- Double-headed, right-handed, convex screw composed of two driven screw an active screw - double, left, concave screw, installed in the pump body, and other components constitute a screw pump. Working principle: V dense formation: must meet the four sealing conditions, in order to form a seal product: master and slave screw conjugate, the number of screws and the number of threads must meet a certain relationship, the minimum length of the pump body should be greater than the lead screw, guaranteed Minimum radial clearance, in order to form a space eight-letter sealed volume. The left side of the oil absorption V density change: When the active screw counterclockwise rotation <Right pressure oil pressure port separated: The above four sealing conditions Features: Simple structure, small size, light weight, stable operation, low noise, long life, Uniform flow, self-absorption ability, high volumetric efficiency, no trapped oil phenomenon; but the screw tooth complex, difficult to process, the accuracy is difficult to guarantee.