Patent ID: 7475704
Filing Date: 2009-01-13
Classification: F16K,F25B,Y10T

Abstract:
1. A valve drive device comprising: a valve seat plate in which an inflow port for fluid and an outflow port for the fluid are formed so as to penetrate through the valve seat plate in its thickness direction; a sealing case which covers a front face side of the valve seat plate; an inflow pipe which is fixed in a rear face side of the valve seat plate so as to be in communication with the inflow port; an outflow pipe which is fixed in the rear face side of the valve seat plate so as to be in communication with the outflow port; and a valve element which slides on an area where the outflow port is formed on the front face side of the valve seat plate to open or close the outflow port; wherein the valve seat plate comprises: wherein the deformation preventing member is a third plate member made of a planar thin plate which is formed in a size to cover an approximately entire face of the second plate member and an outer side of the third plate member is fixed on the rear face of the second plate member; and wherein the third plate member is provided with four fixing parts which are fixed on the rear face of the second plate member and the fixing parts are disposed such that straight lines connecting two opposite fixing parts to each other are roughly perpendicular to each other.