Control gate valve and its control system

Abstract

The present invention relates to a control gate valve, comprising a valve body, a valve seat is arranged in the valve body, a valve stem is arranged in the valve body, a pneumatic pilot valve is arranged between the valve body and an external flow channel, a gland is sleeved below the valve stem, the valve stem is connected to a wedge block through the gland, expansion blocks are arranged at both ends of the wedge block, and sealing disks are arranged on both sides of the expansion block. The present invention has the advantages of adding a pneumatic pilot valve, reducing the pressure in the main valve body cavity, reducing the valve opening and closing torque, and extending the life of the valve. The present invention has the function of adding a positioner to accurately adjust the valve switch stroke. The present invention relates to a control system, which has the advantage of making valve operation control more intelligent.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and in particular to a control gate valve and a control system thereof. Background Art

[0002] A gate valve generally includes a valve body, a gate plate, an inlet pipe and an outlet pipe. The valve body has a medium channel. The gate plate is movably arranged in the valve body to block or release the medium in the medium channel. The inlet pipe is connected to the medium channel and is used to connect to the water supply joint to access the fluid. The outlet pipe is connected to the medium channel and is used to discharge the fluid.

[0003] However, the current gate valve is not equipped with a pneumatic pilot valve, does not have a stroke adjustment and positioning function, and cannot reduce the pressure in the main valve body cavity and the torque when the main valve is opened, so it needs to be improved. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides a control gate valve that incorporates a pilot valve, reduces pressure in the main valve body cavity, reduces valve opening and closing torque, and extends valve life. The control gate valve also incorporates a positioner, enabling precise adjustment of the valve's opening and closing stroke.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a control gate valve, comprising a valve body, a valve seat being provided in the valve body, a valve stem being provided in the valve body, a pneumatic pilot valve being provided between the valve body and an external flow channel, a pressure cover being sleeved under the valve stem, the valve stem being connected to a wedge block through the pressure cover, expansion blocks being provided at both ends of the wedge block, and sealing disks being provided on both sides of the expansion block.

[0006] Preferably, a valve cover is sleeved on the side of the valve stem, a self-sealing ring is provided on the side of the valve cover, a pressure ring is provided on the side of the self-sealing ring, a four-open ring is provided on the side of the pressure ring away from the self-sealing ring, and a filler is provided between the valve stem and the valve cover.

[0007] Preferably, a traction plate is provided above the valve cover, and pre-tightening bolts are passed through the traction plate. A packing pressure plate is provided on the top of the valve cover, and pressure plate bolts are passed through the packing pressure plate.

[0008] Preferably, a transition connection block is provided in the middle of the valve stem, a bracket is provided in the valve body, and a positioner is provided on the bracket.

[0009] Preferably, a pneumatic actuator is provided above the valve stem, and the pneumatic actuator includes a hydraulic cylinder.

[0010] Preferably, a pneumatic actuator is provided above the valve stem, and the pneumatic actuator includes a hydraulic cylinder.

[0011] Preferably, a pointer is rotatably connected to the positioner, and a travel scale is provided in the valve body.

[0012] Another object of the present invention is to provide a control system for controlling a gate valve, wherein an air storage tank assembly is provided on one side of the pneumatic pilot valve, a filter pressure reducing valve is provided on one side of the air storage tank assembly, a delay valve is provided on one side of the filter pressure reducing valve, an air lock valve is provided on one side of the delay valve, a two-position three-way solenoid valve is provided on one side of the two-position three-way solenoid valve, a two-position five-way air control valve is provided on one side of the two-position five-way air control valve, a positioner is provided on one side of the positioner, an amplifier is provided on one side of the amplifier, a two-position three-way air control valve is provided on one side of the two-position three-way air control valve, and a cylinder is provided on one side of the two-position three-way air control valve.

[0013] Preferably, a two-position three-way solenoid valve is provided on one side of the filter pressure reducing valve, a quick exhaust valve is provided on one side of the two-position three-way solenoid valve, the pneumatic pilot valve is provided on one side of the quick exhaust valve, and a pneumatic gate valve is provided on one side of the pneumatic pilot valve.

[0014] Preferably, the pneumatic gate valve is connected to the cylinder, and a balancing valve is also provided on one side of the pneumatic gate valve, a feedback device is provided on one side of the feedback device, a hydraulic cylinder is provided on one side of the hydraulic cylinder, a balancing valve is provided on one side of the balancing valve, a two-position four-way manual valve is provided on one side of the two-position four-way manual valve, a manual hydraulic pump is provided on one side of the manual hydraulic pump, and a hydraulic oil tank assembly is provided on one side of the manual hydraulic pump.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. The main valve body is equipped with a pneumatic pilot valve. The pilot valve is opened before the main valve is opened. The main valve is opened only after the pressure in the main valve body cavity drops. This reduces the main valve opening torque, reduces the wear on the sealing surface, extends the service life of the valve, reduces the model of the pneumatic actuator, and reduces the valve installation space. Both the main valve and the pilot valve are pneumatically driven, which enables convenient and fast on-site and remote control, reduces manual labor intensity, and realizes system automation. The bracket is equipped with a positioner. By adjusting the inlet and outlet air sources with the positioner, the valve opening and closing stroke can be adjusted according to the actual working conditions on site. The bracket is equipped with an opening scale and an indicator arrow, which can synchronously and intuitively display the real-time opening and closing position of the valve. The flange part of the valve body adopts a high-pressure self-sealing structure. The higher the pressure, the more reliable the sealing performance. Compared with traditional bolted connections, the flange has a smaller outer diameter and fewer bolts, making the testing process simpler and more convenient. The valve stem and wedge block are connected with a threaded stem gland. A flat square is set at the bottom of the valve stem to ensure the connection strength and provide anti-rotation function, making the connection more secure and reliable. The contact surface between the wedge block and the expansion block adopts a wedge angle design. When the valve is open, the sealing disc and the valve seat sealing surface are disengaged in advance; when the valve is closed, the sealing surfaces are first pressed together and then sealed. This reduces sealing surface wear and extends valve service life. The outer edge of the sealing disc adopts a square design, which increases the contact area between the valve seat and the sealing disc sealing surface when the valve is open, reduces the sealing pressure, and extends the service life. The increased upward movement guide distance of the sealing disc makes the valve opening and closing adjustment more precise. The main valve pneumatic actuator adopts a dual-cylinder double-acting structure. Compared with the same model single-cylinder double-acting actuator, the actuator output torque is greater, and the overall valve appearance is more coordinated and beautiful. In addition to pneumatic drive, the main valve is also equipped with a manual hydraulic drive device. When the on-site gas source fails or during installation and debugging, manual operation is easier and more stable. The valve body and actuator adopt a split design structure, and the connection dimensions comply with international standards, which is more conducive to the later maintenance and upkeep of the valve.

[0017] 2. An air storage tank is provided at the main air source. When the on-site air source fails, the air source in the air storage tank can ensure the normal opening and closing of the pneumatic valve for two strokes, and finally put the pneumatic valve in a closed state, which minimizes the failure loss. A delay valve is provided between the filter pressure reducing valve and the locking valve to ensure that the pneumatic pilot valve opens before the main valve, reduces the valve opening torque, reduces the wear of the valve sealing surface, and extends the service life of the valve. An air lock valve is provided before the solenoid valve to prevent too low an air source from entering the control system, causing unstable opening and closing of the valve. A positioner is provided behind the air control valve. The positioner can adjust the inlet and outlet air sources according to the To meet the actual working conditions on site, the valve opening and closing stroke can be adjusted. An amplifier is set behind the positioner to increase the inlet and outlet flow of the gas source in the control pipeline, thereby speeding up the cylinder operation speed and reducing the valve opening and closing time. Feedback devices are set at the upper and lower ends of the cylinder to enable the remote control room to obtain accurate and real-time valve opening and closing information, thereby better realizing system automation. A quick exhaust valve is set between the solenoid valve and the pilot valve to increase the gas source discharge speed in the control system and reduce the opening and closing time of the pilot valve. In addition to pneumatic control, the entire control system also adds on-site manual hydraulic control to make manual operation more convenient and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment;

[0019] Figure 2 Schematic diagram of the structure of the main valve body and the pneumatic pilot valve in the embodiment;

[0020] Figure 3 Schematic diagram of the cross-sectional structure of the main valve body and the pneumatic pilot valve in the embodiment;

[0021] Figure 4 It is a structural diagram of the pneumatic pilot valve;

[0022] Figure 5 The figure is a schematic diagram of the connection relationship structure of a control system for controlling a gate valve.

[0023] Figure numerals: 1. Valve body; 2. Push rod; 3. Valve seat; 4. Expansion block; 5. Sealing disk; 6. Wedge block; 7. Pressure cover; 8. Valve stem; 9. Valve cover; 10. Self-sealing ring; 11. Pressure ring; 12. Four-open ring; 13. Packing; 14. Pull plate; 15. Pre-tightening bolt; 16. Packing pressure plate; 17. Pressure plate bolt; 18. Transition connection block; 19. Bracket; 20. Positioner; 21. Pneumatic actuator; 22. Hydraulic cylinder; 23. Travel scale; 24. Pointer; 25. Pneumatic pilot valve. DETAILED DESCRIPTION

[0024] The present invention will be further described with reference to the accompanying drawings.

[0025] A control gate valve, such as Figure 1-Figure 5As shown, it includes a valve body 1, a valve seat 3 is provided in the valve body 1, a valve stem 8 is provided in the valve body 1, a pneumatic pilot valve 25 is provided between the valve body 1 and the external flow channel, a gland 7 is sleeved below the valve stem 8, and the valve stem 8 is connected to a wedge block 6 through the gland 7. The wedge block 6 is provided with expansion blocks 4 at both ends, and sealing disks 5 are provided on both sides of the expansion block 4. A push rod 2 is provided above the valve seat 3.

[0026] The side of the valve stem 8 is sleeved with a valve cover 9, the side of the valve cover 9 is provided with a self-sealing ring 10, the side of the self-sealing ring 10 is provided with a pressure ring 11, and the side of the pressure ring 11 away from the self-sealing ring 10 is provided with a four-open ring 12, and a filler 13 is provided between the valve stem 8 and the valve cover 9.

[0027] A traction plate 14 is provided above the valve cover 9 , and a pre-tightening bolt 15 is passed through the traction plate 14 . A packing pressure plate 16 is provided on the top of the valve cover 9 , and a pressure plate bolt 17 is passed through the packing pressure plate 16 .

[0028] A transition connection block 18 is provided in the middle of the valve stem 8 , a bracket 19 is provided in the valve body 1 , and a positioner 20 is provided on the bracket 19 .

[0029] A pneumatic actuator 21 is provided above the valve stem 8 , and the pneumatic actuator 21 includes a hydraulic cylinder 22 .

[0030] A pointer 24 is rotatably connected to the positioner 20 , and a travel scale 23 is provided in the valve body 1 .

[0031] A control system for controlling a gate valve, wherein an air storage tank assembly is provided on one side of the pneumatic pilot valve 25, a filter pressure reducing valve is provided on one side of the air storage tank assembly, a delay valve is provided on one side of the filter pressure reducing valve, an air lock valve is provided on one side of the delay valve, a two-position three-way solenoid valve is provided on one side of the two-position three-way solenoid valve, a two-position five-way air control valve is provided on one side of the two-position five-way air control valve, a positioner 20 is provided on one side of the positioner 20, an amplifier is provided on one side of the amplifier, a two-position three-way air control valve is provided on one side of the two-position three-way air control valve, and a cylinder is provided on one side of the two-position three-way air control valve.

[0032] A two-position three-way solenoid valve is provided on one side of the filter pressure reducing valve, a quick exhaust valve is provided on one side of the two-position three-way solenoid valve, the pneumatic pilot valve 25 is provided on one side of the quick exhaust valve, and a pneumatic gate valve is provided on one side of the pneumatic pilot valve 25.

[0033] The pneumatic gate valve is connected to the cylinder, and a balancing valve is also provided on one side of the pneumatic gate valve, a feedback device is provided on one side of the feedback device, a hydraulic cylinder 22 is provided on one side of the hydraulic cylinder 22, a balancing valve is provided on one side of the balancing valve, a two-position four-way hand-rotating valve is provided on one side of the balancing valve, a manual hydraulic pump is provided on one side of the two-position four-way hand-rotating valve, and a hydraulic oil tank assembly is provided on one side of the manual hydraulic pump.

[0034] Working principle:

[0035] A pneumatic pilot valve 25 is provided between the central passage and the flow channel of the main valve body 1. Before the main valve needs to be opened, the pilot valve is opened first, and the main valve is opened after the pressure in the central cavity of the valve body 1 is reduced. The air source enters the cylinder from the air inlet A1 and the air inlet A2 through the positioner 20. The air source drives the piston to move upward, and the piston drives the piston rod, which drives the valve stem 8 to move upward, and the piston rod drives the wedge block 6 to move upward. Due to the wedge angle of the wedge block 6, the expansion block 4 and the sealing disk 5 shrink inward while the wedge block 6 moves upward, and the sealing disk 5 separates from the sealing surface of the valve seat 3. The sealing disk 5 continues to move upward with the wedge block 6 until the valve is fully opened. When the air source passes through the positioner 20 from the air inlet B1 and The air inlet B2 enters the cylinder, and the air source drives the piston to move downward. The piston drives the piston rod, and the piston rod drives the valve stem 8 to move downward. The piston rod drives the wedge block 6 to move downward, and the push rod 2 drops to the positioning platform of the valve body 1. The sealing disk 5 drops to a position where its center line coincides with the center line of the flow channel of the valve body 1. The wedge block 6 continues to move downward. Due to the wedge angle of the wedge block 6, the expansion block 4 and the sealing disk 5 move toward the sealing surface of the valve seat 3 and fit together until the valve is completely sealed, the pilot valve is closed, and the entire valve is closed.

[0036] A positioner 20 is provided on the bracket 19. The gas source passes through the positioner 20 before entering the cylinder. The gas source is adjusted by the positioner 20 so that the valve opening and closing stroke can be accurately adjusted.

[0037] The valve is equipped with not only an air cylinder for pneumatic control, but also a hydraulic cylinder 22 for hydraulic control. When the on-site air source fails or the valve is in the process of installation, maintenance and commissioning, the hydraulic control system makes on-site manual operation of the valve easier and more stable.

[0038] When the air source enters the filter pressure reducing valve from the air storage tank, a delay valve is installed between the filter pressure reducing valve and the lock valve. The air source first passes through the solenoid valve, opening the pneumatic pilot valve from the B inlet. After the pressure in the pneumatic gate valve cavity drops, the air source passes through the air lock valve, the solenoid valve is energized, the air control valve PA is opened, and the air source enters the cylinder through the positioner and the A1 inlet, opening the pneumatic gate valve. The positioner is a dual-electric control type with an air source direction switching function. When the positioner is energized, the air source passes through the positioner and the air control valve PA, entering the cylinder from the A2 inlet, closing the pneumatic gate valve. The air source passes through the solenoid valve, closing the pneumatic pilot valve from the A inlet.

[0039] When the on-site gas source fails or the gas source pressure is lower than the locking valve setting value, the gas source passes through the air control valve PB, the air control valve RA is unblocked, and enters the cylinder from the A2 air inlet, and the pneumatic gate valve is closed.

[0040] When there is no air source on site or for installation and commissioning, manual valve operation is required: first open the balancing valve, close the balancing valve, adjust the hand valve to PA, manually press the hydraulic pump's built-in handle, and hydraulic oil flows from the oil tank through the B1 oil inlet to the hydraulic cylinder, opening the pneumatic gate valve. When the hand valve is adjusted to PB, manually press the hydraulic pump's built-in handle, and hydraulic oil flows from the oil tank through the B2 oil inlet to the hydraulic cylinder, closing the pneumatic gate valve.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control gate valve, comprising a valve body (1), a valve seat (3) being arranged in the valve body (1), and a valve stem (8) being arranged in the valve body (1), characterized in that: A pneumatic pilot valve (25) is arranged between the valve body (1) and the external flow channel, a gland (7) is sleeved below the valve stem (8), the valve stem (8) is connected to a wedge block (6) through the gland (7), expansion blocks (4) are arranged at both ends of the wedge block (6), sealing disks (5) are arranged on both sides of the expansion block (4), an air storage tank assembly is arranged on one side of the air storage tank assembly, a filter pressure reducing valve is arranged on one side of the filter pressure reducing valve, a time delay valve is arranged on one side of the time delay valve, an air lock valve is arranged on one side of the air lock valve, a two-position three-way solenoid valve is arranged on one side of the two-position three-way solenoid valve, a two-position five-way air control valve is arranged on one side of the two-position five-way air control valve, a positioner (20) is arranged on one side of the positioner (20), an amplifier is arranged on one side of the amplifier, a two-position three-way air control valve is arranged on one side of the two-position three-way air control valve, and a cylinder is arranged on one side of the two-position three-way air control valve.

2. The control gate valve according to claim 1, characterized in that: The side of the valve stem (8) is sleeved with a valve cover (9), the side of the valve cover (9) is provided with a self-sealing ring (10), the side of the self-sealing ring (10) is provided with a pressure ring (11), the side of the pressure ring (11) away from the self-sealing ring (10) is provided with a four-open ring (12), and a filler (13) is provided between the valve stem (8) and the valve cover (9).

3. The control gate valve according to claim 1, characterized in that: A traction plate (14) is arranged above the valve cover (9), and a pre-tightening bolt (15) is passed through the traction plate (14). A packing pressure plate (16) is arranged on the top of the valve cover (9), and a pressure plate bolt (17) is passed through the packing pressure plate (16).

4. The control gate valve according to claim 1, characterized in that: A transition connection block (18) is arranged in the middle of the valve stem (8), a bracket (19) is arranged in the valve body (1), and a positioner (20) is arranged on the bracket (19).

5. The control gate valve according to claim 1, characterized in that: A pneumatic actuator (21) is arranged above the valve stem (8), and the pneumatic actuator (21) comprises a hydraulic cylinder (22).

6. The control gate valve according to claim 1, characterized in that: A pointer (24) is rotatably connected to the positioner (20), and a travel scale (23) is arranged inside the valve body (1).

7. The control system for controlling a gate valve according to claim 1, characterized in that: A two-position three-way solenoid valve is arranged on one side of the filter pressure reducing valve, a quick exhaust valve is arranged on one side of the two-position three-way solenoid valve, the pneumatic pilot valve (25) is arranged on one side of the quick exhaust valve, and a pneumatic gate valve is arranged on one side of the pneumatic pilot valve (25).

8. The control system for controlling a gate valve according to claim 7, characterized in that: The pneumatic gate valve is connected to the cylinder, a balancing valve is also arranged on one side of the pneumatic gate valve, a feedback device is arranged on one side of the balancing valve, a hydraulic cylinder (22) is arranged on one side of the feedback device, a balancing valve is arranged on one side of the hydraulic cylinder (22), a two-position four-way hand-turned valve is arranged on one side of the balancing valve, a manual hydraulic pump is arranged on one side of the two-position four-way hand-turned valve, and a hydraulic oil tank assembly is arranged on one side of the manual hydraulic pump.

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