Jar dynamic formula prefill valve

The utility model discloses a jar dynamic formula prefill valve, disk seat, main valve and piston rod including coaxial setting, the disk seat is equipped with the pore that overflows of having a perfect understanding its up end and lower terminal surface, the main valve sets up in the disk seat below, be equipped with conical surface sealing between main valve and the disk seat, be equipped with the drive chamber in the main valve, on the disk seat was fixed in to the piston rod upper end, the lower extreme stretched into in the drive chamber, will mutual confined epicoele and cavity of resorption are separated into to the drive chamber, the main valve can the drive masterpiece in drive chamber reciprocates under with, in order closed or open overflows at the pore. The utility model discloses jar dynamic formula prefill valve through the removal of piston rod direct drive main valve, cancels the spring in the structure, thoroughly eliminated the risk that arouses the trouble because of disconnected spring, has improved the reliability of equipment.