Soft sealing safety valve

Abstract

According to the technical scheme, the soft sealing safety valve is characterized by comprising a valve body, a valve seat inserted into the valve body, a valve clack arranged opposite to the valve seat, a soft sealing piece positioned on the valve clack and capable of being attached to the valve seat, an adjusting ring capable of rotating relative to the valve seat and a first set screw capable of limiting rotation of the adjusting ring and connected to the valve body. The variable adjusting ring is in threaded connection with the exterior of the valve seat and located in the valve body, the second set screw is used for limiting rotation of the variable adjusting ring and connected to the valve body, the adjusting ring is in threaded connection with the exterior of the variable adjusting ring, and the valve seat, the adjusting ring and the variable adjusting ring are coaxially arranged; the height of the second set screw is smaller than that of the first set screw, the inner diameter of the variable adjusting ring is larger than the diameter of the soft sealing piece, and the problem that in the prior art, the soft sealing piece is prone to being damaged, and sealing performance is affected is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more specifically to a soft-sealed safety valve. Background Art

[0002] The traditional soft-sealed spring safety valve includes a valve body, a valve seat positioned inside the valve body, a valve flap arranged opposite to the valve seat, a soft-sealing member positioned on the surface of the valve flap facing the valve seat, and an adjusting ring threadedly connected to the outside of the valve seat. By rotating the adjusting ring relative to the valve seat, the opening and closing pressure difference between the valve flap and the valve seat is changed, and the sealing between the valve flap and the valve seat is achieved by the close contact between the soft-sealing member and the valve seat. However, there are defects. Due to processing errors or unreasonable selection of the thickness of the soft-sealing member, the extrusion force between the valve seat and the soft-sealing member is too large, resulting in excessive local deformation and damage of the soft-sealing member, shortening the service life of the soft-sealing member and reducing the sealing effect of the soft-sealing member, indirectly causing frequent replacement of the soft-sealing member and high maintenance costs. Summary of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a soft-sealed safety valve with adjustable adhesion force, stable sealing performance and long service life between the soft-sealing member and the valve seat.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A soft-sealed safety valve includes a valve body, a valve seat inserted into the valve body, a valve flap arranged opposite to the valve seat, a soft-sealing member positioned on the valve flap and capable of fitting with the valve seat, an adjusting ring capable of rotating relative to the valve seat, and a first set screw capable of restricting the rotation of the adjusting ring and connected to the valve body. It also includes a variable adjusting ring threadedly connected to the outside of the valve seat and located inside the valve body, and a second set screw for restricting the rotation of the variable adjusting ring and connected to the valve body. The adjusting ring is threadedly connected to the outside of the variable adjusting ring. The valve seat, the adjusting ring and the variable adjusting ring are all coaxially arranged. The height where the second set screw is located is less than the height where the first set screw is located. The inner diameter of the variable adjusting ring is larger than the diameter of the soft-sealing member. By changing the height that the end of the variable adjusting ring protrudes from the end of the valve seat when the variable adjusting ring touches the valve flap, the adhesion force between the soft-sealing member and the valve seat is changed.

[0005] As a further improvement of the utility model, the valve flap includes a counterpulsation flap body and a gland detachably connected to the counterpulsation flap body. The soft-sealing member is annular, and the cavity surrounded by the inner wall is frustum-shaped. The outer wall of the gland is provided with a frustum wall capable of fitting with the inner wall of the soft-sealing member. The gland and the soft-sealing member are coaxially arranged.

[0006] >As a further improvement of the utility model, the counterpulsation flap body is provided with a centering groove for the end of the variable adjusting ring to extend into.

[0007] Advantages of the present utility model: By changing the height of the end of the variable adjustment ring above the end of the valve seat when the variable adjustment ring touches the valve flap, the adhesion force between the soft seal and the valve seat is changed. Such a design can change the adhesion force between the soft seal and the valve seat compared with the prior art, making the deformation of the soft seal milder, compensating for the defect that the soft seal is damaged due to excessive deformation, thus ensuring the structural stability of the soft seal, indirectly improving the sealing stability between the soft seal and the valve seat, and at the same time indirectly extending the service life of the soft seal and reducing the maintenance period and cost. Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of the present utility model;

[0009] Figure 2 is Figure 1 an enlarged view of part A in

[0010] Figure 3 is Figure 2 an enlarged view of part B in

[0011] Reference numerals: 1, valve body; 2, valve seat; 3, valve flap; 31, backwash flap body; 32, gland; 33, frustum wall; 34, centering groove; 4, soft seal; 5, adjustment ring; 6, first set screw; 7, variable adjustment ring; 8, second set screw. Detailed Description of the Preferred Embodiment

[0012] The present utility model will be further described in detail below with reference to the drawings and embodiments. The same reference numerals are used for the same components.

[0013] Referring to Figures 1 to 3 as shown, a soft-sealed safety valve of this embodiment includes a valve body 1, a valve seat 2 inserted into the valve body 1, a valve flap 3 disposed opposite to the valve seat 2, a soft seal 4 positioned on the valve flap 3 and capable of fitting with the valve seat 2, an adjustment ring 5 capable of rotating relative to the valve seat 2, and a first set screw 6 capable of restricting the rotation of the adjustment ring 5 and connected to the valve body 1;

[0014] Based on the aforementioned prior art, it further includes a variable adjustment ring 7 and a second set screw 8. The variable adjustment ring 7 is coaxially and threadedly connected to the valve seat 2. The adjustment ring 5 is sleeved outside the variable adjustment ring 7 and threadedly connected to the variable adjustment ring 7. A plurality of slots for inserting the end of the second set screw 8 are processed on the part of the variable adjustment ring 7 that is not sleeved by the adjustment ring 5. The plurality of slots are circumferentially distributed around the axis of the valve seat 2. The second set screw 8 is hermetically connected to the valve body 1 and one end extends into the valve body 1. The height where the second set screw 8 is located is less than the height where the first set screw 6 is located. The inner diameter of the variable adjustment ring 7 is greater than the maximum diameter of the soft seal 4;

[0015] During use, the restrictions on the adjusting ring 5 and the variable adjusting ring 7 by the first set screw 6 and the second set screw 8 are released, that is, the first set screw 6 and the second set screw 8 are both rotated outwards from the valve body 1 so that the first set screw 6 and the second set screw 8 are separated from the adjusting ring 5 and the variable adjusting ring 7 respectively. Then, the variable adjusting ring 7 is rotated relative to the valve seat 2 until the elevation difference between the two ends of the variable adjusting ring 7 and the valve seat 2 is adjusted in place. Subsequently, the second set screw 8 is rotated inwards into the valve body 1 until the end of the second set screw 8 is inserted into the card slot of the variable adjusting ring 7. Then, the adjusting ring 5 is rotated relative to the variable adjusting ring 7. When the opening and closing pressure difference between the adjusting ring 5 and the valve flap 2 is adjusted to a predetermined value, the rotation of the adjusting ring 5 is restricted again by the end of the first set screw 6; when in the working condition and the valve flap 2 moves downwards, the soft seal 4 partially penetrates into the inner cavity of the variable adjusting ring 7 and then fits with the end of the valve seat 2. As the valve flap 2 continues to move downwards, the soft seal 4 undergoes compressive deformation until the valve flap 2 touches the variable adjusting ring 7, and then the deformation of the soft seal 4 is in place;

[0016] Such a design can change the adhesion force between the soft seal 4 and the valve seat 2 compared with the prior art, making the deformation of the soft seal 4 gentle, compensating for the defect that the soft seal 4 is damaged due to excessive deformation, thereby ensuring the structural stability of the soft seal 4, indirectly improving the sealing stability between the soft seal 4 and the valve seat 2, and at the same time indirectly extending the service life of the soft seal 4 and reducing the maintenance period and cost.

[0017] As a specific embodiment of the improvement, referring to Figure 2 as shown, the valve flap 3 includes a recoil flap body 31 and a gland 32 detachably connected to the recoil flap body 31. A threaded hole is provided in the center of the recoil flap body 31, and a through hole is provided in the center of the gland 32. The soft seal 4 is a soft sealing ring. The inner wall of the soft seal 4 is obliquely cut so that the cavity enclosed by the inner wall of the soft seal 4 is frustum-shaped. A frustum wall 33 that can fit well with the inner wall of the soft seal 4 is machined on the outer wall of the gland 32. During the assembly process, first, the soft seal 4 is placed in the groove of the recoil flap body 31 and the soft seal 4 is coaxial with the recoil flap body 31. The small port of the inner cavity of the soft seal 4 faces the recoil flap body 31. Then, the gland 32 is installed in the groove of the recoil flap body 31 and the frustum wall 33 fits well with the inner wall of the soft seal 4. Finally, bolts are passed through the gland 32 and screwed into the recoil flap body 31 so that the gland 32 is positioned in the recoil flap body 31. The soft seal 4 is limited in the recoil flap body 31 by the gland 32. The frustum wall 33 fits with the inner wall of the soft seal 4 and generates radial and axial forces on the soft seal 4 at the same time, so that the soft seal 4 is extruded and also generates radial extension. The soft seal 4 is evenly stressed and accurately positioned in the recoil flap body 31.

[0018] As a specific implementation of the improvement, as shown in FIG. 3, the recoil flap body 31 is provided with a centering groove 34 for the end of the variable adjustment ring 7 to extend into. The centering groove 34 is coaxially arranged with the groove of the recoil flap body 31 for accommodating the soft seal 4. By the end of the variable adjustment ring 7 extending into the centering groove 34, the valve flap 2 is always kept coaxial with the valve seat 2 as a whole, indirectly improving the centering property and structural stability of the valve flap 2.

[0019] The above description is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A soft-sealing safety valve, comprising a valve body (1), a valve seat (2) inserted into the valve body (1), a valve flap (3) arranged opposite to the valve seat (2), a soft-sealing member (4) positioned on the valve flap (3) and capable of fitting with the valve seat (2), an adjusting ring (5) capable of rotating relative to the valve seat (2), and a first set screw (6) capable of restricting the rotation of the adjusting ring (5) and connected to the valve body (1), characterized in that: It further includes a variable adjustment ring (7) threadedly connected to the outside of the valve seat (2) and located inside the valve body (1), and a second set screw (8) for restricting the rotation of the variable adjustment ring (7) and connected to the valve body (1). The adjustment ring (5) is threadedly connected to the outside of the variable adjustment ring (7). The valve seat (2), the adjustment ring (5), and the variable adjustment ring (7) are all coaxially arranged. The height where the second set screw (8) is located is less than the height where the first set screw (6) is located. The inner diameter of the variable adjustment ring (7) is greater than the diameter of the soft seal (4). By changing the height of the end of the variable adjustment ring (7) protruding from the end of the valve seat (2) when the variable adjustment ring (7) abuts against the valve flap (3), the adhesion force between the soft seal (4) and the valve seat (2) is changed.

2. The soft-sealed safety valve according to claim 1, characterized in that: The valve flap (3) includes a recoil flap body (31) and a gland (32) detachably connected to the recoil flap body (31). The soft seal (4) is annular and the cavity surrounded by the inner wall is frustum-shaped. A frustum wall (33) that can fit with the inner wall of the soft seal (4) is provided on the outer wall of the gland (32). The gland (32) and the soft seal (4) are coaxially arranged.

3. The soft-sealed safety valve according to claim 2, characterized in that: The recoil flap body (31) is provided with a centering groove (34) for the end of the variable adjustment ring (7) to extend into.

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