CN201836155U - Electro-hydraulic liquid reversing energy recovery unit - Google Patents

Abstract

The utility model provides an electro-hydraulic liquid reversing energy recovery unit which is simple to control, has small pressure fluctuation, and comprises an electro-hydraulic liquid reversing valve, two pressure exchange tubes and four one-way check valves; a free piston is arranged in each pressure exchange tube, the pressure exchange tube is divided into two working chambers, respectively a working chamber of liquid to be conveyed and a waste liquid working chamber; the electro-hydraulic liquid reversing energy recovery unit has the beneficial effects that because the electro-hydraulic liquid reversing valve is piloted and controlled by an electromagnetic pilot valve and a main valve is pushed by high-pressure waste liquid on the operation control system pipeline of the electromagnetic pilot valve, the thrust is very large, the operation is also very convenient, the reversing is quite stable and quick, and the electro-hydraulic liquid reversing energy recovery unit is quite applicable to high-pressure and high-flow reverse osmosis desalination systems.

Description

A kind of electric liquid commutation energy recovering device

Technical field

The utility model relates to a kind ofly can be delivered to the pressure exchanger of one other fluid from a kind of fluid with pressure, refers in particular to the electric liquid commutation energy recovering device that is used for reverse osmosis seawater desalination system.

Background technique

Reverse osmosis technology belongs to pressure-actuated membrane separation technique, and the semipermeable membrane that adopts in its process operation is organically kept apart fresh water and concentrated seawater, under the effect of high pressure the fresh water in seawater or the brackish water is carried out separating process.The fresh water that is separated flows out with the form of penetrants, and remaining seawater that is concentrated or brackish water are discharged with the form of brine.Operation pressure is generally between 5.0～6.8MPa in China's reverse osmosis seawater desalting engineering, and the pressure of the concentrated seawater that discharges from film group device is still up to 4.8～6.6MPa.If the water recovery rate according to common 40% is calculated, 60% feed pressure energy is arranged in the concentrated seawater approximately, have huge recovery value and meaning.

Energy recycle device based on reverse osmosis seawater desalination system mainly contains water turbine type, differential pressure exchange type and isobaric exchange type at present.Comparatively complicated moving element is all adopted in these three kinds of designs, the agent structure of its energy interchange.In addition, water turbine type energy recycle device efficient is on the low side, and general energy recovery efficiency is between 40%～70%; It is less than normal that differential pressure exchange type energy recycle device is handled energy, is not suitable for large scale system; Isobaric exchange type energy recycle device efficient has become the emphasis of domestic and international research and extension at present up to more than 94%.

Chinese patent ZL98809685.4 has announced a kind of pressure exchanger, this pressure exchanger is subjected to the restriction of the volume of the rotating speed of rotor and rotor channel, the treating capacity of separate unit PX is less, next adopts rotor channel that the entity piston is not set to carry out mixing of insulating sea water and concentrated seawater, mixing section has been sacrificed the volume of rotor channel about 50%, high pressure sea water salinity after the supercharging simultaneously increases, and then improves the operation pressure of system; Can influence rotor speed during last changes in flow rate, cause system's fluctuation of service, and a large amount of noise severe contaminations that send in the rotor operation process surrounding enviroment.

Two pressurized container merit exchange energy recovers (DWEER) of Switzerland CALDER AG company, its LinX valve of carrying out the concentrated seawater guiding adopts the oil pressure guide to drive, and not only will dispose an independently pressurized oil system for this reason, and leakage of oil easily, pollution of marine environment.

Chinese patent ZL01130627.0 has announced a kind of valve controlled residual pressure recovering equipment for impervious desalination system.This device adopts 4 three-way solenoid valves to switch high-pressure thick water and the commutation of low pressure seawater, because the three-way solenoid valve switch speed is slow, needs 2 covering device alternations in parallel could satisfy the requirement of counter-infiltration system to pressure and flowed fluctuation at least; Simultaneously since under the desalination of sea water operating mode high and low pressure side pressure reduction very big, to have at first enough that the Electrical heads of big moment could drive three-way solenoid valve, secondly three-way solenoid valve will overcome the high and low pressure side unbalanced force and realizes steady in a long-term the operation, this is at present or a difficult problem; This device needs the valve control system of more complicated, can not form mechanical interlocked reliably between the switching moment three-way solenoid valve each other, the high pressure relief phenomenon very easily occurs, and then cause counter-infiltration system pressure and flow big fluctuation to occur, practical application is restricted.

Summary of the invention

The purpose of this utility model provides a kind of electric liquid commutation energy recovering device, and control is simple, and pressure surge is little.For this reason, the utility model by the following technical solutions: it comprises electro-hydraulic reversing valve, two pressure-exchange pipes and four one way stop peturn valves;

The every built-in free-piston of pressure-exchange pipe, and the pressure-exchange pipe is divided into two active chambers, be respectively to be transferred liquid active chamber and discarded liquid active chamber;

Described four one way stop peturn valves are split two groups, one of every group of one-way valve carry and be transferred liquid and prevent the adverse current one-way valve to being transferred the liquid active chamber for being used for, another extrudes and prevents the adverse current one-way valve for high pressure is transferred liquid from carry the liquid active chamber, every group of one-way valve links to each other with the liquid active chamber that is transferred of a pressure-exchange pipe respectively, and direction is that the outlet of two one way stop peturn valves of extruder pressure exchange pipe links to each other by pipeline in the described one way stop peturn valve; Direction is that the import that is pressed into two one way stop peturn valves of pressure-exchange pipe links to each other by pipeline in the described one way stop peturn valve;

Described electro-hydraulic reversing valve is made of the electromagnetic priority valve of a 3-position 4-way and the main valve of a 3-position 4-way;

Pilot valve is provided with valve rod and supplies the valve pocket of valve rod axial motion, and described valve pocket has P ₁Port, K ₁₀Port, K ₂₀Port, O ₁Port, P ₁Port is the discarded liquid import of high pressure, O ₁Port is discarded liquid floss hole; The two ends of the valve rod of pilot valve are respectively equipped with Returnning spring;

Described pilot valve is provided with the electromagnet of actuate valve stem axial motion and the control mechanism of electromagnet;

P ₁Port, K ₁₀Port, K ₂₀Port, O ₁₀The position of port and pilot valve valve rod have following matching relationship: the pilot valve valve rod has middle working position between first working position, second working position, first working position and second working position along its motion path; When first working position, P ₁Port and K ₁₀Port is connected, O ₁Port and K ₂₀Port is connected, when second working position, and P ₁Port and K ₂₀Port is connected, O ₁Port and K ₁₀Port is connected, when middle working position, and O ₁Port and K ₁₀Port, K ₂₀Port is connected;

Main valve is provided with valve rod and supplies the valve pocket of valve rod axial motion, and described valve pocket has P ₂Port, A port, B port, O ₂Port, the discarded liquid active chamber of described two pressure-exchange pipes are connected P with A port, B port respectively ₂Port is the discarded liquid import of high pressure, O ₂Port is discarded liquid floss hole; The two ends of described main valve are provided with the valve rod actuator chamber, and the valve rod actuator chamber at described two ends is respectively equipped with control mouthful, described control mouth respectively with the K of pilot valve ₁₀Port, K ₂Control mouthful connection; The two ends of the valve rod of main valve are respectively equipped with Returnning spring;

P ₂Port, A port, B port, O ₂The position of port and main valve valve rod have following matching relationship: the main valve valve rod has middle working position between first working position, second working position, first working position and second working position along its motion path; When first working position, P ₂Port and A port are connected, O ₂Port and B port are connected, when second working position, and P ₂Port and B port are connected, O ₂Port and A port are connected, when middle working position, and P ₂Port and A port, B port are connected.

Owing to adopt the technical solution of the utility model, the utlity model has following beneficial effect:

1. because electro-hydraulic reversing valve adopts electromagnetic priority valve guide control, main valve is to promote by the discarded liquid of the high pressure on the electromagnetic priority valve operation control system pipeline, therefore thrust can be very big, operate also very convenient, commutation is more suitable for the impervious desalination system of high pressure, big flow relatively steadily fast.

2. because electro-hydraulic reversing valve adopts the 3-position 4-way valve arrangement, no matter be to switch to second work, still switch to second work, switch moment all to pass through meta from first working position from first working position, this moment P ₂Port and A port, B port are all connected, can make continuous input of the discarded liquid of high pressure and high pressure be transferred liquid so on the one hand exports continuously, guarantee the pressure of impervious desalination system and the stationarity of flow, can reduce two pressure-exchange plumbers on the other hand and make to switch the water hammer of moment.

3. owing to adopt electro-hydraulic reversing valve as discarded liquid pilot valve, can form mechanical interlockedly reliably, valve switches moment the phenomenon of " high and low pressure liquid crossfire " can not take place.

Since the pressure-exchange pipe be transferred the liquid active chamber and be provided with 4 one way stop peturn valves by rule, can be according to pressure-exchange pipe internal pressure situation automatic on-off, not only can the simplification device control system, and be not easy to break down.

5. move through long in demonstration project, device operates steadily, and noise is low, and energy recovery efficiency has high value of practical up to more than 95%, has produced certain economic benefits and social benefit.

Description of drawings

The system schematic that Fig. 1 uses in impervious desalination system for the utility model.

Fig. 2 is the structure sectional view of electro-hydraulic reversing valve of the present utility model.

Embodiment

With reference to accompanying drawing.The utility model comprises electro-hydraulic reversing valve, 11,12 and four one way stop peturn valves 21,22,23,24 of two pressure-exchange pipes;

Being provided with free-piston 110 in the pressure-exchange pipe 11, and being divided into two active chambers, is respectively to be transferred liquid active chamber 111 and discarded liquid active chamber 112; Being provided with free-piston 120 in the pressure-exchange pipe 12, and being divided into two active chambers, is respectively to be transferred liquid active chamber 121 and discarded liquid active chamber 122;

Described four one way stop peturn valves are split two groups, one way stop peturn valve 21,22 is one group and is communicated with the liquid active chamber 111 that is transferred of pressure-exchange pipe 11, the direction of one way stop peturn valve 21 and one way stop peturn valve 22 is opposite, one way stop peturn valve 23,24 is one group and is communicated with the liquid active chamber 121 that is transferred of pressure-exchange pipe 12, the direction of one way stop peturn valve 23 and one way stop peturn valve 24 is opposite, and one way stop peturn valve 22 links to each other by pipeline 206 with 24.

Described electro-hydraulic reversing valve is made of the electromagnetic priority valve 3 of a 3-position 4-way and the main valve 4 of a 3-position 4-way;

Pilot valve 3 is provided with valve rod 31 and supplies the valve pocket 32 of valve rod 31 axial motions, and described valve pocket has P ₁Port, K ₁₀Port, K ₂₀Port, O ₁Port, O ₁Port is two imports about the valve pocket place has, and on valve pocket 32, are followed successively by O vertically ₁Port left side import, K ₁₀Port, P ₁Port, K ₂₀Port, O ₁The import of port right side; P ₁Port is the discarded liquid import of high pressure, O ₁Port is discarded liquid floss hole; The two ends of the valve rod of pilot valve are respectively equipped with Returnning spring 33;

Described pilot valve is provided with electromagnet 1YA, the 2YA of actuate valve stem 31 axial motions and the control mechanism of electromagnet at two ends, make electromagnet 1YA, 2YA under the control of control mechanism, move by certain time sequence, make valve rod 31 by electromagnet 1YA, the 2YA promotion that circulates, circulation is in middle working position, second working position between first working position, first working position and second working position.

When first working position, P ₁Port and K ₁₀Port is connected, O ₁Port and K ₂₀Port is connected, when second working position, and P ₁Port and K ₂₀Port is connected, O ₁Port and K ₁₀Port is connected, when middle working position, and O ₁Port and K ₁₀Port, K ₂₀Port is connected;

Main valve 4 is provided with valve rod 41 and supplies the valve pocket 42 of valve rod axial motion, and described valve pocket has P ₂Port, A port, B port, O ₂Port, O ₂Port is two imports about the valve pocket place has, and on valve pocket 42, are followed successively by O vertically ₂Port left side import, B port, P ₂Port, A port, O ₂The import of port right side; The discarded liquid active chamber 112 of pressure-exchange pipe 11 and B port are communicated with, and the discarded liquid active chamber 122 of pressure-exchange pipe 12 and A port are communicated with, P ₂Port is the discarded liquid import of high pressure, O ₂Port is discarded liquid floss hole, and the two ends of described main valve are provided with valve rod actuator chamber Q ₁, Q ₂, the valve rod actuator chamber Q at described two ends ₁, Q ₂Be respectively equipped with K ₁Control mouth, K ₂The control mouth, K ₁The K of control mouth and pilot valve ₁₀Port is connected, K ₂The K of control mouth and pilot valve ₂₀Port is connected; The two ends of the valve rod of main valve are respectively equipped with Returnning spring 43;

In the different operating position, the valve rod of main valve correspondingly is in the different operating position under its control according to electromagnetic priority valve; The circulation of main valve valve rod is in middle working position, second working position between first working position, first working position and second working position.When first working position, P ₂Port and A port are connected, O ₂Port and B port are connected, when second working position, and P ₂Port and B port are connected, O ₂Port and A port are connected, when middle working position, and P ₂Port and A port, B port are connected.

Described electric liquid commutation energy recovering device can adopt the use in parallel of many covers.

In Fig. 1, label 201 is the film group device in the counter-infiltration system, and label 202 is the sea water preprocessing device in the counter-infiltration system, label Be pressure gauge, label

Be flowmeter, label 203 is the high-pressure service pump in the counter-infiltration system, and label 204 is the suction booster in the counter-infiltration system, and label 205 is the boost in pressure pump in the counter-infiltration system.One way stop peturn valve 21,23 is respectively the water inlet one way stop peturn valve that is transferred the liquid active chamber of pressure- exchange pipe 11,12, one way stop peturn valve 22,24 is respectively the water outlet one way stop peturn valve that is transferred the liquid active chamber of pressure- exchange pipe 11,12, one way stop peturn valve 22,24 is connected with boost in pressure pump 205 after linking to each other by pipeline 206, enter the entrance point of film group device 201 then, the P of discarded liquid outlet of the high pressure of film group device 201 and electromagnetic priority valve ₁The P of port and main valve ₂Port is connected.

Described electro-hydraulic reversing valve is the unique ACTIVE CONTROL valve of described energy recycle device, and the dead electricity that gets by the control electromagnet makes described energy recycle device enter following corresponding work state:

1, electromagnet 1YA dead electricity, 2YA gets when electric

The loop is inserted in the right position of electromagnetic priority valve 3, promptly its valve rod 31 by the electromagnet pushing shaft to moving to second working position, P ₁Port and K ₂₀Port is connected, O ₁Port and K ₁₀Port is connected, and the discarded liquid of high pressure is through P ₁Port and K ₂₀Port is connected the K that flows into main valve ₂Port drives main valve stem and moves to left to being in second working position, and loop, the P of main valve are inserted in the right position of main valve ₂Port and B port are connected, O ₂Port and A port are connected.At this moment, the discarded liquid of high pressure enters pressure-exchange pipe 11 discarded liquid active chambers 112, one way stop peturn valve 21 is closed automatically, one way stop peturn valve 22 is opened automatically, and the liquid that is transferred that pressure-exchange pipe 11 is transferred liquid active chamber 111 is pressurized to high pressure is transferred liquid under the discarded promotion of liquid by free-piston 110 of high pressure and exports; Simultaneously, one way stop peturn valve 24 is transferred at described high pressure under the effect of liquid and closes automatically, one way stop peturn valve 23 is transferred in low pressure under the pressure-driven of liquid and opens automatically, low pressure is transferred liquid and enters pressure-exchange pipe 12 and be transferred liquid active chamber 121, and by free-piston 120 promote in the pressure-exchange pipes 12 discarded liquid active chambers 122 by the discarded liquid behind the exchange pressure through primary valve O ₂Outwards discharging.

When main valve valve rod 41 moves, main valve actuator chamber Q ₁Interior liquid is according to K ₁Control mouth, K ₁₀Control mouth, O ₁Outwards discharge in the path of port.

2, described electromagnet 1YA, 2YA are during dead electricity

Electromagnetic priority valve 3 metas insert the loop, i.e. its valve rod 31 working position that mediates automatically under the effect of spring force, O ₁Port and K ₁₀Port, K ₂₀Port is connected, the Q of main valve ₁Actuator chamber and Q ₂The outside zero-pressure discharging of liquid in the actuator chamber, the valve rod 41 of the main valve working position that under the spring force effect, mediates automatically, P ₂Port and A port, B port are connected.At this moment, the discarded liquid of high pressure enters pressure-exchange pipe 11 discarded liquid active chambers 112 and pressure-exchange pipe 12 discarded liquid active chambers 122 simultaneously, one way stop peturn valve 21, one way stop peturn valve 23 are closed automatically, one way stop peturn valve 22, one way stop peturn valve 24 are opened automatically, and the liquid that is transferred that is transferred liquid active chamber 121 that is transferred liquid active chamber 111 and pressure-exchange pipe 12 of pressure-exchange pipe 11 is pressurized to high pressure is transferred liquid under the discarded promotion of liquid by free-piston 110, free-piston 120 of high pressure and exports.

3, electromagnet 1YA get electric, during the 2YA dead electricity

The loop is inserted in position, electromagnetic priority valve 3 left side, and promptly its valve rod 31 is attracted axial motion to the first working position, P ₁Port and K ₁₀Port is connected, O ₁Port and K ₂₀Port is connected, and the discarded liquid of high pressure is through P ₁Port and K ₁₀Port is connected the K that flows into main valve ₁Port drives main valve stem and moves to right to being in first working position, and loop, the P of main valve are inserted in the position, a left side of main valve ₂Port and A port are connected, O ₂Port and B port are connected.At this moment, the discarded liquid of high pressure enters pressure-exchange pipe 12 discarded liquid active chambers 122, one way stop peturn valve 23 is closed automatically, one way stop peturn valve 24 is opened automatically, and the liquid that is transferred that pressure-exchange pipe 12 is transferred liquid active chamber 121 is pressurized to high pressure is transferred liquid under the discarded promotion of liquid by free-piston 120 of high pressure and exports; Simultaneously, one way stop peturn valve 22 is transferred at described high pressure under the effect of liquid and closes automatically, one way stop peturn valve 21 is transferred in low pressure under the pressure-driven of liquid and opens automatically, low pressure is transferred liquid and enters pressure-exchange pipe 11 and be transferred liquid active chamber 111, and by free-piston 110 promote in the pressure-exchange pipes 11 discarded liquid active chambers 112 by the discarded liquid behind the exchange pressure through primary valve O ₂Outwards discharging.

When main valve valve rod 41 moves, main valve actuator chamber Q ₂Interior liquid is according to K ₂Control mouth, K ₂₀Control mouth, O ₁Outwards discharge in the path of port.

Described electric liquid commutation energy recovering device, calculate above-mentioned switching time according to flow system flow, determine the systemic circulation frequency, described control gear by solenoid directional control valve is carried out time-oriented sequential control, electromagnet 1YA and 2YA are moved according to sequential, make electro-hydraulic reversing valve by " meta → left side position → meta → right side position → meta → left side position → ... " switching rule do action, finish discarded liquid overbottom pressure energy recovery and utilize again.

Embodiment described above is with daily output fresh water 1000m ³/ d, the reverse osmosis seawater desalting engineering of the water recovery rate 40% is an example, does further statement below in conjunction with accompanying drawing 1 to the utility model:

With described electric liquid commutation energy recovering device is energy recycle device, and the about 60～65m of flow is handled in load ³/ h, the device cycle frequency is 2 times/min.

Starting drive according to the following steps during work: start electric liquid commutation energy recovering device, then open suction booster 204, boost in pressure pump 205 successively, through behind 1～3 minute low pressure exhaust, start high-pressure service pump 203, equipment enters normal operating condition.Working procedure afterwards is as follows:

Enter pre-treater 202 after 204 superchargings of charging seawater process suction booster, the seawater that the process pretreatment is come out is divided into two tunnel, one road seawater (about 40%) and directly boosts to desalination of sea water nominal operation pressure by high-pressure service pump 203; What another road seawater (about 60%) was transferred promptly also that liquid enters electric liquid commutation energy recovering device is transferred the liquid active chamber, after electric liquid commutation energy recovering device carries out pressure-exchange, be pressurized to desalination of sea water nominal operation pressure through boost in pressure pump 205 again, converge the common charging in back as film group device with last road high pressure sea water.The on high-tension side high-pressure thick seawater of film group device also is the discarded liquid active chamber that the discarded liquid of high pressure enters electric liquid commutation energy recovering device pressure-exchange pipe, also promptly is transferred hydraulic coupling exchange back discharge system with the low pressure seawater; The fresh water that sees through film group device is supplied with user's use.The pressure-exchange process circulates as previously mentioned and carries out.

Table 1 has provided 1000m ³Energy recycle device electro-hydraulic reversing valve actuation cycle table in the/d reverse osmosis seawater desalting engineering.During normal the operation, the described control gear of solenoid directional control valve also is that PLC controls electromagnet automatically from " state A → state B ₁→ state C → state B ₂→ get back to state A, continue circulation ... ".Main valve P when electro-hydraulic reversing valve is in state B ₂Port and A port, B port are connected, and this state duration generally should be controlled at below the 1s.

Table 1: electro-hydraulic reversing valve actuation cycle table

With reference to Fig. 1 and table 2, table 2 has provided 1000m ³/ d reverse osmosis seawater desalination system is presented at the flow rate pressure balance sheet of the each point among Fig. 1 after using described energy recycle device, the concentrated seawater flow that the flow by the boost in pressure pump equals to give off from film group device deducts a small amount of control water of electro-hydraulic reversing valve; Flow by high-pressure service pump equals a small amount of control water sum that system produces water flow and electro-hydraulic reversing valve.

Table 2: system's each point flow rate pressure balance sheet

Produce fresh water 1000m daily with Fig. 1 ³/ d, the reverse osmosis seawater desalting engineering of the water recovery rate 40% is an example, at 25 ℃, is 35000mg/L to water concentration, under the pH=7 condition, under noenergy recovering device situation, the system ontology energy consumption is 6.4kWh/m ³, the system ontology energy consumption is 2.4kWh/m after using the utility model energy recycle device ³Example, expectation can save energy consumption and expense is as follows:

But with ton water using electricity wisely: 4.0kWh/m ³Electricity price: 0.8 yuan/kWh; The utilization of capacity: 80%, then annual economize on electricity overall cost is:

ξ=1000 * 365 * 0.8 * 4.0 * 0.8/10000=93.44 (ten thousand yuan/year)

With 1000m ³The sea water desalinating unit of/d is an example, and the system high pressure pump duty with energy recycle device does not need 105m ³/ h, and the system high pressure pump duty of band the utility model energy recycle device only needs 42m ³Therefore/h adopts energy recycle device can significantly reduce the investment of desalination of sea water high-pressure service pump, and business efficiency is fairly obvious.

At last, it is also to be noted that, more than only be examples of implementation of the present utility model.Obviously the utility model is not limited to above example, and a lot of distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection domain of the present utility model.

Claims (2)

1. an electric liquid commutation energy recovering device is characterized in that it comprises electro-hydraulic reversing valve, two pressure-exchange pipes and four one way stop peturn valves;

The every built-in free-piston of pressure-exchange pipe, and the pressure-exchange pipe is divided into two active chambers, be respectively to be transferred liquid active chamber and discarded liquid active chamber;

Described four one way stop peturn valves are split two groups, one of every group of one-way valve carry and be transferred liquid and prevent the adverse current one-way valve to being transferred the liquid active chamber for being used for, another extrudes from carry the liquid active chamber and prevents the adverse current one-way valve for high pressure is transferred liquid, and every group of one-way valve links to each other with the liquid active chamber that is transferred of a pressure-exchange pipe respectively;

Direction is that the outlet of two one way stop peturn valves of extruder pressure exchange pipe links to each other by pipeline in the described one way stop peturn valve; Direction is that the import that is pressed into two one way stop peturn valves of pressure-exchange pipe links to each other by pipeline in the described one way stop peturn valve;

Described electro-hydraulic reversing valve is made of the electromagnetic priority valve of a 3-position 4-way and the main valve of a 3-position 4-way;

Pilot valve is provided with valve rod and supplies the valve pocket of valve rod axial motion, and described valve pocket has P ₁Port, K ₁₀Port, K ₂₀Port, O ₁Port, P ₁Port is the discarded liquid import of high pressure, O ₁Port is discarded liquid floss hole; The two ends of the valve rod of pilot valve are respectively equipped with Returnning spring;

Described pilot valve is provided with the electromagnet of actuate valve stem axial motion and the control mechanism of electromagnet;

P ₁Port, K ₁₀Port, K ₂₀Port, O ₁The position of port and pilot valve valve rod have following matching relationship: the pilot valve valve rod has middle working position between first working position, second working position, first working position and second working position along its motion path; When first working position, P ₁Port and K ₁₀Port is connected, O ₁Port and K ₂₀Port is connected, when second working position, and P ₁Port and K ₂₀Port is connected, O ₁Port and K ₁₀Port is connected, when middle working position, and O ₁Port and K ₁₀Port, K ₂₀Port is connected;

Main valve is provided with valve rod and supplies the valve pocket of valve rod axial motion, and described valve pocket has P ₂Port, A port, B port, O ₂Port, the discarded liquid active chamber of described two pressure-exchange pipes are connected P with A port, B port respectively ₂Port is the discarded liquid import of high pressure, O ₂Port is discarded liquid floss hole; The two ends of described main valve are provided with the valve rod actuator chamber, and the valve rod actuator chamber at described two ends is respectively equipped with control mouthful, described control mouth respectively with the K of pilot valve ₁₀Port, K ₂₀Control mouthful connection; The two ends of the valve rod of main valve are respectively equipped with Returnning spring;

P ₂Port, A port, B port, O ₂The position of port and main valve valve rod have following matching relationship: the main valve valve rod has middle working position between first working position, second working position, first working position and second working position along its motion path; When first working position, P ₂Port and A port are connected, O ₂Port and B port are connected, when second working position, and P ₂Port and B port are connected, O ₂Port and A port are connected, when middle working position, and P ₂Port and A port, B port are connected.

2. a kind of electric liquid commutation energy recovering device as claimed in claim 1 is characterized in that described electric liquid commutation energy recovering device can adopt the use in parallel of many covers.

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