Patent ID: 7389969
Filing Date: 2008-06-24
Classification: F16K

Abstract:
1. A chemical liquid valve comprising: a mounting plate; a valve element; a body made of resin and provided with an inlet port, an outlet port, a bottom portion with thickness-reducing parts configured to render a uniform thickness to the bottom portion, and at least one rib defined by the thickness-reducing parts and placed in contact with the mounting plate; a valve seat made of resin provided between the inlet port and the outlet port; and a driving device coupled to the valve element and arranged to bring the valve element into and out of contact with the valve seat, wherein the driving device includes: the valve element includes a columnar valve element part movable into and out of contact with the valve seat, a thin diaphragm part connected to the valve element part, and an engagement part formed coaxially with the valve element part and with a semispherical top end, the engagement part disposed in the recess through the cutout portion and engaged in the recess so that the valve element is swingably held by the driving device so as to tilt the valve element to apply a uniform force to the valve seat when the valve element is in a swinging position, and the engagement part makes point contact with an inner upper wall of the recess during a valve closed state and engages with an inner lower wall of the recess during a valve open state to form a clearance between a top end of the engagement part and the inner upper wall of the recess.