KR20100045680A - Pressure energy recovery device driven by gear type rotary valve - Google Patents

Abstract

PURPOSE: A pressure energy recovery device of a seawater desalination system is provided to convert the flow direction of liquid by variably controlling location and rotation speed and to reduce power consumption without using a separate electric motor. CONSTITUTION: A pressure energy recovery device of a seawater desalination system includes the following: a plurality of power recovery chambers(71) with a piston; a high pressure enriched water supply pipe(61); a low pressure enriched water pipe(75); a high pressure seawater discharge pipe(51); a gear type rotary valve block(73) selectively controlling the supply of enriched water and equipped between an enriched water supply pipe and an enriched water discharge pipe; and a rotary valve control unit(74) controlling the gear type rotary valve block.

Description

Pressure energy recovery device driven by gear type rotary valve

The present invention relates to a pressure energy recovery device, and more particularly, to recover the hydraulic power of the pressurized high-pressure concentrated water when discharged the treated water and the concentrated water from which salt is removed from the seawater using a reverse osmosis membrane to drive the seawater supply pump. As applied to the seawater desalination system utilized, the present invention relates to a pressure energy recovery device driven by a gear-type rotary valve that precisely controls the supply of high pressure concentrated water.

In general, to obtain fresh water from seawater, the dissolved or suspended components in seawater must be removed to meet the water and drinking water standards.

Such seawater desalination methods include reverse osmosis membrane methods and electrodialysis methods using special membranes, evaporation methods of desalination by converting seawater into steam, and other methods such as freezing and solar heat.

Until now, the evaporation method using phase change of materials has been widely used for seawater desalination. However, due to the increase in the price of fossil fuel and the development of high efficiency low energy seawater desalination equipment, the reverse osmosis method and the electrodialysis method using membranes have been mainly used for seawater desalination. .

In the seawater desalination plant by the reverse osmosis membrane method, the ionic substances dissolved in the water are filtered out by using a semi-permeable membrane (membrane) through which pure water passes.

In order to separate ionic substances and pure water from seawater, high pressure energy above seawater osmotic pressure is required. This pressure is called reverse osmosis, and seawater requires high pressure of 42 ~ 70bar depending on salinity.

1 is a block diagram showing a seawater desalination system having an energy recovery apparatus according to the prior art.

Referring to FIG. 1, first, seawater is introduced from the sea to store seawater in a raw water storage tank 1, and then sand filtering is performed in the pretreatment unit 2 to remove turbidity.

The pretreated seawater is transferred to the supply tank (3). After storage it is supplied via a low pressure pump 4 for sea water supply.

A portion of the seawater supplied through the low pressure pump 4 is pressurized by the high pressure pump 5 and then supplied to the membrane 6, which is a reverse osmosis module.

Part of the seawater supplied to the membrane 6 is discharged to the treated water from which the salt is removed by reverse osmosis, and the remainder is supplied to the energy recovery device 9 as the concentrated water under high pressure.

The energy recovery device 9 pressurizes the seawater supplied by the low pressure pump 4 using the high pressure of the concentrated water supplied through the membrane 6 to provide the membrane 6 with the low pressure pump 4 and The capacity of the high pressure pump 5 can be reduced, or the power of the electric motors driving the low pressure pump 4 and the high pressure pump 5 can be reduced. At this time, a booster pump 8 for adding pressure to the pressurized seawater provided to the membrane 6 may be added.

Here, the energy recovery device 9 is a pair of power recovery chambers (91; 91a, 91b) having a piston (911; 911a, 911b) therein, respectively, and controls the interception of seawater supplied to the power recovery chamber (91). And a plurality of check valves (94; 94a, 94b, 94c, 94d) and a rotatable plate valve for controlling the piston inside the power recovery chamber 91 to reciprocate alternately.

The rotary plate valve selectively interrupts supply or discharge of concentrated water to the first power recovery chamber 91a and the second power recovery chamber 91b while the rotary plate valve 933 rotates by driving the motor 934. do.

The energy recovery apparatus can reduce the capacity of the low pressure pump 4 and the high pressure pump 5 by recovering and using the hydraulic power of the concentrated water treated in the membrane, or the low pressure pump 4 and the high pressure pump 5 Since the power of the driving electric motor can be reduced, it is possible to save energy.

However, such an energy recovery device has a disadvantage in that a separate electric motor is provided to drive the rotary valve, thereby consuming power for driving the electric motor.

An object of the present invention for improving the disadvantages of the background art, by using the gear-type rotary valve to control the inflow and discharge of the concentrated water, the rotation of the gear-type rotary valve using the hydraulic power from the brine supply line The present invention provides a pressure energy recovery device driven by a gear-type rotary valve capable of reducing the size of the device by controlling the flow and controlling the flow and direction of the high speed fluid.

Pressure energy recovery device driven by the gear-type rotary valve of the present invention for solving the above problems includes a plurality of power recovery chamber having a piston therein, high pressure concentrated water supply pipe, low pressure concentrated water discharge pipe, high pressure sea water discharge pipe In the energy recovery device of the seawater desalination apparatus to discharge the treated water and the concentrated water from which salt is removed from the seawater by using reverse osmosis, and to recover the hydraulic power of the high pressure concentrated water to drive the seawater supply pump. And a gear type rotary valve block disposed between a water supply pipe and the concentrated water discharge pipe to selectively control the supply of concentrated water to the respective power recovery chambers, and a rotary valve control means for controlling the gear type rotary valve block.

The gear-type rotary valve block may include a first block having a concentrated water supply hole communicating with the high pressure concentrated water supply pipe, a chamber connection hole communicating with each of the power recovery chambers, and a concentrated water discharge hole communicating with the low pressure concentrated water discharge pipe; Each of the power recovery chambers is formed by closing one side of the first block and forming a predetermined space portion, the second block being positively pressure-beared by the mutual supply water pressure with the first block, and the rotation provided in the space portion of the second block. And geared valves to selectively control the inflow and discharge of the brine into the furnace.

The gear-type valve may be any one selected from a pair of external gear valves, internal gear valves, and gator valves.

In addition, the rotary valve control means is a gear valve through the one side of the second block to drive the gear valve with the hydraulic power of the branch line branched from the concentrated water supply pipe and the high pressure concentrated water supplied through the branch line It can be composed of a hydraulic actuator provided connected to.

One side of the hydraulic actuator may be provided with a proportional control valve or a servo valve for controlling the rotation of the gear-type valve.

One side of the hydraulic actuator may be further provided with a rotation angle measuring sensor and the direction switching valve.

The present invention comprises a valve for supplying concentrated water to the power recovery chamber as a gear-type rotary valve, the hydraulic actuator which can stop the drive of the gear-type rotary valve at any angle and can change the speed, the hydraulic actuator By using the hydraulic power of the recovered concentrated water, the power consumption can be reduced by not using a separate electric motor, and by controlling the rotation speed and position variably, there is an advantage that can quickly change the flow direction of the fluid have.

2 is a configuration diagram of a pressure energy recovery device driven by a gear type rotary valve according to a first embodiment of the present invention, FIG. 3 is a perspective view of a gear type rotary valve block of FIG. 2, and FIG. 4 is a front exploded perspective view of FIG. 3. FIG. 5 is a rear exploded perspective view of FIG. 3, wherein the present invention discharges treated water and concentrated water from which salt is removed from seawater by using reverse osmosis and recovers hydraulic power of high-pressure concentrated water to drive a seawater supply pump. It relates to a pressure energy recovery device driven by a gear-type rotary valve of the seawater desalination apparatus.

Here, the same reference numerals apply to the same components as those of FIG. 1 described above among the reference numerals of FIG.

Referring to Figure 2, the pressure energy recovery device driven by the gear-type rotary valve of the present invention, a plurality of power recovery chamber 71, high pressure concentrated water supply pipe 61, low pressure concentrated water discharge pipe 75, high pressure seawater discharge pipe (51), gear type rotary valve block 73, rotary valve control means 74.

Although the power recovery chamber 71 is illustrated as being composed of a first power recovery chamber 71a and a second power recovery chamber 71b in the drawing, this is only one embodiment, and a plurality of power recovery chambers may be applied.

Each of the power recovery chambers 71; 71a and 71b has concentrated water ports 72a and 72b through which concentrated water flows in and out, and seawater inflows and discharges into the other side of the concentrated water ports 72a and 72b. Ports 72c and 72d are formed, respectively.

In addition, a piston is provided inside the first power recovery chamber 71a and the second power recovery chamber 71b.

The piston may be a ball piston or an elliptical piston which has a rolling motion in each of the power recovery chambers 71; 71a and 71b, respectively. In the embodiment of the present invention, the piston is illustrated as an elliptical piston. Other forms, for example, cylindrical pistons and the like can be used.

Pistons 711a and 711b reciprocate in the chamber without a piston rod, which serves to prevent mixing of concentrated water and seawater, and serves as a means of transmitting pressure to the seawater introduced by the pressure of the concentrated water. As the ball piston is in linear contact with the chamber inner wall, there is little frictional resistance.

The low pressure seawater supply pipe 41 and the first power recovery chamber 71a, which are connected to the first power recovery chamber 71a and the second power recovery chamber 71b, respectively, and supply low pressure seawater to the seawater ports 72c and 72d, It has a high-pressure seawater discharge pipe 51 for pressurizing low-pressure seawater by the piston 711 (711a, 711b) driving pressure in the second power recovery chamber 71b to supply high-pressure seawater through the boost pump 8 to the membrane. .

At this time. The low pressure seawater supply to the first power recovery chamber 71a and the second power recovery chamber 71b and the high pressure seawater discharge pipe 51 to the high pressure seawater discharge pipe 51 are connected to the low pressure seawater supply pipe 41 and the high pressure seawater discharge pipe 51. Multiple check valves 76; 76a, 76b, 76c, and 76d may be provided for intermittent supply.

Here, the plurality of check valves 76; 76a, 76b, 76c, and 76d are provided to the first check valve 76a and the first power recovery chamber 71a for supplying low pressure seawater to the first power recovery chamber 71a. To the high pressure seawater discharge pipe 51 of the high pressure seawater pressurized by the second check valve 76b intermittently supplied to the high pressure seawater discharge pipe 51 of the high pressure seawater pressurized by the second power recovery chamber 71b. And a fourth check valve 76d for supplying low pressure seawater to the second power recovery chamber 71b.

Then, the concentrated water supply pipe 61 is supplied with the concentrated water of high pressure except the treated water discharged by removing the salt through the conventional membrane 6, the first power recovery chamber (91a) and the second power recovery chamber ( And a brine discharge pipe 75 for discharging the brine from 91b) to the outside.

According to a characteristic aspect of the present invention, the gear-type rotary valve block 73 is provided between each of the power recovery chambers (71; 71a, 71b) and the brine water supply pipe (61) and the brine discharge pipe (75) To selectively regulate the supply of brine to the power recovery chamber.

To this end, the gear-type rotary valve block 73 includes a first block 731, a second block 732 and a gear-type valve 733 which are mutually positive pressure bearing by the feed water pressure.

The first block 731 communicates with the concentrated water supply hole P communicating with the high pressure concentrated water supply pipe 61, the chamber connecting holes A1 and B1 communicating with each of the power recovery chambers, and the low pressure concentrated water discharge pipe 75. Concentrated water discharge holes (T1, T2, T3, T4) are formed.

More specifically, the concentrated water supply hole P is formed at the center of the first block 731.

The chamber connection holes A1 and B1 may include a first chamber connection hole A1 and a second chamber connection hole B1 formed at both sides of the concentrated water supply hole P, respectively, for each power recovery chamber 71; In communication with the brine pots 72a and 72b of 71a and 71b.

At this time, the first embodiment of the present invention is shown that two power recovery chambers (71; 71a, 71b) are connected, but the chamber connection holes (A1, B1) are formed in more than that and the power recovery chambers (71; 71a, 71b) ) May be two or more connected to each chamber connecting hole (A1, B1).

In addition, the concentrated water discharge holes (T1, T2, T3, T4) are the first, second, third, fourth, concentrated water discharge holes (T1, T2, T3) formed above and below the concentrated water supply hole (P). , T4), and each concentrated water supply hole (P) is connected to the chamber connection holes (A1, B1) through a gear-type rotary valve (733).

The second block 732 closes one side of the first block 731, and a predetermined space portion 732a is formed and is positively bearing with the first block 731 by the pressure of the discharge concentration water.

In addition, the gear valve 733 is provided in the space portion 732a of the second block 732 to selectively control the inflow and discharge of the concentrated water into each of the power recovery chambers 71; 71a and 71b through rotation. In the first embodiment of the present invention, the gear valve 733 is composed of elliptical first and second external gears 733a and 733b.

In addition, a rotation shaft 733c is formed at both centers of both surfaces of the external gears 733a and 733b, one side of the rotation shaft 733c is inserted through the second block 732 and the other side penetrates the first block 731. Is inserted. At this time, the concentrated water flow path groove 734 is formed around the rotating shaft 733c so that the concentrated water can be accommodated.

On the other hand, the gear-type rotary valve block 73 is controlled by the rotary valve control means 74, the rotary valve control means 74 includes a branch line 741 and the hydraulic actuator 742.

Branch line 741 is branched from the concentrated water supply pipe 61 to transfer the high pressure concentrated water, the hydraulic actuator 742 is a gear type connected to the drive shaft 743 by the hydraulic power supplied through the branch line 741 In order to drive the valve 733, it is connected to the geared valve 733 through one side of the second block 732.

That is, since the first external gear 733a is connected to the hydraulic actuator 742, the rotation of the hydraulic actuator 742 selectively interrupts the inflow or discharge of the concentrated water into each chamber. At this time, in the first embodiment of the present invention, although the rotation shaft 733c of the first external gear 733a is connected to the drive shaft 743 of the hydraulic actuator 742, the second external gear 733b is provided through another modified embodiment. The rotating shaft of the hydraulic actuator 742 may be connected to the drive shaft 743.

Here, one side of the hydraulic actuator 742 may be further provided with a proportional control valve or a servo valve for controlling the rotation of the gear-type valve 733 by adjusting the rotational speed of the hydraulic actuator 742.

In addition, a rotation angle measurement sensor for precisely closed loop control may be further provided, and a direction change valve may be further provided.

Accordingly, the hydraulic actuator 742 can variably control the rotational speed and position of the geared valve 733 step by step and can change direction.

Referring to Figure 2 to 5 will be described the operation of the gear-type rotary valve according to the first embodiment of the present invention.

First, when the concentrated water of high pressure is supplied through the branch line 741, the hydraulic actuator 742 is driven to rotate the first external gear 733a, and the second external gear in conjunction with the rotation of the first external gear 733a. 733b rotates.

Accordingly, as shown in FIG. 6, the first chamber connecting hole A1 and the concentrated water supply hole P are formed through the concentrated water flow path groove 734 of the first external gear 733a to concentrate the high pressure. Water flows into the first power recovery chamber 71a through the first chamber connection hole A1.

Therefore, as shown in FIG. 7, the piston 711a inside the first power recovery chamber 71a moves in the "A" direction, so that the seawater in the first power recovery chamber 71a is compressed at a high pressure to obtain a high pressure seawater discharge tube ( 51).

The second chamber connecting hole A2 and the second and fourth concentrated water discharge holes T1, T2, T3, and T4 are formed through the concentrated water flow path groove 734 of the second external gear 733b. As a result, the low pressure seawater is introduced into the second power recovery chamber 71b and the piston moves in the direction "B" so that the low pressure concentrated water is discharged through the second and fourth concentrated water discharge holes T1, T2, T3, and T4. Discharged.

Subsequently, when the first external gear 733a is rotated by the stepwise driving of the hydraulic actuator 742, the second chamber connecting hole B1 and the concentrated water supply hole P are rotated as shown in FIG. 8. A flow path is formed through the concentrated water flow path groove 734 of the gear 733b so that the high pressure concentrated water flows into the second power recovery chamber 71b through the second chamber connection hole B1.

Accordingly, as shown in FIG. 9, the piston 711b inside the second power recovery chamber 71b moves in the direction of "A" so that the seawater in the second power recovery chamber 71b is compressed at a high pressure to obtain a high pressure seawater discharge tube ( 51).

The first chamber connecting hole A1 and the first and third concentrated water discharge holes T1, T2, T3, and T4 are formed through the concentrated water flow path groove 734 of the first external gear 733a. Accordingly, the low pressure seawater is introduced into the first power recovery chamber 71a and the piston 711a moves in the "B" direction so that the low pressure concentrated water is discharged from the first and third concentrated water discharge holes T1, T2, T3, and T4. Is discharged through).

Thus, the first embodiment of the present invention by rotating the gear-type valve step by step through the hydraulic actuator drive using the high pressure of the separate concentrated water to selectively control the supply and discharge of the concentrated water to each power recovery chamber, the electric motor Since there is no use, there is an advantage that can reduce power consumption.

FIG. 10 is an exploded perspective view of a gear type rotary valve block according to a second embodiment of the present invention, and FIG. 11 is an exploded perspective view of the gear type rotary valve block according to a second embodiment of the present invention. FIG. 12 is a front view as illustrated except for the second block of FIG. 11.

10 to 12, the gear-type rotary valve block is an elliptical first block 731 and a second block 732 and a gear which are hydrostatically bearing by supply water pressure to one side of the first block 731. A valve 733.

Here, the other side of the first block 731 is formed with a dumbbell-shaped concentrated water groove 735, the main concentrated water supply hole (Pm) is formed in the center of the concentrated water groove 735, the main concentrated water supply On both sides of the ball Pm, a plurality of sub-concentrated water supply holes Ps are disposed, each radially formed.

In addition, chamber connection holes A1 to A9 and B1 to B9 communicating with the plurality of power recovery chambers are formed in both sides of the concentrated water groove 735 of the first block 731 in a radial shape.

Further, concentrated water supply holes T1 and T2 are formed in the upper and lower portions of the center of the concentrated water groove 735 of the first block 731.

The second block 732 closes one side of the first block 731, and a predetermined space portion 732a is formed and is positively bearing with the first block 731 by the pressure of the supply water.

In addition, the gear valve 733 is provided in the space portion 732a of the second block 732 to selectively control the inflow and discharge of the concentrated water into each of the power recovery chambers 71; 71a and 71b through rotation. And circular first and second external gears 733b.

In addition, a rotation shaft 733c is formed at both centers of both surfaces of the circular external gears 733a and 733b. One side of the rotation shaft 733c is inserted into the second block 732 and the other side is inserted into the first block 731. It is inserted through. At this time, the concentrated water flow path groove 734 is formed around the rotating shaft 733c so that the concentrated water can be accommodated.

Referring to the operation of the gear-type rotary valve block according to the second embodiment of the present invention as follows. In this case, the operation of the power recovery chamber of FIGS. 7 and 9 is described above with reference to FIGS. 7 and 9. In the second embodiment of the present invention, the first power recovery chamber corresponds to the power recovery chamber of A1 to A9 and the second power recovery chamber. The chamber corresponds to the power recovery chamber of the B1 ~ B9 chamber will be described with reference to this.

First, when the concentrated water of high pressure is supplied through the branch line 741, the hydraulic actuator 742 is driven to rotate the first external gear 733a, and the second external gear in conjunction with the rotation of the first external gear 733a. 733b rotates.

Accordingly, as shown in FIG. 12, the concentrated water flow path grooves 734 of the first and second external gears 733b are disposed between the A1 to A9 chamber connection holes A1 to A9 and the concentrated water supply hole P. As shown in FIG. The flow path is formed through the high pressure concentrated water flows into the plurality of first power recovery chambers 71a through the A1-A9 chamber connecting holes A1-A9.

Therefore, as illustrated in FIG. 7, the pistons 711a in the plurality of first power recovery chambers 71a move in the direction of "A", and the seawater in the first power recovery chambers 71a is compressed at a high pressure to discharge high pressure seawater. It is discharged to the tube 51.

As the flow path is formed between the B1 to B9 chamber connecting holes B1 to B9 and the concentrated water discharge holes T1, T2, T3, and T4 through a space portion outside each circular external gear, the low pressure seawater is the second power source. The inside of the recovery chamber 71b and the piston 711b move in the "B" direction to discharge the low pressure concentrated water through the concentrated water supply holes T1 and T2.

Subsequently, when the first external gear 733a is rotated by the stepwise driving of the hydraulic actuator 742, as shown in FIG. 13, between the B1 to B9 chamber connecting holes B1 to B9 and the concentrated water supply hole P, as shown in FIG. 13. A flow path is formed through the concentrated water flow path grooves 734 of the first and second external gears 733b so that the high pressure concentrated water passes through the B1 to B9 chamber connecting holes B1 to B9 to the second power recovery chamber 71b. Inflow.

Accordingly, as shown in FIG. 9, the piston 711b inside the second power recovery chamber 71b moves in the direction of "A" so that the seawater in the second power recovery chamber 71b is compressed at a high pressure to obtain a high pressure seawater discharge tube ( 51).

In addition, as the flow path is formed between the A1 to A9 chamber connecting holes A1 to A9 and the concentrated water supply holes T1 and T2 through a space portion outside the circular external gear, the low pressure seawater is the first power recovery chamber 71a. ) And the piston moves in the "B" direction, and the low pressure concentrated water is discharged through the brine discharge holes T1 and T2.

In the embodiments of the present invention, a pair of elliptical or circular external gears are exemplified as geared valves, but other modified embodiments may use an internal gear valve or a rotor valve, and in this case, to suit each valve shape. It is preferable to form a brine feed hole, a brine drain hole and a chamber connection hole.

1 is a block diagram showing a seawater desalination system having an energy recovery apparatus according to the prior art.

2 is a block diagram of an energy recovery apparatus according to a first embodiment of the present invention.

3 is a perspective view of the gear type rotary valve block of FIG.

4 is a front exploded perspective view of FIG.

5 is a rear exploded perspective view of FIG. 3;

6 to 9 are explanatory views of the operation of the energy recovery device according to the first embodiment of the present invention.

 10 is an exploded perspective view of a side of a gear-type rotary valve block according to a second embodiment of the present invention.

11 is another exploded perspective view showing a gear-type rotary valve block according to a second embodiment of the present invention.

FIG. 12 is a front view as seen from the second block of FIG. 11;

<Description of the symbols for the main parts of the drawings>

1: raw water storage tank 2: pretreatment unit

3: supply water tank

4: low pressure pump 41: low pressure sea water supply pipe

5: high pressure pump 51: high pressure seawater discharge pipe

6: membrane 61: concentrated water supply pipe

7: energy recovery device

71: power recovery chamber, 71a: first power recovery chamber, 71b: second power recovery chamber

711: piston, 711a: first piston, 711b: second piston

72a, 72b: concentrated water port, 72c, 72d: seawater port

73: gear type rotary valve block

731: the first block

732: second block

733: gear valve

733a: First external gear

733b: Second external gear

734: Concentrated Water Eurohome

735: concentrate home

74: rotary valve control means

741: Branch Line

742: Hydraulic Actuator

743: axis of rotation

75: concentrated water discharge pipe

76: check valve

76a: 1st check valve, 74b: 2nd check valve, 74c: 3rd check valve

74d: fourth check valve

8: booster pump

Claims (9)

It includes a plurality of power recovery chambers having a piston therein, a high pressure concentrated water supply pipe, a low pressure concentrated water discharge pipe, and a high pressure seawater discharge pipe. In the energy recovery device of the seawater desalination device to recover the hydraulic power of the high-pressure concentrated water to be used to drive the seawater supply pump, A gear-type rotary valve block provided between the brine supply pipe and the brine discharge pipe to selectively control the brine supply to each of the power recovery chambers; Pressure energy recovery device driven by a gear-type rotary valve, characterized in that it comprises a rotary valve control means for controlling the gear-type rotary valve block. The method of claim 1, The gear type rotary valve block; A first block having a concentrated water supply hole communicating with the high pressure concentrated water supply pipe, a chamber connection hole communicating with each of the power recovery chambers, and a concentrated water discharge hole communicating with the low pressure concentrated water discharge pipe; A second block which closes one side of the first block and has a predetermined space portion and is hydrostatically bearing by the supply water pressure to the first block; Pressure energy recovery driven by the gear-type rotary valve characterized in that it comprises a gear-type valve for selectively intermitting the inlet and outlet of the concentrated water to the power recovery chamber through the rotation provided in the space portion of the second block Device. 3. The method of claim 2, The gear valve is a pressure energy recovery device driven by a gear-type rotary valve, characterized in that any one selected from a pair of external gear valve, or an internal gear valve, or a rotor valve. The method of claim 3, The rotary valve control means; Branch line branched from the concentrated water supply pipe, Pressure energy recovery driven by the gear type rotary valve, characterized in that consisting of a hydraulic actuator which is connected to the gear type valve through one side of the second block to drive the gear type valve with the hydraulic power supplied through the branch line Device. The method of claim 4, wherein One side of the hydraulic actuator is a pressure energy recovery device driven by a gear-type rotary valve, characterized in that provided with a proportional control valve or a servo valve for controlling the rotation of the gear-type valve. The method of claim 5, One side of the hydraulic actuator pressure energy recovery device driven by a gear-type rotary valve, characterized in that the rotation angle measuring sensor is further provided. The method of claim 6, One side of the hydraulic actuator pressure energy recovery device driven by a gear-type rotary valve, characterized in that further provided with a direction switching valve. The method according to any one of claims 1 to 7, Pressure energy recovery device driven by a gear-type rotary valve, characterized in that the elliptical or circular piston is provided in each of the power recovery chamber. The method of claim 4, wherein The low pressure seawater supply pipe is a pressure energy recovery device driven by a gear-type rotary valve, characterized in that a plurality of check valves for intermittent flow direction of the fluid is provided.

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