A gate valve with invisible anti-theft opening function

Abstract

The present invention discloses a gate valve with invisible anti-theft opening function, comprising a valve body, a valve cover connected to the valve body, a pressure cover connected to the valve cover and a valve stem that can rotate to control the upward and downward movement of a rubber plate, characterized in that: the valve stem comprises an upper valve stem and a lower valve stem, the lower valve stem is rotatably connected to the valve cover, the lower end of the lower valve stem is connected to the rubber plate, the upper end of the lower valve stem is provided with a first hole and a special-shaped groove communicating with the first hole, the first hole is coaxial with the lower valve stem, a spring is provided in the first hole, a connecting block is slidably provided in the special-shaped groove, and the spring acts on the connecting block; the upper valve stem is rotatably installed on the pressure cover through a pressure ring, a hand wheel is mounted on the upper valve stem, a second hole coaxial with the upper valve stem is provided on the upper valve stem, and a thread is provided in the middle of the second hole; the gate valve is consistent with an ordinary gate valve in appearance, can effectively reduce the risk of a special anti-theft valve installed being damaged by humans and opened by imitation special tools, and has high safety performance.

Description

Technical Field

[0001] The invention relates to a gate valve with an invisible anti-theft opening function, belonging to the technical field of valves. Background Art

[0002] The gate valve is a gate plate with a movement direction perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed. It does not vary with the gate parameters, usually 5°, and 2°52' when the medium temperature is not high. To improve its processability and compensate for the deviation of the sealing surface angle during the processing, this gate is called an elastic gate.

[0003] When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, only by the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves use forced sealing, that is, when the valve is closed, it is necessary to rely on external force to force the gate to press against the valve seat to ensure the sealing of the sealing surface.

[0004] Movement mode: The gate of the gate valve moves linearly with the valve stem, which is also called a rising stem gate valve. Usually, there is a trapezoidal thread on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When the valve is opened, when the gate lift height is equal to 1:1 times the valve diameter, the fluid channel is completely unblocked, but this position cannot be monitored during operation. In actual use, the top of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to consider the locking phenomenon caused by temperature changes, it is usually opened to the top position, and then back 1 / 2-1 turn as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e., the stroke). Some gate valve stem nuts are set on the gate, and the handwheel rotates to drive the valve stem to rotate, thereby lifting the gate. This valve is called a rotating stem gate valve or a concealed stem gate valve.

[0005] At present, the gate valves and valve anti-theft opening devices used in the water supply and drainage system all adopt mechanical structure design. Some are opened and closed by special mechanical tools, and some are equipped with magnetic lock devices and special opening tools. The valves of tap water magnetic lock devices with mechanical structure design can be seen at a glance from the appearance. The special opening tools have the disadvantages of being easy to imitate and easy to be damaged. Summary of the invention

[0006] The purpose of the present invention is to overcome the disadvantages in the prior art that the anti-theft opening device of the valve can be seen at a glance from the appearance, which leads to the special tools used being easy to be imitated and the valve being easy to be damaged, resulting in low safety of the gate valve, and to provide a gate valve with an invisible anti-theft opening function. The gate valve is consistent with an ordinary gate valve in appearance, can effectively reduce the risk of a special anti-theft valve being damaged by human beings and opened by imitation special tools, and has high safety performance.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The basic concept of the present invention is:

[0009] The gate valve with invisible anti-theft opening function includes a valve body, a sleeve, a limit screw, an O-ring, a rubber plate, a lower valve stem, a valve cover, a pressure cover, an upper valve stem, a spring, a connecting block, a pressure rod, and a handwheel; there are left and right valve seats on both sides of the valve body cavity that cooperate with the rubber plate, the valve stem nut and the rubber plate are fixedly connected as a whole, the lower valve stem is connected to the valve stem nut through a trapezoidal thread, the valve cover is connected to the valve body, and there is a rubber sealing ring in the middle for sealing, the upper end face of the valve cover is provided with a thrust bearing for fixing the lower valve stem, the valve cover is connected to the pressure cover, and there is a rubber sealing ring in the middle for sealing, the lower valve stem and the pressure cover are sealed with two O-rings, there is a hole in the middle of the upper end of the lower valve stem (the first hole), and a spring is installed in the hole, There is also a special-shaped groove in the middle of the upper end face of the lower valve stem, in which a connecting block is installed. There is also a special-shaped groove in the middle of the lower end of the upper valve stem, which is the same as the lower valve stem. The connecting block can move up and down in this groove. There is a hole in the middle of the upper valve stem (the second hole), and there is a thread in the middle section. The pressure rod is connected to the upper valve stem through the thread, and the upper valve stem is connected to the pressure cover through a pressure ring. The upper end of the upper valve stem is connected to the handwheel through a square, and the upper valve stem can be driven to rotate by rotating the handwheel; there is a thread on the top of the upper valve stem, and the hexagonal bolt is connected to the upper valve stem through a thread to press the handwheel. Under normal circumstances, the pressure rod presses the connecting block down. When the handwheel is rotated, the upper valve stem rotates, but the lower valve stem does not rotate together, and the valve cannot be opened and closed normally. When the operator operates the valve to open or close, he needs to remove the hexagonal bolt with a wrench, and use a special tool to rotate the pressure rod counterclockwise to move it upward. The connecting block moves upward under the action of the spring force and connects with the upper valve stem. At this time, the upper valve stem is driven to rotate by rotating the hand wheel, and the upper valve stem drives the lower valve stem to rotate through the connecting block. The lower valve stem drives the rubber plate up and down through the trapezoidal thread, thereby realizing the opening and closing of the valve. The sleeve connected to the valve body can slide along the outer wall, and is sealed with an O-ring. The sleeve is connected and limited by a limit screw and nut.

[0010] Specifically, the specific scheme of the present invention is as follows:

[0011] A gate valve with invisible anti-theft opening function, comprising a valve body, a valve cover connected to the valve body, a pressure cap connected to the valve cover, and a valve stem that can rotate to control the upward and downward movement of a rubber plate, characterized in that: the valve stem comprises an upper valve stem and a lower valve stem, the lower valve stem is rotatably connected to the valve cover, the lower end of the lower valve stem is connected to the rubber plate, the upper end of the lower valve stem is provided with a first hole and a special-shaped groove communicating with the first hole, the first hole is coaxial with the lower valve stem, a spring is provided in the first hole, a connecting block is slidably provided in the special-shaped groove, and the spring acts on the connecting block; The upper valve stem is rotatably installed on the pressure cover by a pressure ring, a handwheel is mounted on the upper valve stem, a second hole coaxial with the upper valve stem is provided on the upper valve stem, a thread is provided in the middle of the second hole, a first special-shaped groove is provided at the lower end of the upper valve stem, the first special-shaped groove is communicated with the second hole, the connecting block can move between the special-shaped groove and the first special-shaped groove, a pressure rod is provided in the second hole through a thread, the pressure rod can be screwed on or off by a special tool, a hexagonal bolt is threadedly connected to the end of the upper valve stem, and the hexagonal bolt is pressed on the handwheel after installation.

[0012] Wherein, the hand wheel is provided with an inner square, the upper valve stem is provided with an outer square, and the hand wheel is sleeved on the upper valve stem through the inner and outer squares.

[0013] Wherein, the upper end of the pressure rod is provided with a convex polygonal structure corresponding to the concave polygonal structure on the special tool.

[0014] Wherein, the special-shaped groove and the first special-shaped groove are polygonal grooves, and the connecting block matches the polygonal groove.

[0015] Further optimization is that a sleeve is coaxially sleeved at the left end inlet of the valve body. The sleeve can move left and right after being sleeved at the left end inlet of the valve body. An O-ring is provided between the valve body and the sleeve wall. The sleeve and the valve body are limited by a limit device.

[0016] Wherein, the limiting device includes a limiting screw and a nut, the limiting screw is a bolt, a limiting plate is provided on the valve body, the nut is fixed on the sleeve, and the bolt can be screwed with the nut after passing through the limiting plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention uses a special tool to disengage the connecting block between the upper and lower valve stems, and then installs a hexagonal bolt on the handwheel on the upper valve stem, so that the whole is no different from an ordinary gate valve, but the valve cannot be opened or closed by rotating the handwheel. Only after using a special tool to move the pressure rod so that the connecting block connects the upper and lower valve stems can the lower valve stem be rotated, and then the rubber plate is moved up and down to open and close the valve; only special management personnel can operate the gate valve, realizing effective management and preventing non-management personnel from operating it at will, which can effectively reduce the risk of special anti-theft valves being damaged by humans and opened by imitating special tools, and the safety performance of the gate valve is higher.

[0019] 2. The present invention provides a slidable sleeve at one end of the valve body and a limit device for limiting the sleeve, so that when the gate valve is in use, there is no need to add an expansion joint. The gate valve integrates the functions of the valve and the expansion joint, which reduces the cost of installation, replacement and maintenance. At the same time, during installation, it is only necessary to contact the other end of the sleeve and the gate valve with the pipe network, which is more convenient during installation and does not require several connections, that is, the expansion joint is incorporated into the pipe network, and the valve is incorporated into the pipe network;

[0020] More importantly, by providing a sliding sleeve, the stress generated by the thermal expansion and contraction of the valve can be effectively eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the special tool described in the present invention.

[0023] Figure 3 This is a schematic diagram of the overall structure of Example 2 of the present invention.

[0024] Figure numerals: 1 valve body, 2 rubber plate, 3 sleeve, 4 limit screw, 5 nut, 6 stem nut, 7 O-ring, 8 lower valve stem, 9 middle flange gasket, 10 valve cover, 11 hexagon socket screw, 12 special-shaped groove, 13 thrust bearing, 14 first special-shaped groove, 15 spring, 16 connecting block, 17 pressure ring, 18 pressure rod, 19 upper valve stem, 20 handwheel, 21 hexagon bolt, 22 special tool, 23 pressure cover, 24 connecting flange. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with embodiments, which are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in the field without creative work are all within the scope of protection of the present invention.

[0026] Example 1

[0027] A gate valve with invisible anti-theft opening function, comprising a valve body 1, a valve cover 10 connected to the valve body 1, a pressure cover 23 connected to the valve cover 10, and a valve stem that can rotate to control the upward and downward movement of a rubber plate 2; in this embodiment, the valve stem comprises an upper valve stem 19 and a lower valve stem 8, the lower valve stem 8 is rotatably connected to the valve cover 10, the lower end of the lower valve stem 8 is connected to the rubber plate 2, the upper end of the lower valve stem 8 is provided with a first hole and a special-shaped groove 12 communicating with the first hole, the first hole is coaxial with the lower valve stem 8, a spring 15 is provided in the first hole, a connecting block 16 is slidably provided in the special-shaped groove 12, and the spring 15 acts on the connecting block 16; the upper The valve stem 19 is rotatably installed on the pressure cover 23 through the pressure ring 17. A handwheel 20 is mounted on the upper valve stem 19. A second hole coaxial with the upper valve stem 19 is provided on the upper valve stem 19. A thread is provided in the middle of the second hole. A first special-shaped groove 14 is provided at the lower end of the upper valve stem 19. The first special-shaped groove 14 is communicated with the second hole. The connecting block 16 can move between the special-shaped groove 12 and the first special-shaped groove 14. A pressure rod 18 is provided in the second hole through a thread. The pressure rod 18 can be screwed on or off by a special tool 22. A hexagonal bolt 21 is threadedly connected to the end of the upper valve stem 19. After the hexagonal bolt 21 is installed, it is pressed on the handwheel 20.

[0028] In practice, the rubber plate 2 is located in the valve body 1, and the rubber plate 2 can cooperate with the left and right valve seats in the valve body 1 to achieve the sealing of the valve. The lower valve stem 8 is connected to the rubber plate 2 through the valve stem nut 6, wherein the lower valve stem 8 is connected to the valve stem nut 6 through a trapezoidal thread; the lower valve stem 8 is connected to the valve cover 10 through a thrust bearing 13, and an O-ring 7 is provided between the valve cover 10 and the pressure cover 23.

[0029] A middle flange gasket 9 is provided between the valve body 1 and the valve cover 10 ; the valve body 1 and the valve cover 10 are connected by means of hexagon socket screws 11 ; the gland 23 and the valve cover 10 are also connected by means of hexagon socket screws 11 .

[0030] Among them, the handwheel 20 is provided with an inner square, and the upper valve stem 19 is provided with an outer square. The handwheel 20 is mounted on the upper valve stem 19 through the inner and outer squares; the inner square is a square hole provided on the handwheel 20, and the outer square is a square part provided on the upper valve stem 19. The square part can cooperate with the square hole, thereby ensuring that when the handwheel 20 is rotated, the upper valve stem 19 can rotate with the handwheel 20.

[0031] The upper end of the pressure rod 18 is provided with a convex polygonal structure corresponding to the concave polygonal structure on the special tool 22, so that the pressure rod 18 can be rotated only by the special tool 22 with the concave polygonal structure to make the pressure rod 18 rise or fall.

[0032] Among them, the special-shaped groove 12 and the first special-shaped groove 14 are polygonal grooves, and the connecting block 16 matches the polygonal groove; in actual use, the special-shaped groove 12 and the first special-shaped groove 14 can be triangular grooves, quadrilateral grooves or pentagonal grooves; as long as the connecting block 16 is located in the special-shaped groove 12 and the first special-shaped groove 14 at the same time, the upper valve stem 19 and the lower valve stem 8 are connected, and when the upper valve stem 19 is rotated, the connecting block 16 transmits force to make the lower valve stem 8 rotate with the upper valve stem 19.

[0033] Thus, in actual use, since the pressure rod 18 can only be moved by a special tool 22, and at the same time, since the hexagonal bolt 21 is pressed on the hand wheel 20, the hand wheel 20 and the upper valve stem 19 are fixed, so that the appearance of the gate valve can be basically consistent with that of an ordinary valve; however, since the pressure rod 18 is set to push the connecting block 16 into the special-shaped groove 12, the connecting block 16 is disengaged from the first special-shaped groove 14, and the connecting block 16 reaches a balanced state under the action of the spring 15 and the pressure rod 18; thus, when the hand wheel 20 is turned, the upper valve stem 19 can be rotated, and at this time the lower valve stem 8 will not rotate. When the valve needs to be operated, first remove the hexagonal bolt 21, use the special tool 22 to rotate the pressure rod 18, so that the pressure rod 18 moves up, and at this time the connecting block 16 moves up to the first special-shaped groove 14 on the upper valve stem 19 under the action of the spring 15. At this time, the connecting block 16 is located in the special-shaped groove 12 and the first special-shaped groove 14; turn the hand wheel 20, and the upper valve stem 19 and the lower valve stem 8 can be rotated synchronously at the same time, so that the rubber plate 2 can be moved, and then the gate valve can be opened and closed.

[0034] Example 2

[0035] This embodiment is further optimized on the basis of embodiment 1. In this embodiment, a sleeve 3 is coaxially sleeved at the left inlet of the valve body 1. The sleeve 3 can move left and right after being sleeved on the left inlet of the valve body 1. An O-ring 7 is provided between the valve body 1 and the wall of the sleeve 3. The sleeve 3 and the valve body 1 are limited by a limit device.

[0036] Further optimized, the limiting device includes a limiting screw 4 and a nut 5, the limiting screw 4 is a bolt, a limiting plate is provided on the valve body 1, the nut 5 is fixed on the sleeve 3, and the bolt can be screwed together with the nut 5 after passing through the limiting plate.

[0037] In actual use, a connecting flange 24 is provided at the end of the sleeve 3 and the other end of the valve body 1 to facilitate access to the pipeline network.

Claims

1. A gate valve with invisible anti-theft opening function, comprising a valve body, a valve cover connected to the valve body, a gland connected to the valve cover, and a valve stem that can rotate to control the upward and downward movement of the rubber plate, characterized in that: The valve stem comprises an upper valve stem and a lower valve stem, the lower valve stem is rotatably connected to the valve cover, the lower end of the lower valve stem is connected to the rubber plate, the upper end of the lower valve stem is provided with a first hole and a special-shaped groove communicating with the first hole, the first hole is coaxial with the lower valve stem, a spring is provided in the first hole, a connecting block is slidably arranged in the special-shaped groove, and the spring acts on the connecting block; the upper valve stem is rotatably mounted on the gland through a pressing ring, a hand wheel is sleeved on the upper valve stem, a second hole coaxial with the upper valve stem is provided on the upper valve stem, a thread is provided in the middle of the second hole, a first special-shaped groove is provided at the lower end of the upper valve stem, the first special-shaped groove is communicated with the second hole, the connecting block can move between the special-shaped groove and the first special-shaped groove, a pressure rod is provided in the second hole through a thread, the pressure rod can be screwed up or down by a special tool, the end of the upper valve stem is threadedly connected with a hexagonal bolt, and the hexagonal bolt is pressed on the hand wheel after installation; The upper end of the pressure rod is provided with a convex polygonal structure corresponding to the concave polygonal structure on the special tool; The special-shaped groove and the first special-shaped groove are polygonal grooves, and the connecting block matches the polygonal groove.

2. A gate valve with invisible anti-theft opening function according to claim 1, characterized in that: The hand wheel is provided with an inner square, the upper valve stem is provided with an outer square, and the hand wheel is sleeved on the upper valve stem through the inner and outer squares.

3. A gate valve with invisible anti-theft opening function according to claim 1, characterized in that: A sleeve is coaxially sleeved at the left inlet of the valve body. The sleeve can move left and right after being sleeved at the left inlet of the valve body. An O-ring is provided between the valve body and the sleeve wall. The sleeve and the valve body are limited by a limiting device.

4. A gate valve with invisible anti-theft opening function according to claim 3, characterized in that: The limiting device includes a limiting screw and a nut. The limiting screw is a bolt. A limiting plate is provided on the valve body. The nut is fixed on the sleeve. The bolt can be screwed with the nut after passing through the limiting plate.

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