Chromatographic separation device

Abstract

The utility model relates to a chromatographic separation device which comprises two groups of chromatographic separation towers, each chromatographic separation tower comprises a lower tower body and an upper tower body, the top of each lower tower body and the bottom of each upper tower body are respectively provided with a limiting flange, and the left sides of the two limiting flanges are respectively and fixedly sleeved with an arc-shaped positioning box; first hydraulic cylinders are arranged on the outer side walls, corresponding to the right sides of the two limiting flanges, of the lower tower body and the upper tower body, piston rods of the first hydraulic cylinders are fixedly connected with arc-shaped fixing plates, a plurality of fixing rods are fixedly arranged on one sides of the fixing plates, first through holes are formed in the limiting flanges corresponding to the fixing rods, and a chromatographic column is arranged between the two limiting flanges; the chromatographic column comprises a column tube and chromatographic resin in the column tube, mounting flanges are arranged at the top and the bottom of the column tube, the mounting flanges abut against the limiting flanges on the same side, the left sides of the mounting flanges are inserted into the positioning box in a sleeved mode, second through holes are formed in the positions, corresponding to the first through holes, of the right sides of the mounting flanges, and the fixing rods are inserted into the corresponding first through holes and the corresponding second through holes in a penetrating mode. According to the utility model, the chromatographic column can be quickly disassembled, assembled, replaced and transferred, and the device is more practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of chromatographic separation, and in particular relates to a chromatographic separation device. Background Art

[0002] At present, when purifying amino acid products with insufficient purity, chromatographic devices are often used to achieve separation and purification. In actual chromatographic separation and purification operations, the chromatographic column often needs to be disassembled for cleaning and maintenance after being used for a period of time. However, the chromatographic columns in the existing chromatographic separation system are still difficult and time-consuming to disassemble and assemble, and cannot be quickly transported before and after disassembly and assembly. The use is not flexible and convenient, and is not conducive to subsequent chromatographic separation processing, which needs to be improved. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a chromatographic separation device, which can realize the quick disassembly, replacement and transportation of the chromatographic column to solve the above-mentioned problem.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a chromatographic separation device, including two groups of chromatographic separation towers, the chromatographic separation towers include a lower tower body and an upper tower body arranged above the lower tower body and fixedly connected to the lower tower body through a U-shaped bracket, the tops of the upper tower bodies of the two groups of chromatographic separation towers are connected in parallel to a feed main pipe, the bottom of one side of the lower tower body is connected to a discharge main pipe, the top of the lower tower body and the bottom of the upper tower body are both provided with limiting flanges, the left sides of the two limiting flanges are fixedly sleeved with an arc-shaped positioning box, and the right sides of the two limiting flanges correspond to the lower tower body and the upper tower body A first hydraulic cylinder is vertically fixed on each of the outer walls, a piston rod of the first hydraulic cylinder faces the corresponding limiting flange and is fixedly connected to an arc-shaped fixing plate, a plurality of fixing rods are fixed on one side of the fixing plate close to the corresponding limiting flange, a first through hole is opened on the limiting flange corresponding to the fixing rod, a chromatographic column is arranged between the two limiting flanges, the chromatographic column comprises a column tube and a chromatographic resin filled in the column tube, a mounting flange is arranged on the top and bottom of the column tube, the mounting flange abuts against the limiting flange on the same side, the left side of the mounting flange is inserted into the corresponding positioning box, and the right side of the mounting flange abuts against the first through hole A second through hole is opened at the corresponding position, the fixing plate abuts on the corresponding limiting flange, and the fixing rod is inserted into the corresponding first through hole and second through hole; a transfer vehicle is provided on the right side of the column tube, and the transfer vehicle includes a seat, casters are installed at the four corners of the bottom of the seat, and a second hydraulic cylinder is vertically installed at the four corners of the top, the piston rod of the second hydraulic cylinder is facing upward and fixedly connected to the same support seat, an inverted L-shaped support is fixed on the top of the support seat, and the horizontal part of the support faces the column tube and is fixedly connected to the U-shaped support plate, The opening of the support plate faces the column tube and a third hydraulic cylinder is fixedly mounted on the top of the support plate, the piston rod of the third hydraulic cylinder faces downward and is fixedly connected to a locking plate, a plurality of locking rods are fixedly arranged at the bottom of the locking plate, third through holes are opened on the top and bottom of the support plate corresponding to the locking rods, a mounting block is fixedly arranged at the middle right side of the column tube, the mounting block is inserted into the inner side of the support plate and fourth through holes are opened at positions corresponding to the third through holes, the locking plate abuts against the top of the support plate, and the locking rods pass through the corresponding third through holes and fourth through holes to the bottom of the support plate.

[0005] Preferably, the positioning box is matched with the limiting flange and the mounting flange when in abutment, and the fixing rod is matched with the corresponding first through hole and the second through hole.

[0006] Preferably, a sealing gasket is fixedly provided on a side of the limiting flange close to the column tube and a side of the mounting flange away from the column tube.

[0007] Preferably, the mounting block is matched with the support plate, and the locking rod is matched with the corresponding third through hole and fourth through hole.

[0008] Preferably, the top of the upper tower body is connected in parallel to the tail end of the feed main pipe through a feed delivery pipe, a plurality of feed branch pipes are connected in parallel to the head end of the feed main pipe, and each feed branch pipe is connected to the discharge port of a feed pump.

[0009] Preferably, the bottom end of the feed conveying pipe extends into the upper tower body and is fixedly connected to a liquid distributor.

[0010] Preferably, two discharge branch pipes are connected in parallel to the tail end of the discharge main pipe, and each discharge branch pipe is connected to a feed port of a discharge pump.

[0011] Preferably, the feed conveying pipe, feed branch pipe, discharge main pipe and discharge branch pipe are all provided with automatic valves, and the feed main pipe and discharge main pipe are both provided with flow meters.

[0012] The utility model has the beneficial effects that when in use, only one of the two parallel chromatographic separation towers can be selected for chromatographic separation processing according to needs, and the other set is reserved. The specific chromatographic separation operation is: the corresponding material is fed into the upper tower body through the feed main pipe, so that the material flows from top to bottom, and the chromatographic resin in the chromatographic column can be used to realize the chromatographic separation of the material, and then the material is discharged through the discharge main pipe. After a period of use, the standby unit can be switched to perform chromatographic separation processing, and the chromatographic column of the used unit can be disassembled and replaced, specifically: first operate the second hydraulic cylinder to extend its piston rod, which can drive the seat to move down until the casters are placed on the ground. Then, operate the first hydraulic cylinder to shrink its piston rod, drive the fixed plate to retreat, and pull the fixed rod out of the corresponding first through hole, so that the plug-in fixation of the mounting flange can be released. Then, the entire transfer vehicle is moved by the casters, so that the transfer vehicle moves in the direction away from the chromatographic separation tower, and the mounting flange can be pulled out of the positioning box until the entire chromatographic column is removed from between the upper tower body and the lower tower body, that is, the removal of the original chromatographic column is completed. After that, the entire disassembled chromatographic column can be flexibly moved and transported to the maintenance station by the transfer vehicle. After being transported to the right place, the chromatographic column is first lowered to a suitable height by contracting the piston rod of the second hydraulic cylinder, and then the third hydraulic cylinder is operated to contract its piston rod, driving the locking plate to retract, so that the locking rod is pulled out of the corresponding third through hole, and the plug-in lock of the mounting block can be released, and then the mounting block can be pulled out, and the chromatographic column can be removed from the transfer vehicle, and then it can be cleaned and maintained;

[0013] After unloading the used chromatographic column from the transfer vehicle, another unused chromatographic column can be taken, and the mounting block on it is first inserted into the inner side of the support plate, and then the third hydraulic cylinder is operated to extend its piston rod, drive the locking plate to press against the support plate, and insert the locking rod through the corresponding third through hole and fourth through hole, so that the mounting block can be inserted and locked, and the loading of the chromatographic column is completed. Then, the chromatographic column is transported back to the chromatographic separation tower by the transfer vehicle, and the chromatographic column is adjusted to a suitable height by the extension and contraction of the piston rod of the second hydraulic cylinder, so that it is aligned with the area between the upper tower body and the lower tower body. Then, the transfer vehicle is moved in the direction of the chromatographic separation tower, so that the chromatographic column is inserted between the upper tower body and the lower tower body, and the mounting flange is aligned with the positioning box and inserted into place, that is, the preliminary positioning and installation of the chromatographic column is completed. Then, the first hydraulic cylinder is operated to extend its piston rod, drive the fixing plate to press against the limiting flange, and the fixing rod is inserted through the corresponding first through hole and second through hole, and the mounting flange is inserted and fixed, that is, the fixed installation of the chromatographic column is completed. After that, the second hydraulic cylinder is operated to shrink its piston rod, drive the vehicle seat to move upward, and suspend the casters. In this way, by setting up a parallel unit, and setting a single chromatographic separation tower into a three-section structure consisting of a lower tower body, an upper tower body, and a chromatographic column that can be quickly disassembled and assembled between the upper tower body and the lower tower body, plus the quick disassembly and assembly between the chromatographic column and the transfer vehicle, the chromatographic column can be flexibly and conveniently disassembled, replaced, transported, and loaded and unloaded after being transported to the destination, and the adverse effects on the chromatographic separation operation are greatly reduced, making the overall use more flexible, convenient, and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a main structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the main structure of the lower tower body and the upper tower body of the utility model;

[0016] Figure 3 This is a schematic diagram of the main structure of the positioning box of the utility model;

[0017] Figure 4 It is a schematic diagram of the top view of the positioning box of the utility model;

[0018] Figure 5 It is a bottom view structural diagram of the fixed plate of the utility model;

[0019] Figure 6 This is a schematic diagram of the main structure of the chromatographic column of the utility model;

[0020] Figure 7 It is a schematic diagram of the top view of the mounting flange of the utility model;

[0021] Figure 8 This is a schematic diagram of the main structure of the transfer vehicle of the utility model;

[0022] Fig. 9 It is a schematic diagram of the main structure when the chromatographic column of the utility model is connected with the lower tower body and the upper tower body;

[0023] Fig.10 It is a schematic diagram of the main structure when the chromatographic column of the utility model is connected with the transfer vehicle.

[0024] In the figure, the reference numerals are: 1 is a chromatographic separation tower, 2 is a lower tower body, 3 is a bracket, 4 is an upper tower body, 5 is a feed main pipe, 6 is a discharge main pipe, 7 is a limit flange, 8 is a positioning box, 9 is a first hydraulic cylinder, 10 is a fixing plate, 11 is a fixing rod, 12 is a first through hole, 13 is a chromatographic column, 14 is a column tube, 15 is a chromatographic resin, 16 is a mounting flange, 17 is a second through hole, 18 is a transfer vehicle, 19 is a vehicle seat, 20 is a caster, 21 is the second hydraulic cylinder, 22 is the support seat, 23 is the support seat, 24 is the support plate, 25 is the third hydraulic cylinder, 26 is the locking plate, 27 is the locking rod, 28 is the third through hole, 29 is the mounting block, 30 is the fourth through hole, 31 is the sealing gasket, 32 is the feed delivery pipe, 33 is the feed branch pipe, 34 is the feed pump, 35 is the liquid distributor, 36 is the discharge branch pipe, 37 is the discharge pump, 38 is the automatic valve, and 39 is the flow meter. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods:

[0026] like Figures 1 to 10As shown, a chromatographic separation device comprises two groups of chromatographic separation towers 1, the chromatographic separation towers 1 comprising a lower tower body 2 and an upper tower body 4 arranged above the lower tower body 2 and fixedly connected to the lower tower body 2 through a U-shaped bracket 4, the tops of the upper tower bodies 4 of the two groups of chromatographic separation towers 1 are connected in parallel to a feed main pipe 5, and the bottom of one side of the lower tower body 2 is connected to a discharge main pipe 6. The top of the lower tower body 2 and the bottom of the upper tower body 4 are both provided with a limiting flange 7, the left sides of the two limiting flanges 7 are both fixedly sleeved with an arc-shaped positioning box 8, the right sides of the two limiting flanges 7 are both vertically fixedly provided with a first hydraulic cylinder 9 on the corresponding outer side walls of the lower tower body 2 and the upper tower body 4, the piston rod of the first hydraulic cylinder 9 faces the corresponding limiting flange 7 and is fixedly connected with an arc-shaped fixing plate 10, a plurality of fixing rods 11 are fixedly provided on the side of the fixing plate 10 close to the corresponding limiting flange 7, and a first through hole 12 is opened on the limiting flange 7 corresponding to the fixing rod 11. A chromatographic column 13 is provided between the two limiting flanges 7. The chromatographic column 13 includes a column tube 14 and a chromatographic resin 15 filled in the column tube 14. The top and bottom parts of the column tube 14 are provided with mounting flanges 16. The mounting flange 16 abuts against the limiting flange 7 on the same side and its left side is inserted into the corresponding positioning box 8. A second through hole 17 is opened at a position corresponding to the first through hole 12 on its right side. The fixing plate 10 abuts against the corresponding limiting flange 7, and the fixing rod 11 penetrates and is inserted into the corresponding first through hole 12 and the second through hole 17. A transfer vehicle 18 is provided on the right side of the column tube 14. The transfer vehicle 18 includes a seat 19. Casters 20 are installed at the four corners of the bottom of the seat 19, and second hydraulic cylinders 21 are vertically installed at the four corners of the top. The piston rod of the second hydraulic cylinder 21 faces upward and is fixedly connected to the same support seat 22. An inverted L-shaped support 23 is fixedly provided on the top of the support seat 22. The horizontal part of the support 23 faces the column tube 14 and is fixedly connected to a U-shaped support plate 24. The opening of the support plate 24 faces the column tube 14 and a third hydraulic cylinder 25 is fixedly mounted on the top thereof. The piston rod of the third hydraulic cylinder 25 faces downward and is fixedly connected to a locking plate 26. A plurality of locking rods 27 are fixedly provided at the bottom of the locking plate 26. Third through holes 28 are provided on the top and bottom of the support plate 24 corresponding to the locking rods 27. A mounting block 29 is fixedly provided at the middle portion of the right side of the column tube 14. The mounting block 29 is inserted into the inner side of the support plate 24 and a fourth through hole 30 is provided at a position corresponding to the third through hole 28. The locking plate 26 abuts against the top of the support plate 24. The locking rod 27 passes through the corresponding third through hole 28 and fourth through hole 30 to the bottom of the support plate 24.

[0027] When in use, only one of the two parallel chromatographic separation towers 1 can be selected for chromatographic separation processing according to needs, and the other set is reserved. The specific chromatographic separation operation is: the corresponding material is fed into the upper tower body 4 through the feed main pipe 5, so that the material flows from top to bottom, and the chromatographic resin 15 in the chromatographic column 13 can be used to achieve chromatographic separation of the material, and then the material can be discharged through the discharge main pipe 6. After a period of use, the standby unit can be switched to perform chromatographic separation processing, and the chromatographic column 13 of the used unit can be disassembled and replaced, specifically: first operate the second hydraulic cylinder 21 to extend its piston rod, which can drive the seat 19 to move down until the caster 20 is placed on the ground. Then, operate the first hydraulic cylinder 9 to shrink its piston rod, drive the fixed plate 10 to retreat, and pull the fixed rod 11 out of the corresponding first through hole 12, so that the plug-in fixation of the mounting flange 16 can be released. Next, the entire transfer cart 18 is moved by the casters 20, and the transfer cart 18 is moved in a direction away from the chromatographic separation tower 1, so that the mounting flange 16 can be pulled out of the positioning box 8, until the entire chromatographic column 13 is moved out from between the upper tower body 4 and the lower tower body 2, and the removal of the original chromatographic column 13 is completed. After that, the entire disassembled chromatographic column 13 can be flexibly moved and transported to the maintenance station by the transfer cart 18. After being transported to the right place, the chromatographic column 13 is first lowered to a suitable height by contracting the piston rod of the second hydraulic cylinder 21, and then the third hydraulic cylinder 25 is operated to contract its piston rod, driving the locking plate 26 to retract, so that the locking rod 27 is pulled out from the corresponding third through hole 28, and the plug-in lock of the mounting block 29 can be released. Then the mounting block 29 is pulled out, and the chromatographic column 13 can be removed from the transfer cart 18, and then it can be cleaned and maintained;

[0028] After the used chromatographic column 13 is unloaded from the transporter 18, another unused chromatographic column 13 can be taken, and the mounting block 29 on it is first inserted into the inner side of the support plate 24, and then the third hydraulic cylinder 25 is operated to extend its piston rod, drive the locking plate 26 to press against the support plate 24, and insert the locking rod 27 through the corresponding third through hole 28 and fourth through hole 30, so that the mounting block 29 can be inserted and locked, and the loading of the chromatographic column 13 is completed. Then, the chromatographic column 13 is transported back to the chromatographic separation tower 1 by the transporter 18, and the chromatographic column 13 is adjusted to a suitable height by the extension of the piston rod of the second hydraulic cylinder 21, so that it is aligned with the area between the upper tower body 4 and the lower tower body 2. Then, the transporter 18 is moved toward the direction of the chromatographic separation tower 1, so that the chromatographic column 13 is inserted between the upper tower body 4 and the lower tower body 2, and the mounting flange 16 is aligned with the positioning box 8 and inserted into place, that is, the preliminary positioning and installation of the chromatographic column 13 is completed. Next, the first hydraulic cylinder is operated to extend its piston rod, drive the fixed plate to press against the limiting flange, and make the fixed rod 11 penetrate and insert into the corresponding first through hole 12 and second through hole 17, and insert and fix the mounting flange 16, thus completing the fixed installation of the chromatographic column 13. After that, the second hydraulic cylinder 21 is operated to shrink its piston rod, drive the vehicle seat 19 to move upward, and make the caster 20 suspended. In this way, by setting a parallel unit, and setting a single chromatographic separation tower 1 into a three-section structure consisting of a lower tower body 2, an upper tower body 4, and a chromatographic column 13 that can be quickly disassembled and assembled between the upper tower body 4 and the lower tower body 2, plus the quick disassembly and assembly between the chromatographic column 13 and the transport vehicle 18, the chromatographic column 13 can be flexibly and conveniently disassembled, replaced, transported, and loaded and unloaded after being transported to the right place, and the adverse effects on the chromatographic separation operation are greatly reduced, and the overall use is more flexible, convenient, and more practical.

[0029] In this embodiment, the positioning box 8 is matched with the limiting flange 7 and the mounting flange 16 when in abutment, and the fixing rod 11 is matched with the corresponding first through hole 12 and second through hole 17 to ensure smooth fixing and installation of the chromatographic column 13 .

[0030] In this embodiment, a sealing gasket 31 is fixedly provided on the side of the limiting flange 7 close to the column tube 14 and the side of the mounting flange 16 away from the column tube 14 to ensure the sealing between the chromatographic column 13 and the upper tower body 4 and the lower tower body 2 to avoid leakage.

[0031] In this embodiment, the mounting block 29 is matched with the support plate 24 , and the locking rod 27 is matched with the corresponding third through hole 28 and fourth through hole 30 to ensure the connection and installation between the chromatographic column 13 and the transfer vehicle 18 .

[0032] In this embodiment, the top of the upper tower body 4 is connected in parallel to the tail end of the feed main pipe 5 through a feed delivery pipe 32, and a plurality of feed branch pipes 33 are connected in parallel to the head end of the feed main pipe 5, and each feed branch pipe 33 is connected to the discharge port of a feed pump 34 to facilitate feeding.

[0033] In this embodiment, the bottom end of the feed delivery pipe 32 extends into the upper tower body 4 and is fixedly connected to a liquid distributor 35 for evenly distributing the material onto the chromatographic resin to improve the separation quality.

[0034] In this embodiment, two discharge branch pipes 37 are connected in parallel to the tail end of the discharge main pipe 6. Each discharge branch pipe 37 is connected to the feed port of a discharge pump 38, and is used to discharge the extraction liquid and the residual liquid respectively.

[0035] In this embodiment, the feed delivery pipe 32, the feed branch pipe 33, the discharge main pipe 6 and the discharge branch pipe 37 are all provided with automatic valves 38 to control the on-off of the corresponding pipelines. The feed main pipe 5 and the discharge main pipe 6 are all provided with flow meters 39 to monitor the flow of the corresponding pipelines.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A chromatographic separation device, characterized in that: The invention comprises two groups of chromatographic separation towers, wherein the chromatographic separation towers comprise a lower tower body and an upper tower body arranged above the lower tower body and fixedly connected to the lower tower body through a U-shaped bracket, the tops of the upper tower bodies of the two groups of chromatographic separation towers are connected in parallel to a feed main pipe, the bottom of one side of the lower tower body is connected to a discharge main pipe, the top of the lower tower body and the bottom of the upper tower body are both provided with limiting flanges, the left sides of the two limiting flanges are both fixedly sleeved with an arc-shaped positioning box, the outer side walls of the lower tower body and the upper tower body corresponding to the right sides of the two limiting flanges are both vertically fixedly provided with a first hydraulic cylinder, and the first hydraulic cylinder The piston rod faces the corresponding limiting flange and is fixedly connected with an arc-shaped fixing plate, a plurality of fixing rods are fixedly arranged on one side of the fixing plate close to the corresponding limiting flange, a first through hole is opened on the limiting flange corresponding to the fixing rod, a chromatographic column is arranged between the two limiting flanges, the chromatographic column comprises a column tube and a chromatographic resin filled in the column tube, the top and bottom parts of the column tube are both provided with mounting flanges, the mounting flange abuts against the limiting flange on the same side and its left side is inserted into the corresponding positioning box, and a second through hole is opened at a position corresponding to the first through hole on its right side, The fixing plate abuts against the corresponding limiting flange, and the fixing rod passes through and is inserted into the corresponding first through hole and second through hole; a transfer vehicle is provided on the right side of the column tube, and the transfer vehicle includes a seat, casters are installed at the four corners of the bottom of the seat, and a second hydraulic cylinder is vertically installed at the four corners of the top, the piston rod of the second hydraulic cylinder is facing upward and fixedly connected to the same support seat, an inverted L-shaped support is fixedly provided on the top of the support seat, the horizontal part of the support faces the column tube and is fixedly connected to a U-shaped support plate, and the opening of the support plate faces the column The column tube has a third hydraulic cylinder fixedly mounted on its top, the piston rod of the third hydraulic cylinder faces downward and is fixedly connected to a locking plate, a plurality of locking rods are fixedly arranged at the bottom of the locking plate, third through holes are opened on the top and bottom of the supporting plate corresponding to the locking rods, a mounting block is fixedly arranged at the middle part of the right side of the column tube, the mounting block is inserted into the inner side of the supporting plate and fourth through holes are opened at the positions corresponding to the third through holes, the locking plate abuts against the top of the supporting plate, and the locking rods pass through the corresponding third through holes and fourth through holes to the bottom of the supporting plate.

2. The chromatographic separation device according to claim 1, characterized in that: The positioning box is matched with the limiting flange and the mounting flange when in abutment, and the fixing rod is matched with the corresponding first through hole and the second through hole.

3. The chromatographic separation device according to claim 1, characterized in that: A sealing gasket is fixedly arranged on a side of the limiting flange close to the column tube and a side of the mounting flange away from the column tube.

4. The chromatographic separation device according to claim 1, characterized in that: The mounting block is matched with the support plate, and the locking rod is matched with the corresponding third through hole and fourth through hole.

5. The chromatographic separation device according to claim 1, characterized in that: The top of the upper tower body is connected in parallel to the tail end of the feed main pipe through a feed delivery pipe, and a plurality of feed branch pipes are connected in parallel to the head end of the feed main pipe, and each feed branch pipe is connected to the discharge port of a feed pump.

6. The chromatographic separation device according to claim 5, characterized in that: The bottom end of the feed conveying pipe extends into the upper tower body and is fixedly connected to a liquid distributor.

7. The chromatographic separation device according to claim 5, characterized in that: Two discharge branch pipes are connected in parallel to the tail end of the discharge main pipe, and each discharge branch pipe is connected to the feed port of a discharge pump.

8. The chromatographic separation device according to claim 7, characterized in that: The feed conveying pipe, feed branch pipe, discharge main pipe and discharge branch pipe are all provided with automatic valves, and the feed main pipe and discharge main pipe are both provided with flow meters.

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