# US 2017/0284244 A1 · Switching Membrane for a Pressure Control Valve and a Pressure Control Valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284244 A1 - Document ID: US20170284244A1 - Status: Published application - Kind: A1 - Application number: 15/475,579 - Filed: 2017-03-31 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: Mann+Hummel GmbH - Applicants: Mann+Hummel GmbH - Inventors: Lukas Bock; Jens Burkhardt; Volker Kuemmerling; Thomas Jessberger - Web page: https://patentgrep.com/patent/US20170284244A1 ## CPC - F01M 13/023: {Control valves in suction conduit} - F01M 13/0011: {Breather valves} - F16K 7/126: {the seat being formed on a rib perpendicular to the fluid line} - F16K 7/17: the diaphragm being actuated by fluid pressure - F16K 17/04: spring-loaded - F16K 24/04: for venting only (F16K24/02 takes precedence) - F16K 25/005: {Particular materials for seats or closure elements} - F01M 2013/0016: {with a membrane} - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} ## Abstract A switching membrane for a pressure control valve has a plate-shaped flat body with a central area and a bending area surrounding the central area. The central area is provided with a closure area. For switching the switching membrane, the central area can be moved back and forth by a bending movement of the bending area in a direction transverse to an extension of the central area. At least the bending area is made of fluorocarbon rubber. A pressure control valve, especially for crankcase ventilation, is provided with a valve housing that has a housing cover and further is provided with a valve seat. A switching membrane as described above is disposed in the valve housing and switches at pressure differences of at most 500 mbar to release or shut off a flow of fluid at the valve seat. ## Claims ### Claim 1 A switching membrane for a pressure control valve, the switching membrane comprising; a plate-shaped flat body comprising a central area and a bending area surrounding the central area, wherein the central area comprises a closure area; wherein, for switching the switching membrane, the central area is configured to be moved back and forth by a bending movement of the bending area in a direction transverse to an extension of the central area; wherein at least the bending area comprises fluorocarbon rubber. ### Claim 2 (depends on 1) The switching membrane according to claim 1, wherein the central area is comprised at least partially of plastic material. ### Claim 3 (depends on 1) The switching membrane according to claim 1, wherein the plate-shaped flat body further comprises a clamping area extending radially outside of the bending area, wherein the clamping area is comprised of plastic material. ### Claim 4 (depends on 1) The switching membrane according to claim 1, wherein the closure area comprises a sealing area and the sealing area is comprised at least partially of fluorocarbon rubber. ### Claim 5 (depends on 4) The switching membrane according to claim 4, wherein the sealing area has an annular shape. ### Claim 6 (depends on 1) The switching membrane according to claim 1, wherein the bending area extends in a radial direction as a corrugation about the central area. ### Claim 7 (depends on 1) The switching membrane according to claim 1, wherein the closure area is a cup-shaped protuberance of the central area. ### Claim 8 (depends on 1) The switching membrane according to claim 1, wherein the plate-shaped flat body has a diameter measuring between 40 mm and 100 mm. ### Claim 9 (depends on 8) The switching membrane according to claim 8, wherein the diameter measures between 50 mm and 80 mm. ### Claim 10 (depends on 1) The switching membrane according to claim 1, produced by two-shot injection molding. ### Claim 11 A pressure control valve for control or regulation of a fluid pressure, the pressure control valve comprising: a valve housing comprising a housing body and a housing cover, wherein the housing body comprises a valve seat; a switching membrane disposed inside the valve housing and configured to switch at pressure differences of at most 500 mbar to release or shut off a flow of fluid at the valve seat; the switching valve comprising a plate-shaped flat body, wherein the plate-shaped flat body comprises a central area and a bending area surrounding the central area, wherein the central area comprises a closure area, wherein, upon switching of the switching membrane, the bending area by a bending movement moves the central area relative to the valve seat in a direction transverse to an extension of the central area toward the valve seat or away from the valve seat, and wherein at least the bending area comprises fluorocarbon rubber. ### Claim 12 (depends on 11) The pressure control valve according to claim 11, further comprising a spring element supported on the valve housing and exerting a force on the central area of the switching membrane. ### Claim 13 (depends on 12) The pressure control valve according to claim 12, wherein the spring element is supported on the central area. ### Claim 14 (depends on 12) The pressure control valve according to claim 12, wherein the closure area is a cup-shaped protuberance of the central area, wherein the spring element is arranged about the cup-shaped protuberance. ### Claim 15 (depends on 11) The pressure control valve according to claim 11, wherein a chamber of the valve housing is loadable with atmospheric pressure as control pressure. ### Claim 16 (depends on 11) The pressure control valve according to claim 11, wherein the switching membrane is configured to switch at pressure differences of at most 200. ### Claim 17 (depends on 16) The pressure control valve according to claim 16, wherein the switching membrane is configured to switch at pressure differences of at most 100. ### Claim 18 (depends on 11) The pressure control valve according to claim 11, configured for crankcase ventilation of an internal combustion engine.