Please select the most similar patent number from A, B, C and D. Which number is?
An intelligent adjustable high-pressure pump station system, comprising an oil tank (1), energy accumulators (2), and oil pumps. The oil tank (1) is connected to at least two oil pumps by means of pipelines; an energy accumulator (2) is connected between every two adjacent oil pumps by means of pipelines; a one-way valve is provided on a pipeline at an oil outlet of the oil tank; and a one-way vale is separately provided on an oil inlet pipeline and an oil outlet pipeline of each energy accumulator (2). When hydraulic pumps form a pump station system, multiple oil pumps are connected in series for use, and energy accumulators are combined, so that ultrahigh pressure can be produced; the intelligent adjustable high-pressure pump station system is safe and reliable, and is stable in operation.
A: A floating turnover hydraulic power output device, comprising a buoy (1), an outer frame support (2), a base (35, 36), a power turnover mechanism (27), and a hydraulic actuator (41); the upper end and lower end of the buoy (1) are respectively provided with an upper connecting rod (5) and a lower connecting rod (6) respectively connected with the pistons (7, 8) of two hydraulic cylinders (3, 4) on the upper part and lower part of the outer frame support (2); the oil inlets and outlets of the hydraulic cylinders (3, 4) are respectively installed with one-way valves (13, 14, 15, 16); the one-way valves (13, 14, 15, 16) are respectively connected to a hydraulic oil tank (40) and a high pressure accumulator (42) via high pressure oil pipes (17, 18); the outer frame support (2) is a permeable structure; a rotary shaft (23, 24) is installed in the middle of the outer frame support (2), and is slidably connected to the outer frame support (2); and the power turnover mechanism (27) is connected to the rotary shaft (23, 24). The device can continuously and circularly rotate around the rotary shafts under a small external force, and can release the buoy during the rotation to convert buoyancy potential energy into hydraulic energy. The combined use of multiple sets of the devices can continuously force hydraulic oil into a high pressure accumulator for direct use.
B: A hydraulic system, which comprises: an accumulator (7), a hydraulic cylinder (6) including a rod cavity (62) and a rodless cavity (61), a hydraulic pump (5), an oil tank (4), a first valve assembly (1) and a second valve assembly (2). The first valve assembly comprises a first port (f) connected to the rodless cavity, a second working port (d) connected to the rod cavity, a third port (a) connected to the hydraulic pump, and a fourth working port (c) connected to the oil tank, and has a first working state in which the first working port and the third working port are connected; the second valve assembly comprises a first port (g) connected to the rodless cavity, a second working port (h) connected to the rod cavity, a third port (i) connected to the accumulator, and has a first control state in which the first working port, the second working port and the third working port are all connected, and the hydraulic system can improve the energy recovery efficiency of the accumulator.
C: An electro-hydraulic system for driving a large-scale rotary motion valve supplied by a solar low-capacity power. A step motor (2) and an oil pump (3) are in turn driven by a low-capacity solar power supply (1). An oil tank (5), the oil pump, a check valve (6), a T-connector (7) and a liquid accumulator (10) are in turn arranged on an oil storage pipeline (4). An oil inlet pipeline (16) is connected to the rest of the ports of the T-connector. An oil inlet of a three-position four-way reversing solenoid valve (12) is connected to the oil inlet pipeline. Two ends of an oil return pipeline are connected to an oil return port of the reversing valve and an oil return port of the oil tank, respectively. Each of two oil outlets of the reversing valve is respectively connected to an oil port of a single-chamber cylinder via a pipeline. The outer ends of the piston rods of cylinders A and B are rigidly connected together to form one piston rod (134). A linear-to-rotary transition mechanism is provided between the piston rod (134) and a spool (19) of the rotary motion valve. Since the low-capacity solar power supply is adopted in the system, the equipment cost, the operation cost and the maintenance cost of the system are reduced, and the input-output ratio of the system is increased.
D: Disclosed is a lubricating grease delivery system of a coal mine rail transportation vehicle, comprising an oil reservoir (1) and an oil pump (2). An outlet pipeline of the oil pump (2) is divided into two branches via a T joint, wherein an electromagnetic reversing valve (3), a manual three-position four-way reversing valve (5) and an energy accumulator (4) are connected in sequence on one branch, inlet and outlet pipelines of the manual three-position four-way reversing valve (5) are connected with a composite hydraulic cylinder  a , and the front part of the composite hydraulic cylinder  a  is connected with a grease reservoir (6);a first one-way speed control valve (9) and a three-position four-way electromagnetic reversing valve (10) are arranged in sequence on the other branch, and inlet and outlet pipelines of the three-position four-way reversing valve (10) are connected with a composite hydraulic cylinder  b ; a lubricating grease outlet of the composite hydraulic cylinder  a  is connected with a one-way valve bridge (8) through a pipeline, and pipelines on two sides of the one-way valve bridge (8) are respectively connected to a lubricating grease inlet and a lubricating grease outlet of the composite hydraulic cylinder  b ; and two limiters for limiting the travel of a piston rod are arranged at the front part of the piston rod of the composite hydraulic cylinder  b . The lubricating grease delivery system completes the delivery of lubricating grease by means of alternating operations of the two composite hydraulic cylinders, and has the characteristics of small size, high pressure, high flow rate and stable operation.
Answer: B