Patent ID: 11959563
Assignee: FESTO SE &CO. KG
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A membrane valve, with a valve housing, in which a housing interior is formed, in which housing interior a flexible control membrane is arranged, said control membrane together with a base wall of the valve housing which lies opposite it in a height direction of the valve housing delimiting a control chamber which communicates with several valve channels, wherein at least one controllable valve channel of the several valve channels which runs into the control chamber and whose channel run-out in the control chamber is framed by a valve seat passes through the base wall, wherein a drive plunger lies opposite the valve seat of each controllable valve channel at the side of the control membrane which is away from the base wall in the height direction, said drive plunger comprising a shank body with a peripheral outer lateral surface, said shank body extending in a plunger longitudinal direction and with a guide section being linearly displaceably guided in the height direction in a guide recess of the valve housing which is delimited by an inner lateral surface, wherein each drive plunger can be driven by way of a drive device into a drive travel movement which is to and fro in the height direction of the valve housing, by which means a closure section of the control membrane which is arranged between a front end-face of the shank body which faces the base wall, and the opposite valve seat of a controllable valve channel is selectively movable into a closure position which is pressed upon the assigned valve seat or into an open position which is lifted from this valve seat, and wherein the outer lateral surface of the shank body of the drive plunger at least in the region of the guide section comprises a polygonally contoured prismatic shaping with a succession of outer side edges and outer side surfaces, said edges and surfaces extending in the plunger longitudinal direction and said succession alternating in the circumferential direction of the drive plunger, and
wherein the outer side edges of the prismatic guide section of the shank body of the drive plunger are convexly rounded, and
wherein the outer side edges of the prismatic guide section of the shank body of the drive plunger are either not bearing at all on the inner lateral surface of the guide recess or bearing with a narrow surface contact.