Pressure reducing pilot valve for flow regulating valve

Abstract

The pressure reduction pilot valve comprises a valve body, a valve deck, a valve clack and a valve rod, the valve body and the valve deck are matched to form a valve cavity, the valve clack is sleeved with a diaphragm, and the valve cavity is divided into a valve deck cavity and a valve body cavity through the diaphragm; a walking channel, a flow inlet cavity and a flow outlet cavity are formed in the valve body, the flow outlet cavity is communicated with the valve body cavity, the walking channel right faces the diaphragm and is provided with a first section close to the valve clack and a second section opposite to the first section, the valve rod comprises a first valve rod body and a second valve rod body, the first valve rod body vertically penetrates through the valve clack and is matched with the first section, and the flow inlet cavity and the flow outlet cavity are located on the two sides of the walking channel. A first elastic piece elastically connected with the valve clack is arranged in the valve cover cavity, the second valve rod abuts against the first valve rod, the second valve rod is provided with a conical sealing part matched with the second section, and a second elastic piece elastically connected with the second valve rod is installed at the outer side end of the second section. Therefore, the stability of the downstream pressure can be ensured through automatic adjustment of the diaphragm.

Description

Technical Field

[0001] The utility model relates to the technical field of pilot valve equipment, in particular to a pressure-reducing pilot valve for a flow control valve. Background Art

[0002] A pilot valve is generally an auxiliary valve used to control other valves or components. In the existing pilot valves, taking the pilot valve for a flow control valve as an example, it generally uses a manual actuator or an electric actuator for on-site operation on the valve. At the same time, it is also necessary to read the pressure value after the control valve or the flow value flowing through the valve to determine the final adjustment position, which is inconvenient to use. Summary of the Utility Model

[0003] An embodiment of the present application provides a pressure-reducing pilot valve for a flow control valve, which can drive the valve stem to move automatically and directionally through the diaphragm due to the pressure difference between the valve cover cavity and the valve body cavity, so that the outlet pressure of the pilot valve is automatically kept stable and is convenient to use.

[0004] An embodiment of the present application provides a pressure-reducing pilot valve for a flow control valve, including a valve body, a valve cover, a valve flap and a valve stem. The valve body and the valve cover cooperate to form a valve cavity. The valve flap is sleeved with a diaphragm and is arranged between the valve cover and the valve body in a manner of sealing and separating the valve cavity through the diaphragm, so as to separate the valve cavity into a valve cover cavity and a valve body cavity;

[0005] A walking channel, an inlet flow cavity and an outlet flow cavity are arranged in the valve body. The outlet flow cavity communicates with the valve body cavity. The walking channel faces the diaphragm and has a first section close to the valve flap and a second section opposite to the first section. The valve stem includes a first valve stem and a second valve stem. The first valve stem vertically penetrates the valve flap and cooperates with the first section. The inlet flow cavity and the outlet flow cavity are located on both sides of the walking channel and are kept communicating between the first section and the second section. A first elastic member elastically connecting the valve flap is arranged in the valve cover cavity. The second valve stem and the first valve stem are kept in contact. The second valve stem is provided with a conical sealing portion. A fixing frame is arranged at the outer end of the second section. The fixing frame is provided with a second elastic member elastically connecting the second valve stem, so as to gradually block the second section when elastically pushing the second valve stem to move towards the valve flap. The first elastic member, the first valve stem, the second valve stem and the second elastic member are all kept coaxially extended. The second section is used to connect the flow control valve.

[0006] In a possible implementation manner, a flange structure is arranged at one end of the valve body away from the valve cover, and the flange structure faces the walking channel.

[0007] In a possible implementation, a guide sleeve is fixedly arranged in the walking channel. The guide sleeve is sleeved on the first valve stem in a relatively sliding fit manner. One end of the guide sleeve protrudes into the valve body cavity, and a sealing ring is coaxially embedded at the other end of the guide sleeve. The conical sealing portion cooperates with the sealing ring. A flow passage communicating the inflow cavity and the outflow cavity is provided at a position near the middle of the guide sleeve.

[0008] In a possible implementation, both the first elastic member and the second elastic member are implemented as springs.

[0009] In a possible implementation, straight thread joints are installed at the openings of both the inflow cavity and the outflow cavity.

[0010] In a possible implementation, an adjusting needle valve is also integrally installed on the valve body, and the adjusting needle valve communicates with the inflow cavity.

[0011] In a possible implementation, an adjusting screw rod is installed at one end of the valve cover away from the valve body in a threaded fit manner. The adjusting screw rod and the first elastic member are coaxially extended and abut against one end of the first elastic member away from the valve flap.

[0012] In a possible implementation, the adjusting screw rod penetrates through the valve cover, and a rotary adjusting member is fixedly connected to the end protruding from the valve cover.

[0013] In a possible implementation, the rotary adjusting member is implemented as a manual rotary nut or a micro electric actuator.

[0014] Beneficial effects: Compared with the prior art, the pressure reducing pilot valve for a flow regulating valve provided in this application sets a diaphragm in the valve cavity and arranges a first valve stem and a second valve stem that abut against each other in the walking channel. When the pressure behind the valve has a tendency to decrease, the pressure in the valve body cavity gradually becomes smaller than the pressure in the valve cover cavity. The diaphragm drives the second valve stem to move downward through the first valve stem, and the opening degree of the second section gradually increases, enabling the liquid to be gradually and quickly replenished until the pressure in the valve body cavity rises to the level of the pressure in the valve cover cavity, and the pressure behind the valve remains stable. When the pressure behind the valve has a tendency to increase, the diaphragm drives the second valve stem to gradually move upward through the first valve stem, and the opening degree of the second section gradually decreases, making the liquid replenishment speed slower until the pressure behind the valve drops to the level of the pressure in the valve cover cavity, and the pressure behind the valve remains stable. Furthermore, it can automatically adjust the pressure behind the valve to ensure its stability and is convenient to use;

[0015] The valve stem is split, including a first valve stem and a second valve stem that abut against each other, which is more convenient for processing. At the same time, the outer diameter at the second section can also be reduced, saving materials and costs;

[0016] Among them, the flow regulating valve can be conveniently and quickly connected through the flange structure;

[0017] Among them, the regulating needle valve and the valve body are integrated in module design, and the opening degree of the regulating needle valve can be adjusted freely, making it more convenient to use.

[0018] These and other objects, features and advantages of the present utility model are fully embodied through the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The main sectional view structure diagram of the pressure reducing pilot valve for the flow regulating valve of the present application is shown.

[0020] Figure 2 The side sectional view structure diagram of the pressure reducing pilot valve for the flow regulating valve of the present application is shown.

[0021] Figure 3 The schematic diagram of the usage state of the pressure reducing pilot valve for the flow regulating valve of the present application under two conditions is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other embodiments, variations, improvements, equivalent solutions, and other technical solutions that do not depart from the spirit and scope of the present utility model.

[0023] Those skilled in the art should understand that in the disclosure of the specification, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present utility model.

[0024] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the number.

[0025] Refer to Figures 1 to 3, an embodiment of the present application provides a pressure-reducing pilot valve for a flow control valve, including a valve body 10, a valve cover 20, a valve flap 30 and a valve stem. The valve body 10 and the valve cover 20 cooperate to form a valve cavity 201. The valve flap 30 is sleeved with a diaphragm 31 and is arranged between the valve cover 20 and the valve body 10 in a manner of sealing and separating the valve cavity 201, so as to separate the valve cavity 201 into a valve cover cavity 202 and a valve body cavity 203;

[0026] A walking channel 101, an inlet flow cavity 102 and an outlet flow cavity 103 are arranged in the valve body 10. The outlet flow cavity 103 communicates with the valve body cavity 203. The walking channel 101 faces the diaphragm 31 and has a first section 11 close to the valve flap 30 and a second section 12 opposite to the first section 11. The valve stem includes a first valve stem 41 and a second valve stem 42. The first valve stem 41 vertically penetrates the valve flap 30 and cooperates with the first section 11 to seal the first section 11. In addition, the inlet flow cavity 102 and the outlet flow cavity 103 are located on both sides of the walking channel 101 and remain connected between the first section 11 and the second section 12. At the same time, a first elastic member 21 elastically connecting the valve flap 30 is arranged in the valve cover cavity 202. The second valve stem 42 and the first valve stem 41 are kept in contact. The second valve stem 42 is provided with a conical sealing portion 421. At the same time, a fixing frame 13 is arranged at the outer end of the second section 12. The fixing frame 13 is installed with a second elastic member 14 elastically connecting the second valve stem 42, so as to gradually block the second section 12 when elastically pushing the second valve stem 42 to move towards the valve flap 30. At the same time, the first elastic member 21, the first valve stem 41, the second valve stem 42 and the second elastic member 14 all extend coaxially. The second section 12 is used to connect the flow control valve.

[0027] Specifically, during normal operation, the first valve stem 41, the second valve stem 42, the valve flap 30, and the diaphragm 31 remain in a floating state between the first elastic member 12 and the second elastic member 14. When the pressure in the valve body cavity 203 is the same as the pressure in the valve cover cavity 202, they all maintain their inherent states. When the pressure after the valve, that is, the pressure at the outflow cavity 103, shows a downward trend, the pressure in the valve body cavity 203 will gradually be less than the pressure in the valve cover cavity 202, and the previous balance is broken. The diaphragm 31 drives the second valve stem 42 to move downward through the first valve stem 41, and the opening degree between the conical sealing portion 421 and the second section 12 gradually increases. Thus, liquid can be timely replenished into the valve body cavity 203 through the second section 12, so that finally the pressure in the valve body cavity 203 and the pressure in the valve cover cavity 202 are balanced, and the pressure after the valve remains stable. When the pressure after the valve shows an upward trend, the diaphragm 31 drives the second valve stem 42 to move upward through the first valve stem 41, and the opening degree between the conical sealing portion 421 and the second section 12 gradually decreases, reducing the amount of liquid flowing into the valve body cavity 203. Finally, the pressure between the valve body cavity 203 and the valve cover cavity 202 is balanced, and the pressure after the valve remains stable. Therefore, this self-regulating pilot valve is more convenient to use. In addition, the valve stem is no longer a conventional integral structure but a split structure, which is more convenient to process. Moreover, the outer diameter of the second valve stem can be smaller, which can reduce the material cost and save resources.

[0028] Both the first elastic member 12 and the second elastic member 14 are implemented as springs.

[0029] In one embodiment, a flange structure 15 is provided at one end of the valve body 10 away from the valve cover 20. At the same time, the flange structure 15 faces the walking channel 101, so that the top flange on the flow regulating valve can be reduced to be the same as the flange structure 15, which is convenient for quickly connecting the flow regulating valve and occupies a small space.

[0030] In one embodiment, a guide sleeve 16 is provided in the walking channel 101. The guide sleeve 16 is sleeved on the first valve stem 41 in a relatively sliding fit manner. Specifically, the guide sleeve 16 is fixedly arranged in the walking channel 101 and sleeved on the first valve stem 41 at the same time, and the first valve stem 41 can slide up and down in the guide sleeve 16. One end of the guide sleeve 16 protrudes into the valve body cavity 203, so as to limit the valve flap 30 through the protruding part, avoiding the valve flap 30 and the diaphragm 31 from moving down too far, thereby protecting the pilot valve. The other end of the guide sleeve 16 is coaxially embedded with a sealing ring 17, and at the same time, the conical sealing portion 421 is matched with the sealing ring 17 to improve the sealing performance of the conical sealing portion 421, and a flow passage communicating the inflow cavity 102 and the outflow cavity 103 is provided at a position near the middle of the guide sleeve 16.

[0031] In one embodiment, straight thread joints 18 are installed at the openings of the inlet chamber 102 and the outlet chamber 103 to facilitate the connection of external components.

[0032] In one embodiment, the valve body 10 is also integrally installed with an adjusting needle valve 19, and the adjusting needle valve 19 communicates with the inlet chamber 102, so as to realize the integrated design of the adjusting needle valve 19 and the valve body 10. The opening degree of the adjusting needle valve 19 can be freely adjusted without additional piping, making it more convenient to use.

[0033] In one embodiment, an adjusting screw rod 22 is installed at one end of the valve cover 20 away from the valve body 10 in a threaded fit manner. The adjusting screw rod 22 and the first elastic member 12 extend coaxially and abut against one end of the first elastic member 12 away from the valve flap 30, thereby facilitating the adjustment of the initial compression amount of the first elastic member 12, that is, the pressure balance relationship between the valve body chamber 203 and the valve cover chamber 202, so that the pilot valve is suitable for working in different environments and working conditions, and has a wide range of applications.

[0034] Further preferably, the adjusting screw rod 22 penetrates through the valve cover 20, and a rotary adjusting member 23 is fixedly connected to the end protruding from the valve cover 20 to facilitate the rotation of the adjusting screw rod 22.

[0035] Further preferably, the rotary adjusting member 23 is implemented as a manual rotary nut or a micro electric actuator (combined Figure 3 , where the left side is a manual rotary nut and the right side is a micro electric actuator). The micro electric actuator can also be called a micro electric rotator.

[0036] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes, do not represent any order, and cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. A pressure reducing pilot valve for a flow regulating valve, characterized in that: It comprises a valve body, a valve cover, a valve flap and a valve stem, wherein the valve body and the valve cover cooperate to form a valve cavity, the valve flap is provided with a diaphragm, and is arranged between the valve cover and the valve body in a manner of sealing and separating the valve cavity through the diaphragm, so as to separate the valve cavity into a valve cover cavity and a valve body cavity; The valve body is provided with a travel passage, an inlet chamber and an outlet chamber, the outlet chamber is connected to the valve body chamber, wherein the travel passage is opposite to the diaphragm and has a first section close to the valve disc and a second section opposite to the first section, the valve stem includes a first valve stem and a second valve stem, the first valve stem vertically penetrates the valve disc and cooperates with the first section, the inlet chamber and the outlet chamber are located on both sides of the travel passage, and are kept in communication between the first section and the second section, a first elastic member elastically connected to the valve disc is provided in the valve cover chamber, the second valve stem and the first valve stem are kept in abutment, the second valve stem is provided with a conical sealing portion, the second section is provided with a fixing frame at the outer end, the fixing frame is installed with a second elastic member elastically connected to the second valve stem, so that the second section can be gradually blocked when the second valve stem is elastically pushed to move in a direction close to the valve disc, the first elastic member, the first valve stem, the second valve stem and the second elastic member are all kept coaxially extended, and the second section is used to connect the flow regulating valve.

2. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: A flange structure is arranged at one end of the valve body away from the valve cover, and the flange structure faces the walking passage.

3. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: A guide sleeve is fixedly arranged in the travel channel, and the guide sleeve is sleeved on the first valve stem in a relatively sliding manner. One end of the guide sleeve protrudes into the valve body cavity, and a sealing ring is coaxially embedded in the other end of the guide sleeve. The conical sealing portion and the sealing ring cooperate with each other, and the guide sleeve is provided with a flow channel connecting the inlet cavity and the outlet cavity near the middle.

4. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: The first elastic member and the second elastic member are both implemented as springs.

5. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: The openings of the inlet cavity and the outlet cavity are both equipped with straight thread joints.

6. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: The valve body is also integrally mounted with an adjusting needle valve, and the adjusting needle valve is connected to the inlet chamber.

7. The pressure reducing pilot valve for a flow regulating valve according to claim 1, characterized in that: An adjusting screw is installed at one end of the valve cover away from the valve body in a threaded manner. The adjusting screw and the first elastic member extend coaxially and abut against one end of the first elastic member away from the valve disc.

8. The pressure reducing pilot valve for a flow regulating valve according to claim 7, characterized in that: The adjusting screw rod passes through the valve cover, and a rotary adjusting member is fixedly connected to one end protruding from the valve cover.

9. The pressure reducing pilot valve for a flow regulating valve according to claim 8, characterized in that: The rotary adjustment member is implemented as a manually-rotated nut or a micro-electric actuator.

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