Energy-recycling hydraulic control main valve

An energy-recycling hydraulic control main valve, comprising end covers (1), a valve core (2), a left one-way valve (3) and a right one-way valve (4);

• wherein each of two ends of the valve core (2) is provided with one end cover (1), the valve core (2) is provided with a left oil port, a first oil port (A), a second oil port (I/L), a third oil port (I/M), a fourth oil port (I/R), a fifth oil port (B), a right oil port and a sixth oil port (P) thereon;
• a spring (5) and a spring seat (6) are arranged between each of the end covers (1) and the valve core (2);
• the left one-way valve (3) and the right one-way valve (4) are respectively embedded in the left end and the right end of the valve core (2);
• the left one-way valve (3) is composed of a left valve seat (3-1), a left cone valve core (3-2) and a left spring (3-3);
• a conical surface of the left cone valve core (3-2) is closely attached to a left conical surface of the valve core (2) by the action of the left spring (3-3);
• the right one-way valve (4) is composed of a right valve seat (4-1), a right cone valve core (4-2) and a right spring (4-3);
• and a conical surface of the right cone valve core (4-2) is closely attached to a right conical surface of the valve core (2) by the action of the right spring (4-3);
• wherein a left first central hole and a right first central hole (2-1) are disposed on the central line of the valve core (2);
• the two first central holes (2-1) are in communication with each other via a second central hole (2-2) which diameter is smaller than diameters of the two first central holes (2-1), and frustum holes (2-3) are respectively formed at junctions of the second central hole (2-2) and each of the first central holes (2-1);
• a left oil-feeding throttling groove (2-4) and a right oil-feeding throttling groove (2-5) are disposed between the sixth oil port (P) and the third oil port (I/M);
• a left throttling groove (2-6) is disposed between the first oil port (A) and the second oil port (I/L);
• a left oil-returning hole assembly composed of a left first throttling hole (2-7), a left second throttling hole (2-8) and a left third throttling hole (2-9) is disposed between the left oil port and the second oil port (I/L);
• the left second throttling hole (2-8) is in communication with the first oil port (A);
• a right throttling groove (2-10) is disposed between the fifth oil port (B) and the fourth oil port (I/R);
• a right oil-returning hole assembly composed of a right first throttling hole (2-11), a right second throttling hole (2-12) and a right third throttling hole (2-13) is disposed between the right oil port and the fourth oil port (I/R);
• and both the right second throttling hole (2-12) and the right third throttling hole (2-13) are in communication with the fifth oil port (B).