Ultrahigh pressure reversing valve

An ultrahigh pressure reversing valve comprises a main valve and a reversing valve body controlling work of the main valve. A bidirectional hydraulic lock is arranged between the main valve and the reversing valve body, a low-pressure chamber and a high-pressure chamber are formed in a valve body of the main valve, an oil port K1 and an oil port K2 are arranged on the two sides of the low-pressure chamber respectively, an ultrahigh pressure oil inlet A1 and an ultrahigh pressure oil outlet B2 are arranged on the two sides of the high-pressure chamber respectively, a T-shaped control valve element is arranged in the low-pressure chamber, one end of the T-shaped control valve element stretches into the high-pressure chamber, a valve sleeve is arranged in the high-pressure chamber, and a high-pressure sealing part matched with the valve sleeve is arranged at the other end of the T-shaped control valve element. High pressure reversing is controlled by means of low-pressure piloting, a plunger at the other end of the valve element with an ultrahigh pressure seal is pushed to open and close ultrahigh pressure oil paths, and therefore the ultrahigh pressure oil path A1 and the ultrahigh pressure oil path B1 are opened and closed; the bidirectional hydraulic lock is arranged in a control oil path, so the stroke of the plunger is controlled more precisely when the main valve is reversed; meanwhile, security and reliability of system running are guaranteed. The control valve element of a seal and plunger pair structure resisting the pressure of 80 Mpa is adopted, good adaptability between the seal and the plunger is achieved, the problems of gross leak, boosting and differential pressure maintaining in an ultrahigh pressure reversing loop are solved, and high technological economical efficiency is achieved.