Stop valve with high sealing performance

Abstract

The utility model relates to the technical field of valves, in particular to a high-sealing-performance stop valve which comprises a valve body provided with a flow channel, a valve cover installed on the valve body, a valve rod penetrating through the valve cover and extending into the valve body and a valve clack connected with the valve rod and located in the valve body. A valve seat located below the valve clack is arranged in the valve body. A connecting structure is arranged between the valve clack and the valve rod and comprises a fixing block arranged on the valve rod, a fixing groove formed in the valve clack and a limiting ring. The fixing block is arranged in the fixing groove in a sliding mode, one side of the valve clack abuts against one end of the valve rod, and the peripheral face of the joint of the valve clack and the valve rod is sleeved with the limiting ring. Through the arrangement of the connecting structure, when the valve rod extrudes the valve clack and the valve clack extrudes the valve seat, force can be uniformly applied, so that the problem of side leakage caused by a gap between the valve clack and the valve seat due to non-uniform stress of the valve clack is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a high-sealing stop valve. Background Art

[0002] The stop valve is a closed-circuit valve that completely connects or cuts off a pipeline. It is widely used and is often used in the petroleum, chemical and other industries to control the flow of media in pipelines.

[0003] In the related technology, the stop valve usually includes a valve body, a valve disc and a valve stem. A valve seat for sealing against the valve disc is arranged inside the valve body. The valve stem axis of the stop valve is perpendicular to the valve seat sealing surface. The valve disc is opened and closed by rotating the valve stem to drive the valve disc to rise and fall. Once the stop valve is in the open state, there is no contact between its valve seat and the valve disc sealing surface. When it is closed, it has a very reliable cutting action.

[0004] The valve disc and valve stem of the existing stop valve are generally connected by threads. Due to wear due to long-term use, the influence of thermal expansion and contraction, and manufacturing and assembly errors, there is a gap easily in the connection between the valve disc and the valve stem. During the use of the stop valve, due to the impact of the medium, the valve disc and the valve stem may shake relative to each other. Especially when the valve body is installed in a non-vertical state, the valve disc will tilt to one side due to gravity, resulting in insufficient sealing of the stop valve when it is closed. There is room for improvement. Utility Model Content

[0005] The purpose of the present application is to provide a high-sealing stop valve to solve the problem in the above-mentioned related technology that during the application of the stop valve, the valve disc and the valve stem may shake relative to each other due to the impact of the medium, especially when the valve body is installed in a non-vertical state, the valve disc will tilt to one side due to gravity, causing the stop valve to have insufficient sealing when closed.

[0006] The high-sealing stop valve provided in this application adopts the following technical solution:

[0007] A high-sealing stop valve, comprising a valve body with a flow channel, a valve cover installed on the valve body, a valve stem that penetrates the valve cover and extends to the inside of the valve body, and a valve disc connected to the valve stem and located inside the valve body, wherein an actuator is provided at the outer end of the valve stem, and a valve seat located below the valve disc is provided inside the valve body; a connecting structure is provided between the valve disc and the valve stem, and the connecting structure comprises a fixing block provided on the valve stem, a fixing groove provided on the valve disc, and a limiting ring; the fixing block is slidably arranged in the fixing groove, one side of the valve disc abuts against one end of the valve stem, and the limiting ring is sleeved on the outer circumferential surface of the connection between the valve disc and the valve stem.

[0008] By adopting the above technical scheme, when the staff controls the on and off of the stop valve, the valve stem is driven to rotate relative to the valve body by rotating the actuator, and then the distance between the valve disc and the valve seat is adjusted to control the opening and closing of the stop valve; through the setting of the connecting structure, the fixed block is slidably arranged inside the fixed groove, so as to realize the limitation of the length direction of the axis of the valve stem and the valve disc, and the two contact surfaces of the valve stem and the valve disc can fit tightly, so that the pressure of the valve stem pressing the valve disc is uniform; and the valve disc and the valve stem are circumferentially limited and fixed by the limiting ring, so that the valve stem and the valve disc form a stable combination; when the valve is closed, even if the stop valve is installed at an angle, the valve stem can apply force evenly when squeezing the valve disc and the valve disc squeezes the valve seat, thereby reducing the problem of uneven force on the valve disc causing a gap between the valve seat and the valve seat, thereby causing side leakage.

[0009] Optionally, the outer edges of the sides of the valve stem and the valve disc that are close to each other are both provided with an annular clearance groove for the limiting ring to be set into.

[0010] By adopting the above technical solution, when the limit ring is installed and fixed, the limit ring is sleeved inside the annular clearance groove provided on the valve stem and the valve disc, thereby reducing the possibility of the limit ring being offset or misaligned, thereby improving the installation stability of the limit ring.

[0011] Optionally, a sealing gasket is provided on the side of the valve disc away from the valve stem, a sealing groove for inserting the sealing gasket is opened on the side of the valve disc away from the valve stem, and a positioning convex ring capable of pressing tightly against the sealing gasket is provided on the side edge of the valve seat close to the valve disc.

[0012] By adopting the above technical solution, the sealing gasket is fixedly installed on the inner wall of the sealing groove, thereby realizing the installation and fixation of the sealing gasket; when the valve disc closes the flow channel in the valve body, the sealing gasket on the valve disc is tightly pressed against the positioning convex ring, thereby reducing the possibility of leakage of the transported medium from the gap between the valve disc and the valve seat, thereby improving the sealing performance of the stop valve when it is in a closed state.

[0013] Optionally, a first fixing hole is opened on the sealing gasket, and a fixing screw penetrating the first fixing hole is provided on the bottom side of the sealing groove of the valve flap, and a fixing nut for fastening the sealing gasket is provided on the fixing screw.

[0014] By adopting the above technical solution, when installing the sealing gasket, the sealing gasket is put on the fixing screw and then fastened with the fixing nut. This arrangement facilitates the installation and removal of the sealing gasket. Even if the sealing gasket is worn after a period of use, it is easy to remove and replace the sealing gasket.

[0015] Optionally, an annular pressure plate is provided between the fixing nut and the sealing gasket, and a second fixing hole for the fixing screw to pass through is opened on the annular pressure plate.

[0016] By adopting the above technical solution, after the sealing gasket is installed, the annular pressure plate is simultaneously sleeved on the outer circumferential surface of the fixed screw, and the annular pressure plate is tightened using a fixing nut. The annular pressure plate presses the sealing gasket to reduce the possibility of the sealing gasket loosening in the sealing groove and improve the installation stability of the sealing gasket in the sealing groove.

[0017] Optionally, an anti-loosening gasket is provided between the fixing nut and the annular pressure plate, and the anti-loosening gasket includes a gasket body, a bent portion arranged at the edge of the gasket body, and a fixing portion arranged at the edge of the gasket body; the bent portion is used to keep the gasket body and the fixing nut relatively fixed, and the fixing portion is used to keep the gasket body and the valve disc relatively fixed.

[0018] By adopting the above technical scheme, in order to prevent the fixing nut from loosening relative to the fixing screw, an anti-loosening gasket is installed between the fixing nut and the annular pressure plate, wherein the bent portion on the anti-loosening gasket is used to keep the gasket body and the fixing nut relatively fixed, and the fixing portion on the anti-loosening gasket is used to keep the gasket body and the valve disc relatively fixed, thereby achieving relative fixation between the fixing nut and the valve disc and reducing the possibility of loosening of the fixing nut relative to the fixing screw. The fixing nut is used to lock the annular pressure plate and the sealing gasket, thereby improving the installation stability of the annular pressure plate and the sealing gasket.

[0019] Optionally, the bending portion is bent toward the side away from the annular pressure plate, and one side of the bending portion abuts against the outer side of the fixing nut; a fixing pin is provided on the side of the valve flap, and a first through hole for the fixing pin is coaxially provided on the fixing portion, the annular pressure plate and the sealing gasket, and a first fastening groove for the fixing pin to be embedded is provided on the bottom side of the sealing groove of the valve flap.

[0020] By adopting the above technical scheme, during the application of the anti-loosening gasket, the side surface of the bent portion is bent and abuts against the outer side surface of the fixing nut, thereby realizing the relative fixation of the anti-loosening gasket and the fixing nut; the fixing pin penetrates the first through hole on the fixing portion, the annular pressure plate and the sealing gasket and is embedded into the first fastening groove, thereby realizing the relative fixation of the anti-loosening gasket, the annular pressure plate, the sealing gasket and the valve plate, thereby improving the installation stability of the sealing gasket, reducing the possibility of loosening or deviation of the sealing gasket during application, and improving the sealing performance of the stop valve in the closed state.

[0021] Optionally, the fixing portion is bent in a direction away from the annular pressure plate and limits the outer end of the fixing pin.

[0022] By adopting the above technical solution, after the fixing pin is installed, a tool is used to bend the fixing part in a direction away from the annular pressure plate so that it limits the outer end of the fixing pin, thereby reducing the possibility of the fixing pin falling out of the first through hole and the first fastening groove in a natural state.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the setting of the connection structure, the two contact surfaces of the valve stem and the valve disc can fit tightly, and the limitation of the length direction of the axis is realized through the sliding cooperation of the fixing block and the fixing groove. The valve disc and the valve stem are circumferentially limited and fixed by the limiting ring, so that the valve stem and the valve disc form a stable combination; when the valve stem squeezes the valve disc and the valve disc squeezes the valve seat, force can be applied evenly, thereby reducing the problem of uneven force on the valve disc causing a gap between the valve disc and the valve seat, which in turn causes side leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 is a schematic cross-sectional structural diagram of an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the exploded structure of the embodiment of the present application showing the distribution of the connection assembly, the valve stem and the valve disc;

[0029] Figure 4 It is a partial cross-sectional structural schematic diagram of the installation and matching of the connection assembly in the embodiment of the present application;

[0030] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the sealing gasket installation cooperation embodied in the embodiment of the present application.

[0031] In the figure, 1, valve body; 11, flow channel; 12, valve seat; 121, positioning convex ring; 2, valve cover; 3, valve stem; 31, annular clearance groove; 4, actuator; 41, operating handle; 5, connecting structure; 51, fixing block; 511, sliding part; 512, transition part; 52, fixing groove; 521, sliding groove; 522, clearance notch; 53, limiting ring; 6, valve disc; 61, sealing groove; 611, first fastening groove; 62, fixing screw; 63, fixing nut; 64, fixing pin; 7, sealing gasket; 71, first fixing hole; 8, annular pressure plate; 81, second fixing hole; 9, anti-loosening gasket; 91, gasket body; 911, third fixing hole; 92, fixing part; 921, first through hole; 93, bending part. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0033] Example:

[0034] Reference Figure 1 and Figure 2 A high-sealing stop valve comprises a valve body 1 with a flow channel 11, a valve cover 2 installed on the valve body 1, a valve stem 3 penetrating the valve cover 2 and extending to the inside of the valve body 1, and a valve disc 6 connected to the valve stem 3 and located inside the valve body 1, and an actuator 4 is provided at the outer end of the valve stem 3, the actuator 4 is an operating handle 41, a valve seat 12 located below the valve disc 6 is provided inside the valve body 1, and an inlet and an outlet connected to the flow channel 11 are provided on opposite sides of the valve body 1; the valve stem 3 is threadedly matched with the valve cover 2, and the valve stem 3 is driven to rotate relative to the valve body 1 by rotating the operating handle 41, thereby adjusting the distance between the valve disc 6 and the valve seat 12, so as to control the opening and closing of the stop valve.

[0035] Reference Figure 2 and Figure 3 A connecting structure 5 is provided between the valve disc 6 and the valve stem 3, and a stable connection between the valve stem 3 and the valve disc 6 is achieved through the connecting structure 5; wherein the connecting structure 5 includes a fixing block 51 arranged on the valve stem 3, a fixing groove 52 and a limiting ring 53 opened on the valve disc 6, and the fixing block 51 is slidably arranged inside the fixing groove 52.

[0036] Reference Figure 3 and Figure 4 The fixed block 51 and the valve stem 3 are integrally formed by a milling machine. The fixed block 51 includes a sliding portion 511 and a transition portion 512, wherein the contour shape of the sliding portion 511 is a spherical ball, and the side of the fixed block 51 away from the valve stem 3 is a milled plane, and the fixed groove 52 includes a sliding groove 521 for the sliding portion 511 to slide in and a clearance notch 522 for the transition portion 512 to slide in; thereby, the initial limiting of the valve stem 3 and the valve disc 6 is achieved.

[0037] Reference Figure 3 and Figure 4 , one side of the valve disc 6 abuts against one end of the valve stem 3, and the limiting ring 53 is sleeved on the outer peripheral surface of the connection between the valve disc 6 and the valve stem 3; the outer edges of the sides where the valve stem 3 and the valve disc 6 are close to each other are provided with a limiting ring 53 for sleeved into an annular clearance groove 31, and the cross-sectional shape of the limiting ring 53 is circular, and the side wall of the annular clearance groove 31 is an arc surface adapted to the inner side of the limiting ring 53; after the fixing block 51 is slidably inserted into the fixing groove 52, the axis of the valve disc 6 and the valve stem 3 coincide with each other, and the surfaces close to each other are tightly fitted, and then the limiting ring 53 is sleeved inside the annular clearance groove 31, so as to limit the fixing block 51 located in the fixing groove 52, so as to avoid the dislocation or loosening of the assembled valve stem 3 and valve disc 6.

[0038] Reference Figure 4 and Figure 5 A sealing gasket 7 is installed on the side of the valve disc 6 away from the valve stem 3. The sealing gasket 7 is made of polytetrafluoroethylene, and a sealing groove 61 for inserting the sealing gasket 7 is opened in the middle of the side of the valve disc 6 away from the valve stem 3. A positioning convex ring 121 that can press tightly against the sealing gasket 7 is provided on the side edge of the valve seat 12 close to the valve disc 6; when the valve disc 6 closes the flow channel 11 in the valve body 1, the sealing gasket 7 on the valve disc 6 presses tightly against the positioning convex ring 121.

[0039] Reference Figure 4 A first fixing hole 71 is provided in the middle of the sealing gasket 7, and a fixing screw 62 penetrating the first fixing hole 71 is provided in the middle of the bottom side of the sealing groove 61 of the valve disc 6. The fixing screw 62 is integrally formed with the valve plate, and a fixing nut 63 for fastening the sealing gasket 7 is provided on the fixing screw 62; an annular pressure plate 8 is provided between the fixing nut 63 and the sealing gasket 7, and the annular pressure plate 8 is made of a rigid material, and a second fixing hole 81 for the fixing screw 62 to penetrate is provided on the annular pressure plate 8; at the same time, an anti-loosening gasket 9 is provided between the fixing nut 63 and the annular pressure plate 8, so as to reduce the loosening or deviation of the annular pressure plate 8, the fixing nut 63 and the sealing gasket 7 relative to the valve disc 6.

[0040] Reference Figure 4 and Figure 5 The anti-loosening gasket 9 includes a gasket body 91, a bent portion 93 arranged on the edge of one side of the gasket body 91, and a fixing portion 92 arranged on the edge of the other side of the gasket body 91, and the gasket body 91, the bent portion 93 and the fixing portion 92 are integrally formed, and a third fixing hole 911 for the fixing screw 62 to pass through is opened on the gasket body 91; the bent portion 93 is used to keep the gasket body 91 and the fixing nut 63 relatively fixed, and the fixing portion 92 is used to keep the gasket body 91, the annular pressure plate 8 and the sealing gasket 7 relatively fixed to the valve disc 6.

[0041] Reference Figure 4 and Figure 5 The bent portion 93 is bent toward the side away from the annular pressure plate 8, wherein one side of the bent portion 93 abuts against the outer side of the fixing nut 63, thereby realizing the relative fixation of the anti-loosening gasket 9 and the fixing nut 63; a fixing pin 64 is installed on the side of the valve disc 6, wherein the fixing portion 92, the annular pressure plate 8 and the sealing gasket 7 are coaxially provided with a first through hole 921 for the fixing pin 64, and the valve disc 6 is provided with a first fastening groove 611 coaxial with the first through hole 921 on the bottom side of the sealing groove 61, and the fixing pin 64 passes through the first through hole 921 on the fixing portion 92, the annular pressure plate 8 and the sealing gasket 7 and then is embedded in the first fastening groove 611, and the fixing portion 92 is bent in the direction away from the annular pressure plate 8, thereby limiting the fixing pin 64 and reducing the possibility of the fixing pin 64 escaping from the first through hole 921 and the first fastening groove 611 in a natural state.

[0042] The implementation principle of the embodiment of the present application is:

[0043] When the staff controls the on / off of the stop valve, the operating handle 41 is turned to drive the valve stem 3 to rotate relative to the valve body 1, thereby adjusting the distance between the valve disc 6 and the valve seat 12, so as to control the opening and closing of the stop valve; when the stop valve is in a closed state, the sealing gasket 7 on the valve disc 6 is tightly pressed against the positioning convex ring 121 on the valve seat 12, thereby ensuring the sealing performance of the stop valve when it is closed;

[0044] By setting the connecting structure 5, the two contact surfaces of the valve stem 3 and the valve disc 6 can fit tightly, so that the pressure of the valve stem 3 pressing the valve disc 6 is uniform, and the valve stem 3 and the valve disc 6 are limited in the axial length direction through the form of the fixing block 51 and the fixing groove 52, and the valve disc 6 and the valve stem 3 are circumferentially limited and fixed by the limiting ring 53, so that the valve stem 3 and the valve disc 6 form a stable combination; when the valve is closed, the valve stem 3 presses the valve disc 6, and the valve disc 6 presses the valve seat 12, and both can be evenly stressed, thereby reducing the problem of uneven stress on the valve disc 6 causing a gap between the valve disc 6 and the valve seat 12, thereby causing side leakage.

[0045] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-sealing stop valve, comprising a valve body (1) having a flow channel (11), a valve cover (2) mounted on the valve body (1), a valve stem (3) penetrating the valve cover (2) and extending into the interior of the valve body (1), and a valve flap (6) connected to the valve stem (3) and located inside the valve body (1), an actuator (4) being provided at the outer end of the valve stem (3), and a valve seat (12) being provided inside the valve body (1) and located below the valve flap (6); It is characterized in that A connecting structure (5) is provided between the valve flap (6) and the valve stem (3), and the connecting structure (5) comprises a fixing block (51) arranged on the valve stem (3), a fixing groove (52) opened on the valve flap (6), and a limiting ring (53); the fixing block (51) is slidably arranged inside the fixing groove (52), one side of the valve flap (6) is in contact with one end of the valve stem (3), and the limiting ring (53) is sleeved on the outer peripheral surface of the connection between the valve flap (6) and the valve stem (3).

2. A high sealing stop valve according to claim 1, characterized in that: The outer edges of the sides of the valve stem (3) and the valve flap (6) that are close to each other are both provided with an annular clearance groove (31) for the limiting ring (53) to be sleeved into.

3. A high sealing stop valve according to claim 1, characterized in that: A sealing gasket (7) is provided on the side of the valve flap (6) away from the valve stem (3); a sealing groove (61) for inserting the sealing gasket (7) is provided on the side of the valve flap (6) away from the valve stem (3); and a positioning convex ring (121) capable of tightly abutting against the sealing gasket (7) is provided on the side edge of the valve seat (12) close to the valve flap (6).

4. A high sealing stop valve according to claim 3, characterized in that: The sealing gasket (7) is provided with a first fixing hole (71), the valve flap (6) is provided with a fixing screw (62) penetrating the first fixing hole (71) at the bottom side of the sealing groove (61), and the fixing screw (62) is provided with a fixing nut (63) for fastening the sealing gasket (7).

5. A high sealing stop valve according to claim 4, characterized in that: An annular pressing plate (8) is provided between the fixing nut (63) and the sealing gasket (7), and a second fixing hole (81) for the fixing screw rod (62) to pass through is formed on the annular pressing plate (8).

6. A high sealing stop valve according to claim 5, characterized in that: An anti-loosening gasket (9) is provided between the fixing nut (63) and the annular pressure plate (8), and the anti-loosening gasket (9) comprises a gasket body (91), a bent portion (93) arranged at the edge of the gasket body (91), and a fixing portion (92) arranged at the edge of the gasket body (91); the bent portion (93) is used to keep the gasket body (91) and the fixing nut (63) relatively fixed, and the fixing portion (92) is used to keep the gasket body (91) and the valve flap (6) relatively fixed.

7. A high sealing stop valve according to claim 6, characterized in that: The bent portion (93) is bent toward a side away from the annular pressure plate (8), and one side of the bent portion (93) is in contact with an outer side surface of the fixing nut (63); A fixing pin (64) is provided on the side of the valve flap (6); a first through hole (921) for the fixing pin (64) is coaxially provided on the fixing portion (92), the annular pressure plate (8) and the sealing gasket (7); and a first fastening groove (611) for the fixing pin (64) to be embedded is provided on the bottom side of the sealing groove (61) of the valve flap (6).

8. A high sealing stop valve according to claim 7, characterized in that: The fixing portion (92) is bent in a direction away from the annular pressure plate (8) and limits the outer end of the fixing pin (64).

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