Coaxial valve assembly

Abstract

The utility model relates to the technical field of fluid control, in particular to a coaxial valve assembly. Comprising a left end cover, a guide sleeve is connected to the rear end of the left end cover, a right end cover is connected to the end, away from the left end cover, of the guide sleeve, a valve seat is installed on the side, close to the guide sleeve, of the right end cover, and a gasket is arranged at the joint of the valve seat and the guide sleeve; a piston rod assembly matched with the valve seat is arranged in the guide sleeve, the inner wall of the cylinder barrel is fixedly connected with the outer wall of the guide sleeve in an interference fit mode, an annular sealing groove is formed in the end, close to the valve seat, of the piston rod assembly, a polytetrafluoroethylene sealing ring is embedded in the annular sealing groove, and lubricating grease is evenly coated on the surface of the sealing ring. The coaxial valve assembly is compact in structure, stable in connection, reliable in sealing and convenient to maintain, the overall performance of the valve is improved, and the service life of the valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, and in particular to a coaxial valve assembly. Background Technology

[0002] Coaxial valves, as a common fluid control element, are widely used in hydraulic and pneumatic systems. Their core function is to open or close the flow channel through the axial movement of the valve core. Traditional coaxial valve assemblies typically consist of end caps, valve bodies, guide sleeves, valve seats, and piston rods, with these components usually fixed by threaded connections or welding.

[0003] However, such structures still have the following drawbacks in practical applications: the end caps, guide sleeves, and valve bodies of traditional coaxial valves are mostly fixed by a single bolt or welding, resulting in cumbersome assembly procedures. After long-term use, the connections are prone to loosening due to vibration or pressure fluctuations, affecting the overall structural stability. The seal between the piston rod and the valve seat mostly relies on ordinary rubber sealing rings, which are prone to wear due to long-term friction. After the seal fails, fluid leakage is likely to occur. The disassembly and maintenance of existing valve assemblies require disassembling multiple sets of bolts one by one, which is time-consuming and can easily damage parts. If a buffer gasket is not installed between the valve seat and the guide sleeve, the sealing surface is prone to deformation under high pressure impact, further increasing the maintenance frequency and cost. Utility Model Content

[0004] This invention provides a coaxial valve assembly that is compact, has a stable connection, reliable sealing, and is easy to maintain, thereby improving the overall performance and service life of the valve.

[0005] The technical solution adopted by this utility model is as follows: a coaxial valve assembly, including a left end cover, a guide sleeve connected to the rear end of the left end cover, a right end cover connected to the end of the guide sleeve away from the left end cover, a valve seat installed on the side of the right end cover near the guide sleeve, and a gasket provided at the connection between the valve seat and the guide sleeve, a cylinder sleeved on the outside of the guide sleeve, and a piston rod assembly that cooperates with the valve seat provided inside the guide sleeve.

[0006] As a further improvement of this utility model, the left end cover, guide sleeve, and right end cover are connected by multiple double-ended studs.

[0007] As a further improvement of this utility model, the double-ended stud passes through the guide sleeve and its two ends are threadedly connected to the left end cap and the right end cap, respectively. Both ends of the double-ended stud are threadedly connected to hexagonal nuts and spring washers are provided at the connection points on the outside of the double-ended stud.

[0008] As a further improvement of this utility model, the gasket is tightly fitted at the connection between the valve seat and the guide sleeve.

[0009] As a further improvement of this utility model, the inner wall of the cylinder and the outer wall of the guide sleeve are fixedly connected by an interference fit.

[0010] As a further improvement of this utility model, the piston rod assembly is provided with an annular sealing groove at one end near the valve seat, and a polytetrafluoroethylene sealing ring is embedded in the annular sealing groove, and the surface of the sealing ring is uniformly coated with lubricating grease.

[0011] As a further improvement of this utility model, both the left end cover and the right end cover are provided with a plurality of evenly distributed mounting holes.

[0012] The beneficial effects of this utility model are as follows: By adopting a distributed fastening structure with multiple sets of double-ended studs and spring washers, combined with the interference fit design of the cylinder and guide sleeve, this utility model ensures overall coaxiality and vibration resistance stability. At the same time, it significantly reduces friction loss by utilizing the synergistic effect of PTFE sealing rings and lubricating grease. With the high-pressure protection of the buffer gasket between the valve seat and the guide sleeve, it achieves integrated optimization of high valve sealing performance, long service life and rapid maintenance, greatly improving the reliability and economy of the fluid control system. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of a coaxial valve assembly according to this utility model;

[0014] Figure 2 This is a front view of a coaxial valve assembly according to this utility model;

[0015] Figure 3 This is a side view of a coaxial valve assembly according to this utility model.

[0016] As shown in the figure: 1. Cylinder; 2. Piston rod assembly; 3. Guide sleeve; 4. Left end cap; 5. Right end cap; 6. Valve seat; 7. Gasket; 8. Double-ended stud; 9. Spring washer; 10. Hex nut. Detailed Implementation

[0017] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0018] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] This utility model provides the following: Figure 1-3 The coaxial valve assembly shown includes a left end cover 4, a guide sleeve 3 connected to the rear end of the left end cover 4, a right end cover 5 connected to the end of the guide sleeve 3 away from the left end cover 4, a valve seat 6 installed on the side of the right end cover 5 near the guide sleeve 3, and a gasket 7 provided at the connection between the valve seat 6 and the guide sleeve 3, a cylinder 1 sleeved on the outside of the guide sleeve 3, and a piston rod assembly 2 that cooperates with the valve seat 6 is provided inside the guide sleeve 3.

[0021] like Figure 2 As shown, in this utility model, the left end cover 4, guide sleeve 3, and right end cover 5 are connected by multiple double-ended studs 8. The double-ended studs 8 pass through the guide sleeve 3 and are threaded to the left end cover 4 and the right end cover 5 at both ends respectively. Both ends of the double-ended studs 8 are threaded with hexagonal nuts 10, and spring washers 9 are provided at the connection points on the outside of the double-ended studs 8, which further enhances the connection stability between the components and effectively prevents loosening caused by vibration or pressure fluctuations.

[0022] like Figure 1 As shown, in this utility model, the gasket 7 is tightly fitted to the connection between the valve seat 6 and the guide sleeve 3, effectively buffering the direct impact of high-pressure fluid on the sealing surface, protecting the integrity of the sealing surface, further improving the sealing performance and extending the service life.

[0023] like Figure 1 As shown, in this utility model, the inner wall of the cylinder 1 and the outer wall of the guide sleeve 3 are fixedly connected by an interference fit, which ensures the tight connection between the cylinder 1 and the guide sleeve 3 and improves the overall coaxiality and vibration resistance.

[0024] like Figure 1 As shown, in this utility model, the piston rod assembly 2 is provided with an annular sealing groove at one end near the valve seat 6, and a polytetrafluoroethylene sealing ring is embedded in the annular sealing groove. The surface of the sealing ring is uniformly coated with grease, which not only reduces the friction coefficient between the sealing ring and the valve seat 6 and reduces wear, but also further improves the sealing effect through the lubrication of the grease, ensuring the sealing reliability of the coaxial valve assembly under long-term operation.

[0025] like Figure 3 As shown, the left end cover 4 and the right end cover 5 of this utility model are provided with multiple evenly distributed mounting holes, which facilitates the installation of the coaxial valve assembly in the fluid control system and improves the convenience and flexibility of installation.

[0026] Working Principle: In practical implementation, when fluid flow needs to be controlled, the piston rod assembly 2 is driven axially by a drive device. The piston rod assembly 2 cooperates with the valve seat 6 to open or close the flow channel. During the movement of the piston rod assembly 2, the PTFE sealing ring maintains good sealing performance and reduces wear under the lubrication of grease.

[0027] Meanwhile, the interference fit design between cylinder 1 and guide sleeve 3, and the distributed fastening structure of multiple double-ended studs 8 and spring washers 9 between left end cover 4, guide sleeve 3, and right end cover 5, ensure the coaxiality and vibration resistance of the overall structure. Furthermore, the gasket 7 effectively buffers the direct impact of high-pressure fluid on the sealing surface, further improving sealing performance. When maintenance of the coaxial valve assembly is required, simply loosening the hexagonal nut 10 allows for quick disassembly of each component, facilitating repair and replacement.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coaxial valve assembly, comprising a left end cap (4), characterized in that: The left end cap (4) is connected to a guide sleeve (3) at its rear end. The guide sleeve (3) is connected to a right end cap (5) at its end away from the left end cap (4). A valve seat (6) is installed on the right end cap (5) near the guide sleeve (3), and a gasket (7) is provided at the connection between the valve seat (6) and the guide sleeve (3). A cylinder (1) is fitted on the outside of the guide sleeve (3). A piston rod assembly (2) that cooperates with the valve seat (6) is provided inside the guide sleeve (3). The inner wall of the cylinder (1) is fixedly connected to the outer wall of the guide sleeve (3) by an interference fit. An annular sealing groove is provided at the end of the piston rod assembly (2) near the valve seat (6), and a polytetrafluoroethylene sealing ring is embedded in the annular sealing groove. The surface of the sealing ring is uniformly coated with grease.

2. The coaxial valve assembly according to claim 1, characterized in that: The left end cap (4), guide sleeve (3), and right end cap (5) are connected by multiple double-headed studs (8).

3. A coaxial valve assembly according to claim 2, characterized in that: The double-ended stud (8) passes through the guide sleeve (3) and the two ends of the double-ended stud (8) are threaded to the left end cap (4) and the right end cap (5) respectively. Both ends of the double-ended stud (8) are threaded with hexagonal nuts (10) and spring washers (9) are provided at the connection point on the outside of the double-ended stud (8).

4. A coaxial valve assembly according to claim 1, characterized in that: The gasket (7) fits tightly against the connection between the valve seat (6) and the guide sleeve (3).

5. A coaxial valve assembly according to claim 1, characterized in that: Both the left end cap (4) and the right end cap (5) are provided with multiple evenly distributed mounting holes.

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