the second sealing surface of the valve seat to realize the second seal, and finally the double sealing function of the valve is realized to fully ensure the sealing performance of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

[0013] Figure 1 The present invention is a schematic diagram of a valve seat structure of an online detachable double-seal stop valve according to a preferred embodiment of the present invention.

[0014] Figure 2 It is a structural schematic diagram of the valve body of the present invention.

[0015] Figure 3 Schematic diagram of the valve stem assembly of the present invention.

[0016] Figure 4 It is a structural schematic diagram of the large valve flap of the present invention.

[0017] Figure 5 It is a structural schematic diagram of the valve stem of the present invention.

[0018] Figure 6 It is a schematic structural diagram of the small valve flap of the present invention.

[0019] Figure 7 It is a structural schematic diagram of the valve seat of the present invention.

[0020] In the figure, 1. valve body; 2. adapter gasket; 3. valve seat; 31. first sealing surface; 32. second sealing surface; 4. cage; 5. valve stem assembly; 51. disc spring; 52. steel ball; 53. large valve disc; 531. positioning hole; 532. bead hole; 533. inner groove; 534. inner threaded hole; 535. guide groove; 536. third sealing surface; 54. small valve disc; 541. card groove; 542. fourth sealing surface; 55. gasket; 56. two-in-one ring; 57. pressure cover; 58. valve stem; 581. annular groove; 582. rod head; 6. middle flange gasket; 7. valve cover; 8. positioning bolt; 9. adapter groove; 10. flange groove. DETAILED DESCRIPTION

[0021] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 2 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0022] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] Embodiment 1: A double-seal stop valve seat structure that can be disassembled online, such as Figure 1-7 As shown, it comprises a valve body 1, a transfer groove 9 is arranged in the valve body 1, a transfer gasket 2 is arranged in the transfer groove 9, and a valve seat 3 is arranged on the top of the transfer gasket.

[0024] like Figure 7As shown, the valve seat 3 is provided with a first sealing surface 31, the first sealing surface 31 is provided with a step groove, the step groove is provided with a second sealing surface 32, and the first sealing surface 31 and the second sealing surface 32 are both erosion-resistant high-strength cemented carbide sealing surfaces, and the valve seat 3 is equipped with a cage sleeve 4, and a valve stem assembly 5 is installed in the cage sleeve 4.

[0025] like Figure 3 As shown, the valve stem assembly 5 is composed of a disc spring 51, a steel ball 52, a large valve flap 53, a small valve flap 54, a cushion block 55, a two-ring 56, a gland 57, and a valve stem 58. The disc spring 51 is placed in the positioning hole 531 of the large valve flap 53. A small valve flap 54 is provided at the bottom of the disc spring 51. The small valve flap 54 is also assembled in the positioning hole 531 of the large valve flap 53. A bead hole 532 is provided in the positioning hole 531 of the large valve flap 53. A steel ball 52 is installed in the bead hole 532. The small valve flap 54 is provided with a slot 541. The steel ball 52 rolls in the slot 541. The large valve flap 53 is provided with a guide groove 535, and the guide groove 535 is positioned and matched with the small valve flap 54. The bead hole 532 needs to be welded and blocked. The cushion block 55 is fixed In the inner groove 533 of the large valve disc 53, the two-ring 56 is inserted into the annular groove 581 of the valve stem 58, the valve stem 58 is installed in the large valve disc 53, and the rod head 582 at the bottom of the valve stem 58 contacts the cushion block 55, the top of the large valve disc 53 is provided with an internal threaded hole 534, the pressure cover 57 is threadedly connected in the internal threaded hole 534 and spot welded, the valve cover 7 passes through the valve stem 58 and is fixed by the positioning bolts 8; the valve body 1 is provided with a flange groove 10, the flange groove 10 is fixed with a middle flange gasket 6, the middle flange gasket 6 is assembled on the top of the cage sleeve 4, the top of the middle flange assembly is provided with a valve cover 7, the valve cover 7 is fixed in the valve body 1 by symmetrical positioning bolts 8, and the positioning bolts 8 are threaded in the valve body 1.

[0026] like Figure 4 As shown, a third sealing surface 536 is provided at the bottom of the large valve flap 53, and the third sealing surface 536 is a erosion-resistant high-strength hard alloy sealing surface.

[0027] like Figure 6 As shown, a fourth sealing surface 542 is provided at the bottom of the small valve flap 54, and the fourth sealing surface 542 is a erosion-resistant high-strength hard alloy sealing surface.

[0028] The first sealing surface 31 at the bottom of the valve seat 3 is tightly fitted with the fourth sealing surface 542 at the bottom of the small valve disc 54, and the second sealing surface 32 at the bottom of the valve seat 3 is tightly fitted with the third sealing surface 536 at the bottom of the large valve disc.

[0029] Working principle: When the valve is closed, the disc spring 51 pushes the small valve flap 54 downward under the action of elasticity, so that the fourth sealing surface 542 at the bottom of the small valve flap 54 first contacts the first sealing surface 31 of the valve seat 3, and realizes active load under the action of the disc spring 51, so that the first sealing surface 31 and the fourth sealing surface 542 fit tightly to realize the first seal; as the valve stem 58 is closed, the large valve flap 53 also descends, and finally the third sealing surface 536 at the bottom of the large valve flap 53 fits tightly with the second sealing surface 32 of the valve seat 3 to realize the second seal, and finally realizes the double sealing function of the valve, fully ensuring the sealing performance of the valve.

[0030] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. An online removable double-seal stop valve seat structure, characterized in that: The invention comprises a valve body (1), wherein a transfer groove (9) is provided in the valve body (1), a transfer gasket (2) is provided in the transfer groove (9), a valve seat (3) is provided on the top of the transfer gasket (2), a cage sleeve (4) is mounted on the valve seat (3), a valve stem assembly (5) is installed in the cage sleeve (4), a flange groove (10) is provided in the valve body (1), a middle flange gasket (6) is fixed in the flange groove (10), the middle flange gasket (6) is mounted on the top of the cage sleeve (4), a valve cover (7) is provided on the top of the middle flange gasket (6), the valve cover (7) is fixed in the valve body (1) by symmetrical positioning bolts (8), the positioning bolts (8) are threadedly connected in the valve body (1), and the valve seat (3) is provided with a plurality of flanges (10) and a plurality of flanges (6) are provided on the top of the cage sleeve (4). A first sealing surface (31) is provided on the valve stem (5), a step groove is provided on the first sealing surface (31), a second sealing surface (32) is provided on the step groove, and both the first sealing surface (31) and the second sealing surface (32) are erosion-resistant high-strength hard alloy sealing surfaces. The valve stem assembly (5) consists of a disc spring (51), a steel ball (52), a large valve disc (53), a small valve disc (54), a cushion block (55), a two-ring (56), a gland (57), and a valve stem (58). The disc spring (51) is placed in a positioning hole (531) of the large valve disc (53). A small valve disc (54) is provided at the bottom of the disc spring (51), and the small valve disc (54) is also assembled in the positioning hole (531) of the large valve disc (53). A bead hole (532) is provided in the positioning hole (531) of the valve flap (53), and a steel ball (52) is installed in the bead hole (532). The small valve flap (54) is provided with a clamping groove (541), and the steel ball (52) rolls in the clamping groove (541). The large valve flap (53) is provided with a guide groove (535), and the guide groove (535) is positioned and matched with the small valve flap (54). The bead hole (532) needs to be welded and blocked. The cushion block (55) is fixed to the inner groove (533) of the large valve flap (53). The two-ring (56) is clamped into the annular groove (581) of the valve stem (58). The valve stem (58) is installed in the large valve flap (53), and the stem head (582) at the bottom of the valve stem (58) is connected to the cushion block (55). ), the top of the large valve flap (53) is provided with an internal threaded hole (534), the pressure cover (57) is threadedly connected in the internal threaded hole (534) and spot welded, the valve cover (7) passes through the valve stem (58) and is fixed by positioning bolts (8), the bottom of the large valve flap (53) is provided with a third sealing surface (536), the third sealing surface (536) is a erosion-resistant high-strength hard alloy sealing surface, the bottom of the small valve flap (54) is provided with a fourth sealing surface (542), the fourth sealing surface (542) is a erosion-resistant high-strength hard alloy sealing surface, the first sealing surface (31) is tightly fitted with the fourth sealing surface (542), and the second sealing surface (32) is tightly fitted with the third sealing surface (536).

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