Double-valve continuous circulating valve with a clamping device

A novel double-valve continuous circulating valve with a clamping device, comprising a main through valve (5), a pup joint body (8), a middle connector (11) and a bypass valve (12), wherein:

• the pup joint body (8) is a hollow shaft, with threaded sections set at a lower end and at an upper end;
• the main through valve (5) and a main through valve spring (6) are arranged in the pup joint body (8);
• the main through valve (5) is provided with the main through valve spring (6) at the lower end and a main through valve seat (4) at the upper end;
• the main through valve seat (4), the main through valve (5) and the main through valve spring (6) are press-fitted in the pup joint body (8) by a main through valve limiting device (1);
• the main through valve (5) has a hemispherical structure on top, a plurality of radial through holes made in middle, and a toothed structure at bottom;
• a limit step is arranged outside the main through valve (5) to match with the main through valve spring (6), with an outer diameter less than the inner diameter of the pup joint body (8), so that the main through valve (5) can slide up and down within the pup joint body (8);
• A stepped hole is arranged at a lower side of the pup joint body (8), specifically located below the main through valve spring (6), and a bypass valve seat (10) is provided inside the stepped hole;
• the bypass valve (12) is mounted and fixed to the bypass valve seat (10) through a bypass valve limiting device (9);
• the middle connector (11) is arranged outside the bypass valve limiting device (9);
• the bypass valve (12) has a spherical raised structure in middle of one end of the bypass valve (12), and the spherical raised structure is provided with a guide device;
• a composite disk spring is provided between the bypass valve (12) and the bypass valve limiting device (9), and the composite disk spring is composed of multiple sets of stacked disc springs;
• the middle connector (11) is of round pipe structure and press-fitted on the pup joint body (8) through a clamping device;
• the clamping device is arranged on the circumferential surface of the pup joint body (8), and composed of a clamping plate 1 (7) and a clamping plate 2 (14) connected with each other using a hinge pin (17), a nut (15), a gasket (16) and a bolt (18).