Actuator for butterfly valves

摘要

An actuator for a butterfly valve, having a gearbox, an actuator stem and a handle. The actuator stem is formed as a single piece, comprising a position indicator, seal disc, worm gear, and stem shaft with splines for fitting into the valve. The handle is also formed as a single piece, comprising the wheel or knob, shaft, and worm for operating the worm gear. By forming the gearbox as a single piece as well, the entire actuator can be made as three major pieces. Optionally, the gearbox can be formed with cylindrical fittings which press-fit over pins on the valve, replacing the conventional mounting bracket.

主权项

1. An actuator for butterfly valves, comprising:
a) a gearbox having an upper surface, a lower surface, a first side surface and an opposing second side surface, and a hollow interior; b) a stem passing through a hole in the upper surface of the gearbox, through the hollow interior, and through a hole in the lower surface of the gearbox, comprising, arranged axially along the stem from an upper end to a lower end:
a seal disc for sealing the hole in the upper surface of the gearbox;a worm assembly with a worm gear; anda stem shaft having a lower end for inserting into and actuating the valve;the stem being integrally formed as a single piece, c) a handle passing through a hole in the first side surface of the gearbox, through the hollow interior, and through a hole in the second side surface of the gearbox, comprising, arranged axially along the stem from a first end to a second end:
a knob;an outer shaft portion;a seal disc;an intermediate portion;a worm; andan end portion;the handle being integrally formed as a single piece; and d) a valve attachment on the lower surface of the gearbox.