C-shaped metal sealing cage type control valve

Abstract

The utility model belongs to the field of cage type control valves, and particularly relates to a C-shaped metal sealing cage type control valve which comprises a valve body, a valve cover is arranged at the top of the valve body, a valve rod is arranged in the valve cover in a penetrating mode, an upper sleeve is arranged in the valve body, and a lower sleeve is arranged below the upper sleeve. A C-shaped ring is placed in a step between the lower sleeve and the upper sleeve, an opening of the C-shaped ring faces downwards, valve plugs are arranged in the lower sleeve and the upper sleeve, the tops of the valve plugs are fixed to the bottom of the valve rod, the outer sides of the valve plugs make contact with the inner side of the C-shaped ring, and upper gaskets are placed on the upper portion and the lower portion of the top of the upper sleeve respectively. The cage type control valve with the C-shaped metal sealing ring has the remarkable advantages that the application range of the cage type control valve is enlarged, the medium temperature is increased to 566 DEG C while IV-level leakage is guaranteed, and the control problem of working conditions such as high pressure difference, high temperature and tight sealing is solved.

Description

Technical Field

[0001] The utility model relates to the field of cage-type control valves, in particular to a C-type metal-sealed cage-type control valve. Background Art

[0002] The key parts of the cage control valve are the throttling sleeve and the valve plug. The sealing effect between these two parts determines the quality of the product. Usually, sealing rings of different materials and structures can be used between the sleeve and the valve plug to achieve sealing between the sleeve and the valve plug to meet the leakage level requirements of the control valve under different working conditions. Ordinary sealing rings have a variety of different materials and structures such as metal and non-metal, such as: piston rings made of (RTFE+VITON, RTFE+metal), open rings made of high-nickel cast iron, etc. The former has a good sealing effect (Grade IV), but a low operating temperature (maximum around 280 degrees); the latter has a high operating temperature (500+ degrees), but a poor sealing effect (Grade II). For occasions with high medium temperature and strict sealing requirements, the above three sealing types have their own limitations and cannot meet the requirements of high temperature and low leakage at the same time. Therefore, those skilled in the art provide a C-type metal-sealed cage control valve to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to make up for the deficiencies of the prior art, the utility model proposes a C-type metal-sealed cage control valve.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a C-type metal-sealed cage control valve, comprising a valve body, a valve cover is provided on the top of the valve body, a valve stem is inserted into the interior of the valve cover, an upper sleeve is provided inside the valve body, a lower sleeve is provided below the upper sleeve, a C-ring is placed in the step between the lower sleeve and the upper sleeve, the opening of the C-ring is placed downward, and valve plugs are provided inside the lower sleeve and the upper sleeve.

[0005] Preferably, the top of the valve plug is fixed to the bottom of the valve stem, and the outer side of the valve plug contacts the inner side of the C-ring.

[0006] Preferably, upper gaskets are placed above and below the top of the upper sleeve, respectively, and the top of the upper sleeve and the upper gasket are located in the steps of the valve body and the valve cover, respectively.

[0007] Preferably, a lower gasket is placed at the bottom of the lower sleeve, and the lower gasket is located in the step inside the valve body.

[0008] Preferably, the valve body and the valve cover are connected by studs and tightened with nuts.

[0009] The utility model is beneficial in that:

[0010] The utility model adopts a cage control valve with a "C-type metal sealing ring". Its significant advantage is that it expands the application range of the cage control valve. While ensuring Class IV leakage, it increases the medium temperature to 566°, solving the control problems of high pressure difference, high temperature, tight sealing and other working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a schematic structural diagram of the lower sleeve and the upper sleeve of the utility model.

[0014] In the figure: 1. Valve body; 2. Lower gasket; 3. Lower sleeve; 4. C-ring; 5. Upper sleeve; 6. Upper gasket; 7. Valve stem; 8. Valve cover; 9. Stud; 10. Nut; 11. Valve plug. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] The following is combined with Figure 1-2 To further explain this application,

[0017] The embodiment of the present application discloses a C-type metal sealed cage control valve. Figure 1 and Figure 2 , C-type metal sealed cage control valve, including a valve body 1, a valve cover 8 is provided on the top of the valve body 1, a valve stem 7 is inserted into the inside of the valve cover 8, an upper sleeve 5 is provided inside the valve body 1, a lower sleeve 3 is provided below the upper sleeve 5, a C-ring 4 is placed in the step between the lower sleeve 3 and the upper sleeve 5, the opening of the C-ring 4 is placed downward, and a valve plug 11 is provided inside the lower sleeve 3 and the upper sleeve 5.

[0018] Reference Figure 1 and Figure 2The top of the valve plug 11 is fixed to the bottom of the valve stem 7 , and the outer side of the valve plug 11 contacts the inner side of the C-ring 4 .

[0019] Reference Figure 1 and Figure 2 Upper gaskets 6 are placed above and below the top of the upper sleeve 5 respectively. The top of the upper sleeve 5 and the upper gasket 6 are respectively located in the steps of the valve body 1 and the valve cover 8. The setting of the upper gasket 6 ensures a tight seal between the upper sleeve 5 and the valve body 1 and the valve cover 8, ensuring that the medium does not leak between the valve body 1 and the upper sleeve 5 and between the valve body 1 and the valve cover 8.

[0020] Reference Figure 1 and Figure 2 A lower gasket 2 is placed at the bottom of the lower sleeve 3 , and the lower gasket 2 is located in the step inside the valve body 1 .

[0021] Reference Figure 1 and Figure 2 , the valve body (1) and the valve cover (8) are connected by studs (9) and tightened with nuts (10).

[0022] Working principle: When the C-type metal-sealed cage control valve is working, the valve stem 7 drives the valve plug 11 to move up and down. This is the stroke of the control valve. The change in stroke causes the throttling area between the valve plug 11 and the lower sleeve 3 and the upper sleeve 5 to change, thereby achieving the purpose of controlling process parameters such as pressure, temperature, flow and liquid level. When the control valve is closed, the medium retained in the cavity of the valve body 1 flows into the C-ring 4 through the contact surface of the upper sleeve 5 and the lower sleeve 3. Under the action of the pressure of the medium, the C-ring 4 produces elastic deformation, so that the side of the C-ring 4 fits tightly with the valve plug 11, achieving a strict seal on the medium flowing through here, ensuring that the medium does not enter the downstream pipeline, thereby meeting the regulation and control requirements of high temperature and low leakage conditions.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. C-type metal sealed cage control valve, characterized by: The invention comprises a valve body (1), a valve cover (8) is provided on the top of the valve body (1), a valve stem (7) is inserted into the interior of the valve cover (8), an upper sleeve (5) is provided inside the valve body (1), a lower sleeve (3) is provided below the upper sleeve (5), a C-ring (4) is placed in the step between the lower sleeve (3) and the upper sleeve (5), the opening of the C-ring (4) is placed downward, and valve plugs (11) are provided inside the lower sleeve (3) and the upper sleeve (5).

2. The C-type metal-sealed cage control valve according to claim 1, characterized in that: The top of the valve plug (11) is fixed to the bottom of the valve stem (7), and the outer side of the valve plug (11) contacts the inner side of the C-ring (4).

3. The C-type metal-sealed cage control valve according to claim 1, characterized in that: Upper gaskets (6) are respectively placed above and below the top of the upper sleeve (5), and the top of the upper sleeve (5) and the upper gasket (6) are respectively located in the steps of the valve body (1) and the valve cover (8).

4. The C-type metal-sealed cage control valve according to claim 1, characterized in that: A lower gasket (2) is placed at the bottom of the lower sleeve (3), and the lower gasket (2) is located in a step inside the valve body (1).

5. The C-type metal-sealed cage control valve according to claim 1, characterized in that: The valve body (1) and the valve cover (8) are connected by studs (9) and tightened by nuts (10).

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