A precision control valve

Abstract

The utility model discloses a precision control valve, including valve body and pressure regulating valve seat, the bottom end of valve body is connected with pressure regulating valve seat, and the inside of valve body is divided into first oil outlet chamber, oil inlet chamber, second oil outlet chamber and pressure chamber from top to bottom, the middle part of valve body is equipped with the oil inlet hole of communicating with oil inlet chamber, and the first oil outlet chamber is equipped with the sealing valve stem with valve rod spring activity, the upper portion of valve body is equipped with the first oil outlet hole of communicating with first oil outlet chamber, and the second oil outlet chamber and pressure chamber are equipped with the piston with piston spring activity, the lower portion of valve body is equipped with the second oil outlet hole of communicating with second oil outlet chamber, and the pressure regulating chamber of communicating with pressure chamber is equipped in pressure regulating valve seat, and the both ends of pressure regulating chamber are equipped with first adjusting hole and second adjusting hole, and the pressure regulating assembly is arranged in first adjusting hole, and second adjusting hole is communicated to outside and is equipped with pressure relief assembly, and pressure regulating assembly and pressure relief assembly are connected through pressure regulating spring.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and specifically to a precision control valve. Background Technology

[0002] Valve components are widely used in industrial control systems, primarily for controlling parameters such as pressure, flow rate, and flow direction of the medium.

[0003] Control valves can be classified in several ways. They are valves with special functions, and while the valves themselves are not special, the differences lie in their function and application. Classifications include manual control valves, pneumatic / hydraulic control valves, and directional control valves: 1. Manual control valves are mechanically driven by a handle, handwheel, or pedal, suitable for simple working conditions (such as an exhaust brake butterfly valve where the valve plate is rotated by a push rod); 2. Pneumatic / hydraulic control valves include pneumatic diaphragm valves and piston valves. Pneumatic diaphragm valves use air pressure changes to deform the diaphragm and drive the valve stem (positive / reverse action design affects the direction of movement), while piston valves use control oil pressure to push the piston for bidirectional control (such as a hydraulically piloted check valve that can conduct in reverse); 3. Directional control valves include check valves and directional control valves. Check valves only allow unidirectional flow and have spring-assisted sealing (forward conduction, reverse cut-off), while directional control valves use multi-channel designs such as spool valves and rotary valves to change the oil circuit connection method (such as a three-position four-way valve).

[0004] The main characteristics of hydraulic piston-type control valves are their compact structure, reliable sealing, simple design, and the fact that the sealing surface and central pipe are usually in a closed state. They are also suitable for harsh working conditions with media such as water and hydraulic oil, and are widely used in various industries. Their working principle involves adjusting the position or structural changes of the valve core to control the pressure, flow rate, and direction of the hydraulic fluid in the system, thereby driving the actuator to achieve the desired action. Based on function, they can be divided into three categories: pressure control valves, flow control valves, and directional control valves, which achieve their corresponding functions through spring force balancing, throttle adjustment, and oil circuit switching, respectively. However, existing hydraulic piston-type control valves, when delivering hydraulic oil and other media to bidirectional equipment, exhibit a phenomenon of imbalance in the proportion of media being delivered during equipment use. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a precision control valve. This precision control valve has a reasonable structure and can play a key role in stabilizing the hydraulic oil pressure balance, allowing each device to achieve precise parameter control of bidirectional flow and pressure balance through the flow characteristic curve of the regulating valve.

[0006] The technical solution of this utility model is as follows:

[0007] A precision control valve includes a valve body and a pressure regulating valve seat. The bottom end of the valve body is connected to the pressure regulating valve seat. The valve body is divided from top to bottom into a first oil outlet chamber, an oil inlet chamber, a second oil outlet chamber, and a pressure chamber. An oil inlet hole communicating with the oil inlet chamber is provided in the middle of the valve body. A sealing valve stem is movably disposed in the first oil outlet chamber by a valve stem spring. The sealing valve stem blocks the inlet between the oil inlet chamber and the first oil outlet chamber under the elastic action of the valve stem spring. A first oil outlet hole communicating with the first oil outlet chamber is provided at the upper part of the valve body. The second oil outlet chamber and... A piston is movably mounted in the pressure chamber via a piston spring. Under the elastic action of the piston spring, the piston blocks the inlet between the oil inlet chamber and the second oil outlet chamber. The lower part of the valve body is provided with a second oil outlet hole communicating with the second oil outlet chamber. The pressure regulating valve seat is provided with a pressure regulating chamber communicating with the pressure chamber. The two ends of the pressure regulating chamber are provided with a first regulating hole and a second regulating hole. A pressure regulating component is provided in the first regulating hole, and a pressure relief component is provided in the second regulating hole communicating with the outside. The pressure regulating component and the pressure relief component are connected by a pressure regulating spring.

[0008] Furthermore, a threaded valve sleeve is provided at the top of the valve body, and the threaded valve sleeve is engaged with the valve body by a stainless steel snap ring.

[0009] Furthermore, the valve body and the pressure regulating valve seat are connected by threads.

[0010] Furthermore, a sealing assembly is provided on the wall of the second oil outlet chamber of the valve body.

[0011] Furthermore, the pressure regulating assembly includes a first valve core, a pressure regulating screw, a pressure regulating nut, a washer, and an anti-slip nut. One end of the first valve core is connected to the pressure regulating spring, and the other end of the first valve core is connected to the inner side of the pressure regulating valve seat through the pressure regulating screw. The pressure regulating nut, washer, and anti-slip nut are threaded onto the pressure regulating screw and are located sequentially between the inner sides of the first valve core and the pressure regulating valve seat.

[0012] Furthermore, the pressure relief assembly includes a pressure relief plug, a first valve sleeve, a second valve sleeve, a second valve core, and a third valve core. The second valve core is connected to the pressure relief plug through the first valve sleeve. One end of the third valve core is connected to the second valve core through the second valve sleeve. The other end of the third valve core is connected to the pressure regulating spring, and an expansion plug is provided between the third valve core and the pressure regulating valve seat.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] (1) This utility model can adjust the fluid flow rate, pressure and temperature by changing the opening degree of the control element, so as to achieve high-precision flow control;

[0015] (2) The one-in-two-out structural design of this utility model can reduce the number and cost of pipes, improve production efficiency, and has a wide range of applications in various industries. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a precision control valve provided by this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0020] Example

[0021] Please see Figure 1This embodiment provides a precision control valve, including a valve body 1 and a pressure regulating valve seat 2. The bottom end of the valve body 1 is threadedly connected to the pressure regulating valve seat 2, and the top end of the valve body 1 is provided with a threaded valve sleeve 3. The threaded valve sleeve 3 is engaged with the valve body 1 by a stainless steel retaining ring 4. The valve body 1 is divided from top to bottom into a first oil outlet chamber 11, an oil inlet chamber 12, a second oil outlet chamber 13, and a pressure chamber 14. The middle part of the valve body 1 is provided with an oil inlet hole 15 communicating with the oil inlet chamber 12. A sealing valve stem 6 is movably arranged in the first oil outlet chamber 11 by a valve stem spring 5. Under the elastic action of the valve stem spring 5, the sealing valve stem 6 blocks the inlet between the oil inlet chamber 12 and the first oil outlet chamber 11. The upper part of the valve body 1 is provided with a first oil outlet hole 1 communicating with the first oil outlet chamber 11. 6. A piston 8 is movably arranged in the second oil outlet chamber 13 and the pressure chamber 14 through a piston spring 7. Under the elastic action of the piston spring 7, the piston 8 blocks the inlet between the oil inlet chamber 12 and the second oil outlet chamber 13. The lower part of the valve body 1 is provided with a second oil outlet hole 17 communicating with the second oil outlet chamber 13. A step seal assembly 9 is provided on the cavity wall of the second oil outlet chamber 13 of the valve body 1. The pressure regulating valve seat 2 is provided with a pressure regulating chamber 21 communicating with the pressure chamber 14. The two ends of the pressure regulating chamber 21 are provided with a first regulating hole and a second regulating hole. A pressure regulating assembly 22 is provided in the first regulating hole. The second regulating hole is connected to the outside and is provided with a pressure relief assembly 23. The pressure regulating assembly 22 and the pressure relief assembly 23 are connected by a pressure regulating spring 24.

[0022] Specifically, the pressure regulating assembly 22 includes a first valve core 221, a pressure regulating screw 222, a pressure regulating nut 223, a washer 224, and an anti-slip nut 225. One end of the first valve core 221 is connected to the pressure regulating spring 24, and the other end of the first valve core 221 is connected to the inner side of the pressure regulating valve seat 2 through the pressure regulating screw 222. The pressure regulating nut 223, the washer 224, and the anti-slip nut 225 are threaded onto the pressure regulating screw 222 and are located sequentially between the inner side of the first valve core 221 and the inner side of the pressure regulating valve seat 2.

[0023] Specifically, the pressure relief assembly 23 includes a pressure relief plug 231, a first valve sleeve 232, a second valve sleeve 233, a second valve core 234, and a third valve core 235. The second valve core 234 is connected to the pressure relief plug 231 through the first valve sleeve 232. One end of the third valve core 235 is connected to the second valve core 234 through the second valve sleeve 233. The other end of the third valve core 235 is connected to the pressure regulating spring 24, and an expansion plug 236 is provided between the third valve core 235 and the pressure regulating valve seat 2.

[0024] When the valve is in operation, the oil inlet hole 15 on the valve body 1 fills the oil inlet chamber 12 with oil. When the liquid and pressure reach a certain state, the sealing valve stem 6 and piston 8 open, and the liquid is delivered to the operating equipment through the first oil outlet hole 16 and the second oil outlet hole 17 respectively. When the pressure and flow ratio is unbalanced, the pressure can be adjusted by the pressure adjusting nut 223. The pressure adjusting spring 24 and piston 8 control the flow of hydraulic oil, thereby controlling the pressure and liquid flow.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precision control valve, characterized in that: The valve body includes a valve body and a pressure regulating valve seat. The bottom end of the valve body is connected to the pressure regulating valve seat. The valve body is divided from top to bottom into a first oil outlet chamber, an oil inlet chamber, a second oil outlet chamber, and a pressure chamber. An oil inlet hole communicating with the oil inlet chamber is provided in the middle of the valve body. A sealing valve stem is movably installed in the first oil outlet chamber via a valve stem spring. The sealing valve stem blocks the inlet between the oil inlet chamber and the first oil outlet chamber under the elastic action of the valve stem spring. The upper part of the valve body has a first oil outlet hole communicating with the first oil outlet chamber, and the second oil outlet chamber and pressure chamber are also included. A piston is movably mounted in the valve body via a piston spring. Under the elastic action of the piston spring, the piston blocks the inlet between the oil inlet chamber and the second oil outlet chamber. The lower part of the valve body is provided with a second oil outlet hole communicating with the second oil outlet chamber. The pressure regulating valve seat is provided with a pressure regulating chamber communicating with the pressure chamber. The two ends of the pressure regulating chamber are provided with a first regulating hole and a second regulating hole. A pressure regulating component is provided in the first regulating hole, and a pressure relief component is provided in the second regulating hole communicating with the outside. The pressure regulating component and the pressure relief component are connected by a pressure regulating spring.

2. The precision control valve according to claim 1, characterized in that: The top of the valve body is provided with a threaded valve sleeve, which is engaged with the valve body by a stainless steel snap ring.

3. A precision control valve according to claim 1, characterized in that: The valve body and the pressure regulating valve seat are connected by threads.

4. A precision control valve according to claim 1, characterized in that: A sealing assembly is provided on the wall of the second oil outlet chamber of the valve body.

5. A precision control valve according to claim 1, characterized in that: The pressure regulating assembly includes a first valve core, a pressure regulating screw, a pressure regulating nut, a washer, and an anti-slip nut. One end of the first valve core is connected to the pressure regulating spring, and the other end of the first valve core is connected to the inner side of the pressure regulating valve seat through the pressure regulating screw. The pressure regulating nut, washer, and anti-slip nut are threaded onto the pressure regulating screw and are located sequentially between the inner sides of the first valve core and the pressure regulating valve seat.

6. A precision control valve according to claim 1, characterized in that: The pressure relief assembly includes a pressure relief plug, a first valve sleeve, a second valve sleeve, a second valve core, and a third valve core. The second valve core is connected to the pressure relief plug through the first valve sleeve. One end of the third valve core is connected to the second valve core through the second valve sleeve. The other end of the third valve core is connected to the pressure regulating spring, and an expansion plug is provided between the third valve core and the pressure regulating valve seat.

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