CN204573137U - A kind of pneumatic expansion formula butterfly valve - Google Patents

Abstract

A pneumatic expansion butterfly valve, including a valve body, a valve plate, a valve stem and an actuator arranged above the butterfly body, a valve plate is arranged in the fluid passage of the valve body to block the fluid passage, and the valve plate is driven by the valve stem and the actuator The fluid channel is also provided with an elastic valve seat that is in close contact with or separated from the valve plate when the valve plate blocks the fluid channel. A cavity is provided between the elastic valve seat and the valve body, and the cavity is connected by a pipeline. The outlet end of the modular process control valve arranged outside the valve body, the inlet end of the modular process control valve is connected to the control valve through the pipeline, the actuator is also connected to the control valve through the pipeline, and the control valve is connected to the external pressure The air source is connected. The utility model is novel in design and unique in structure. The starting torque of the butterfly valve is ultra-small, and the action is very sensitive. The service life and economy have been greatly improved.

Description

A pneumatic expansion butterfly valve

technical field

The utility model relates to a pipeline flow control device in the pipeline laying field, in particular to a pneumatic expansion butterfly valve.

Background technique

The butterfly valve is installed in the fluid channel of the cylindrical valve body with a disc-shaped butterfly valve plate, which rotates 0-90° around the axis of the valve stem. When the butterfly plate is at 0°, the valve is completely closed; when it is rotated to At 90 degrees, the valve is fully opened; due to the advantages of simple structure, small size, light weight, flexible operation, convenient installation, and large flow capacity, butterfly valves are increasingly used in pipeline installations. However, when the traditional butterfly valve is opened and closed, the strong frictional torque between the valve plate and the valve seat is too large, which reduces the service life of the valve. Moreover, the traditional butterfly valve has a large torque when it is started and closed, requiring the actuator to provide greater power.

Utility model content

Aiming at the defects of low service life and high torque of traditional butterfly valves, the utility model provides a pneumatic expansion butterfly valve.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a pneumatic expansion butterfly valve, including a valve body, a valve plate, a valve stem and an actuator arranged above the butterfly body, and a barrier is arranged in the fluid channel of the valve body. The valve plate of the fluid channel, the valve plate is connected with the actuator through the valve stem, and the elastic valve seat is also arranged in the fluid channel, which is in close contact with or separated from the valve plate when the valve plate blocks the fluid channel, and the elastic valve seat is in contact with the valve There is a cavity between the bodies, and the cavity is connected to the outlet end of the modular process control valve outside the valve through a pipeline, and the inlet end of the modular process control valve is connected to the control valve through a pipeline. The device is also connected to the control valve through the pipeline, and the control valve is connected to the external pressure gas source.

The utility model further provides a pneumatic expansion butterfly valve, the elastic valve seat is tightly connected to the seat fixing base provided in the fluid channel, and a closed cavity is formed between the valve seat fixing base and the elastic valve seat, A connecting hole communicating with the closed cavity is arranged on the valve body.

The utility model further provides a pneumatic expansion butterfly valve, the actuator of which is a pneumatic actuator, which includes a cylinder, and two driving pistons are arranged in the cylinder, and driving racks are arranged on the two driving pistons, and the transmission of the actuator and the actuator The upper end of the connected valve stem is provided with a gear meshed with the two driving racks, and the two driving pistons divide the cylinder into three independent airtight chambers, wherein the airtight chamber formed between the two driving pistons is set by setting the first on the cylinder wall. The interface communicates with the outside, and the other two cavities communicate with the outside through the second interface arranged on the cylinder wall.

The utility model further provides a pneumatic expansion butterfly valve, whose modular process control valve includes a flow regulating valve, a pressure regulating valve, a pressure gauge, and a one-way quick exhaust valve, and the inlet of the flow regulating valve is a modular process control valve. At the inlet end of the valve, the flow regulating valve, the pressure regulating valve and the one-way quick exhaust valve are connected in series in sequence. The one-way quick exhaust valve includes the inlet, the outlet and the quick exhaust port, and the outlet is a modular process control The outlet end of the valve, the quick exhaust port communicates with the atmosphere.

The utility model further provides a pneumatic expansion butterfly valve, the control valve of which is a two-position five-way solenoid valve.

The utility model further provides a pneumatic expansion butterfly valve, whose elastic valve seat is made of nitrile rubber, polyurethane or fluororubber.

Beneficial effects of the utility model: the utility model makes full use of the advantages of the expansion valve seat and the valve plate. Contact wear avoids the disadvantages of traditional butterfly valves, and actuators with lower torque can be selected, and the service life and economy of butterfly valves have been greatly improved.

Description of drawings

Fig. 1, the overall structure schematic diagram of the utility model;

Fig. 2, the exploded schematic diagram of connection structure of the present utility model;

Fig. 3, the structural representation of modular process control valve in the utility model;

Fig. 4, the structural representation of two-position five-way solenoid valve in the utility model;

Fig. 5, the schematic diagram of the valve structure when the utility model is closed;

Fig. 6 is a schematic diagram of the valve structure when the utility model is opened.

Detailed ways

In order to improve the defects of low service life and large torque of the traditional butterfly valve, a pneumatic expansion butterfly valve (as shown in Figure 1 to Figure 6) is designed. A pneumatic expansion butterfly valve includes a valve body 1, a valve plate 2, a valve stem 3 and The actuator 4 is arranged above the butterfly body 1. The valve plate 2 is arranged in the fluid passage of the valve body 1 to block the fluid passage. When the plate 2 blocks the fluid channel, the elastic valve seat 5 is in close contact with or separated from the valve plate 2. There is a cavity between the elastic valve seat 5 and the valve body 1, and the cavity is connected to the outside of the valve body 1 through a pipeline. The outlet end of the set modular process control valve 6 and the access end of the modular process control valve 6 are connected to the control valve 7 through a pipeline, and the actuator 4 is also connected to the control valve 7 through a pipeline, and the control valve 7 is connected to the control valve 7 again. Connect to external pressure air source.

The elastic valve seat 5 is tightly connected to the valve seat fixing base 8 provided in the fluid channel, and a closed cavity is formed between the valve seat fixing base 8 and the elastic valve seat 5 . The connecting hole 9 through which the airtight cavity communicates.

The actuator 4 is a pneumatic actuator, which includes a cylinder 10. Two driving pistons 11 are arranged in the cylinder 10, and a driving rack 12 is arranged on the two driving pistons 11. The valve rod 3 connected to the actuator 4 is The upper end is provided with a gear 13 meshed with two driving racks 12, and the two driving pistons 11 divide the cylinder 10 into three independent airtight chambers. The interface 14 communicates with the outside, and the other two cavities communicate with the outside through the second interface 15 arranged on the cylinder wall.

The modular process control valve 6 includes a flow regulating valve 16, a pressure regulating valve 17, a pressure gauge 18, and a one-way quick exhaust valve 19. The inlet of the flow regulating valve 16 is the access port of the modular process control valve 6 , the flow regulating valve 16, the pressure regulating valve 17, and the one-way quick exhaust valve 19 are sequentially connected in series, and the one-way quick exhaust valve 19 includes an inlet, an outlet, and a quick exhaust port, wherein the outlet is a modular process control valve The connecting end of the outlet, the quick exhaust port communicates with the atmosphere.

The control valve 7 is a two-position five-way solenoid valve, and a two-position five-way ordinary NAMUR double solenoid valve is used in the specific implementation. The elastic valve seat 5 is made of nitrile rubber, polyurethane or fluorine rubber.

The external pressure gas source is generally an air compressor or a compressed gas storage tank.

The working principle of the utility model: under the control of the two-position five-way solenoid valve, the pneumatic actuator pushes the rotation of the valve plate 2 to realize the opening and closing of the valve. When the valve plate 2 moves to the position where the valve is closed, the valve plate 2 only touches the elastic valve seat 5 momentarily, which can reduce friction, wear and stem driving torque; after the valve is closed, the modular process control valve 6 Under the control of the valve, the elastic valve seat 5 expands toward the valve plate 2, thereby providing a larger sealing surface and providing uniform pressure on the valve plate 2; before opening the valve, the control of the modular process control valve 6 and the pneumatic actuator Under the action, the elastic valve seat is first tightened, and then the valve plate 2 rotates freely to the open position.

The beneficial effects of the utility model: the advantages of the expansion valve seat and the valve plate are brought into full play by adopting the modular combination valve, the design is novel, the structure is unique, the starting torque of the butterfly valve is ultra-small, the action is very sensitive, and the wear is low, avoiding In spite of the disadvantages of traditional butterfly valves, actuators with smaller torque can be selected, and the service life and economy of butterfly valves have been greatly improved.

Simple replacement and replacement by those skilled in the art are all within the protection scope of this patent.

Claims (6)

1. A pneumatic expansion butterfly valve, comprising a valve body, a valve plate, a valve stem and an actuator arranged above the butterfly body, a valve plate blocking the fluid passage is arranged in the fluid passage of the valve body, and the valve plate passes through the valve stem and the actuator The transmission connection of the device is characterized in that the fluid channel is also provided with an elastic valve seat that is in close contact with or separated from the valve plate when the valve plate blocks the fluid channel, and a cavity is provided between the elastic valve seat and the valve body. The cavity is connected to the outlet end of the modular process control valve provided outside the valve body through a pipeline, and the inlet end of the modular process control valve is connected to the control valve through a pipeline, and the actuator is also connected to the control valve through a pipeline. The control valve is then connected with an external pressure air source. 2. A pneumatic expansion butterfly valve according to claim 1, characterized in that the elastic valve seat is tightly connected to the seat fixing base provided in the fluid passage, and the seat fixing base and the elastic valve seat An airtight cavity is formed, and a connection hole communicating with the airtight cavity is arranged on the valve body. 3. A kind of pneumatic expansion butterfly valve according to claim 1, characterized in that, the actuator is a pneumatic actuator, which includes a cylinder, and two drive pistons are arranged in the cylinder, and a drive rack is arranged on the two drive pistons, The upper end of the valve stem connected to the actuator is provided with a gear meshed with two driving racks, and the two driving pistons divide the cylinder into three independent airtight chambers, wherein the airtight chamber formed between the two driving pistons passes through The first interface on the cylinder wall communicates with the outside, and the other two cavities communicate with the outside through the second interface arranged on the cylinder wall. 4. A pneumatic expansion butterfly valve according to claim 1, 2 or 3, characterized in that the modular process control valve comprises a flow regulating valve, a pressure regulating valve, a pressure gauge, and a one-way quick exhaust valve, The inlet of the flow regulating valve is the access end of the modular process control valve. The flow regulating valve, pressure regulating valve and one-way quick exhaust valve are connected in series in sequence. The one-way quick exhaust valve includes an inlet, an outlet, and a quick exhaust The outlet is the outlet of the modular process control valve, and the quick exhaust port is connected to the atmosphere. 5. A pneumatic expansion butterfly valve according to claim 4, characterized in that the control valve is a two-position five-way solenoid valve. 6 . The pneumatic expansion butterfly valve according to claim 1 , wherein the elastic valve seat is made of nitrile rubber, polyurethane or fluororubber. 7 .