Quick closing extraction check valve

Abstract

The utility model discloses a quick -closing steam extraction check valve, including the valve body with the butterfly plate, still be equipped with the help closing jar on the valve body, the piston axle fixedly connected with piston rod of help closing jar, the piston rod is opposite the help closing department setting of butterfly plate, the help closing department includes the support frame and the gyro wheel of hinged in support frame, the support frame still is equipped with the bracket on the valve body, is installed the travel switch on the bracket, the travel switch is used for cooperation bracket trigger help closing jar's control, the utility model discloses a check valve through setting with gas or oil pressure's help closing jar, in the valve opening state, through the starting piston rod of help closing jar fast extension, promotes the butterfly plate to swing and the valve seat to cooperate the sealing valve body, thereby fastly closes the valve, and provides the thrust and keeps the sealed state continuously after closing.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a quick-closing steam extraction check valve. Background Technology

[0002] A check valve is a valve that automatically opens and closes its disc based on the flow of the medium itself to prevent backflow. It is also known as a non-return valve, one-way valve, backflow valve, and back pressure valve. Check valves are a type of automatic valve, primarily used to prevent backflow of the medium, prevent pump and drive motor reversal, and prevent the release of medium from containers. Traditional check valves can only be opened and closed by the medium itself and cannot be manually closed. In special circumstances, it is impossible to temporarily close the check valve. Utility Model Content

[0003] In view of the prior art, the purpose of this utility model is to provide a check valve with a booster cylinder that can quickly close the butterfly plate and maintain the closed position.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a quick-closing steam extraction check valve, comprising a valve body with a butterfly plate, and an auxiliary closing cylinder provided on the valve body. The piston shaft of the auxiliary closing cylinder is fixedly connected to a piston rod, and the piston rod is positioned opposite the auxiliary closing part provided on the butterfly plate. The auxiliary closing part includes a support frame and a roller hinged to the support frame. A bracket is also provided on the outside of the valve body, and a limit switch is installed on the bracket. The limit switch is used to cooperate with the bracket to trigger the control of the auxiliary closing cylinder.

[0005] As a further feature of the above solution, the piston rod is provided with a sealing top ring that matches the roller at one end located in the valve body.

[0006] As a further feature of the above solution, the front end of the sealing top ring is provided with an abutting plane, and the rear end is provided with a sealing cone that cooperates with the corresponding sealing inclined surface provided in the valve body.

[0007] As a further provision of the above scheme, the valve body includes a valve cover that is sealed to the valve body. The lower end of the valve cover extends into the valve body and has a packing groove and sealing packing on it. The sealing packing is installed by a gland.

[0008] As a further provision of the above scheme, the valve body is provided with a valve shaft, both ends of which are located on the valve body and are equipped with shaft end caps. The valve shaft is connected to a butterfly plate by a cylindrical pin. The butterfly plate swings along the valve shaft under the drive of the medium or piston rod. The shaft end cap is also provided with an opening gauge. An indicator needle is circumferentially fixed at the end of the valve shaft that extends out of the shaft end cap. The indicator needle drives the relative opening gauge to rotate through the valve shaft.

[0009] As a further feature of the above solution, the valve body is also provided with a valve seat, and the butterfly plate is provided with a sealing ring. The sealing ring is installed by a pressure ring that is fixed to the butterfly plate with bolts.

[0010] As a further feature of the above solution, the bracket has two sets of limit switches, and the piston rod has a shaft connecting sleeve.

[0011] Beneficial effects: The check valve of this utility model is equipped with a gas or oil pressure-assisted closing cylinder. When the valve is open, the piston rod of the assist closing cylinder extends quickly, pushing the butterfly plate to swing and cooperate with the valve seat to seal the valve body, thereby quickly closing the valve. After closing, it continues to provide thrust to maintain the sealing state. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the quick-closing steam extraction check valve of this utility model.

[0013] Figure 2 This is a schematic diagram of the assisted closing state of the quick-closing steam extraction check valve in this embodiment.

[0014] Figure 3 This is a schematic diagram showing the open state of the quick-closing steam extraction check valve in this embodiment.

[0015] Figure 4 This is the opening indicator of the quick-closing steam extraction check valve in this embodiment.

[0016] Reference numerals: 1. Auxiliary closing cylinder; 2. Bracket; 3. Piston rod; 4. Shaft connecting sleeve; 5. Limit switch; 6. Gland; 7. Sealing packing; 8. Shaft sleeve; 9. Valve cover; 10. Valve body; 11. Valve seat; 12. Sealing ring; 13. Pressure ring; 14. Butterfly plate; 15. Valve shaft; 16. Roller; 17. Cylindrical pin; 18. Shaft end cover; 19. Auxiliary closing part; 20. Support frame; 21. Piston shaft; 31. Sealing top ring; 32. Sealing cone; 34. Sealing bevel; 75. Indicator needle; 76. Opening gauge. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0018] like Figure 1-4The quick-closing steam extraction check valve shown includes a valve body 10 with a butterfly plate 14. The valve body 10 is also provided with a closing auxiliary cylinder 1. The piston shaft 21 of the closing auxiliary cylinder 1 is fixedly connected to a piston rod 3. The piston rod 3 is positioned opposite a closing auxiliary part 19 provided on the butterfly plate 14. The closing auxiliary part 19 includes a support frame 20 and a roller 16 hinged to the support frame 20. A bracket 2 is also provided on the outside of the valve body 10. A limit switch 5 is installed on the bracket 2. The limit switch 5 is used to cooperate with the bracket 2 to trigger the control of the closing auxiliary cylinder 1.

[0019] As a further provision of the above scheme, the piston rod 3 is provided with a sealing top ring 31 matching the roller 16 at one end inside the valve body 10. The front end of the sealing top ring 31 is provided with an abutment plane, and the rear end is provided with a sealing cone 32 that cooperates with the sealing inclined surface 34 correspondingly provided inside the valve body 10. The sealing top ring 31 and the piston rod 3 are integrally formed and match the sealing inclined surface 34. When the valve opening medium pipeline is filled with steam, it cooperates with the sealing packing 7 to form a double seal. Furthermore, the taper of the sealing inclined surface 34 is matched with the sealing top ring 31, and the position of the upper limit switch 5 is opposite to the rising position of the sealing top ring 31. After the upper limit switch 5 is triggered, the auxiliary closing cylinder 1 performs the work of maintaining the pressure balance inside the cylinder.

[0020] As a further provision of the above scheme, the valve body 10 includes a valve cover 9 which is sealed and installed with the valve body 10. The lower end of the valve cover 9 extends into the valve body 10, and a packing groove 71 and a sealing packing 7 are provided on it. The sealing packing 7 is installed by a pressure cap 6.

[0021] As a further provision of the above scheme, the valve body 10 is provided with a valve shaft 15. Both ends of the valve shaft 15 are located on the valve body 10 and are provided with shaft end caps 18. The valve shaft 15 is connected to the butterfly plate 14 by a cylindrical pin 17. The butterfly plate 14 is hinged and swings along the valve shaft 15 under the drive of the medium or the piston rod 3. The shaft end cap 18 is also provided with an opening gauge 76. The end of the valve shaft 15 extending out of the shaft end cap 18 is circumferentially fixed with an indicator needle 75. The indicator needle 75 drives the relative opening gauge 76 to rotate through the valve shaft 15.

[0022] As described above, in this embodiment, the valve shaft 15 used for the butterfly plate 14 is connected to both ends by indicator needles 75. The valve shaft 15 itself passes through the valve body 10. A shaft end cover 18 is provided on the valve body 10 for sealing and is axially fixed relative to the shaft end cover 18. Its end extends out of the shaft end cover 18 and is circumferentially linked to it. The indicator needles 75 are rotated on the opening scale 76 provided on the shaft end cover 18. The real-time opening degree of the butterfly plate 14 can be directly read from the indicator needles 75 and the opening scale 76 on both sides. The operator can quickly obtain the opening and closing status of the butterfly plate 14 inside the valve body 10.

[0023] As a further provision of the above scheme, the valve body 10 is also provided with a valve seat 11, and the butterfly plate 14 is provided with a sealing ring 12. The sealing ring 12 is installed by a pressure ring 13 that is fixed to the butterfly plate 14 with bolts.

[0024] As a further feature of the above scheme, the limit switch 5 on the bracket 2 is provided in two sets, the piston rod 3 is provided with a shaft connecting sleeve 4, and a shaft sleeve 8 is also provided between the piston rod 3 and the valve cover 9.

[0025] refer to Figure 1 The quick-closing steam extraction check valve of this embodiment includes a valve body 10 with a butterfly plate 14. The valve body 10 also has an auxiliary closing cylinder 1. The piston shaft 21 of the auxiliary closing cylinder 1 is locked to a piston rod 3 via a shaft coupling sleeve 4. The piston rod 3 is moved up and down by the piston shaft 21 of the auxiliary closing cylinder 1, thus pushing and holding the butterfly plate 14 to close the valve. The piston rod 3 is positioned opposite an auxiliary closing part 19 on the butterfly plate 14. The auxiliary closing part 19 includes a support frame 20 and rollers 16 hinged to the support frame 20. A bracket 2 is also provided on the outside of the valve body 10. Two sets of limit switches 5 are installed on the bracket 2. The two sets of limit switches 5 are located at the two ends of the butterfly plate 14. The limit switches 5 are used to cooperate with the auxiliary closing cylinder 1 to control the extension and retraction of the piston rod 3 to drive the butterfly plate 14. That is, upon receiving a command to quickly close the valve, the auxiliary closing cylinder 1 starts, the piston shaft 21 drives the piston rod 3 to quickly extend, pushing the butterfly plate 14 downward to close the valve. Figure 2 In the current state, when the butterfly plate 14 and valve seat 11 are closed, the lower limit switch 5 is triggered, and the state of the auxiliary closing cylinder 1 switches to maintain pressure or disconnects the gas supply after a delay. In this state, there is no steam pressure at both ends of the valve, therefore, there will be no problem of the butterfly plate 14 being pushed and oscillating. Figure 2 After steam enters the valve on the right side, the auxiliary cylinder 1 receives a command and restarts the piston rod 3 to move upward to release the top pressure of the butterfly plate 14. The butterfly plate 14 is pushed upward by the steam pressure, while the piston rod 3 moves until it triggers the upper limit switch 5, and then stops working. At this time, the sealing top ring 31 at the front end of the piston rod 3 cooperates with the sealing inclined surface 34 in the valve body 10, and with the double sealing design of the sealing packing 7, the pipeline and the flow channel in the valve body 10 are filled with steam and other media. The double sealing isolation improves the sealing retention under the pressure difference between the inside and outside.

[0026] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A quick-closing steam extraction check valve, comprising a valve body (10) with a butterfly plate (14), characterized in that: The valve body (10) is also provided with an auxiliary closing cylinder (1). The piston shaft (21) of the auxiliary closing cylinder (1) is fixedly connected to a piston rod (3). The piston rod (3) is positioned opposite the auxiliary closing part (19) provided on the butterfly plate (14). The auxiliary closing part (19) includes a support frame (20) and a roller (16) hinged on the support frame (20). The valve body (10) is also provided with a bracket (2) on the outside. A limit switch (5) is installed on the bracket (2). The limit switch (5) is used to cooperate with the bracket (2) to trigger the control of the auxiliary closing cylinder (1).

2. The quick-closing steam extraction check valve according to claim 1, characterized in that: The piston rod (3) is provided with a sealing top ring (31) matching the roller (16) at one end inside the valve body (10).

3. The quick-closing steam extraction check valve according to claim 2, characterized in that: The front end of the sealing top ring (31) is provided with an abutting plane, and the rear end is provided with a sealing cone (32) that cooperates with the corresponding sealing inclined surface (34) provided in the valve body (10).

4. The quick-closing steam extraction check valve according to claim 1, characterized in that: The valve body (10) includes a valve cover (9) that is sealed to the valve body (10). The lower end of the valve cover (9) extends into the valve body (10) and is provided with a packing groove (71) and a sealing packing (7). The sealing packing (7) is installed by a gland (6).

5. A quick-closing steam extraction check valve according to claim 1, characterized in that: The valve body (10) is provided with a valve shaft (15). Both ends of the valve shaft (15) are located on the valve body (10) and are provided with shaft end caps (18). The valve shaft (15) is connected to the butterfly plate (14) by setting a cylindrical pin (17). The butterfly plate (14) swings along the valve shaft (15) under the drive of the medium or piston rod (3).

6. A quick-closing steam extraction check valve according to claim 5, characterized in that: The shaft end cover (18) is also provided with an opening gauge (76). The end of the valve shaft (15) extending out of the shaft end cover (18) is circumferentially fixed with an indicator needle (75). The indicator needle (75) drives the relative opening gauge (76) to rotate through the valve shaft (15).

7. A quick-closing steam extraction check valve according to claim 1, characterized in that: The valve body (10) is also provided with a valve seat (11), and the butterfly plate (14) is provided with a sealing ring (12). The sealing ring (12) is installed by a pressure ring (13) that is fixed to the butterfly plate (14) with bolts.

8. A quick-closing steam extraction check valve according to claim 1, characterized in that: The bracket (2) has two sets of limit switches (5), and the piston rod (3) has a shaft connecting sleeve (4).

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