Non-flow-direction double-sealing non-return controllable isolating valve

Abstract

The utility model discloses a flow-direction-free double-seal check controllable isolating valve, which relates to the technical field of valves, and comprises a valve body, the valve body is centrosymmetric, the valve body is provided with a boss, the upper side and the lower side of the boss are respectively provided with a corrosion-resistant hardened layer, the boss divides a middle cavity of the valve body into an upper middle cavity and a lower middle cavity, the upper middle cavity is provided with a first valve clack, and the lower middle cavity is provided with a second valve clack. The upper end of the first valve clack is connected with an upper valve rod, the upper valve rod penetrates out of the valve body to be connected with an executing mechanism, a check assembly is arranged in the lower middle cavity, a pressing rod is arranged at the lower end of the first valve clack, and the pressing rod can abut against a valve clack of the check assembly along with downward movement of the first valve clack so that the valve clack of the check assembly can be separated from the lower side of the boss. When only the stop function is used, the stop check valve has no requirement for installation direction, is convenient to install, and when the stop function and the check function are used, the stop check valve is small in occupied space, dual-purpose and convenient to use and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a non-flow-direction double-sealed check controllable isolation valve. Background Art

[0002] An isolation valve is a valve that isolates pipeline fluids. It is mainly used for repairing and replacing pipeline equipment. In municipal pipe network systems such as water supply and drainage, fire protection, and sewage treatment, an isolation valve is generally installed at the water outlet of the water pump to cut off the medium during maintenance. The isolation valve has installation direction requirements during installation, which makes installation more inconvenient. Some pipelines will also be installed with a check valve to prevent water hammer caused by medium backflow from damaging equipment. However, installing and using two valves at the same time takes up a lot of space, is inconvenient to install, and is inconvenient to use and maintain. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a non-flow-direction double-seal check controllable isolation valve.

[0004] The technical solution provided by the utility model is:

[0005] A non-flow-direction double-seal check controllable isolation valve comprises a valve body, the valve body is centrally symmetrical, the valve body comprises a first medium flow chamber and a second medium flow chamber, the first medium flow chamber and the second medium flow chamber are connected through a middle chamber, a boss is provided in the middle of the middle chamber, and corrosion-resistant hardened layers are provided on both upper and lower sides of the boss, the boss divides the middle chamber into an upper middle chamber and a lower middle chamber, the upper middle chamber is provided with a first valve disc, the upper end of the first valve disc is connected to an upper valve stem, the upper valve stem passes through the valve body and is connected to an actuator, the lower middle chamber is provided with a check assembly, the check assembly comprises a second valve disc, a fixed seat, a lower valve stem, and a spring, the upper end of the lower valve stem is connected to the second valve disc, and the lower end is slidably connected to the fixed seat, the spring is sleeved on the outer side of the lower valve stem and the two ends respectively press the second valve disc and the fixed seat, the lower end of the first valve disc is provided with a pressure rod, the pressure rod can press the second valve disc as the first valve disc moves downward, so that the second valve disc is separated from the lower side of the boss.

[0006] The boss is provided with a guide cylinder for preventing the pressure rod from deviating.

[0007] The lower end of the pressure rod is hemispherical, and the upper end of the second valve flap is provided with a limiting hole matched with the hemispherical shape.

[0008] An upper valve cover and a lower valve cover are respectively arranged at the upper and lower ends of the valve body, and the upper valve cover and the lower valve cover are detachably connected to the valve body through bolts.

[0009] A sealing gasket is provided between the lower valve cover and the valve body.

[0010] A sealing gasket is arranged between the upper valve cover and the valve body, a packing assembly is arranged between the upper valve cover and the valve stem, and the packing assembly comprises packing and a packing gland, and the packing gland is threadedly connected to the upper valve cover to compress the packing.

[0011] A bracket is arranged between the valve body and the actuator, and an anti-rotation rod and an anti-rotation groove are arranged on the bracket. One end of the anti-rotation rod is inserted into the upper valve stem, and the other end is inserted into the anti-rotation groove.

[0012] The actuator is provided with a scale for indicating the movement distance of the upper valve stem.

[0013] The beneficial effects of the utility model are as follows: the utility model adopts a centrally symmetrical valve body, the valve body includes a first medium flow chamber and a second medium flow chamber, the first medium flow chamber and the second medium flow chamber are connected through a middle chamber, a boss is arranged in the middle of the valve body, and a first valve flap and a second valve flap which can be linked and can form a seal with the boss are arranged in the valve body, if the valve only needs a cut-off function, the installation can have no flow direction requirements, when the medium flows from the first medium flow chamber to the second medium flow chamber, the second valve flap plays a cut-off role, and the second valve flap can be controlled to open and close by controlling the first valve flap to move up and down; when the medium flows from the second medium flow chamber to the first medium flow chamber, the first valve flap plays a cut-off role, and the valve is opened and closed by controlling the first valve flap to move up and down, when the valve needs a cut-off and check function, the medium has a flow direction requirement, the medium flows from the second medium flow chamber to the first medium flow chamber, the first valve flap plays a cut-off role, and the second valve flap plays a check role, and the first valve flap can control the second valve flap by moving up and down, so that the check can be controlled, and the valve occupies a small space, has a dual purpose, and is easy to use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the valve body of an embodiment of the utility model. DETAILED DESCRIPTION

[0016] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1-2As shown, a non-flow direction double-seal check controllable isolation valve includes a valve body 3, which is centrally symmetrical. The valve body 3 includes a first medium flow cavity 21 and a second medium flow cavity 22. The first medium flow cavity 21 and the second medium flow cavity 22 are connected through a middle cavity 20, and the direction can be freely changed during installation. A boss 15 is provided in the middle of the middle cavity 20, and corrosion-resistant hardened layers are provided on both the upper and lower sides of the boss 15. The boss 15 divides the middle cavity into an upper middle cavity and a lower middle cavity. The upper middle cavity is provided with a first valve flap 6, and the upper end of the first valve flap 6 is connected to the upper valve stem 10 The upper valve stem 10 passes through the valve body 3 and is connected to the actuator 13. The lower middle cavity is provided with a check assembly, including a second valve disc 5, a fixed seat 18, a lower valve stem 17, and a spring 4. The upper end of the lower valve stem 17 is connected to the second valve disc 5, and the lower end is slidably connected to the fixed seat 18. The spring 4 is sleeved on the outer side of the lower valve stem 17 and the two ends press the second valve disc 5 and the fixed seat 18 respectively. A pressure rod 61 is provided at the lower end of the first valve disc 6. The pressure rod 61 moves downward with the first valve disc 6 to press the second valve disc 5, so that the second valve disc 5 is separated from the lower side of the boss 15.

[0018] When the valve only needs a cut-off function, the installation can be performed without flow direction requirements. When the medium flows from the first medium flow chamber 21 to the second medium flow chamber 22, the second valve flap 5 contacts the lower side of the boss 15 under the action of the spring 4 and the medium, and plays a cut-off role. When the valve needs to be opened, the first valve flap 6 can be controlled to move downward by rotating the actuator 13, and the pressure rod 61 moves downward with the first valve flap 6 to press the second valve flap 5, thereby opening the valve; the medium flows from the second medium flow chamber 22 to the first medium flow chamber 21, and the first valve flap 6 is controlled to move up and down by rotating the actuator 13, and the first valve flap 6 plays a cut-off role.

[0019] When the valve needs the check and cut-off functions, there are requirements for the installation direction. In the normal working state, the first valve flap 6 is located at the upper part of the upper middle cavity, the pressure rod 61 does not press the second valve flap 5, and the second valve flap 5 contacts the lower side of the boss 15 under the action of the spring 4 to form a seal. The medium flows from the second medium flow cavity 22 to the first medium flow cavity 21, and the second valve flap 5 plays a check role. When the medium needs to be cut off, the actuator 13 is rotated to move the first valve flap 6 downward, and the second valve flap 5 is pressed by the pressure rod 61 and moves downward synchronously until the lower end of the first valve flap 6 contacts the upper side of the boss 15 to form a seal. The first valve flap 6 plays a cut-off role. One valve can be used to achieve normal check and cut-off during maintenance. It is easy to switch, occupies a small space, and is easy to use and maintain.

[0020] In this embodiment, a guide cylinder 16 is provided at the boss 15, and the guide cylinder 16 provides guidance for the downward movement of the pressure rod 61 to prevent deviation. The lower end of the pressure rod 61 is hemispherical, and the upper end of the second valve flap 5 is provided with a limiting hole adapted to the hemispherical shape, which provides positioning for the pressure rod 61 to press against the second valve flap 5, ensuring that the second valve flap 5 is evenly stressed and moves downward stably.

[0021] In this embodiment, an upper valve cover 8 and a lower valve cover 1 are respectively provided at the upper and lower ends of the valve body 3. The upper valve cover 8 and the lower valve cover 1 are detachably connected to the valve body 3 by bolts, which is convenient for installation and maintenance. A sealing gasket 2 is provided between the lower valve cover 1 and the valve body 3, and a sealing gasket 7 is provided between the upper valve cover 8 and the valve body 3. The sealing gasket ensures that the medium at the fitting point between the valve cover and the valve body does not leak. A packing assembly is provided between the upper valve cover 8 and the valve stem 10, including packing 6 and a packing gland 14. The packing gland 14 is threadedly connected to the upper valve cover 8 to compress the packing 6. The packing assembly ensures that the medium at the fitting point between the valve cover and the upper valve stem does not leak, thereby improving the reliability of the valve sealing.

[0022] In this embodiment, a bracket 19 is provided between the valve body 3 and the actuator 13, and an anti-rotation rod 11 and an anti-rotation groove are provided on the bracket 19. One end of the anti-rotation rod 11 is inserted into the upper valve stem 10, and the other end is inserted into the anti-rotation groove. The anti-rotation structure can effectively prevent the upper valve stem 10 from rotating during the downward movement of the first valve flap 6, causing the sealing surface of the first valve flap 6 to deviate from the sealing surface on the upper side of the boss 15, thereby ensuring the reliability of the cut-off seal.

[0023] In this embodiment, a scale 12 for indicating the movement distance of the upper valve stem 10 is provided on the actuator 13. In some occasions where flow control is required, the first valve flap 6 can be half-opened according to the scale 12, so that the lower end of the first valve flap 6 does not contact the boss, and the upper end of the second valve flap 5 does not contact the boss, thereby maintaining the flow of the medium and controlling the flow.

[0024] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A non-flow double-seal check controllable isolation valve, comprising a valve body, characterized in that: The valve body is centrally symmetrical, and the valve body includes a first medium flow chamber and a second medium flow chamber, the first medium flow chamber and the second medium flow chamber are connected through a middle chamber, a boss is provided in the middle of the middle chamber, and corrosion-resistant hardened layers are provided on the upper and lower sides of the boss, the boss divides the middle chamber into an upper middle chamber and a lower middle chamber, the upper middle chamber is provided with a first valve disc, the upper end of the first valve disc is connected to an upper valve stem, the upper valve stem passes through the valve body and is connected to an actuator, the lower middle chamber is provided with a check assembly, the check assembly includes a second valve disc, a fixed seat, a lower valve stem, and a spring, the upper end of the lower valve stem is connected to the second valve disc, and the lower end is slidably connected to the fixed seat, the spring is sleeved on the outside of the lower valve stem and the two ends respectively press the second valve disc and the fixed seat, the lower end of the first valve disc is provided with a pressure rod, and the pressure rod can press the second valve disc as the first valve disc moves downward, so that the second valve disc is separated from the lower side of the boss.

2. A non-flow direction double-seal check controllable isolation valve according to claim 1, characterized in that: The boss is provided with a guide cylinder for preventing the pressure rod from deviating.

3. The non-flow-direction double-seal check controllable isolation valve according to claim 1, characterized in that: The lower end of the pressure rod is hemispherical, and the upper end of the second valve flap is provided with a limiting hole matched with the hemispherical shape.

4. The non-flow-direction double-seal check controllable isolation valve according to claim 1, characterized in that: An upper valve cover and a lower valve cover are respectively arranged at the upper and lower ends of the valve body, and the upper valve cover and the lower valve cover are detachably connected to the valve body through bolts.

5. A non-flow direction double-seal check controllable isolation valve according to claim 4, characterized in that: A sealing gasket is provided between the lower valve cover and the valve body.

6. The non-flow-direction double-seal check controllable isolation valve according to claim 4, characterized in that: A sealing gasket is arranged between the upper valve cover and the valve body, a packing assembly is arranged between the upper valve cover and the valve stem, and the packing assembly comprises packing and a packing gland, and the packing gland is threadedly connected to the upper valve cover to compress the packing.

7. The non-flow-direction double-seal check controllable isolation valve according to claim 1, characterized in that: A bracket is arranged between the valve body and the actuator, and an anti-rotation rod and an anti-rotation groove are arranged on the bracket. One end of the anti-rotation rod is inserted into the upper valve stem, and the other end is inserted into the anti-rotation groove.

8. The non-flow-direction double-seal check controllable isolation valve according to claim 1, characterized in that: The actuator is provided with a scale for indicating the movement distance of the upper valve stem.

Images