Low-temperature-resistant clean type isolation valve

Abstract

The utility model relates to pharmaceutical clean cut -off valve technical field, and disclose a kind of low-temperature-resistant clean cut -off valve, comprising: valve seat and valve stem, the inner wall of valve seat is provided with first passage, the valve stem is connected in the first passage of valve seat;The surface of the valve stem is sleeved with bellow, bellow one end is connected with the one end of the valve stem, bellow other end is connected with the valve seat;The bellow isolates the valve stem with the flow medium.The low-temperature-resistant clean cut -off valve, by setting the bellow of being sleeved in the outer portion of valve stem, and the both ends of bellow are connected with valve stem and valve seat respectively, realize the dynamic sealing between valve stem and valve seat, build a dynamic isolation sealing barrier, while allowing the axial movement of valve stem, always effectively prevent the flow medium from contacting with external environment, to solve the problem that the valve stem directly contacts medium or can introduce particle and biological pollution using packing seal, cannot guarantee the asepsis of cut -off process.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical cleanroom isolation valve technology, specifically a low-temperature resistant cleanroom isolation valve. Background Technology

[0002] In industrial fields such as biopharmaceuticals and high-purity electronic chemicals, where strict cleanliness requirements exist for the production environment, sterility and cleanliness during fluid transport are crucial technical indicators. Isolation valves, as key components in fluid control, typically use diaphragm valves to ensure sterility during the isolation process. However, for abnormally low-temperature fluid media, such as liquid nitrogen, which exceed the temperature resistance range of the diaphragm valve diaphragm, some conventional isolation valves can withstand these low temperatures.

[0003] Conventional isolation valves with metal seals can withstand the extreme low-temperature conditions mentioned above. These valves typically use a stuffing box to seal the valve stem. During repeated opening and closing, the valve stem will rub against the packing, which may not only generate particulate contaminants, but also often requires the introduction of lubricant to maintain the seal. This causes the valve stem to come into direct or indirect contact with the flowing medium, becoming a potential source of contamination and failing to meet the sterility requirements of industries such as biopharmaceuticals. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a low-temperature resistant clean isolation valve, which solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a low-temperature resistant clean isolation valve, comprising: a valve seat and a valve stem, wherein the inner wall of the valve seat is provided with a first channel, and the valve stem is connected in the first channel of the valve seat; A bellows is fitted onto the surface of the valve stem, with one end of the bellows connected to one end of the valve stem and the other end connected to the valve seat; the bellows isolates the flowing medium from the valve stem. The top of the valve seat is provided with a drive mechanism that can drive the valve stem to move up and down in the valve seat; The valve stem is provided with a valve stem seal at the top. By controlling the contact and separation between the valve stem seal and the first channel, the flow of the medium flowing through the isolation valve can be controlled.

[0006] Preferably, the bellows includes a bellows section, a first sealing end plate, and a second sealing end plate. The bellows section connects the first sealing end plate and the second sealing end plate. The first sealing end plate is connected to the valve stem, and the second sealing end plate is connected to the top of the inner wall of the valve seat.

[0007] Preferably, a sealed space cavity is formed inside the bellows, which is used to isolate the flowing medium from the valve stem.

[0008] Preferably, the valve seat has an inlet section and an outlet section on both sides, and the inner walls of both the inlet section and the outlet section are provided with a second channel that communicates with the first channel.

[0009] Preferably, the first channel is provided with a sealing surface, and the valve stem seal can contact the sealing surface to achieve a seal.

[0010] Preferably, the valve stem seal is an elastic sealing gasket, which is embedded in the end face of the valve stem.

[0011] Preferably, the driving mechanism is a hydraulic cylinder or a pneumatic cylinder.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This low-temperature resistant cleanroom isolation valve achieves a dynamic seal between the valve stem and the valve seat by installing a bellows fitted around the valve stem and connecting the two ends of the bellows to the valve stem and valve seat respectively. This creates a dynamic isolation sealing barrier, which effectively prevents the flowing medium from contacting the external environment while allowing axial movement of the valve stem. This solves the problem of particle and biological contamination that may be introduced due to direct contact between the valve stem and the medium or the use of packing seals, and the inability to guarantee the sterility of the isolation process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the sealed space cavity structure of this utility model.

[0014] In the figure: 1. Valve seat; 2. Valve stem; 3. First channel; 4. Bellows; 41. Bellows section; 42. First sealing end plate; 43. Second sealing end plate; 44. Sealing space cavity; 5. Drive mechanism; 6. Valve stem seal; 7. Inlet section; 8. Outlet section; 9. Second channel; 10. Sealing surface. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-2A low-temperature resistant cleanroom isolation valve includes: a valve seat 1 and a valve stem 2. The inner wall of the valve seat 1 is provided with a first channel 3. The valve stem 2 is connected in the first channel 3 of the valve seat 1. A bellows 4 is sleeved on the surface of the valve stem 2. One end of the bellows 4 is connected to one end of the valve stem 2, and the other end of the bellows 4 is connected to the valve seat 1. The bellows 4 isolates the flowing medium from the valve stem 2. A drive mechanism 5 is provided on the top of the valve seat 1 to drive the valve stem 2 to move up and down in the valve seat 1. The valve stem 2 is provided with a valve stem seal 6 at the top. By controlling the contact and separation between the valve stem seal 6 and the first channel 3, the opening and closing of the medium flowing through the isolation valve and the flow rate control can be realized.

[0017] Please see Figure 2 The bellows 4 includes a bellows section 41, a first sealing end plate 42, and a second sealing end plate 43. The bellows section 41 connects the first sealing end plate 42 and the second sealing end plate 43. The first sealing end plate 42 is connected to the valve stem 2, and the second sealing end plate 43 is connected to the top of the inner wall of the valve seat 1.

[0018] The bellows 4 forms a sealed space cavity 44 inside, which is used to isolate the flowing medium from the valve stem 2.

[0019] The valve seat 1 is provided with an inlet section 7 and an outlet section 8 on both sides, and the inner walls of both the inlet section 7 and the outlet section 8 are provided with a second channel 9 that communicates with the first channel 3.

[0020] The first channel 3 is provided with a sealing surface 10, and the valve stem seal 6 can contact the sealing surface 10 to achieve a seal.

[0021] The valve stem seal 6 is an elastic sealing gasket, which is embedded in the end face of the valve stem 2.

[0022] The drive mechanism 5 is a hydraulic cylinder or a pneumatic cylinder.

[0023] In one specific embodiment, the valve stem 2 is movably disposed within the first channel 3 of the valve seat. The output end of the drive mechanism 5 is connected to the upper part of the valve stem 2. The drive mechanism 5 uses existing equipment, such as a hydraulic cylinder or a pneumatic cylinder, to drive the valve stem 2 to reciprocate linearly along its axis. The lower end of the valve stem 2 extends into the first channel 3 and is fixedly fitted with a valve stem 2 seal. The valve stem 2 seal is an elastic sealing gasket made of a low-temperature resistant, low-exudation material. When the drive mechanism 5 drives the valve stem 2 downward to its limit position, the valve stem 2 seal forms a tight contact with the sealing surface 10 of the first channel 3, achieving complete fluid shut-off. When the valve stem 2 is lifted upward, fluid can pass through. By precisely controlling the lifting height of the valve stem 2, the flow rate of fluid flowing through the first channel 3 can be adjusted.

[0024] The bellows 4 is fitted onto the outside of the valve stem 2. Its upper and lower ends are respectively equipped with first sealing end plates connected to the valve stem 2, and second sealing end plates connected to the top of the inner wall of the valve seat. Its expandable characteristic allows the valve stem 2 to move freely axially, achieving a dynamic seal between the valve stem 2 and the valve seat, thus constructing a dynamic isolation sealing barrier. While allowing the valve stem 2 to move axially, it effectively prevents the flowing medium from contacting the external environment. Regardless of whether the valve is in an open, closed, or regulating state, the bellows 44 always acts as a reliable physical barrier, effectively preventing wear particles or external contaminants that may be generated during the movement of the valve stem 2 from entering the fluid. It also prevents the fluid from corroding or freezing the valve stem 2, thereby fundamentally ensuring the sterility and cleanliness of the fluid path.

[0025] Before use, sterilization media such as pure steam or superheated water can be introduced into the first channel 3 and the entire fluid cavity connected thereto through the second channel 9 of the inlet section 7 or the second channel 9 of the outlet section 8. Due to the isolation effect of the bellows 44, the sterilization media will not contact the valve seat, the first channel 3, the second channel 9, the valve stem 2 seal, and the outer surface of the bellows 4, but will not enter the sealed space cavity 44 to contact the valve stem 2 connected to the outside. This ensures that all surfaces of the valve that come into contact with the process fluid can be effectively sterilized, further guaranteeing the asepticity during operation.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-temperature resistant cleanroom-type isolation valve, characterized in that, include: A valve seat (1) and a valve stem (2), wherein the inner wall of the valve seat (1) is provided with a first channel (3), and the valve stem (2) is connected in the first channel (3) of the valve seat (1); A bellows (4) is fitted onto the surface of the valve stem (2). One end of the bellows (4) is connected to one end of the valve stem (2), and the other end of the bellows (4) is connected to the valve seat (1). The bellows (4) isolates the flowing medium from the valve stem (2). The top of the valve seat (1) is provided with a drive mechanism (5) that can drive the valve stem (2) to move up and down in the valve seat (1). The valve stem (2) is provided with a valve stem seal (6) at the top. By controlling the contact and separation between the valve stem seal (6) and the first channel (3), the opening and closing of the medium flowing through the isolation valve and the flow rate control can be realized.

2. The low-temperature resistant cleanroom isolation valve according to claim 1, characterized in that, The bellows (4) includes a bellows section (41), a first sealing end plate (42) and a second sealing end plate (43). The bellows section (41) connects the first sealing end plate (42) and the second sealing end plate (43). The first sealing end plate (42) is connected to the valve stem (2), and the second sealing end plate (43) is connected to the top of the inner wall of the valve seat (1).

3. The low-temperature resistant cleanroom-type isolation valve according to claim 1, characterized in that, The bellows (4) forms a sealed space cavity (44) inside, which is used to isolate the flowing medium from the valve stem (2).

4. The low-temperature resistant cleanroom-type isolation valve according to claim 1, characterized in that, The valve seat (1) is provided with an inlet section (7) and an outlet section (8) on both sides, and the inner walls of the inlet section (7) and the outlet section (8) are provided with a second channel (9) that communicates with the first channel (3).

5. A low-temperature resistant cleanroom-type isolation valve according to claim 1, characterized in that, The first channel (3) is provided with a sealing surface (10), and the valve stem seal (6) can contact the sealing surface (10) to achieve sealing.

6. A low-temperature resistant cleanroom-type isolation valve according to claim 1, characterized in that, The valve stem seal (6) is an elastic sealing gasket, which is embedded in the end face of the valve stem (2).

7. A low-temperature resistant cleanroom-type isolation valve according to claim 1, characterized in that, The drive mechanism (5) is a hydraulic cylinder or a pneumatic cylinder.

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