Three-way pilot valve

Abstract

The three-way pilot valve comprises a valve body, a valve deck and a diaphragm, a valve body cavity of the valve body communicates with a pressure sensing channel, the diaphragm and the valve deck are kept in elastic connection, the bottom end of the valve body is connected with an adapter, the valve body is provided with a control cavity, a first connecting channel and a second connecting channel which communicate with one another, and the adapter is provided with a third connecting channel communicating with the control cavity; the diaphragm is vertically connected with a valve rod, the valve rod penetrates through the first connecting channel and penetrates into the control cavity through the valve seat channel in a clearance fit mode, a valve clack is installed in the control cavity, the valve clack is provided with a flow guide channel right facing the third connecting channel, the valve clack is elastically connected with the adapter, and a sealing ring is installed at the top end of the valve clack. When the valve rod ejects away from the valve clack, the flow guide channel is sealed, the first connecting channel and the second connecting channel are communicated, when the valve rod is separated from the valve clack, the valve clack blocks the valve seat channel, the first connecting channel and the third connecting channel are communicated, and therefore the pressure reducing pilot valve and the pressure relief pilot valve can be flexibly switched for use.

Description

Technical Field

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

[0002] A pilot valve is a control mechanism used to operate other valves or components. Currently, most pilot valves on the market are two-way valve structures, that is, they have two interfaces, one inlet and one outlet. They have a single function. High-pressure fluid flows through the pilot valve from the inlet and then flows out from the outlet, that is, the function of draining liquid.

[0003] However, the functionality of this two-way pilot valve is relatively single. For example, it can only be used as a pressure-reducing pilot valve alone, or used as a pressure-relieving pilot valve alone. When used as a pressure-reducing pilot valve, it is used to stabilize the pressure behind the valve, and when used as a pressure-relieving pilot valve, it is used to release the pressure in front of the valve. Therefore, it is greatly restricted during use and is not convenient to use. Summary of the Utility Model

[0004] An embodiment of the present application provides a three-way pilot valve, which can be used as both a pressure-reducing pilot valve and a pressure-relieving pilot valve, has strong functionality and is convenient to use.

[0005] An embodiment of the present application provides a three-way pilot valve, including a valve body, a valve cover, and a diaphragm connected between the valve body and the valve cover. Define the end of the valve cover away from the valve body as the top end, and the opposite end as the bottom end. The valve body has a valve body cavity, and the valve body is provided with a pressure sensing channel communicating with the valve body cavity. The diaphragm and the top end of the valve cover are elastically connected. The bottom end of the valve body is connected with an adapter. The valve body is provided with a control cavity and a first connection channel and a second connection channel communicating with the control cavity. The first connection channel is used to connect the valve cover cavity of the main control valve, and the adapter is provided with a third connection channel communicating with the control cavity;

[0006] The diaphragm is vertically connected with a valve rod. The bottom end of the valve rod vertically penetrates through the first connection channel and penetrates into the control cavity through the valve seat channel in a clearance fit manner. A valve flap is installed in the control cavity. The valve flap is provided with a diversion channel facing the third connection channel. The valve flap and the adapter are elastically connected. A sealing ring is installed on the outer circle of the diversion channel at the top end of the valve flap, so as to seal the diversion channel when the valve rod lifts off the valve flap and keep the first connection channel and the second connection channel communicating. When the valve rod disengages from the valve flap, the valve flap can block the valve seat channel under the action of rebound, so that the first connection channel communicates with the third connection channel through the diversion channel.

[0007] In a possible implementation, tip structures adapted to cooperate with the sealing ring are respectively provided at the bottom ends of the valve stem and the valve seat passage.

[0008] In a possible implementation, a guiding boss is provided at the top end of the adapter. The valve flap is sleeved on the guiding boss in a sliding fit manner. A limiting platform is provided on the outer side of the valve flap. A spring is sleeved on the valve flap, and two ends of the spring respectively abut against the limiting platform and the adapter.

[0009] In a possible implementation, the adapter is provided with a limiting groove adapted to accommodate the spring and the valve flap.

[0010] In a possible implementation, an adjusting screw is installed at the top end of the valve cover. The adjusting screw penetrates through the valve cover in a threaded fit manner and is vertically connected with a spring pressing cover inside the valve cover. An adjusting spring is connected between the diaphragm and the spring pressing cover.

[0011] In a possible implementation, a first locking nut adapted to be sleeved on the adjusting screw is provided at the top end of the valve cover.

[0012] In a possible implementation, an upper pressing plate and a lower pressing plate are respectively connected to two opposite sides of the diaphragm. The valve stem vertically penetrates through the lower pressing plate, the diaphragm and the upper pressing plate in sequence, and a second locking nut is screwed on the end of the valve stem protruding from the upper pressing plate.

[0013] Advantageous effects: Compared with the prior art, the three-way pilot valve provided by the present application can flexibly adjust different functions by connecting different interface positions of the main control valve through different connection channels. That is, when the third connection channel is connected before the valve and the second connection channel is connected after the valve or to the drain, it can be used as a pressure-reducing pilot valve. When the third connection channel is connected after the valve or to the drain and the second connection channel is connected before the valve, it can be used as a pressure-relieving pilot valve. At the same time, during use, no additional pipe is required for liquid supply. It can automatically cut off the liquid supply during drainage or automatically cut off the drainage during liquid supply, saving the use of accessories such as the needle valve at the liquid supply end and reducing the use cost.

[0014] 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

[0015] Figure 1 The cross-sectional structural schematic diagram of the three-way pilot valve of the present application when used as a pressure-reducing pilot valve is shown.

[0016] Figure 2 The side cross-sectional schematic diagram of the three-way pilot valve of the present application when used as a pressure-reducing pilot valve is shown.

[0017] Figure 3 The sectional structural schematic diagram when the three-way pilot valve of the present application is used as a pressure relief pilot valve is shown. Specific embodiments

[0018] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0019] Those skilled in the art should understand that in the disclosure of the specification, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 limiting the present invention.

[0020] It can be understood that the term "one" 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 "one" should not be construed as a limitation on the number.

[0021] Reference Figures 1 to 3 , an embodiment of the present application provides a three-way pilot valve, including a valve body 10, a valve cover 20, and a diaphragm 30 connected between the valve body 10 and the valve cover 20. Define the end of the valve cover 20 away from the valve body 10 as the top end, and the other end opposite thereto as the bottom end, that is, the end of the valve body 10 away from the valve cover 20 is the bottom end. The valve body 10 has a valve body cavity 101, and at the same time, the valve body 10 is provided with a pressure sensing channel 102 communicating with the valve body cavity 101 for connecting a pressure sensor to sense the pressure behind the valve. The diaphragm 30 and the top end of the valve cover 20 are elastically connected. The bottom end of the valve body 10 is connected with a adapter 40, and the valve body 10 is provided with a control cavity 103 and a first connection channel 104 and a second connection channel 105 communicating with the control cavity 103, wherein the first connection channel 104 is used to connect the valve cover cavity of the main control valve, and at the same time, the adapter 40 is provided with a third connection channel 401 communicating with the control cavity 103;

[0022] In addition, it should also be noted that the diaphragm 30 is vertically connected with a valve stem 31. The bottom end of the valve stem 31 vertically penetrates through the first connection channel 104 and passes through the valve seat channel 106 into the control chamber 103 in a clearance fit manner. Meanwhile, a valve flap 50 is installed in the control chamber 103. The valve flap 50 is provided with a diversion channel 501 facing the third connection channel 401, and the valve flap 50 is elastically connected with the adapter 40. In addition, a sealing ring 51 is installed on the outer circle of the diversion channel 501 at the top end of the valve flap 50 to seal the diversion channel 501 when the valve stem 31 moves away from the valve flap 50, and keep the first connection channel 104 and the second connection channel 105 connected. At the same time, when the valve stem 31 disengages from the valve flap 50, the valve flap 50 can block the valve seat channel 106 under the action of rebound, so that the first connection channel 104 is connected with the third connection channel 401 through the diversion channel 501. In this way, when the third connection channel 401 is connected to the front of the valve and the second connection channel 105 is connected to the back of the valve or emptied, this three-way pilot valve can be used as a pressure reducing pilot valve. When the third connection channel 401 is connected to the back of the valve or emptied and the second connection channel 105 is connected to the front of the valve, this three-way pilot valve can be used as a pressure relief pilot valve, with stronger functionality and more convenient use. In addition, this three-way pilot valve can automatically cut off the liquid supply during liquid discharge, or automatically cut off the liquid discharge during liquid supply, and also saves the use of accessories such as the needle valve at the liquid supply end, which can reduce the use cost.

[0023] Specifically, when the third connection channel 401 is connected to the front of the valve and the second connection channel 105 is connected to the back of the valve or emptied, if the pressure sensor senses that the pressure behind the valve increases, the valve stem 31 moves upward close to the valve cover, that is, it disengages from the valve flap 50. The valve flap 50 moves upward under the action of rebound, and the valve flap 50 blocks the valve seat channel 106. At this time, the first connection channel 104 and the second connection channel 105 are disconnected, and the liquid in the valve cover cavity of the main control valve is prohibited from being discharged. At the same time, the first connection channel 104 and the third connection channel 401 are connected, and the high-pressure liquid in front of the valve flows into the valve cover cavity of the main control valve. The liquid in the valve cover cavity increases and does not decrease, and the valve flap of the main control valve moves downward, and the opening of the main control valve decreases, thereby suppressing the increase of the pressure behind the valve; on the contrary, if the pressure behind the valve decreases, the decrease of the pressure behind the valve will ultimately be suppressed, so that the pressure reducing and stabilizing effect of the pressure reducing pilot valve can be achieved.

[0024] When the third connection channel 401 is connected to the valve rear or emptied, and the second connection channel 105 is connected to the valve front, if the pressure sensor senses an increase in the pressure in front of the valve, the valve stem moves upward, and the valve flap 50 moves upward under the action of rebound. The valve flap 50 seals the valve seat channel 106. At this time, the first connection channel 104 and the second connection channel 105 are disconnected, and the high-pressure liquid in front of the valve is prohibited from flowing into the valve cover cavity of the main control valve. At the same time, the first connection channel 104 and the third connection channel 401 are communicated, and the liquid in the main control valve cover cavity is discharged to the valve rear or directly discharged to the outside atmosphere. The main control valve flap moves upward, and the opening degree of the main control valve increases, thereby suppressing the rise of the pressure in front of the valve. On the contrary, when the pressure in front of the valve is sensed to decrease, it will ultimately suppress the decrease of the pressure in front of the valve. Thus, it can play the role of pressure relief and pressure holding of the pressure relief pilot valve.

[0025] In one embodiment, the valve stem 31 and the bottom end of the valve seat channel 106 are respectively provided with tip structures 311 that cooperate with the sealing ring 51. Thus, when performing sealing cooperation, the tip structures 311 can penetrate into the sealing ring 51, which can improve the sealing performance between the valve stem 31, the valve seat channel 106 and the sealing ring 51, and ensure the reliability of the seal.

[0026] In one embodiment, a guiding boss 41 is provided at the top end of the adapter 40. At the same time, the valve flap 50 is sleeved on the guiding boss 41 in a sliding fit manner. Thus, it can ensure the directional movement of the valve flap 50, and further ensure the sealing stability of the sealing ring 51 on the valve flap 50. In addition, a limiting platform 52 is provided on the outer side of the valve flap 50, and a spring 53 is sleeved on the valve flap 50. The two ends of the spring 53 respectively abut against the limiting platform 52 and the adapter 40, so as to provide directional rebound for the valve flap 50 through the spring 53.

[0027] In one embodiment, the adapter 40 is provided with a limiting groove 402 adapted to accommodate the spring 53 and the valve flap 50. Thus, through the limiting effect, the spring 53 can be prevented from skewing during the telescopic process.

[0028] In one embodiment, an adjusting screw 21 is installed at the top end of the valve cover 20. The adjusting screw 21 penetrates through the valve cover 20 in a threaded fit manner and is vertically connected with a spring pressing cover 22 inside the valve cover 20. At the same time, the diaphragm 30 and the spring pressing cover 22 are connected by an adjusting spring 23, so that the initial compression amount of the adjusting spring 23 can be adjusted by rotating the adjusting screw 21, that is, the balance degree of the pressure in front of the valve and the pressure behind the valve can be regulated.

[0029] Further preferably, a first locking nut 24 for sleeving on the adjusting screw 21 is provided at the top end of the valve cover 20 for locking and fixing the adjusting screw 21.

[0030] In one embodiment, upper and lower pressing plates 32 and 33 are respectively connected to opposite sides of the diaphragm 30. At the same time, the valve stem 31 vertically penetrates through the lower pressing plate 33, the diaphragm 30, and the upper pressing plate 32 in sequence. A second locking nut 34 is screwed onto one end of the valve stem 31 protruding from the upper pressing plate 33, so as to enhance the connection strength between the valve stem 31 and the diaphragm 30, and the valve stem 31 can be fastened by the second locking nut 34 to prevent it from detaching from the diaphragm 30.

[0031] It should be noted that the terms "first", "second", and "third" in this application are only for descriptive purposes, do not represent any order, and should not be construed as indicating or implying relative importance. These terms can be interpreted as names.

[0032] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying 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. Three-way pilot valve, characterized in that: It comprises a valve body, a valve cover and a diaphragm connected between the valve body and the valve cover, wherein the end of the valve cover away from the valve body is defined as the top end, and the other end opposite thereto is defined as the bottom end, the valve body has a valve body cavity, the valve body is provided with a pressure sensing channel connected to the valve body cavity, the diaphragm and the top end of the valve cover are elastically connected, the bottom end of the valve body is connected with an adapter, the valve body is provided with a control cavity and a first connecting channel and a second connecting channel connected to the control cavity, wherein the first connecting channel is used to connect to the valve cover cavity of the main control valve, and the adapter is provided with a third connecting channel connected to the control cavity; The diaphragm is vertically connected to a valve stem, the bottom end of the valve stem vertically penetrates the first connecting channel, and penetrates into the control chamber through the valve seat channel in a clearance fit manner, a valve flap is installed in the control chamber, the valve flap is provided with a guide channel facing the third connecting channel, the valve flap and the adapter are elastically connected, a sealing ring is installed at the top end of the valve flap on the outer ring of the guide channel, so that the guide channel can be sealed when the valve stem is pushed away from the valve flap, and the first connecting channel and the second connecting channel are kept connected, and when the valve stem is separated from the valve flap, the valve flap can block the valve seat channel under the action of rebound, thereby keeping the first connecting channel and the third connecting channel connected through the guide channel.

2. The three-way pilot valve according to claim 1, characterized in that: The bottom ends of the valve stem and the valve seat passage are respectively provided with a tip structure matched with the sealing ring.

3. The three-way pilot valve according to claim 1, characterized in that: A guide boss is provided at the top of the adapter, the valve flap is sleeved on the guide boss in a sliding fit manner, a limit platform is provided on the outer side of the valve flap, a spring is sleeved on the valve flap, and two ends of the spring are respectively abutted against the limit platform and the adapter.

4. The three-way pilot valve according to claim 3, characterized in that: The adapter is provided with a limiting groove suitable for accommodating the spring and the valve flap.

5. The three-way pilot valve according to claim 1, characterized in that: An adjusting screw is installed at the top of the valve cover. The adjusting screw penetrates the valve cover in a threaded manner and is vertically connected to a spring pressure cover inside the valve cover. The diaphragm and the spring pressure cover are connected via an adjusting spring.

6. The three-way pilot valve according to claim 5, characterized in that: The top end of the valve cover is provided with a first locking nut for sleeved on the adjusting screw.

7. The three-way pilot valve according to claim 1, characterized in that: The diaphragm is connected to an upper pressure plate and a lower pressure plate on opposite sides respectively, the valve stem vertically penetrates the lower pressure plate, the diaphragm and the upper pressure plate in sequence, and the valve stem is screwed with a second locking nut at one end protruding from the upper pressure plate.

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