Tubular stop valve

Abstract

A main valve body and an auxiliary valve body are fixedly connected through a bolt, a positioning support and a guide support are installed at the inlet end and the outlet end of the main valve body respectively, a valve plate and a valve rod are fixedly connected and installed between the positioning support and the guide support, a spring is arranged between the valve plate and the guide support, and a valve seat is fixedly installed in the main valve body. The crankshaft is installed in the auxiliary valve body and supported on the auxiliary valve body through a shaft sleeve, the outer end of the crankshaft is fixedly connected with the operating rod, and the crankshaft is connected with the valve rod through a connecting rod. The operating rod is operated to drive the crankshaft to rotate, then the connecting rod is driven to act, and the valve rod and the valve plate are pulled to linearly move to be separated from the valve seat to complete valve opening action. When the control force is removed, the valve plate and the valve rod automatically reset under the action of the spring force to complete the valve closing action, the valve plate and the valve bottom are in compression sealing and have no relative sliding friction, so that the sealing effect is good, the service life is long, the main valve body adopts a straight-through type annular wide body cavity structure, and the flow resistance coefficient is small.

Description

Technical Field

[0001] The invention relates to a valve, in particular to a valve for controlling the cut-off and connection of a fluid medium and stably regulating the flow rate. Background Art

[0002] In the existing pipe network system, the valves used to control fluid media include butterfly valves, gate valves, ball valves, stop valves and other traditional valves, each of which has its own advantages and disadvantages. For example, the ball valve has the advantages of good sealing performance and small flow resistance coefficient, but during the opening and closing operation, its sealing pair slides under pressure under the action of the spring preload, and its friction torque is large, the sealing pair is easy to wear, and the production cost of the ball valve is very high. The gate valve has the advantages of small flow resistance coefficient and good sealing performance, but its valve body is tall and occupies a large space, especially the valve plate and the valve shaft are hook-type connection, the valve plate is easy to fall, which often affects the use effect, and because the valve plate and the valve body sealing surface are wedge-shaped with the sealing pair, during the opening and closing operation, there will be scraping and rubbing between the sealing surfaces, affecting the service life of the sealing pair. The butterfly valve has the advantages of small size, light weight, and low cost, but the butterfly plate is in the center of the flow channel after opening, and its sealing surface is easily eroded and damaged, and the service life is short. The stop valve has the advantages of good sealing performance and easy operation, but its valve body is a "T" structure, the flow resistance coefficient is too large, and the energy consumption is too high. Summary of the invention

[0003] The purpose of this patent is to provide a through-flow stop valve that can meet the requirements of cutting off and connecting the fluid medium in the control pipe network and stably regulating the flow rate. It has the advantage of good sealing performance of ordinary stop valves and solves the technical problems of traditional valves such as butterfly valves, ball valves, gate valves, stop valves, etc., such as large friction torque during operation and closing, easy wear of sealing pairs, easy detachment of valve plates, high flow resistance coefficient, high energy consumption, and short service life.

[0004] The technical solution of the patent of the present invention: the through-flow stop valve is composed of a valve body, a valve plate, a spring, a guide bracket, a positioning bracket, a sleeve, an operating rod, a crankshaft, a connecting rod, a hinge, a valve seat, a valve stem and bolts; the valve body is composed of a main valve body and an auxiliary valve body connected by bolts; the valve stem is fixedly connected to the valve plate; the valve seat is fixed in the main valve body, and the guide bracket and the positioning bracket are arranged at the inlet and outlet ends of the main valve body; the valve stem and the valve plate are installed in the main valve body between the guide bracket and the positioning bracket, and a spring is arranged between the guide bracket and the valve plate; the crankshaft is installed in the auxiliary valve body, and is supported and sealed with a sleeve and an "O"-shaped sealing ring between it and the auxiliary valve body, and its shaft end is fixedly connected to the operating rod; the "O"-shaped sealing ring is embedded in the sleeve, and the sleeve is fixedly installed on the valve body with screws; the valve stem and the crankshaft are connected with a connecting rod, one end of the connecting rod is connected to the crankshaft with a connecting rod seat, and the other end of the connecting rod is connected to the valve stem with a hinge.

[0005] This flow-through stop valve is in a closed state when there is no external force to operate the joystick. When it is necessary to open the flow-through stop valve, only an external mechanical power or manual operation of the joystick is required. At this time, the joystick drives the crankshaft to rotate, and the crankshaft drives the connecting rod seat and one end of the connecting rod to move according to the rotation trajectory of the crankshaft. At the same time, the other end of the connecting rod pulls the valve stem and the valve plate through the hinge to make a linear motion to separate from the valve seat to complete the valve opening action; at this time, only the external mechanical power or manual operation of the joystick is required to keep the joystick in the valve opening position, so that the valve is in an open state, which can ensure that the valve stably supplies the medium fluid to the downstream users. When it is necessary to close the flow-through stop valve, only the external mechanical power or manual operation force is required. At this time, the valve plate and the valve stem automatically reset and press the valve seat under the action of the spring to complete the valve closing action; at the same time, the valve stem pulls one end of the connecting rod, and drives the crankshaft and the joystick to return synchronously through the connecting rod seat at the other end of the connecting rod. When the flow-through stop valve is opened, the connecting rod pulls the valve stem to drive the valve plate to instantly leave the valve seat, and when the valve is closed, the spring force pushes the valve plate toward the valve seat, and the valve plate and the valve seat are compressed and sealed by the spring force and the medium pressure. There is no relative sliding friction between the valve plate and the valve seat, so the seal is reliable and has a long service life. In addition, because the main valve body of the flow-through stop valve adopts a straight-through annular wide body cavity structure, the medium fluid does not reduce the diameter when flowing through the valve body, nor does it bypass the flow, so the flow resistance coefficient of the valve is small and does not produce cavitation. Therefore, the flow-through stop valve completely solves the technical problems of the traditional pipe network system valve seal pair being easy to damage, having a short service life, having a high flow resistance coefficient, and having high energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structural principle of the patent of this invention.

[0007] 1. Main valve body 2. Valve stem 3. Valve seat 4. Valve plate 5. Spring 6. Bolt 7. Hinge 8. Connecting rod 9. Crankshaft 10. Auxiliary valve body 11. Connecting seat 12. Bolt 13. Bushing 14. Control lever 15. "O" ring 16. Screw 17. Guide bracket 18. Bushing 19. Positioning bracket DETAILED DESCRIPTION

[0008] Figure 11 is an embodiment of a through-flow stop valve, in which a main valve body 1 and an auxiliary valve body 10 of the through-flow stop valve are connected by bolts 6; a valve stem 2 is fixedly connected to a valve plate 4, a valve seat 3 is fixedly connected in the main valve body 1, a guide bracket 17 is mounted at the outlet end of the main valve body 1, a positioning bracket 19 is mounted at the inlet end of the main valve body 1, a valve stem 2 and a valve plate 4 are mounted in the main valve body 1 between the guide bracket 17 and the positioning bracket 19, a spring 5 is arranged between the guide bracket 17 and the valve plate 4; a crankshaft 9 is mounted in the auxiliary valve body 10, a shaft sleeve 13 is supported between the crankshaft 9 and the auxiliary valve body 10, the shaft sleeve 13 is fixedly mounted on the auxiliary valve body 10 by screws, an "O"-shaped sealing ring is installed between the crankshaft 9 and the shaft sleeve 13, an outer end of the crankshaft 9 is fixedly connected to a lever 14, a connecting rod 8 is connected between the valve stem 2 and the crankshaft 9, one end of the connecting rod 8 is connected to the crankshaft 9 by a connecting rod seat 11 and a bolt 12, and the other end of the connecting rod 8 is connected to the valve stem 2 by a hinge 7.

[0009] In the case of no external force to operate the joystick 14, the valve plate 4 presses the valve seat 3 under the pressure of the spring 5, so that the valve is in a closed state. When the flow-through stop valve needs to be opened, only external mechanical power or manual operation of the joystick 14 is needed. At this time, the joystick 14 drives the crankshaft 9 to rotate, and the crankshaft 9 drives the connecting rod seat 11 and one end of the connecting rod 8 to move synchronously according to the rotation trajectory of the crankshaft 9. At the same time, the other end of the connecting rod 8 pulls the valve stem 2 and the valve plate 4 to make a linear motion to separate from the valve seat 3 through the hinge 7, so that the valve opening action is completed; at this time, only the external mechanical power or manual operation of the joystick 14 is needed to be maintained, so that the joystick 14 is in the valve opening position, then the valve is in an open state, which can ensure that the valve stably supplies the medium fluid to the downstream users. When the flow-through stop valve needs to be closed, only the external mechanical power or manual operation force needs to be removed. At this time, the valve plate 4 and the valve stem 2 automatically reset and press the valve seat 3 under the elastic force of the spring 5, so that the valve closing action is completed. When the flow of the medium needs to be adjusted, the opening degree of the valve plate 4 and the valve stem 2 can be adjusted by simply manipulating the position of the joystick 14, thereby achieving the purpose of adjusting the flow of the medium.

Claims

1. A through-flow stop valve, which is composed of a main valve body, a sub-valve body, a valve seat, a positioning bracket, a guide bracket, a valve plate, a valve stem, a spring, a crankshaft, a connecting rod, a joystick and a sleeve, and is characterized in that: The crankshaft is rotated by operating the joystick, and the crankshaft drives the connecting rod to pull the valve plate and valve stem to make a linear motion away from the valve seat to complete the valve opening action, while the valve closing action is completed by the spring force to reset the valve plate and valve stem and press the valve seat.

2. The through-flow stop valve according to claim 1, characterized in that: The main valve body and the auxiliary valve body are fixedly connected with bolts.

3. The through-flow stop valve according to claim 1, characterized in that: The positioning bracket and the guide bracket are respectively installed at the inlet and outlet ends of the main valve body.

4. The through-flow stop valve according to claim 1, characterized in that: The valve plate and the valve stem are fixedly connected and installed between the positioning bracket and the guide bracket.

5. The through-flow stop valve according to claim 1, characterized in that: The spring is installed between the valve plate and the guide bracket.

6. The through-flow stop valve according to claim 1, characterized in that: The crankshaft is mounted on the auxiliary valve body.

7. The through-flow stop valve according to claim 1, characterized in that: A shaft sleeve is supported between the crankshaft and the auxiliary valve body, and the shaft sleeve is fixedly installed on the auxiliary valve body by screws.

8. The through-flow stop valve according to claim 1, characterized in that: The outer end of the crankshaft is fixedly connected to the operating lever.

9. The through-flow stop valve according to claim 1, characterized in that: The crankshaft and the valve stem are connected by a connecting rod.

10. The through-flow stop valve according to claim 1, characterized in that: The connecting rod and the valve stem are connected by a hinge.

11. The through-flow stop valve according to claim 1, characterized in that: The crankshaft and connecting rod are connected by connecting rod seat and bolts.

12. The through-flow stop valve according to claim 1, characterized in that: An "O" ring is installed between the crankshaft and the sleeve.

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