Patent ID: 6684415
Filing Date: 2004-02-03
Classification: E03C,Y10T

Abstract:
A ventilating apparatus to supply a gas to a conduit which apparatus comprises a first ventilation pipe and a second ventilation pipe each having a spherical body which freely moves up and down therein whereinthe first ventilation pipe has an opening at a lower end thereof to connect to the conduit at a predetermined point, the second ventilation pipe has an opening at a lower end thereof to serve as an intake port for the gas to be supplied, an upper end of the first ventilation pipe and an upper end of the second ventilation pipe are communicated with each other so that a gas path is formed from the lower end of the second ventilation pipe to the lower end of the first ventilation pipe, the gas path being opened and closed by at least one of the spherical bodies moving up and down in the ventilation pipe in accordance to a force acting on the spherical body, a valve seat for the spherical body moving up at an upper end side of the first ventilation pipe, a stopper for the spherical body moving down at a lower end side of the first ventilation pipe, a valve seat for the spherical body moving down at a lower end side of the second ventilation pipe, and a stopper for the spherical body moving up at an upper end side of the second ventilation pipe, wherein when at least one spherical body is seated on the valve seat, the gas path is closed, and a seal forming member on the valve seat, and the spherical body being seated on the valve seat through the seal forming member.