High-purity pfa diaphragm valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a high-purity pfa diaphragm valve which comprises a base, a valve body is installed on the top of the base, flared nuts are connected to the two ends of the valve body in a threaded mode, an air cavity shell is communicated and fixed to the top of the valve body, a top cover is installed on the top of the air cavity shell, and a mandrel is arranged in the air cavity shell. According to the high-purity pfa diaphragm valve, the base, the valve body, the flaring nut, the air cavity shell, the top cover, the mandrel and the sealing piece are arranged, in the using process of the high-purity pfa diaphragm valve, the whole diaphragm valve is made of pfa materials, and the diaphragm valve has excellent corrosion resistance and high-temperature performance, so that the high-purity pfa diaphragm valve can adapt to various corrosive media and high-temperature using environments; the whole diaphragm valve cannot cause metal pollution to the fluid, so that the possibility of pollution of the process fluid can be reduced to the greatest extent, and meanwhile, the diaphragm valve is pneumatically controlled, convenient and flexible, so that the flow and the pressure of the fluid can be accurately controlled, and the use requirements can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-purity PFA diaphragm valve. Background Art

[0002] The diaphragm valve is a stop valve that uses a diaphragm as an opening and closing member to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. It can be divided into a manual diaphragm valve and a pneumatic diaphragm valve. The diaphragm of the diaphragm valve is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic, and the valve body is mostly made of plastic, fiberglass, ceramic or metal-lined rubber materials. It has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is used for low-pressure, low-temperature, highly corrosive media and media containing suspended matter. However, the current diaphragm valve has poor corrosion resistance and high temperature resistance during use and cannot adapt to various corrosive media and high temperature environments. Therefore, we proposed a high-purity PFA diaphragm valve to solve the above problems. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a high-purity PFA diaphragm valve, which solves the problems raised in the above-mentioned background technology.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] A high-purity PFA diaphragm valve comprises a base, a valve body is installed on the top of the base, both ends of the valve body are threadedly connected with flared nuts, the top of the valve body is connected and fixed with an air cavity shell, a top cover is installed on the top of the air cavity shell, a core shaft is arranged inside the air cavity shell, and the top end of the core shaft slides through the top cover and extends above it.

[0008] Furthermore, mounting blocks are fixed to both side walls of the base, and two mounting holes are provided on the top of each mounting block.

[0009] Furthermore, a first air pipe connecting hole is formed on one side wall of the air cavity shell, and a second air pipe connecting hole is formed on one side wall of the top cover.

[0010] Furthermore, the four bolt countersunk holes opened on the lower surface of the base and the upper surface of the top cover are tightly stuffed with sealing caps.

[0011] Furthermore, the surfaces of the two flared nuts are fixed with anti-skid convex strips in a ring array for increasing the friction of the hand.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a high-purity PFA diaphragm valve, which has the following beneficial effects:

[0014] The utility model, by setting a base, a valve body, a flared nut, an air cavity shell, a top cover, a core shaft and a seal, during the use of this high-purity PFA diaphragm valve, the diaphragm valve is made of PFA material as a whole, has excellent corrosion resistance and high temperature performance, and can adapt to various corrosive media and high-temperature use environments, and the diaphragm valve as a whole will not cause metal pollution to the fluid, thereby minimizing the possibility of process fluid contamination, and at the same time the diaphragm valve adopts pneumatic control, which is convenient and flexible, so that the flow and pressure of the fluid can be accurately controlled to meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first viewing angle;

[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model from a second viewing angle;

[0017] Figure 3 It is a sectional view of the overall structure of the utility model.

[0018] In the figure: 1. base; 2. valve body; 3. flared nut; 4. air cavity shell; 5. top cover; 6. core shaft; 7. mounting block; 8. mounting hole; 9. first air pipe connecting hole; 10. second air pipe connecting hole; 11. sealing cap; 12. anti-slip convex strip. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example

[0021] like Figure 1 , Figure 2 and Figure 3As shown, a high-purity PFA diaphragm valve proposed in an embodiment of the utility model includes a base 1, a valve body 2 is installed on the top of the base 1, both ends of the valve body 2 are threadedly connected with flared nuts 3, the top of the valve body 2 is connected and fixed with an air cavity shell 4, the top of the air cavity shell 4 is installed with a top cover 5, the interior of the air cavity shell 4 is provided with a core shaft 6, the top end of the core shaft 6 slides through the top cover 5 and extends above it, when this high-purity PFA diaphragm valve is used, the up and down movement of the core shaft 6 is controlled by a pneumatic mechanism, so that the opening and closing operation of the diaphragm valve can be controlled, and this PFA diaphragm valve has a simple structure and is easy to maintain, thereby reducing the later maintenance cost.

[0022] like Figure 1 and Figure 2 As shown, in some embodiments, mounting blocks 7 are fixed to both side walls of the base 1, and two mounting holes 8 are provided on the top of the mounting blocks 7, which makes it more convenient to install the diaphragm valve as a whole.

[0023] like Figure 2 and Figure 3 As shown, in some embodiments, a first air pipe connecting hole 9 is opened on one side wall of the air cavity shell 4, and a second air pipe connecting hole 10 is opened on one side wall of the top cover 5. After the air pipe is installed on the diaphragm valve, it is convenient to deliver the gas to the interior of the air cavity shell 4.

[0024] like Figure 1 and Figure 2 As shown, in some embodiments, four bolt counterbores opened on the lower surface of the base 1 and the upper surface of the top cover 5 are tightly stuffed with sealing caps 11, which can provide sealing protection for the installed bolts after the diaphragm valve is installed as a whole.

[0025] like Figure 1 As shown, in some embodiments, the surfaces of the two flared nuts 3 are fixed with anti-slip ridges 12 in a circular array for increasing the friction of the hand. When the flared nuts 3 at both ends of the valve body 2 are rotated, the friction between the hand and the surface of the flared nuts 3 can be enhanced, so as to facilitate the staff to perform the rotation operation.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-purity PFA diaphragm valve, comprising a base (1), characterized in that: A valve body (2) is installed on the top of the base (1), and both ends of the valve body (2) are threadedly connected with flared nuts (3). The top of the valve body (2) is connected and fixed with an air cavity shell (4), and a top cover (5) is installed on the top of the air cavity shell (4). A core shaft (6) is arranged inside the air cavity shell (4), and the top end of the core shaft (6) slides through the top cover (5) and extends above it.

2. The high-purity PFA diaphragm valve according to claim 1, characterized in that: Mounting blocks (7) are fixed to both side walls of the base (1), and two mounting holes (8) are provided on the top of each mounting block (7).

3. The high-purity PFA diaphragm valve according to claim 1, characterized in that: A first air pipe connection hole (9) is formed on one side wall of the air cavity shell (4), and a second air pipe connection hole (10) is formed on one side wall of the top cover (5).

4. The high-purity PFA diaphragm valve according to claim 1, characterized in that: The four bolt countersunk holes formed on the lower surface of the base (1) and the upper surface of the top cover (5) are tightly stuffed with sealing caps (11).

5. The high-purity PFA diaphragm valve according to claim 1, characterized in that: The surfaces of the two flared nuts (3) are both fixed with anti-skid convex strips (12) in a ring array for increasing the friction force of the hand.

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