Patent ID: 8025268

Claim:
A manual valve comprising; an inlet port; an outlet port; a valve seat formed in a passage for fluid, communicating the inlet port to the outlet port, a valve element that is movable into or out of contact with the valve seat to control a flow of the fluid; a rod connected to the valve element; and a knob for moving the rod by screw feeding in an opening/closing direction of the valve element, the manual valve being arranged to move the valve element through the rod by rotation of the knob, wherein the rod is formed with an external thread portion on an outer periphery thereof, the rod being unconnected to the knob but being held against rotation, the manual valve further comprises a rod feeding member of a cylindrical shape, the rod feeding member being rotatably held and internally formed with an internal thread portion to be threadedly engaged with the external thread portion of the rod, and an engagement member fixed to the knob, the engagement member being elastically deformable to be engaged with the rod feeding member and disengaged from the rod feeding member when a larger torque than a predetermined value is applied to the engagement member.