US Patent 7458388 Freeze safe valve

A freeze safe valve includes a housing coupled between an upstream tube and a downstream tube of a water flowing or supplying line for shutting off the water flowing or supplying line and for opening a drain port in response to the formation of ice on the downstream side of water flowing or supplying line, and thus for alleviating the pressure on the downstream side and for precluding or eliminating water damage from frozen, broken pipes, etc. A flexible valve member is disposed in the housing for selectively blocking the drain port of the housing by the fluid flowing into the housing and for selectively blocking the an orifice of a plate by a spring member.