CN216590111U

CN216590111U - Double-safety one-way valve

Info

Publication number: CN216590111U
Application number: CN202123156598.8U
Authority: CN
Inventors: 陈亮秀
Original assignee: Wuhan Feituoke Industry Co ltd
Current assignee: Wuhan Feituoke Industry Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-05-24
Anticipated expiration: 2031-12-15

Abstract

The utility model relates to a double-safety one-way valve which comprises a valve body, a valve cap, a valve rod spring, a valve seat, a terminating end, a steel ball spring and an adjusting screw, wherein the valve cap is connected to the valve body, the valve rod is arranged at the lower end of the valve cap, the valve rod spring is arranged at the upper end of the valve cap, the adjusting screw is in threaded connection with the valve cap and can axially compress the valve rod spring, the valve seat is arranged at the lower end of the valve rod, the terminating end is connected to an inlet of the valve body, the steel ball is arranged in the terminating end, and the steel ball spring is arranged between the steel ball and the valve body. According to the utility model, the non-return structure is arranged at the inlet end of the valve, so that a medium is blocked and cannot flow back under the condition that the valve seat is damaged and cannot be sealed, and the effect of double backflow stopping is achieved.

Description

Double-safety one-way valve

Technical Field

The utility model relates to the field of valve control, in particular to a double-safety one-way valve.

Background

One-way valves, also known as check valves or check valves, are commonly used in hydraulic systems to prevent the reverse flow of a medium, and include a valve body, a valve core, and a spring. When the medium in the system flows in the positive direction, if the medium pressure of the inlet is greater than the set pressure of the spring, the valve core pressed by the spring can be pushed away to realize circulation; when the pressure of the medium at the inlet is smaller than the pressure of the spring or the medium flows reversely, the valve core is automatically closed.

In order to avoid abrasion between the valve element and the valve body and to improve sealing performance, the valve element is generally made of a material such as PCTFE or PFA. When the media in the system is mixed with particle impurities, the valve core has the possibility of contacting with the impurities in the opening and closing process, and the sealing effect of the valve core is influenced over time. Once the spool fails, there is a possibility of backflow of the media in the system.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a back pressure one-way valve which comprises a valve body, a valve cap, a valve rod spring, a valve seat, a terminal and an adjusting screw, wherein the valve cap is connected to the valve body, the valve rod is arranged at the lower end of the valve cap, the valve rod spring is arranged at the upper end of the valve cap, the adjusting screw is arranged above the valve rod spring, the valve seat is arranged at the lower end of the valve rod, the terminal is connected to the inlet of the valve body, a steel ball is arranged in the terminal, a steel ball spring is arranged on the right side of the steel ball, and the steel ball presses a transition curved surface of the terminal under the action of the steel ball spring.

Further, an annular groove is formed in the valve rod, and a sealing element is arranged in the annular groove.

Further, a locking screw is arranged above the adjusting screw, and the locking screw is in threaded connection with the valve cap.

The utility model has the advantages that the non-return structure is further arranged at the inlet end of the valve, and even if the valve seat is damaged and cannot be sealed, the medium cannot flow back, so that the effect of double backflow stopping is achieved.

Drawings

FIG. 1 is a schematic view of the closed configuration of the present invention;

FIG. 2 is a schematic view of the present invention in an open configuration;

Detailed Description

To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

Referring to fig. 1-2, the present invention includes a valve body 10, a bonnet 12, a stem 14, a stem spring 16, a valve seat 18, a termination 22, and a set screw 32. The valve body 10 has an inlet and an outlet, and a valve chamber communicating the inlet and the outlet. The bonnet 12 is threaded onto the valve body 10 and a seal 38 is provided at the junction of the bonnet 12 and the valve body 10. The bonnet 12 is generally cylindrical in shape, and the stem 14 is disposed within an internal bore at a lower end of the bonnet 12. to enhance the seal between the stem 14 and the bonnet 12, it is preferred that the stem 14 be provided with an annular groove 30, and a seal 28 be disposed within the annular groove 30. The seal 28 and the seal 38 may be made of a material such as viton, nitrile rubber, or the like. A stem spring 16 is disposed in an internal bore at the upper end of the bonnet 12, and a sliding sleeve 36 is disposed between the stem spring 16 and the stem 14. An adjustment screw 32 is disposed above the stem spring 16, the adjustment screw 32 is threadably coupled to the bonnet 12, and the adjustment screw 32 is axially movable to adjust the amount of compression of the stem spring 16. In a preferred embodiment, a locking screw 34 is further disposed above the adjusting screw 32, the locking screw 34 is threadedly coupled to the bonnet 12, and the locking screw 34 prevents the adjusting screw 32 from loosening and prevents the valve stem 14 from being pushed out of the bonnet 12 due to excessive system pressure.

The lower end of the valve stem 14 is tapered and the valve seat 18 is provided on the tapered surface of the valve stem 14. The valve seat 18 abuts a tapered surface at the end of the inlet flow passage when the valve is closed. The end connection 22 is in threaded connection with the inlet end of the valve body 10, a steel ball 24 is arranged in the end connection 22, the steel ball 24 is pressed on the transition curved surface 20 of the inner wall of the end connection 22 through a steel ball spring 26, and the other end of the steel ball spring 26 abuts against a shaft shoulder at the inlet of the valve body 10. The stiffness and compression of the ball spring 26 are less than the valve stem spring 16, so that the valve can be opened by only meeting the inlet pressure > the valve stem spring set pressure. When the inlet pressure is less than the set pressure of the valve rod spring, the valve is closed. At this time, even if the valve seat 18 can not be completely sealed, the steel ball 24 is tightly attached to the transition curved surface 20 under the combined action of the steel ball spring 26 and the medium pressure of the outlet, so that the outlet medium is prevented from flowing back.

The utility model has been described with reference to a preferred embodiment, to which the above mentioned examples do not limit the utility model, and from reading the present description a person skilled in the art will be able to conceive of numerous modifications and variations to the structure, any obvious alternative being within the scope of protection of the utility model without departing from the inventive concept.

Claims

1. The double-safety one-way valve is characterized by comprising a valve body (10), a valve cap (12), a valve rod (14), a valve rod spring (16), a valve seat (18), a terminating end (22) and an adjusting screw (32), the bonnet (12) is connected to the valve body (10), the valve rod (14) is arranged at the lower end of the bonnet (12), the valve rod spring (16) is arranged at the upper end of the valve cap (12), the adjusting screw (32) is arranged above the valve rod spring (16), the valve seat (18) is arranged at the lower end of the valve rod (14), the termination (22) is connected to the inlet of the valve body (10), a steel ball (24) is arranged in the end joint (22), a steel ball spring (26) is arranged at the right side of the steel ball (24), the steel ball (24) is pressed against the transition curved surface (20) of the end joint (22) under the action of the steel ball spring (26).

2. The double safety check valve according to claim 1, characterized in that an annular groove (30) is provided on the valve stem (14), a seal (28) being provided in the annular groove (30).

3. The double safety check valve as recited in claim 2, characterized in that a locking screw (34) is provided above the adjusting screw (32), the locking screw (34) being threadedly connected to the bonnet (12).