Pneumatic control valve

Abstract

The utility model discloses a pneumatic control valve, including valve body and valve rod, the valve rod inserts the valve body, the valve body has at least opened one gas outlet, two air holes and guide gas ring groove, the edge of guide gas ring groove is arc shape, the valve rod has opened the intercommunication ring groove with guide gas ring groove's matching, and the both sides of intercommunication ring groove all are provided with sealing ring, and through the axial movement of valve rod, change intercommunication ring groove whether with guide gas ring groove misplacement. The utility model is used for adapting the equipment (such as liquid adding gun) of higher frequency of use, realizes the conversion of gas circuit, controls the movement of air cylinder, through the improvement to valve body, has prolonged the service life of sealing washer on valve rod.

Description

Technical Field

[0001] This utility model relates to a control valve, specifically a pneumatic control valve. Background Technology

[0002] In liquefied natural gas (LNG) refueling operations, pneumatic refueling guns are the core equipment for enabling rapid and efficient refueling of mobile equipment such as ships and tank trucks. The reliability and accuracy of their operation primarily rely on their internal pneumatic control valve unit. This control valve receives electrical control signals and drives the valve core to move, thereby controlling the flow of high-pressure LNG.

[0003] However, in practical applications, especially in large LNG receiving terminals or busy refueling hubs, the filling nozzle needs to perform extremely frequent opening and closing operations. This high-frequency, high-intensity operating condition poses a severe challenge to pneumatic control valves, particularly their moving parts. Currently, the most significant failure modes of this control valve are concentrated on the valve stem and sealing assembly.

[0004] As the component that directly performs reciprocating motion, the valve stem's dynamic sealing ring is under high-speed friction for a long time. The edge of the vent chamber of the traditional valve body is a right angle. If the sealing ring enters and exits the vent chamber, the edge of the vent chamber is a right angle. After frequent wear, the sealing ring is very likely to fail prematurely, affecting the normal use of the liquid dispensing gun. Utility Model Content

[0005] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a pneumatic control valve for use with frequently used equipment (such as a liquid filling gun) to realize the conversion of air circuit and control the movement of cylinder; through the improvement of valve body, the service life of the sealing ring on valve stem is extended.

[0006] Specifically, a pneumatic control valve includes a valve body and a valve stem, wherein the valve stem is inserted into the valve body, and the valve body has at least one air outlet, two air vents, and an air guide ring groove, wherein the edge of the air guide ring groove is arc-shaped. The valve stem has a connecting ring groove that matches the air guide ring groove. Sealing rings are provided on both sides of the connecting ring groove. The axial movement of the valve stem changes whether the connecting ring groove is misaligned with the air guide ring groove.

[0007] Optionally, the valve stem is mounted to the valve body by a spring. When the valve stem is not subjected to external force, the two vent holes are not connected under the action of the sealing ring. The spring allows the valve stem to automatically reset and keeps the sealing ring in a normal position.

[0008] Optionally, the valve stem extends through the valve body, which has two air guide grooves and three air outlets, while the valve stem has two connecting grooves. This design enables a two-position five-way valve.

[0009] Optionally, the valve stem has a valve stem handle at its body-exposed end, which is connected to the valve stem end by a screw. The handle facilitates control of valve stem movement.

[0010] Optionally, the valve body is provided with a gasket, which has two strip-shaped through holes. One strip-shaped through hole is connected to one of the vent holes, and the other strip-shaped through hole is connected to the other vent hole. The gasket can be used to change, extend, and connect the air passage, avoiding the need for pipes and thus preventing the structure from being loose.

[0011] This utility model has the following advantages: This invention relates to a pneumatic control valve that significantly improves the lifespan of seals and the reliability of equipment. By optimizing the arc shape of the valve body's air guide ring groove edge, the shearing and wear on the sealing ring during valve stem movement is reduced, thereby significantly extending the service life of the sealing ring. This makes the valve particularly suitable for frequently used equipment (such as liquid filling guns), reducing maintenance frequency and costs, and improving the overall reliability and durability of the equipment.

[0012] The valve stem adopts a spring reset design, which automatically returns to the initial position (usually a safe or non-working state) when the external force is removed. This simplifies the operation process, improves the convenience and safety of operation, and ensures the stable execution of the control logic.

[0013] By employing an integrated design with a through-stem valve, dual air guide ring grooves, and multiple air outlets, complex flow path control functions such as "two-position five-way" can be achieved. Compared to connecting a large number of external pipes, this integrated design has a more compact structure, reduces potential leakage points, and improves space utilization and system integration.

[0014] The handle at the end of the valve stem is connected by screws, facilitating manual operation and application of control force. Meanwhile, the gasket and its slotted through-hole on the valve body provide standardized or customized interfaces, allowing for easy connection, modification, and extension of the air circuit, enabling the valve to flexibly adapt to different installation layouts and pneumatic circuit requirements. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the pneumatic control valve described in Example 1; Figure 2 This is a three-dimensional structural diagram of the pneumatic control valve described in Example 1 from another perspective; Figure 3 This is a cross-sectional view of the pneumatic control valve described in Example 1; Figure 4 This is a three-dimensional structural diagram of the valve stem of the pneumatic control valve described in Example 1; Figure 5 This is a three-dimensional structural diagram of the pneumatic control valve described in Example 2; Figure 6 This is a three-dimensional structural diagram of the pneumatic control valve described in Example 2 from another perspective; Figure 7 This is a cross-sectional view of the pneumatic control valve described in Example 2; Figure 8 This is a three-dimensional structural diagram of the valve stem of the pneumatic control valve described in Example 2; Figure 9 This is a three-dimensional structural diagram of the pad. In the diagram: 100, valve body; 101, air outlet; 102, vent hole; 103, air guide ring groove; 110, gasket; 111, strip-shaped through hole; 120, valve stem; 121, handle; 130, spring; 140, sealing ring. Detailed Implementation

[0016] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0017] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0018] As described in the background section, the valve stem, as a component that directly performs reciprocating motion, has a dynamic sealing ring that is constantly under high-speed friction. The edge of the vent chamber of a traditional valve body is a right angle. If the sealing ring enters and exits the vent chamber, the edge of the vent chamber is a right angle. After frequent wear, the sealing ring is prone to premature failure, affecting the normal use of the dispensing gun.

[0019] For the reasons mentioned above, the present invention provides the following two embodiments.

[0020] Example 1: like Figures 1-4 As shown, a pneumatic control valve includes a valve body 100 and a valve stem 120. The valve stem is inserted into the valve body. The valve body 100 has an air outlet 101, two air vents 102, and an air guide ring groove 103. The edge of the air guide ring groove 103 is arc-shaped. The valve stem 120 has a connecting ring groove 122 that matches the air guide ring groove. Sealing rings 140 are provided on both sides of the connecting ring groove. The axial movement of the valve stem changes whether the connecting ring groove is misaligned with the air guide ring groove.

[0021] The valve stem 120 is mounted on the valve body 100 by a spring 130. When the valve stem is not subjected to external force, the two vent holes are not connected under the action of the sealing ring.

[0022] The valve stem 120 has a valve stem handle 121 (i.e., a handle is installed on the end of the valve stem near the spring side) at the end outside the valve body, which is connected to the end of the valve stem by a screw.

[0023] In this embodiment, the pneumatic control valve is a two-position three-way valve. By optimizing the arc shape of the valve body's air guide ring groove edge, the shearing and wear on the sealing ring during valve stem movement is reduced, thereby significantly extending the service life of the sealing ring. This makes the valve particularly suitable for frequently used equipment (such as liquid filling guns), reducing maintenance frequency and costs, and improving the overall reliability and durability of the equipment. The spring-reset design allows the valve stem to automatically return to its initial position (typically a safe or non-operating state) when the external force is removed, simplifying the operation process, improving operational convenience and safety, and ensuring the stable execution of the control logic.

[0024] To better connect with the air passage of the actuator cylinder, the valve body is provided with a gasket 110, such as... Figure 9 As shown, the gasket has two strip-shaped through holes 111. One strip-shaped through hole communicates with one of the vent holes, and the other strip-shaped through hole communicates with the other vent hole. The gasket and its strip-shaped through holes on the valve body provide standardized or customized interfaces, facilitating the connection, modification, and extension of the air circuit, enabling the valve to flexibly adapt to different installation layouts and pneumatic circuit requirements.

[0025] Example 2: like Figures 5-8 As shown, a pneumatic control valve includes a valve body 100 and a valve stem 120. The valve stem 120 is inserted into the valve body 100. The valve body has three air outlets 101, two air vents 102, and two air guide ring grooves 103. The edges of the air guide ring grooves are arc-shaped. The valve stem 120 has two connecting ring grooves 122 that match the air guide ring groove. A sealing ring is provided on both sides of the connecting ring groove. By moving the valve stem axially, the connection ring groove can be changed to whether it is misaligned with the air guide ring groove.

[0026] The valve stem extends through the valve body 100, and a valve stem handle 121 is provided at the end of the valve stem 100 located outside the valve body. The valve stem handle is connected to the end of the valve stem by a screw.

[0027] In this embodiment, the pneumatic control valve is a two-position five-way valve. By optimizing the arc shape of the valve body's air guide ring groove edge, the shearing and wear on the sealing ring during valve stem movement is reduced, thereby significantly extending the service life of the sealing ring. This makes the valve particularly suitable for frequently used equipment (such as liquid filling guns), reducing maintenance frequency and costs, and improving the overall reliability and durability of the equipment.

[0028] To better connect with the air passage of the actuator cylinder, the valve body is provided with a gasket 100, such as... Figure 9 As shown, the gasket has two strip-shaped through holes 111. One strip-shaped through hole communicates with one of the vent holes, and the other strip-shaped through hole communicates with the other vent hole. The gasket and its strip-shaped through holes on the valve body provide standardized or customized interfaces, facilitating the connection, modification, and extension of the air circuit, enabling the valve to flexibly adapt to different installation layouts and pneumatic circuit requirements.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic control valve, comprising a valve body and a valve stem, wherein the valve stem is inserted into the valve body, characterized in that: The valve body has at least one air outlet, two air vents, and an air guide ring groove, the edge of which is arc-shaped. The valve stem has a connecting ring groove that matches the air guide ring groove. Sealing rings are provided on both sides of the connecting ring groove. The axial movement of the valve stem changes whether the connecting ring groove is misaligned with the air guide ring groove.

2. The pneumatic control valve according to claim 1, characterized in that: The valve stem is mounted to the valve body by a spring. When the valve stem is not subjected to external force, the two vent holes are not connected under the action of the sealing ring.

3. The pneumatic control valve according to claim 1, characterized in that: The valve stem extends through the valve body, which has two air guide ring grooves and three air outlet holes. The valve stem has two connecting ring grooves.

4. The pneumatic control valve according to claim 1, characterized in that: The valve stem has a valve stem handle at the end located outside the valve body, which is connected to the valve stem end by a screw.

5. A pneumatic control valve according to claim 1, characterized in that: The valve body is provided with a gasket, which has two strip-shaped through holes. One strip-shaped through hole is connected to one of the vent holes, and the other strip-shaped through hole is connected to the other vent hole.

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