Stop-check valve

Abstract

Disclosed in the present application is a stop-check valve, comprising a valve body, a valve disc and a locking mechanism. A fluid passage is defined in the valve body. The valve disc is disposed in the fluid passage and has a rotatable state and a non-rotatable state. The locking mechanism is disposed in the fluid passage and has a locked position in which the locking mechanism is capable of locking the valve disc to keep same in the non-rotatable state, and a released position in which the locking mechanism is capable of releasing the valve disc to allow same to be in the rotatable state. The stop-check valve of the present application is provided with the valve disc and the locking mechanism that rotate around a common axis, such that the stop-check valve can realize the functions of both a stop valve and a swing check valve.

Description

Stop check valve Technical Field

[0001] This application relates to the field of fluid machinery equipment, and in particular to a shut-off check valve. Background Technology

[0002] A swing check valve is a commonly used type of check valve that consists of a rotatable valve disc. The disc rotates due to its own weight and the pressure difference between the fluid inlet and outlet to allow unidirectional flow of fluid. Swing check valves are typically used in conjunction with gate valves to block fluid flow when necessary. Summary of the Invention

[0003] This application provides a shut-off check valve, including a valve body, a valve disc, and a locking mechanism. A fluid passage is defined within the valve body. The valve disc is disposed within the fluid passage and has a rotatable state and a non-rotatable state. The locking mechanism is disposed within the fluid passage and has a locked position and a released position. The locking mechanism is configured to lock the valve disc in a non-rotatable state when in the locked position, and to release the valve disc in a rotatable state when in the released position.

[0004] Based on the above, the valve body has a valve inlet and a valve outlet, which are fluidly connected through the fluid channel. The valve disc has an open position and a closed position. When the valve disc is rotatable, it rotates between the open and closed positions based on the pressure difference between the valve inlet and the valve outlet, allowing fluid to flow unidirectionally from the valve inlet through the fluid channel to the valve outlet. When the valve disc is non-rotatable, it is in the closed position.

[0005] According to the above, the locking mechanism is disposed on the rear side of the valve disc. The valve body has a limiting portion located on the front side of the valve disc. When the locking mechanism is in the locked position, it abuts against the valve disc, so that the limiting portion and the locking mechanism together hold the valve disc in the closed position and prevent the valve disc from rotating.

[0006] According to the above, the shut-off check valve includes a valve disc sealing ring, which is disposed on the limiting portion or the valve disc, such that when the valve disc is in the valve disc closed position, the valve disc sealing ring is sealingly connected between the limiting portion and the valve disc.

[0007] According to the above, the locking mechanism also has an intermediate position and a first movement stroke and a second movement stroke. The locking mechanism is configured to rotate from the release position in the first movement stroke to the intermediate position, and then move linearly from the intermediate position in the second movement stroke until it reaches the locking position.

[0008] According to the above, the shut-off check valve further includes a valve shaft. The valve disc is connected to the valve shaft and is configured to rotate about the valve shaft between a valve disc open position and a valve disc closed position. The locking mechanism includes an elongated orifice through which the valve shaft passes, and the locking mechanism is configured to rotate about the valve shaft during a first stroke and move linearly relative to the valve shaft along the elongated orifice during a second stroke.

[0009] According to the above, the locking mechanism further includes an elastic component disposed in the elongated hole and configured to apply a preload force to the valve shaft along the length direction of the elongated hole.

[0010] According to the above, the locking mechanism further includes a slider disposed in the elongated hole and located between the elastic member and the valve shaft. The top of the slider abuts against the elastic member, and the bottom of the slider includes a notch for receiving the valve shaft.

[0011] According to the above, the locking mechanism further includes a valve stem and a connecting block. The valve stem is capable of abutting against the valve disc. The connecting block is connected above the valve stem, and the valve stem moves together with the connecting block, wherein the elongated hole is provided in the connecting block.

[0012] According to the above, the inner wall of the valve body has a limiting hole that extends radially. Specifically, the limiting hole is configured such that, during the second stroke of the locking mechanism, the bottom end of the valve stem is at least partially inserted into the limiting hole.

[0013] Based on the above, the valve disc includes a disc portion, a protrusion, and a connecting rod. The protrusion is located on the rear side of the disc portion and is configured to abut against the valve stem of the locking mechanism. The connecting rod connects the protrusion and the valve shaft, so that rotation of the valve shaft can drive the valve disc to rotate.

[0014] According to the above, the bottom end of the valve stem has a bevel that extends forward at an angle from top to bottom. The locking mechanism is configured such that, when the locking mechanism reaches its locked position, the bevel contacts the top of the wall of the limiting hole, causing the valve disc sealing ring to press against the limiting portion of the valve body and the valve disc.

[0015] Based on the above, the shut-off check valve further includes a handwheel assembly and a transmission mechanism. The handwheel assembly is connected to the valve body and is at least partially located outside the fluid passage; the handwheel assembly is rotatable. The transmission mechanism is located within the fluid passage and drives the connecting block of the handwheel assembly and the locking mechanism to drive the locking mechanism to move through the rotation of the handwheel assembly.

[0016] According to the above, the transmission mechanism includes a handwheel toothed portion and a locking mechanism toothed portion that mesh with each other. The handwheel toothed portion is disposed on the handwheel device, and the locking mechanism toothed portion is disposed on the connecting block of the locking mechanism.

[0017] Based on the above, the handwheel teeth and the locking mechanism teeth are configured to drive the locking mechanism teeth to move through the rotational, lifting, or helical motion of the handwheel teeth.

[0018] Other objects and advantages of this application will become apparent from the following description of the application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the application. Attached Figure Description

[0019] Figure 1A is a perspective structural diagram of a shut-off check valve according to an embodiment of this application;

[0020] Figure 1B is a partial exploded view of the shut-off check valve shown in Figure 1A;

[0021] Figure 2A is an exploded view of the locking mechanism, handwheel device and transmission mechanism in Figure 1B;

[0022] Figure 2B is a cross-sectional view of the locking mechanism, handwheel device and transmission mechanism shown in Figure 2A;

[0023] Figure 3A shows a cross-sectional view of the shut-off check valve when the locking mechanism is in the released position and the valve disc is in the valve disc open position;

[0024] Figure 3B shows a cross-sectional view of the stop check valve when the locking mechanism is in the middle position and the valve disc is in the valve disc closed position;

[0025] Figure 3C shows a cross-sectional view of the shut-off check valve when the locking mechanism is in the locked position and the valve disc is in the valve disc closed position;

[0026] Figure 4A shows a perspective view of the handwheel device, transmission mechanism and locking mechanism in a shut-off check valve according to another embodiment of this application;

[0027] Figure 4B shows an exploded view of the handwheel device, transmission mechanism, and locking mechanism shown in Figure 4A;

[0028] Figure 4C shows a cross-sectional view of the handwheel device, transmission mechanism, and locking mechanism shown in Figure 4A;

[0029] Figure 5 shows a perspective view of the handwheel device, transmission mechanism and locking mechanism in a shut-off check valve according to another embodiment of the present application. Detailed Implementation

[0030] Various specific embodiments of the present invention will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "top," and "bottom," are used herein to describe various exemplary structural parts and elements, their use is merely for ease of description and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed herein can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0031] Figures 1A and 1B illustrate the specific structure of a shut-off check valve 100 according to an embodiment of this application. Figure 1A shows a perspective view of the shut-off check valve 100, illustrating its general structure. Figure 1B shows a partially exploded view of the shut-off check valve 100, illustrating its internal components. As shown in Figures 1A and 1B, the shut-off check valve 100 includes a valve body 101 having a valve inlet 102 and a valve outlet 103, and defining a fluid passage 108 therein. The valve body 101 is generally cylindrical with openings at both ends; the opening on its left side forms the valve inlet 102, and the opening on its right side forms the valve outlet 103. The fluid passage 108 provides fluid communication between the valve inlet 102 and the valve outlet 103. The shut-off check valve 100 also includes a valve disc 110, which is rotatably disposed within the fluid passage 108. In this application, the valve disc 110 has a rotatable state and a non-rotatable state. When valve disc 110 is in a rotatable state, it can rotate to open or close fluid passage 108. When valve disc 110 is in a non-rotatable state, it is held in a position that closes fluid passage 108. Specifically, valve disc 110 has an open position (see Figure 3A) and a closed position (see Figure 3B). When valve disc 110 is in the open position, it is generally parallel to the extension direction of fluid passage 108 or at an angle of less than 90° to fluid passage 108, so as not to obstruct or completely obstruct fluid flow through fluid passage 108. When valve disc 110 is in the closed position, it is generally perpendicular to the extension direction of fluid passage 108, thus closing fluid passage 108 and preventing fluid from flowing through it. Furthermore, when the valve disc 110 is in a rotatable state, it can rotate between an open position and a closed position based on the pressure difference of the fluid between the valve inlet 102 and the valve outlet 103. This allows fluid to flow unidirectionally from the valve inlet 102 through the fluid passage 108 to the valve outlet 103, or prevents fluid from flowing in the fluid passage 108. When the valve disc 110 is in a non-rotatable state, it is held in the closed position to disconnect the fluid passage 108.

[0032] In this application, the shut-off check valve 100 also includes a locking mechanism 120. The locking mechanism 120 is also disposed in the fluid passage 108 and has a locked position and a released position. When the locking mechanism 120 is in the locked position, it locks the valve disc 110, keeping it in a non-rotatable state and in the valve disc closed position, thereby disconnecting the fluid passage 108. When the locking mechanism 120 is in the released position, it releases the valve disc 110, allowing it to rotate, and the locking mechanism 120 does not obstruct the rotation of the valve disc 110. As an example, the locking mechanism 120 is disposed on the rear side of the valve disc 110, i.e., the right side in FIG1B. A limiting portion 305 (see FIG3A) is provided on the inner wall of the valve body 101, and the limiting portion 305 is disposed on the front side of the valve disc 110. When the locking mechanism 120 is in the locked position (see Figure 3C), the locking mechanism 120 abuts against the valve disc 110 from the rear, so that the limiting part 305 and the locking mechanism 120 together hold the valve disc 110 in the closed position and prevent the valve disc 110 from rotating. When the locking mechanism 120 is in the released position (see Figure 3A), the locking mechanism 120 is retracted into the fluid passage 108 at the top of the valve body 101 and is approximately parallel to the extending direction of the fluid passage 108, thus not hindering the rotation of the valve disc 110. At this time, the valve disc 110 can rotate between the valve disc open position and the valve disc closed position based on the pressure difference of the fluid between the valve inlet 102 and the valve outlet 103.

[0033] In this embodiment, the locking mechanism 120 also has an intermediate position (see FIG. 3B), a first movement stroke, and a second movement stroke. The locking mechanism 120 rotates from the release position during the first movement stroke to reach the intermediate position (i.e., rotates counterclockwise from the release position shown in FIG. 3A to reach the intermediate position shown in FIG. 3B). Furthermore, the locking mechanism 120 moves linearly from the intermediate position during the second movement stroke to reach the locked position (i.e., moves downwards from the intermediate position shown in FIG. 3B to reach the locked position shown in FIG. 3C). When the locking mechanism 120 is in the locked position, the bottom end of the locking mechanism 120 can at least partially insert into the limiting hole 306 (see FIG. 3A-3C) on the inner wall of the valve body 101, thus locking the locking mechanism 120 and holding the valve disc 110 in the closed position.

[0034] In this embodiment, the shut-off check valve 100 further includes a valve disc sealing ring 118. The valve disc sealing ring 118 is annular and is disposed around the outer edge of the valve disc 110 or the limiting portion 305, so that when the valve disc 110 is in the valve disc closed position and the locking mechanism 120 is in the locked position, the valve disc sealing ring 118 can be sealed between the valve disc 110 and the limiting portion 305, thereby ensuring the sealing effect of disconnecting the fluid passage 108. In some specific embodiments, the bottom end of the locking mechanism 120 has a bevel 123. The bevel 123 extends obliquely forward from top to bottom. When the locking mechanism 120 is in the locked position, the bevel 123 is used to contact the top of the hole wall of the limiting hole 306, so that the valve disc sealing ring 118 presses against the limiting portion 305 of the valve body 101 and the valve disc 110.

[0035] More specifically, the locking mechanism 120 includes a valve stem 121 and a connecting block 122. The valve stem 121 is disposed substantially vertically in the fluid passage 108 and is used to abut against the rear side of the valve disc 110 (i.e., the right side in FIG. 1B) to restrict the rotation of the valve disc 110 at certain specific times. For example, when the valve disc 110 is in the valve closed position, the valve stem 121 can restrict the rotation of the valve disc 110 in the direction of the valve open position. The connecting block 122 is connected above the valve stem 121 for engaging with the power unit so that the operator can control the movement of the valve stem 121 through the connecting block 122, thereby restricting the rotation of the valve disc 110. A ramp 123 is disposed on the rear side of the bottom end of the valve stem 121.

[0036] In this embodiment, the shut-off check valve 100 further includes a handwheel device 150 and a transmission mechanism 160. The handwheel device 150 is at least partially connected to the outside of the valve body 101, so that an operator can operate the handwheel device 150 from outside the valve body 101. In this embodiment, the operator can turn the handwheel device 150 to rotate it.

[0037] The transmission mechanism 160 includes a handwheel tooth 264 and a locking mechanism tooth 263. The handwheel tooth 264 is located at the bottom of the handwheel assembly 150. The locking mechanism tooth 263 is located on the circumferential edge of the connecting block 122 of the locking mechanism 120. The handwheel tooth 264 and the locking mechanism tooth 263 mesh with each other to form a worm gear structure. The rotation of the handwheel assembly 150 drives the handwheel tooth 264 to rotate, and the handwheel tooth 264 then drives the connecting block 122 to rotate via the locking mechanism tooth 263. A more detailed description of the structure of the handwheel assembly 150, the transmission mechanism 160, and the locking mechanism 120 will be provided in conjunction with Figures 2A and 2B. Although in this embodiment, the handwheel device 150 drives the connecting block 122 to rotate through rotational motion, in other embodiments, the handwheel device 150 may also drive the connecting block 122 to rotate through upward or downward motion (as shown in Figures 4A-4C), or the handwheel device 150 may drive the connecting block 122 to rotate through helical motion (as shown in Figure 5).

[0038] The check valve 100 also includes a valve shaft 128. A valve disc 110 is connected to the valve shaft 128 and is configured to rotate about the axis of the valve shaft 128 between a valve disc open position and a valve disc closed position. A connecting block 122 of the locking mechanism 120 is also connected to the valve shaft 128 and is configured to restrict the movement trajectory of the locking mechanism 120 via the valve shaft 128. In this embodiment, the valve shaft 128 is fixedly connected to the valve body 101 and therefore remains stationary relative to the valve body 101. The valve disc 110 rotates relative to the valve shaft 128. The connecting block 122 has an elongated hole 224, which is elongated and extends longitudinally. The valve shaft 128 passes through the elongated hole 224. Due to the shape limitation of the elongated hole 224, the valve shaft 128 can only rotate relative to the elongated hole 224 or move linearly along the elongated hole 224. Therefore, the locking mechanism 120 can only perform rotational movement in a first stroke or linear movement in a second stroke.

[0039] The valve disc 110 includes a disc portion 111, a protrusion 115, and a connecting rod 112. The disc portion 111 is disc-shaped, and its shape and size match the shape and size of the limiting portion 305 (see FIG. 3A) on the inner wall of the valve body 101. A valve disc sealing ring 118 is disposed around the edge of the disc portion 111 between the disc portion 111 and the limiting portion 305. The disc portion 111 is arranged generally parallel to the valve stem 121, for example, vertically connected in the fluid passage 108. The protrusion 115 protrudes rearward from the middle of the disc portion 111 and is used to abut against the locking mechanism 120, for example, against the valve stem 121 of the locking mechanism 120. The valve disc 110 is connected to the valve shaft 128 via the connecting rod 112. In this embodiment, the connecting rod 112 connects the protrusion 115 of the valve disc 110 and the valve shaft 128. The connecting rod 112 is configured in a suitable shape so that both the locking mechanism 120 and the valve disc 110 can be connected to the valve shaft 128, and the protrusion 115 of the valve disc 110 can abut against the valve stem 121 of the locking mechanism 120.

[0040] Figures 2A and 2B illustrate the more specific structure of the handwheel assembly 150, the transmission mechanism 160, and the locking mechanism 120. Figure 2A shows an exploded view of the handwheel assembly 150, the transmission mechanism 160, and the locking mechanism 120, and Figure 2B shows a cross-sectional view of the handwheel assembly 150, the transmission mechanism 160, and the locking mechanism 120. As shown in Figures 2A and 2B, the handwheel assembly 150 includes a wheel 256 and a lever 252. The wheel 256 is located outside the valve body 101 for operation by the operator. The lever 252 is connected to the wheel 256 via a nut 251 and passes through the valve body 101 into the fluid passage 108. A handwheel tooth 264 is located at the bottom of the lever 252 and is helical in shape to engage with the locking mechanism tooth 263 on the connecting block 122 of the locking mechanism 120. Those skilled in the art will understand that at least one sealing ring 253 may be provided at the connection between the valve body 101 and the stem 252. The sealing ring 253 is fitted over the middle of the stem 252 to prevent fluid in the fluid passage 108 from leaking to the outside of the valve body 101. In this embodiment, the handwheel device 150 only rotates relative to the valve body 101, but does not move up or down.

[0041] A locking mechanism 120 is disposed on the front side of the lever portion 252 of the handwheel device 150, such that the locking mechanism teeth 263 of the connecting block 122 meshes with the handwheel teeth 264. The connecting block 122 is approximately in the shape of a quarter gear, and the locking mechanism teeth 263 are disposed on the rim of the gear. In this embodiment, the locking mechanism 120 rotates approximately 90° in the first stroke, therefore the connecting block 122 is configured as approximately in the shape of a quarter gear. Depending on the stroke of the locking mechanism 120, the connecting block 122 may also be configured as other shapes. An elongated hole 224 penetrates the connecting block 122 along its thickness direction and extends longitudinally. To match the shape of the valve shaft 128, the end of the elongated hole 224 in the length direction is arc-shaped and penetrates the top of the connecting block 122. In this embodiment, the locking mechanism 120 further includes a top cover 227 and an elastic member 225. The elastic member 225 is disposed in the elongated hole 224, and the top cover 227 covers the top of the connecting block 122 to close the elongated hole 224 from the top. The elastic member 225 is connected below the top cover 227 and extends along the length of the elongated hole 224 to apply a preload force to the valve shaft 128 along the length of the elongated hole 224.

[0042] In this embodiment, the locking mechanism 120 further includes a slider 226, which is disposed in the elongated hole 224 and located above the valve shaft 128. The bottom of the slider 226 includes an arc-shaped notch 229. The notch 229 is configured to match the shape of the valve shaft 128 to accommodate the top of the valve shaft 128, meaning that the valve shaft 128 can be accommodated between the slider 226 and the bottom end of the elongated hole 224. The elastic member 225 is a spring, whose elastic deformation direction is consistent with the length direction of the elongated hole 224. The top end of the spring is connected to the top cover 227, and the bottom end of the spring is supported by the slider 226 to apply a preload force to the valve shaft 128 through the slider 226. This preload force can hold the valve shaft 128 in a predetermined position without loosening or rotating. Furthermore, since the spring elastically deforms along the length direction of the elongated hole 224, the spring can also guide the valve shaft 128 to move along the length direction of the elongated hole 224. In some embodiments, certain limiting structures may be provided at the edge of the elongated hole 224 to limit the movement direction of the valve shaft 128 and the slider 226.

[0043] Therefore, when the connecting block 122 rotates relative to the valve shaft 128, the elastic member 225 applies a preload force to the valve shaft 128 to hold the valve shaft 128 between the slider 226 and the bottom end of the elongated hole 224. When the connecting block 122 moves linearly downward relative to the valve shaft 128, the connecting block 122 applies pressure to the valve shaft 128 that can overcome the preload force of the elastic member 225, and the valve shaft 128 presses against the elastic member 225 so that the connecting block 122 moves downward relative to the valve shaft 128 along the length direction of the elongated hole 224.

[0044] The valve stem 121 of the locking mechanism 120 is connected below the connecting block 122. In this embodiment, the top of the valve stem 121 has a pair of bosses 232, which are sandwiched between the outer sides of a pair of sidewalls in the thickness direction of the connecting block 122. A pin 231 passes through the bosses 232 and the connecting block 122 to connect the valve stem 121 to the connecting block 122. In order to avoid the lever portion 252 of the handwheel device 150 when the locking mechanism 120 is rotated to the locked position, the valve stem 121 is configured with a corresponding shape. As a specific example, the top of the valve stem 121 has a pair of arches 233 that arch outward from the valve stem 121 to form a clearance hole 234 on the top of the valve stem 121. The clearance hole 234 is used to receive the lever portion 252 when the locking mechanism 120 is rotated to the locked position.

[0045] Thus, the handwheel device 150 can drive the locking mechanism 120 to move between the locked position and the released position via the transmission mechanism 160.

[0046] Figures 3A-3C show cross-sectional views of the shut-off check valve 100 during its opening and closing process. Figure 3A shows the shut-off check valve 100 with the locking mechanism 120 in the released position and the valve disc 110 in the valve disc open position. Figure 3B shows the shut-off check valve 100 with the locking mechanism 120 in the intermediate position and the valve disc 110 in the valve disc closed position. Figure 3C shows the shut-off check valve 100 with the locking mechanism 120 in the locked position and the valve disc 110 in the valve disc closed position.

[0047] As shown in Figure 3A, the locking mechanism 120 is in its released position and is housed at the top of the fluid passage 108. The lever 252 of the handwheel assembly 150 passes through the clearance hole 234 of the valve stem 121 so that the valve stem 121 of the locking mechanism 120 can be in a generally horizontal position, thus the locking mechanism 120 does not affect the rotational opening or closing of the valve disc 110. The valve shaft 128 is in the rightmost position in the elongated hole 224, i.e., the bottommost position shown in Figure 2B. The elastic member 225 is in its initial state, applying only a preload to the valve shaft 128 to prevent it from loosening. The handwheel teeth 264 on the handwheel assembly 150 engage with the rightmost tooth of the locking mechanism teeth 263 of the locking mechanism 120, i.e., the bottommost tooth shown in Figure 2B.

[0048] At this time, valve disc 110 is in a rotatable state, capable of rotating around the axis of valve shaft 128 based on the pressure difference between valve inlet 102 and valve outlet 103, between its open and closed positions. In the state shown in Figure 3A, valve disc 110 is in the open position. When the pressure difference between valve inlet 102 and valve outlet 103 is less than a preset threshold, valve disc 110 can rotate counterclockwise until it is blocked by limiting part 305. At this time, valve disc 110 can be in the closed position. Valve disc sealing ring 118 abuts between valve disc 110 and limiting part 305, sealingly disconnecting fluid passage 108.

[0049] When the operator rotates the handwheel device 150, the handwheel teeth 264 on the handwheel device 150 rotate accordingly, driving the connecting block 122 of the locking mechanism 120 to rotate through the locking mechanism teeth 263 that mesh with it. The connecting block 122 of the locking mechanism 120 drives the locking mechanism 120 to rotate counterclockwise. Since the valve stem 121 of the locking mechanism 120 can abut against the valve disc 110, regardless of whether the valve disc 110 is in the open or closed position, the locking mechanism 120 can push the valve disc 110 to rotate counterclockwise to the position shown in Figure 3B.

[0050] As shown in Figure 3B, the top teeth of the handwheel tooth 264 and the locking mechanism tooth 263, but not the very top teeth, remain engaged. When the locking mechanism 120 rotates to the intermediate position, the valve disc 110 reaches its closed position. At this time, the valve disc sealing ring 118 abuts between the valve disc 110 and the limiting part 305, sealingly disconnecting the fluid passage 108. The valve stem 121 abuts against the rear side of the valve disc 110, working together with the limiting part 305 to hold the valve disc 110 in its closed position.

[0051] The valve stem 121 of the locking mechanism 120 is positioned approximately vertically in the fluid passage 108, with the inclined surface 123 of the valve stem 121 aligned with the top of the wall of the limiting hole 306, but the valve stem 121 is not yet inserted into the limiting hole 306. The valve shaft 128 is positioned at its lowest point in the elongated hole 224. The elastic member 225 is in its initial state, applying preload only to the valve shaft 128.

[0052] When the operator continues to rotate the handwheel device 150, the handwheel teeth 264 on the handwheel device 150 rotate accordingly. At this time, since the valve disc 110 has already abutted against the limiting part 305, the locking mechanism 120 cannot continue to push the valve disc 110 to rotate counterclockwise. The connecting block 122 of the locking mechanism 120 is restricted by the direction of rotation and can only overcome the preload of the elastic member 225 to press the elastic member 225 upward to cause elastic deformation, so that the locking mechanism 120 moves downward to the position shown in Figure 3C.

[0053] As shown in Figure 3C, the topmost teeth of the handwheel tooth 264 and the locking mechanism tooth 263 mesh. When the locking mechanism 120 rotates to the locked position, the valve disc 110 remains in its closed position. At this time, the valve disc sealing ring 118 abuts between the valve disc 110 and the limiting part 305, sealingly disconnecting the fluid passage 108. The valve stem 121 abuts against the rear side of the valve disc 110, together with the limiting part 305, holding the valve disc 110 in its closed position. Because the locking mechanism 120 has reached its locked position, the valve disc 110 is in a non-rotatable state.

[0054] The valve stem 121 of the locking mechanism 120 is at least partially inserted downward into the limiting hole 306, preventing the locking mechanism 120 from moving backward (i.e., to the right in Figure 3C). The inclined surface 123 of the valve stem 121 contacts the top of the hole wall of the limiting hole 306, causing the valve stem 121 to generate a leftward force on the inclined surface 123 when moving downward, thereby enabling the valve disc sealing ring 118 to press against the valve disc 110 and the limiting part 305. Since the valve shaft 128 is fixed, the downward movement of the connecting block 122 causes the valve shaft 128 to move upward in the elongated hole 224, away from the bottom end of the elongated hole 224.

[0055] At this time, regardless of the pressure difference between the valve inlet 102 and the valve outlet 103, the locking mechanism 120 can keep the valve disc 110 in a non-rotatable state, so that the shut-off check valve 100 can be closed.

[0056] Figures 4A-4C illustrate the structure of the handwheel assembly 450, transmission mechanism 460, and locking mechanism 120 in another embodiment of the shut-off check valve. Figure 4A shows a perspective view of the handwheel assembly 450, transmission mechanism 460, and locking mechanism 120; Figure 4B shows an exploded view of Figure 4A; and Figure 4C shows a cross-sectional view of Figure 4A. The structure of the shut-off check valve in this embodiment is largely the same as that of the shut-off check valve 100, with the main difference being the structure of the handwheel assembly 450 and transmission mechanism 460. The structure on the valve body can be adjusted accordingly.

[0057] As shown in Figures 4A-4C, the handwheel device 450 also includes a wheel 456 and a lever 452, with the lever 452 connected below the wheel 456. The lever 452 includes a separable upper lever 474 and a lower lever 475. The upper lever 474 is fixedly connected to the wheel 456 and rotatably connected to the lower lever 475. Specifically, the bottom end of the upper lever 474 has a rotating boss 472 extending from its lower surface. The top of the lower lever 475 has a receiving groove 478, which is configured to accommodate the rotating boss 472, allowing it to rotate within it but preventing vertical displacement. The circumferential surface of the bottom of the upper lever 474 is also provided with helical teeth 471, and the circumferential surface of the lower lever 475 is provided with a vertically extending rib 473. Correspondingly, the connection between the valve body and the lever 452 of the handwheel device 450 is provided with helical teeth (not shown in the figure) that engage with the helical teeth 471, and a groove (not shown in the figure) extending linearly in the vertical direction. Thus, when the wheel 456 of the handwheel device 450 is rotated, the wheel 456 drives the upper lever 474 to rotate while simultaneously performing an upward or downward motion, i.e., a helical motion. The lower lever 475, constrained by the rib 473, cannot rotate and can only be driven by the upper lever 474 to perform an upward or downward motion.

[0058] The transmission mechanism 160 includes a handwheel tooth 464 and a locking mechanism tooth 463 that mesh with each other. The handwheel tooth 464 is disposed on the circumferential surface of the bottom of the lower lever 475 and is located on the side facing the connecting block 122 of the locking mechanism 120. Since the lower lever 475 does not need to rotate but only performs linear upward or downward movement, the handwheel tooth 464 does not need to cover the entire circumferential surface of the lower lever 475. In this embodiment, the structure of the locking mechanism tooth 463 is roughly the same as that of the locking mechanism tooth 263, except that the handwheel tooth 264 is rack-shaped. When the lower lever 475 moves upward or downward, the handwheel tooth 264 drives the locking mechanism tooth 463 to move by moving upward or downward, thereby driving the locking mechanism 120 to perform rotational and linear movement.

[0059] Figure 5 shows a perspective view of the handwheel device 550, transmission mechanism 560, and locking mechanism 120 in a shut-off check valve according to another embodiment. The structure of the shut-off check valve in this embodiment is roughly the same as that of the shut-off check valve 100, with the main difference being the structure of the handwheel device 550. The structure on the valve body can be set accordingly.

[0060] As shown in Figure 5, the handwheel device 550 includes a wheel 556 and a lever 552, with the lever 552 connected below the wheel 556. The transmission mechanism 560 has a structure largely the same as the transmission mechanism 160, also including a meshing handwheel tooth 564 and a locking mechanism tooth 563. In this embodiment, the lever 552 also has helical teeth 581, which are disposed on the circumferential surface of the lever 552 and located above the handwheel tooth 564. Correspondingly, a helical tooth (not shown in the figure) is provided at the connection between the valve body and the lever 552 to engage with the helical tooth 581. Thus, when the wheel 556 of the handwheel device 550 is rotated, the wheel 556 drives the lever 552 to rotate as a whole while also performing an upward or downward movement, i.e., a helical motion. When the lever 552 moves upward or downward, the handwheel tooth 564 drives the locking mechanism tooth 563 to move through the helical motion, thereby driving the locking mechanism 120 to perform rotational and linear motion.

[0061] The shut-off check valve of this application, by setting a valve disc that rotates around a common axis and a locking mechanism, enables the shut-off check valve to simultaneously perform the functions of a shut-off valve and a swing check valve.

[0062] When the locking mechanism of the check valve of this application is in the locked position, the valve disc is in the closed position and cannot be rotated. Since the valve stem of the locking mechanism abuts against the rear side of the valve disc, the fluid pressure between the valve inlet and outlet is mainly borne by the valve stem, and does not need to be borne by the valve disc. This not only ensures reliable pressure bearing function but also good pressure bearing capacity, guaranteeing the shut-off reliability of the check valve.

[0063] Furthermore, when the locking mechanism of the shut-off check valve is in the released position, the locking mechanism has almost no impact on the opening and closing function of the valve disc. Also, because the valve disc can rotate to open, the shut-off check valve can have a small pressure loss, i.e., a small fluid pressure drop between the valve inlet and outlet.

[0064] The shut-off check valve of this application has a simple structure and good applicability.

[0065] Although this disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or now or soon to be foreseen, will likely be apparent to those skilled in the art. Therefore, the examples of embodiments of this disclosure set forth above are intended to be illustrative rather than restrictive. Various changes can be made without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents. The technical effects and problems described in this specification are exemplary rather than restrictive. It should be noted that the embodiments described in this specification may have other technical effects and may solve other technical problems.

Claims

1. A stop check valve characterized by Comprising: a valve body (101) defining a fluid passage (108) therein; a valve disc (110) disposed in the fluid passage (108), the valve disc (110) having a rotatable state and a non-rotatable state; and a locking mechanism (120) disposed in the fluid passage (108) and having a locking position and a releasing position, the locking mechanism (120) being configured to lock the valve disc (110) to remain in the non-rotatable state when the locking mechanism (120) is in the locking position, and to release the valve disc (110) to be in the rotatable state when the locking mechanism (120) is in the releasing position.

2. The stop check valve according to claim 1, wherein: the valve body (101) has a valve inlet (102) and a valve outlet (103) in fluid communication through the fluid passage (108); the valve disc (110) has a valve disc open position and a valve disc closed position, wherein when the valve disc (110) is in the rotatable state, the valve disc (110) rotates between the valve disc open position and the valve disc closed position based on a pressure difference between the valve inlet (102) and the valve outlet (103) to allow fluid to flow from the valve inlet (102) through the fluid passage (108) to the valve outlet (103) in one direction; and when the valve disc (110) is in the non-rotatable state, the valve disc (110) is in the valve disc closed position.

3. The stop check valve according to claim 2, wherein: the locking mechanism (120) is disposed at a rear side of the valve disc (110); the valve body (101) has a stop portion (305) disposed at a front side of the valve disc (110); wherein when the locking mechanism (120) is in the locking position, the locking mechanism (120) abuts against the valve disc (110) such that the stop portion (305) and the locking mechanism (120) together hold the valve disc (110) in the valve disc closed position and restrict the valve disc (110) from rotating.

4. The stop check valve according to claim 3, wherein: the stop check valve (100) comprises a valve disc sealing ring (118) disposed on the stop portion (305) or the valve disc (110) such that when the valve disc (110) is in the valve disc closed position, the valve disc sealing ring (118) sealingly connects between the stop portion (305) and the valve disc (110).

5. The stop check valve according to claim 4, wherein: ​ The locking mechanism (120) also has an intermediate position and a first movement stroke and a second movement stroke, and is arranged to reach the intermediate position after rotating movement in the first movement stroke from the release position, and then linearly move from the intermediate position in the second movement stroke until reaching the locking position.

6. The shut-off check valve of claim 5, wherein Further comprising: a valve shaft (128); wherein the valve disc (110) is connected to the valve shaft (128) and is arranged to rotate around the valve shaft (128) between the valve disc open position and the valve disc closed position; wherein the locking mechanism (120) comprises a long slot (224) through which the valve shaft (128) passes, and the locking mechanism (120) is arranged to rotate around the valve shaft (128) in the first movement stroke and linearly move along the long slot (224) relative to the valve shaft (128) in the second movement stroke.

7. The stop check valve according to claim 6, wherein: the locking mechanism (120) further comprises a resilient member (225) arranged in the long slot (224) and arranged to apply a pre-tightening force to the valve shaft (128) along the length direction of the long slot (224).

8. The stop check valve according to claim 7, wherein: the locking mechanism (120) further comprises a slider (226) arranged in the long slot (224) and located between the resilient member (225) and the valve shaft (128), the top of the slider (226) abuts against the resilient member (225), and the bottom of the slider (226) comprises a notch (229) accommodating the valve shaft (128).

9. The stop check valve according to claim 8, wherein: the locking mechanism (120) further comprises a valve rod (121) capable of abutting against the valve disc (110); and a connecting block (122) connected above the valve rod (121), and the valve rod (121) and the connecting block (122) move together, wherein the long slot (224) is arranged in the connecting block (122).

10. The stop check valve according to claim 9, wherein: the inner wall of the valve body (101) has a limiting hole (306) extending in the radial direction; wherein the limiting hole (306) is arranged such that when the locking mechanism (120) is in the second movement stroke, the bottom end of the valve rod (121) is at least partially inserted into the limiting hole (306).

11. The stop check valve according to claim 10, wherein: the valve disc (110) comprises: a disc portion (111); a protruding part (115) disposed at the rear side of the disc part (111), the protruding part (115) being arranged to abut a valve stem (121) of the locking mechanism (120); and a connecting rod (112) connecting the protruding part (115) and the valve shaft (128) so that rotation of the valve shaft (128) can drive rotation of the valve disc (110).

12. The stop check valve according to claim 11, wherein: a bottom end of the valve stem (121) has a bevel (123) extending obliquely from top to bottom and forward; wherein the locking mechanism (120) is arranged so that, when the locking mechanism (120) reaches its locking position, the bevel (123) contacts a top of a hole wall of the limiting hole (306) so that the valve disc sealing ring (118) is pressed against the limiting part (305) of the valve body (101) and the valve disc (110).

13. The shut-off check valve of claim 9, wherein Further comprising: a hand wheel device (150, 450, 550) connected to the valve body (101) and at least partially located outside the fluid passage (108), the hand wheel device (150, 450, 550) being rotatable; and a transmission mechanism (160, 460, 560) located inside the fluid passage (108) and drivingly connected the hand wheel device (150, 450, 550) and the connecting block (122) of the locking mechanism (120) to drive the locking mechanism (120) to move by rotation of the hand wheel device (150, 450, 550).

14. The stop check valve according to claim 13, wherein: the transmission mechanism (160, 460, 560) comprises hand wheel tooth parts (264, 464, 564) and locking mechanism tooth parts (263, 463, 563) meshing with each other, the hand wheel tooth parts (264, 464, 564) being arranged on the hand wheel device (150, 450, 550), and the locking mechanism tooth parts (263, 463, 563) being arranged on the connecting block (122) of the locking mechanism (120).

15. The stop check valve according to claim 14, wherein: the hand wheel tooth parts (264, 464, 564) and the locking mechanism tooth parts (263, 463, 563) are arranged to drive the locking mechanism tooth parts (263, 463, 563) to move by rotational movement, lifting movement or screwing movement of the hand wheel tooth parts (264, 464, 564).

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