Movable suction filtration device for laboratory

Abstract

A laboratory movable suction filtration device comprises a suction filtration system, a carrying vehicle and a suction filtration operation frame, a compartment of the carrying vehicle is divided into a plurality of independent compartments through partition plates, the compartments are used for separately arranging different functional composition units forming the suction filtration system, and wheels are arranged at the bottom of the compartment. Push handles used for pushing the carriage to move are arranged on one side or two sides of the upper portion of the carriage, a negative pressure adjusting valve is arranged at the bottom of the suction filtration operation frame, one end of the negative pressure adjusting valve is connected with the suction filtration system, and the other end of the negative pressure adjusting valve is connected with the suction filtration bracket which is fixed to the upper portion of the suction filtration operation frame. And a filter can be inserted into the sealing bush to carry out suction filtration on a liquid-solid mixed sample. The utility model overcomes the defects in the prior art, not only has a complete suction filtration operation function unit, but also can integrally move, can conveniently and timely meet the suction filtration operation requirements of different stations of a laboratory, improves the working efficiency and improves the laboratory environment, thereby having great popularization and application values.

Description

Technical Field

[0001] The utility model relates to a suction filtration device, in particular to a laboratory mobile suction filtration device, and belongs to the technical field of production and manufacturing of experimental devices. Background Art

[0002] Suction filtration is a physical term, also known as reduced pressure filtration or vacuum filtration. It refers to the use of a vacuum pump to reduce the pressure in the suction filtration bottle, causing the liquid and filtrate in the filter on the suction filtration bottle to flow out of the filter medium to achieve solid-liquid separation. It is a conventional decompression operation for solid-liquid separation of solid-liquid mixtures during production or experiments. The suction filtration device refers to equipment or facilities that use vacuum negative pressure as the driving force to achieve solid-liquid separation.

[0003] In modern large laboratories, equipment and pipelines are usually provided to provide centralized negative pressure so that each operating station can perform decompression operations separately.

[0004] However, in some small or old laboratories, since there is no or inability to install a centralized negative pressure generating device, when they need to use vacuum negative pressure as a power source for operations such as decompression tests and filtration, they must use temporary negative pressure generating devices to generate negative pressure, such as vacuum pumps, water flushing pumps, including small glass water flushing pumps, commonly known as water rats, etc. to generate negative pressure.

[0005] Since these temporary negative pressure generating devices have too much power, they will be too large and heavy, making them inconvenient to carry; and if the power is too small, the negative pressure will be insufficient and cannot meet the needs of related operations, which is quite embarrassing; and

[0006] Temporarily assembled negative pressure generating devices often do not have auxiliary functional units such as oil removal, water removal, acid and alkali removal, odor removal and dust removal installed. The materials that need to be filtered are often of many types, some of which will release toxic, harmful or irritating odors, which will not only cause corrosion to metal equipment such as vacuum pumps, but also affect the environment and damage the health of operators. Utility Model Content

[0007] In order to overcome the shortcomings of the prior art, the utility model provides a laboratory mobile filtration device, so as to conveniently and timely meet the filtration operation needs of different workstations in the laboratory, improve work efficiency, improve the laboratory environment, and protect the health of operators. To this end, the following technical solutions are specially adopted:

[0008] A laboratory mobile filtration device, used for filtration by negative pressure to achieve solid-liquid separation of a liquid-solid mixed sample, comprising:

[0009] Filtration system, carrier vehicle and filtration operation frame, including:

[0010] The carrier vehicle comprises a carriage, wherein a partition is provided inside the carriage, wherein the partition is used to divide the interior of the carriage into a plurality of independent compartments, wherein the compartments are used to separately place different functional component units constituting the filtration system, wherein wheels for moving the carriage and being lockable are provided at the bottom of the carriage, and a handle for pushing the carriage is provided on one side or both sides of the upper part of the carriage;

[0011] The filtration operation frame is a multi-layer structural frame erected on the upper part of the carriage, and the bottom of the filtration operation frame is used to set a negative pressure regulating valve, one end of the negative pressure regulating valve is connected to the filtration system, and the other end of the negative pressure regulating valve is connected to the filtration bracket, the filtration bracket is fixed on the upper part of the filtration operation frame, and a sealing bushing is also provided inside the filtration bracket, and the interior of the sealing bushing is used to insert a filter device for solid-liquid separation of the liquid-solid mixed sample.

[0012] Furthermore, the filtration system includes a filtrate storage tank and an air pump, wherein a pipe connected to the air pump is inserted into one side of the top of the filtrate storage tank, and a liquid inlet pipe connected to the negative pressure regulating valve is inserted into the other side of the top of the filtrate storage tank, and the liquid inlet pipe inserted into the filtrate storage tank and connected to the negative pressure regulating valve is longer than the length of the pipe inserted into the filtrate storage tank and connected to the air pump.

[0013] Furthermore, a main valve for closing the liquid inlet pipe of the filtrate storage tank is provided on the connecting pipe of the filtrate storage tank connected to the negative pressure regulating valve, a drain valve for discharging the accumulated liquid inside the filtrate storage tank is provided at the bottom of the filtrate storage tank, a vacuum gauge and a vent valve for releasing the internal vacuum are provided on the top of the filtrate storage tank, and a liquid level gauge for displaying the height of the liquid inside the filtrate storage tank is provided on the tank body of the filtrate storage tank.

[0014] Furthermore, the filtration system also includes an oil-water separator, which is arranged on a pipeline between the filtrate storage tank and the air pump.

[0015] Furthermore, the filtration system also includes a water vapor and alkaline gas remover, which is arranged on the connecting pipe between the oil-water separator and the vacuum pump, and the water vapor and alkaline gas remover is filled with concentrated sulfuric acid, wherein the pipe connected to the oil-water separator is inserted into the concentrated sulfuric acid, and the pipe mouth connected to the vacuum pump is located above the liquid surface of the concentrated sulfuric acid.

[0016] Furthermore, the filtration system also includes an acid gas neutralizer, which is arranged on the connecting pipe between the water vapor and alkaline gas remover and the vacuum pump, and the acid gas neutralizer is filled with granular caustic soda, wherein the pipe connected to the water vapor and alkaline gas remover is inserted into the granular caustic soda, and the pipe mouth connected to the vacuum pump is located above the particle surface of the granular caustic soda.

[0017] Furthermore, the filtration system also includes an integrated deodorizer, which is arranged between the pipe connecting the acid gas neutralizer and the vacuum pump, and is filled with activated carbon and / or color-changing silica gel, wherein the integrated deodorizer is connected to the pipe in the acid gas neutralizer whose pipe mouth is above the granular caustic soda through the pipe at its bottom, and the integrated deodorizer is connected to the air intake pipe of the vacuum pump through the pipe at its upper part.

[0018] Optionally, the vacuum pump is a diaphragm pump or a Roots pump.

[0019] Optionally, the filtering device is a Buchner funnel or a sand core funnel.

[0020] Furthermore, there are a plurality of the negative pressure regulating valves and the filtration brackets connected thereto including the sealing bushings, and the plurality of negative pressure regulating valves are connected in series with the filtration system through their respective connected tees.

[0021] Compared with the prior art, the beneficial effects and improvements of the utility model are:

[0022] The laboratory mobile filtration device provided by the utility model comprises a filtration system, a carrier and a filtration operation frame, wherein the carriage of the carrier is divided into a plurality of independent compartments by a partition plate, which are used to place different functional components constituting the filtration system, and wheels are arranged at the bottom of the carriage, and a push handle for pushing the movement is arranged on one side or both sides of the upper part of the carriage, and a negative pressure regulating valve connected to the filtration system at one end and to the filtration bracket at the other end is arranged at the bottom of the filtration operation frame, and the filtration bracket is fixed to the upper part of the filtration operation frame and is also provided with a sealing bushing inside, and a filter can be inserted into the sealing bushing to filter a liquid-solid mixed sample;

[0023] Obviously, the laboratory mobile filtration device specially provided by the utility model overcomes the shortcomings of the existing technology. It not only has a complete filtration operation functional unit, but also can be moved as a whole. It can conveniently and timely meet the filtration operation needs of different workstations in the laboratory, improve work efficiency, improve the laboratory environment, and can further add auxiliary functional units to ensure the health of operators and the safety of metal equipment. Compared with the existing technology, it has substantial characteristics and progress, and therefore, it is of great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present utility model, a brief introduction to the drawings required for the embodiments of the present utility model is given below.

[0025] Obviously:

[0026] The drawings described below are only drawings of some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, but these other drawings also belong to the drawings required for use in the embodiments of the utility model.

[0027] Figure 1 A schematic structural diagram of a laboratory mobile filtration device provided in an embodiment of the utility model.

[0028] In the figure:

[0029] 110-carriage, 111-partition plate, 120-wheel, 130-handle;

[0030] 210-sucking filter operating frame, 220-negative pressure regulating valve, 230-sucking filter bracket, 231-sealing bushing, 241-Buchner funnel, 242-sand core funnel, 250-tee;

[0031] 310-filtrate storage tank, 311-main valve, 312-drain valve, 313-vacuum gauge, 314-vent valve, 315-liquid level gauge, 320-vacuum pump, 330-oil-water separator, 340-water vapor and alkaline gas remover, 350-acid gas neutralizer, 360-integrated deodorizer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution, beneficial effects and significant progress of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the drawings provided for the embodiments of the utility model. Obviously, all the described embodiments are only partial embodiments of the utility model, rather than all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] It should be noted that the term "comprising" and any variations thereof in the specification and claims of the present utility model are intended to cover non-exclusive inclusions, for example, not only including a series of listed technical features and structural components, but also optionally including unlisted technical features and structural components, or optionally including the connection relationship between these technical features and structural components.

[0034] It should be understood that in the description of the embodiments of the present invention, terms such as "upper", "lower", "top", "bottom" and other indicative orientation or position words are only based on the orientation or position relationship shown in the drawings of the embodiments of the present invention. They are for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element must have a specific orientation, specific orientation structure and operation. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a movable connection, or an integrated connection relationship. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two structural elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0036] It should also be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes therein may not be repeated in some embodiments.

[0037] The technical solution of the present utility model is described in detail below with specific embodiments.

[0038] Example

[0039] This embodiment provides a laboratory mobile filtration device for achieving solid-liquid separation of a liquid-solid mixed sample by filtration through negative pressure.

[0040] like Figure 1 A schematic diagram of the structure of a laboratory mobile filtration device provided by the embodiment of the utility model is shown as follows:

[0041] A laboratory mobile filtration device comprises a filtration system, a carrier vehicle and a filtration operation frame, wherein:

[0042] The carrier vehicle includes a carriage 110, and a partition plate 111 is provided inside the carriage 110. The partition plate 111 is used to divide the interior of the carriage 110 into a plurality of independent compartments, and the compartments are used to separately place different functional components constituting the filtration system. The bottom of the carriage 110 is provided with wheels 120 for moving the carriage 110 and can be locked. A push handle 130 for pushing the carriage 110 is provided on one side or both sides of the upper part of the carriage 110;

[0043] The filtration operation frame 210 is a multi-layer structural frame erected on the upper part of the carriage 110, and the bottom of the filtration operation frame 210 is used to set a negative pressure regulating valve 220, one end of the negative pressure regulating valve 220 is connected to the filtration system, and the other end of the negative pressure regulating valve 220 is connected to the filtration bracket 230, and the filtration bracket 230 is fixed on the upper part of the filtration operation frame 210. A sealing bushing 231 is also provided inside the filtration bracket 230, and the interior of the sealing bushing 231 is used to insert a filter device for solid-liquid separation of liquid-solid mixed samples.

[0044] From the above description, we can see that:

[0045] The laboratory mobile filtration device provided in this embodiment includes a filtration system, a carrier vehicle and a filtration operation frame. It not only has a complete filtration operation functional unit, but is also movable as a whole, and can conveniently and timely meet the filtration operation needs of different workstations in the laboratory, thereby improving its work efficiency and improving the laboratory environment. Compared with the centralized negative pressure system, it has the advantages of low investment, convenience and flexibility. Compared with the temporary negative pressure generating device, it has the advantages of easy use, ability to ensure its efficacy, and ability to meet different filtration needs. Compared with the existing technology, it has substantial characteristics and progress, and therefore, is of great promotion and application value.

[0046] Further, such as Figure 1 As shown:

[0047] The filtration system includes a filtrate storage tank 310 and a vacuum pump 320, wherein:

[0048] A pipe connected to the vacuum pump 320 is inserted on one side of the top of the filtrate storage tank 310, and a liquid inlet pipe connected to the negative pressure regulating valve 220 is inserted on the other side of the top of the filtrate storage tank 310. The liquid inlet pipe inserted into the filtrate storage tank 310 and connected to the negative pressure regulating valve 220 is longer than the length of the pipe inserted into the filtrate storage tank 310 and connected to the vacuum pump 320. In this way, it can be ensured that the negative pressure space and the entry of the filtrate will not interfere with each other.

[0049] Further, from Figure 1 You can also see:

[0050] A main valve 311 for closing the liquid inlet pipe of the filtrate storage tank 310 is also provided on the connecting pipe of the filtrate storage tank 310 connected to the negative pressure regulating valve 220, a drain valve 312 for discharging the accumulated liquid in the filtrate storage tank 310 is provided at the bottom of the filtrate storage tank 310, a vacuum gauge 313 and a vent valve 314 for releasing the internal vacuum are also provided on the top of the filtrate storage tank 310, and a liquid level gauge 315 for displaying the height of the liquid inside the filtrate storage tank 310 is provided on the tank body of the filtrate storage tank 310.

[0051] Obviously, through such a setting, the working status of the filtrate storage tank can be comprehensively controlled and handled in a timely manner, so as to better complete the corresponding filtration work.

[0052] Further, from Figure 1 You can also see:

[0053] The laboratory mobile filtration device provided in this embodiment may further include an oil-water separator 330, a water vapor and alkaline gas remover 340, an acid gas neutralizer 350 and a comprehensive deodorizer 360, wherein:

[0054] The oil-water separator 330 is disposed on the pipeline between the filtrate storage tank 310 and the air pump 320;

[0055] The water vapor and alkaline gas remover 340 is arranged on the connecting pipe between the oil-water separator 330 and the air pump 320. Concentrated sulfuric acid is poured into the water vapor and alkaline gas remover 340. The pipe connected to the oil-water separator 330 is inserted into the concentrated sulfuric acid, and the pipe opening of the pipe connected to the air pump 320 is located above the liquid surface of the concentrated sulfuric acid.

[0056] The acid gas neutralizer 350 is arranged on the connecting pipe between the water vapor and alkaline gas remover 340 and the air pump 320. The acid gas neutralizer 350 is filled with granular caustic soda, wherein the pipe connected to the water vapor and alkaline gas remover 340 is inserted into the granular caustic soda, and the pipe opening of the pipe connected to the air pump 320 is located above the particle surface of the granular caustic soda;

[0057] The integrated deodorizer 360 is arranged between the pipeline connecting the acid gas neutralizer 350 and the vacuum pump 320, and the integrated deodorizer 360 is filled with activated carbon and / or color-changing silica gel, wherein the integrated deodorizer 360 is connected to the pipeline of the acid gas neutralizer 350 whose pipe mouth is above the granular caustic soda through the pipeline at its bottom, and the integrated deodorizer 360 is connected to the air intake pipeline of the vacuum pump 320 through the pipeline at its upper part.

[0058] Obviously, by adding an oil-water separator, a water vapor and alkaline gas remover, an acid gas neutralizer and a comprehensive deodorizer to the original filtration system which only includes a filtrate storage tank and a vacuum pump, the filtration system can not only separate oil and water, but also remove water vapor and alkaline gas, acid gas and various other known or unknown toxic, harmful and odorous gas components in the gas entering the vacuum pump, provide effective anti-corrosion protection for the vacuum pump with metal as the main structure, effectively protect the health of the operator and improve the laboratory environment.

[0059] Optionally, in the laboratory mobile filtration device provided in this embodiment, the vacuum pump 320 can be a diaphragm pump or a Roots pump, and the filtering tool can be a Buchner funnel 241 or a sand core funnel 242, thereby meeting the filtration needs of multi-solid-liquid mixture samples and achieving the purpose of solid-liquid separation.

[0060] Further, from Figure 1 It can also be seen that in the laboratory mobile filtration device provided in this embodiment, there can be multiple negative pressure regulating valves 220 and the filtration bracket 230 connected thereto including the sealing sleeve 231, and the multiple negative pressure regulating valves 220 are respectively connected in series with the filtration system through their respective connected three-way valves 250, so that the simultaneous filtration needs of multiple batches and multiple varieties of solid-liquid mixture samples can be met, thereby improving work efficiency.

[0061] In summary, we can see that:

[0062] The utility model provides a laboratory mobile filtration device, which includes a filtration system, a carrier vehicle and a filtration operation frame;

[0063] When the filter is inserted into the filter bracket fixed on the filter operation frame through the sealing bushing, the filter system is turned on, and the required negative pressure is adjusted through the negative pressure regulating valve according to the filter needs, the liquid-solid mixed sample in the filter can be filtered, and the liquid in the liquid-solid mixed sample and the filtrate with a pore size smaller than the filter medium attached to the bottom of the filter become filtrate and enter the filtrate storage tank in the filtration system, while the solid matter with a particle size larger than the pore size of the filter medium in the liquid-solid mixed sample is deposited on the filter medium to become a filter cake, thereby completing the filtration operation;

[0064] Through further development and optimization, the laboratory mobile filtration device provided by the utility model can remove the oil-water mixture, water vapor and alkaline gas, acid gas and other known or unknown toxic, harmful and smelly gas components contained in the gas extracted during the filtration process by the oil-water separator, water vapor and alkaline gas remover, acid gas neutralizer and comprehensive deodorizer, respectively, to become purified exhaust gas, thereby reducing the erosion of the air pump in the filtration system, effectively protecting the health of the operator and improving the laboratory environment;

[0065] By connecting multiple negative pressure regulating valves and the filtration brackets connected thereto including sealing bushings to the filtration system in series through a tee or the like, simultaneous filtration operations of multiple batches and multiple varieties of solid-liquid mixture samples can be achieved, thereby improving work efficiency;

[0066] It can be seen that the laboratory mobile filtration device provided by the utility model overcomes the shortcomings of the prior art. It not only has a complete filtration operation functional unit, but also can be moved as a whole. It can conveniently and timely meet the filtration operation needs of different workstations in the laboratory, improve work efficiency, and improve the laboratory environment. Compared with the prior art, it has substantial characteristics and progress. Therefore, it is of great promotion and application value.

[0067] In the description of the above manual:

[0068] The descriptions of terms such as "this embodiment", "an embodiment of the utility model", "as shown in...", "further", etc., mean that the specific features, structures, materials or characteristics described in the embodiment are included in at least one embodiment of the utility model. In this specification, the schematic expressions of the above terms are not necessarily for the same embodiment, and the specific features, structures, materials or characteristics described may be combined or combined in a suitable manner in any one or more embodiments; in addition, under the premise that no contradiction arises, a person of ordinary skill in the art may combine or combine the different embodiments and features of different embodiments described in this specification.

[0069] Finally, it should be noted that:

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions described in the embodiments of the present invention. The non-essential improvements, adjustments or replacements made by those skilled in the art based on the contents recorded in this specification are all within the scope of protection required by the present invention.

Claims

1. A laboratory mobile filtration device, used for filtration by negative pressure to achieve solid-liquid separation of liquid-solid mixed samples, characterized in that: include: Filtration system, carrier vehicle and filtration operation frame, including: The carrier vehicle comprises a carriage, wherein a partition is provided inside the carriage, wherein the partition is used to divide the interior of the carriage into a plurality of independent compartments, wherein the compartments are used to separately place different functional component units constituting the filtration system, wherein wheels for moving the carriage and being lockable are provided at the bottom of the carriage, and a handle for pushing the carriage is provided on one side or both sides of the upper part of the carriage; The filtration operation frame is a multi-layer structural frame erected on the upper part of the carriage, and the bottom of the filtration operation frame is used to set a negative pressure regulating valve, one end of the negative pressure regulating valve is connected to the filtration system, and the other end of the negative pressure regulating valve is connected to the filtration bracket, the filtration bracket is fixed on the upper part of the filtration operation frame, and a sealing bushing is also provided inside the filtration bracket, and the interior of the sealing bushing is used to insert a filter device for solid-liquid separation of the liquid-solid mixed sample.

2. The laboratory mobile filtration device according to claim 1, characterized in that: The filtration system comprises a filtrate storage tank and a suction pump; A pipe connected to the vacuum pump is inserted into one side of the top of the filtrate storage tank, and a liquid inlet pipe connected to the negative pressure regulating valve is inserted into the other side of the top of the filtrate storage tank, and the liquid inlet pipe inserted into the filtrate storage tank and connected to the negative pressure regulating valve is longer than the length of the pipe inserted into the filtrate storage tank and connected to the vacuum pump.

3. The laboratory mobile filtration device according to claim 2, characterized in that: The connecting pipe of the filtrate storage tank connected to the negative pressure regulating valve is also provided with a main valve for closing the liquid inlet pipe of the filtrate storage tank, the bottom of the filtrate storage tank is provided with a drain valve for discharging the accumulated liquid inside the filtrate storage tank, the top of the filtrate storage tank is also provided with a vacuum gauge and a vent valve for releasing the internal vacuum, and the tank body of the filtrate storage tank is provided with a liquid level gauge for displaying the height of the liquid inside.

4. The laboratory mobile filtration device according to claim 2, characterized in that: The suction filtration system also includes an oil-water separator, which is arranged on a pipeline between the filtrate storage tank and the air pump.

5. The laboratory mobile filtration device according to claim 4, characterized in that: Also includes: Water vapor and alkaline gas removers; The water vapor and alkaline gas remover is arranged on the connecting pipe between the oil-water separator and the vacuum pump, and concentrated sulfuric acid is poured into the water vapor and alkaline gas remover, wherein the pipe connected to the oil-water separator is inserted into the concentrated sulfuric acid, and the pipe mouth connected to the vacuum pump is located above the liquid surface of the concentrated sulfuric acid.

6. The laboratory mobile filtration device according to claim 5, characterized in that: Also includes: Acid gas neutralizer; The acid gas neutralizer is arranged on the connecting pipe between the water vapor and alkaline gas remover and the vacuum pump, and the acid gas neutralizer is filled with granular caustic soda, wherein the pipe connected to the water vapor and alkaline gas remover is inserted into the granular caustic soda, and the pipe mouth connected to the vacuum pump is located above the particle surface of the granular caustic soda.

7. The laboratory mobile filtration device according to claim 6, characterized in that: Also includes: Integrated deodorizer; The integrated deodorizer is arranged between the pipeline connecting the acid gas neutralizer and the vacuum pump, and is filled with activated carbon and / or color-changing silica gel. The integrated deodorizer is connected to the pipeline in the acid gas neutralizer whose pipe mouth is above the granular caustic soda through the pipeline at its bottom, and the integrated deodorizer is connected to the air intake pipeline of the vacuum pump through the pipeline at its upper part.

8. The laboratory mobile filtration device according to claim 2, characterized in that: The vacuum pump is a diaphragm pump or a Roots pump.

9. The laboratory mobile filtration device according to claim 1, characterized in that: The filtering tool is a Buchner funnel or a sand core funnel.

10. The laboratory mobile filtration device according to claim 1, characterized in that: There are a plurality of the negative pressure regulating valves and the suction filtration brackets connected thereto including the sealing bushings, and the plurality of negative pressure regulating valves are connected in series with the suction filtration system through their respective connected tees.

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