Gas flow regulation valve controlling device for e.g. gas boiler, has return spiral spring disposed axially between rotor and movable unit of valve and axially traversed by shank of screw

摘要

The device has a stator (14) and a rotor (26) rotatively coupled to a nut (28). A guiding body (38) has a bearing (30) and a return spiral spring (34). A fixed sealing jacket (20) covers the rotor and its front axial end is opened. The spiral spring is disposed axially between the rotor and a movable unit of the valve and is axially traversed by a shank (42) of a screw (46).