Nuclear-grade disc spring stop check valve

Abstract

The utility model provides a nuclear-grade disc spring stop check valve which comprises a valve body, an outlet end is installed at the lower end of the valve body, a stop valve seat is machined on the side, close to an inlet end, in the outlet end, a check valve seat is machined on the side, away from the inlet end, in the outlet end, and a check valve clack matched with the check valve seat is arranged in the outlet end. A check valve clack matched with the check valve seat is arranged in the valve body, a vertical portion of the check valve clack penetrates through the valve clack fixing frame and is in threaded connection with a valve clack nut, the vertical portion of the check valve clack is sleeved with a limiting sleeve, the limiting sleeve is sleeved with a disc spring set, a valve rod is installed on the check valve clack, and the disc spring set is connected with the valve rod. The utility model has the following beneficial effects: the problems of insufficient rigidity and short service life of a spring are solved, and the problems of gap blockage caused by impurity deposition and failure caused by blocked movement of an elastic piece are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a nuclear grade disc spring stop check valve and belongs to the valve field. BACKGROUND

[0002] The stop check valve is a valve combining the functions of the stop valve for controlling the on-off of the pipeline and the check valve for preventing the backflow of the fluid, has the advantages of simple structure, high space utilization and few leakage points, is widely applied to the industries of ships, petroleum and chemical engineering, water supply and the like, and is commonly used as a medium discharge valve at the outlet of the pipeline and is particularly widely used in the cabin environment with limited arrangement space. The traditional stop check valve has a single valve disc structure, the valve disc simultaneously performs the stop function and the check function, a spring is arranged in the valve disc, and the spring is used to press the valve disc and the valve seat tightly all the time. When the valve rod is lowered to press the valve disc on the valve seat, the stop function is performed; when the valve rod lifts the valve disc, the valve disc continues to be tightly attached to the valve seat by the spring force to perform the check function. Limited by the limited volume of the valve disc and the space in the valve body, the spring usually has a small diameter and poor rigidity, is easily affected by the uneven medium pressure to leak, and causes the check sealing to fail. Meanwhile, the spring is easily lost in elasticity after repeated compression and recovery in the long-term use, and has a short service life. In terms of structure arrangement, the spring is usually arranged on the side contacting the medium at the outlet, is easily affected by the impurities to affect the rebound, and causes the reliability, service life and application range of the stop check valve to be greatly limited. SUMMARY

[0003] In view of the defects in the prior art, the utility model aims at providing a nuclear grade disc spring stop check valve to solve the problems in the background.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a nuclear grade disc spring stop check valve, comprising a valve body, an outlet end is installed at the lower end of the valve body, a middle flange end is installed at the upper end of the valve body, an inlet end perpendicular to the outlet end is installed on the outer surface of the valve body, a stop valve seat is processed on the side of the outlet end close to the inlet end, a check valve seat is processed on the side of the outlet end away from the inlet end, a check valve disc matched with the check valve seat is arranged in the outlet end, a stop valve disc matched with the stop valve seat is arranged in the valve body, a valve disc fixing frame is installed at the lower side of the stop valve seat, a vertical part on the check valve disc penetrates the valve disc fixing frame and is threadedly connected with a valve disc nut, a limiting sleeve is sleeved on the vertical part on the check valve disc, a disc spring group is sleeved on the limiting sleeve, the disc spring group is arranged between the check valve seat and the valve disc fixing frame, a valve rod is installed on the stop valve disc, a valve cover is connected with the middle flange end through a fastener, and the upper end of the valve rod penetrates the valve cover and is threadedly connected with a valve rod nut in the valve cover.

[0005] Further, the valve cover outer surface is provided with a through hole, the through hole is provided with a packing pressing sleeve, the packing pressing sleeve is connected with the middle flange end through fasteners, the lower side of the packing pressing sleeve is provided with packing, the packing is wrapped on the valve stem, the area below the packing pressing sleeve of the valve cover is recessed to form a countersunk groove, the packing is arranged in the countersunk groove, and the valve stem penetrates the countersunk groove.

[0006] Further, the upper surface of the valve cover is recessed downward to form a cavity, the valve stem nut is arranged in the cavity, the uppermost end of the valve stem nut is threadedly connected with a round nut, the position of the valve stem nut below the round nut is a hexagonal straight section, a hexagonal sleeve is arranged on the hexagonal straight section, two handles are symmetrically arranged on the outer surface of the hexagonal sleeve, the upper position of the valve stem nut is processed with a first internal thread matched with the first external thread of the upper end of the valve stem, the lower end of the valve stem nut is a boss section, thrust ball bearings are arranged on the upper side and the lower side of the boss section, the thrust ball bearings are arranged on the valve stem nut, the upper side of the uppermost thrust ball bearing is provided with a bearing pressing cover, and the bearing pressing cover is arranged in the upper position of the cavity.

[0007] Further, the outer surface of the boss section is processed with a second external thread, one side of the boss section is provided with an arc-shaped plate arranged in the cavity, the inner surface of the arc-shaped plate is processed with a second internal thread matched with the second external thread, an indicating column is arranged on the side of the arc-shaped plate away from the boss section, and the outer surface of the valve cover is provided with a vertical groove same as the cavity, and the indicating column is arranged in the vertical groove.

[0008] Further, one end of the valve cover close to the middle flange end is connected with an upper flange end, and the upper flange end is connected with the middle flange end through fasteners.

[0009] Further, the inlet end is provided with a first flange away from the valve body, and the outlet end is provided with a second flange away from the valve body.

[0010] Further, the side of the first flange away from the inlet end and the side of the second flange away from the outlet end are both provided with a convex ring part, one side of the convex ring part is recessed to form an annular groove, and a sealing ring is arranged in the annular groove.

[0011] Further, the upper surface of the middle flange end is recessed downward to form an annular sealing groove, a sealing gasket is arranged in the sealing groove, and the sealing gasket is arranged between the middle flange end and the valve cover.

[0012] The utility model discloses beneficial effects:

[0013] 1. The disc spring set provides the check assembly elastic force, and reciprocating motion is pushed to the check valve petal, and the stiffness coefficient of the disc spring set is higher than that of the spring in the same space, and the durability is stronger, and the problems of low spring stiffness and short service life are solved.

[0014] 2. The disc spring assembly is located inside the valve outlet, which isolates the elastic element from continuous contact with the external medium, avoiding the problem of impurities clogging the gap and hindering the movement of the elastic element, thus preventing failure. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a nuclear-grade disc spring stop check valve according to this utility model;

[0017] Figure 2 This is a cross-sectional view of a nuclear-grade disc spring stop check valve according to the present invention;

[0018] Figure 3 This is a cross-sectional view of the valve body in a nuclear-grade disc spring shut-off check valve according to this utility model;

[0019] Figure 4 This is a perspective view of the valve stem nut in a nuclear-grade disc spring stop check valve according to this utility model;

[0020] Figure 5 This is a perspective view of the valve disc fixing bracket in a nuclear-grade disc spring stop check valve according to this utility model;

[0021] In the diagram: 1-Valve body, 2-Upper flange end, 3-Valve cover, 4-Packing sleeve, 5-Vertical groove, 6-Indicator column, 7-Round nut, 8-Hexagonal sleeve, 9-Handle, 10-Inlet end, 11-First flange, 12-Raised ring, 13-Sealing ring, 14-Second flange, 15-Outlet end, 16-Valve stem, 17-Valve stem nut, 18-Thrust ball bearing, 19-Stop valve disc, 20-Valve disc nut, 21-Valve disc retainer, 22-Disc spring assembly, 23-Limit sleeve, 24-Check valve disc, 25-Packing, 26-Bearing cover, 101-Stop valve seat, 102-Check valve seat, 103-Middle flange end, 1701-Hexagonal straight section, 1702-Boss section. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please see Figures 1-3The utility model provides a technical scheme: a nuclear grade disc spring stop check valve, including valve body 1, the lower end of valve body 1 is installed with outlet end 15, the upper end of valve body 1 is installed with middle flange end 103, the outer surface of valve body 1 is installed with the perpendicular import end 10 of outlet end 15, the end of import end 10 away from valve body 1 is installed with first flange 11, the end of outlet end 15 away from valve body 1 is installed with second flange 14, the side of first flange 11 away from import end 10 and the side of second flange 14 away from outlet end 15 are all installed with convex ring part 12, the one side of convex ring part 12 is recessed and forms annular groove, the sealing ring 13 is inserted in annular groove, and the design of sealing ring 13 guarantees the sealing between first flange 11, second flange 14 and the flange on pipeline.

[0024] Refer to Figures 1-5 The side of outlet end 15 close to import end 10 is processed with stop valve seat 101, the side of outlet end 15 away from import end 10 is processed with check valve seat 102, the check valve seat 102 is equipped with check valve flap 24 in outlet end 15, the stop valve seat 101 is equipped with stop valve flap 19 in valve body 1, the vertical part on check valve flap 24 is screwed with valve nut 20 and is connected with valve flap fixing frame 21, the vertical part on check valve flap 24 is sleeved with limiting sleeve 23, the limiting sleeve 23 is sleeved with disc spring group 22, the disc spring group 22 is arranged between check valve seat 102 and valve flap fixing frame 21, the stop valve flap 19 is installed with valve rod 16, the upper flange end 2 is connected and fixed with the one end of valve cover 3 close to middle flange end 103, the upper flange end 2 is connected with middle flange end 103 through fastener, the upper surface of middle flange end 103 is recessed and forms annular sealing groove, the sealing pad is arranged in sealing groove, the sealing pad is between middle flange end 103 and valve cover 3, the upper end of valve rod 16 is screwed with valve rod nut 17 in valve cover 3 and is connected with valve cover 3, the check assembly elastic force is provided through disc spring group 22, check valve flap 24 is reciprocated, the stiffness coefficient of disc spring group 22 is higher than spring in the same space, and the durability is stronger, the problems of insufficient spring stiffness and low life are solved, the disc spring group 22 is located in the inside of valve outlet, the continuous contact of elastic element and external medium is isolated, and the problems of blockage gap, elastic piece movement obstruction and failure caused by impurity deposition are avoided.

[0025] Refer to Figures 1-4The outer surface of the valve cover 3 is provided with a through hole, and the through hole is provided with a packing pressing sleeve 4. The packing pressing sleeve 4 is connected with the middle flange end 103 through a fastener. The lower side of the packing pressing sleeve 4 is provided with packing 25. The packing 25 is wrapped on the valve rod 16. The area directly below the packing pressing sleeve 4 of the valve cover 3 is recessed to form a countersunk groove. The packing 25 is arranged in the countersunk groove. The valve rod 16 penetrates the countersunk groove. The upper surface of the valve cover 3 is downwardly recessed to form a cavity. The valve rod nut 17 is arranged in the cavity. The uppermost end of the valve rod nut 17 is threadedly connected with a round nut 7. The part of the valve rod nut 17 below the round nut 7 is a hexagonal straight section 1701. A hexagonal sleeve 8 is sleeved on the hexagonal straight section 1701. Two handles 9 are symmetrically arranged on the outer surface of the hexagonal sleeve 8. A first internal thread is processed on the upper part of the valve rod nut 17 and matches a first external thread on the upper end of the valve rod 16. The lower end of the valve rod nut 17 is a boss section 1702. A thrust ball bearing 18 is arranged on the upper side of the boss section 1702 and the lower side of the boss section 1702. The thrust ball bearing 18 is sleeved on the valve rod nut 17. A bearing pressing cover 26 is arranged on the upper side of the uppermost thrust ball bearing 18. The bearing pressing cover 26 is arranged at the upper part of the cavity. The valve rod nut 17 is rotated by the structure formed by the handles 9 and the hexagonal sleeve 8. Under the action of the two thrust ball bearings 18, the valve rod nut 17 rotates in the cavity, and the valve rod 16 reciprocates up and down. A second external thread is processed on the outer surface of the boss section 1702. An arc-shaped plate is arranged on one side of the boss section 1702 and in the cavity. A second internal thread is processed on the inner surface of the arc-shaped plate and matches the second external thread. An indicating column 6 is arranged on the side of the arc-shaped plate away from the boss section 1702. A vertical groove 5 is formed on the outer surface of the valve cover 3 and matches the cavity. The indicating column 6 is inserted in the vertical groove 5. During the rotation of the valve rod nut 17, the arc-shaped plate moves upward or downward. At this time, the indicating column 6 moves upward or downward in the vertical groove 5, so that the indicating function is realized, and the position of the stop valve disc 19 is easily understood.

[0026] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. The description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nuclear-grade disc spring stop check valve, comprising a valve body (1), characterized in that: The valve body (1) has an outlet end (15) installed at its lower end and a middle flange end (103) installed at its upper end. An inlet end (10) perpendicular to the outlet end (15) is installed on the outer surface of the valve body (1). A stop valve seat (101) is machined on the side of the outlet end (15) closest to the inlet end (10), and a check valve seat (102) is machined on the side of the outlet end (15) furthest from the inlet end (10). A check valve disc (24) cooperating with the check valve seat (102) is provided inside the outlet end (15). A stop valve disc (19) cooperating with the stop valve seat (101) is provided inside the valve body (1). The stop valve seat (101) is located below... A valve disc fixing bracket (21) is installed on the side. The vertical part of the check valve disc (24) passes through the valve disc fixing bracket (21) and is threadedly connected to the valve disc nut (20). A limiting sleeve (23) is fitted on the vertical part of the check valve disc (24). A disc spring assembly (22) is fitted on the limiting sleeve (23). The disc spring assembly (22) is located between the check valve seat (102) and the valve disc fixing bracket (21). A valve stem (16) is installed on the stop valve disc (19). A valve cover (3) is connected to the middle flange end (103) by fasteners. The upper end of the valve stem (16) passes through the valve cover (3) and is threadedly connected to the valve stem nut (17) inside the valve cover (3).

2. The nuclear-grade disc spring check valve according to claim 1, characterized in that: The valve cover (3) has a through opening on its outer surface. A packing sleeve (4) is provided in the through opening. The packing sleeve (4) is connected to the middle flange end (103) by fasteners. A packing (25) is provided on the lower side of the packing sleeve (4). The packing (25) wraps around the valve stem (16). The area of ​​the valve cover (3) directly below the packing sleeve (4) is recessed to form a countersunk groove. The packing (25) is placed in the countersunk groove. The valve stem (16) passes through the countersunk groove.

3. The nuclear-grade disc spring stop check valve according to claim 1, characterized in that: The upper surface of the valve cover (3) is recessed downward to form a cavity. The valve stem nut (17) is set in the cavity. The uppermost end of the valve stem nut (17) is threaded with a round nut (7). The part of the valve stem nut (17) below the round nut (7) is a hexagonal straight section (1701). A hexagonal sleeve (8) is fitted on the hexagonal straight section (1701). Two handles (9) are symmetrically installed on the outer surface of the hexagonal sleeve (8). The upper part of the valve stem nut (17) is filled with... The valve stem nut (17) has a first internal thread that mates with the first external thread at the upper end of the valve stem (16). The lower end of the valve stem nut (17) is a boss section (1702). Both the upper and lower sides of the boss section (1702) are provided with thrust ball bearings (18). The thrust ball bearings (18) are sleeved on the valve stem nut (17). The uppermost thrust ball bearing (18) is provided with a bearing cap (26). The bearing cap (26) is installed in the upper part of the cavity.

4. A nuclear-grade disc spring stop check valve according to claim 3, characterized in that: The outer surface of the boss section (1702) is machined with a second external thread. An arc-shaped plate is provided on one side of the boss section (1702) and is located in the cavity. The inner surface of the arc-shaped plate is machined with a second internal thread that matches the second external thread. An indicator post (6) is installed on the side of the arc-shaped plate that is away from the boss section (1702). The outer surface of the valve cover (3) is provided with a vertical groove (5) that is the same as the cavity. The indicator post (6) is inserted into the vertical groove (5).

5. A nuclear-grade disc spring stop check valve according to claim 1, characterized in that: The valve cover (3) is fixed to the upper flange end (2) at the end near the middle flange end (103), and the upper flange end (2) is connected to the middle flange end (103) by fasteners.

6. The nuclear-grade disc spring stop check valve according to claim 1, characterized in that: The inlet end (10) away from the valve body (1) is equipped with a first flange (11), and the outlet end (15) away from the valve body (1) is equipped with a second flange (14).

7. A nuclear-grade disc spring stop check valve according to claim 6, characterized in that: The first flange (11) and the second flange (14) are both equipped with a raised ring (12) on the side facing away from the inlet end (10) and the side facing away from the outlet end (15). One side of the raised ring (12) is recessed to form an annular groove, and a sealing ring (13) is inserted in the annular groove.

8. The nuclear-grade disc spring check valve according to claim 1, characterized in that: The upper surface of the middle flange end (103) is recessed downward to form an annular sealing groove. A sealing gasket is provided in the sealing groove, and the sealing gasket is located between the middle flange end (103) and the valve cover (3).

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