Patent ID: 9458943
Filing Date: 2016-10-04
CPC Classification: F16K,Y10T

Claim Text:
1. A diaphragm valve for fluid control, comprising a valve housing having a valve chamber, into which at least three passageways open, wherein the passageways have associated therewith valve seats provided in the valve housing, a diaphragm having various diaphragm sections which can be pressed against associated valve seats in order to selectively open and close flow connections between passageways, and at least two control pistons which are displaceably accommodated in respectively associated cylinder chambers, and which are respectively coupled with the control pistons' associated diaphragm sections via a pressure transfer unit in order to move the associated diaphragm section into an opening or closing position during the movement of the control piston, each of the pressure transfer units having two opposite ends portions, wherein one end portion is associated to the diaphragm section and the opposite end is coupled to the associated control piston, wherein the cylinder chambers of a pair of adjacent control pistons are located at equal axial height, so that the pair of adjacent control pistons can be moved next to each other, wherein each of the pair of adjacent control pistons have a substantially flat peripheral wall section and an arc-shaped peripheral wall section, wherein the flat peripheral wall section of the pair of adjacent control pistons face each other and wherein the substantially flat peripheral wall section and the arc shaped peripheral wall section are accommodated within the respectively associated cylinder chambers of the pair of adjacent control pistons.