# US 9,435,460 B2 · Electromagnetic apparatus and method for controlling fluid flow > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,460 B2 - Document ID: US9435460B2 - Status: Granted - Kind: B2 - Application number: 13/998,468 - Filed: 2013-11-01 - Published: 2014-07-03 - Granted: 2016-09-06 - Earliest claimed: 2000-02-29 - Assignees: Sloan Value Company - Applicants: Kay Herbert; Xiaoxiong Mo; Fatih Guler; Natan E. Parsons - Inventors: Kay Herbert; Xiaoxiong Mo; Fatih Guler; Natan E. Parsons - Web page: https://patentgrep.com/patent/US9435460B2 ## CPC - F16K 31/0675: {Electromagnet aspects, e.g. electric supply therefor} - F16K 7/16: the diaphragm being mechanically actuated, e.g. by screw-spindle or cam - F16K 31/0655: {Lift valves} - F16K 31/0672: {the valve member being a diaphragm} - F16K 31/082: {using a electromagnet and a permanent magnet} - F16K 37/00: Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given - F16K 37/0041: {for measuring valve parameters (F16K37/0033 takes precedence)} - F16K 41/12: with approximately flat diaphragm - 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 An actuator including actuator base, bobbin, and pole piece forming a pocket for a ferromagnetic armature located therein. The actuator including a radial magnet and a solenoid coil constructed and arranged to cause a linear displacement of the armature upon application of a coil drive current from a control circuit. The actuator may include a flexible membrane that partially encloses the armature to form an armature chamber filled with an incompressible fluid. In a valve design, a fluid flow is stopped by driving the membrane against a valve seat. Pressure from the controlled fluid in the conduit is transmitted through the membrane to the fluid within the armature chamber so that the armature does not need to counteract force applied to the membrane by the conduit fluid's pressure. A fluid flow is opened by driving the membrane away from the valve seat. ## Claims ### Claim 1 An electromagnetic actuator, comprising: a solenoid coil and an armature housing, providing an armature chamber, constructed and arranged to receive a movable armature including a distal part; a membrane arranged to enclose at least partially said distal part to seal armature fluid inside said armature chamber providing a volume in which said armature fluid is enclosed, said armature being constructed to control flow of fluid through a valve passage by a linear displacement of said distal part caused by a coil drive current applied to said solenoid coil thereby acting on said armature, said displacement of said distal part displaces said membrane with respect to said valve passage controlled by said actuator; a fluid passage arranged within said armature and constructed to enable force-balancing fluid displaced between a proximal part and a distal part of said armature during said displacement; and a radial magnet arranged to maintain said armature in a stationary position by a force of a magnetic field. ### Claim 2 (depends on 1) The actuator of claim 1 wherein said distal part of said armature is arranged to compress said membrane against a valve seat when closing said valve passage while said armature is disposed in its extended armature position. ### Claim 3 (depends on 2) The actuator of claim 2 further including an armature sensor constructed to detect displacement of said armature. ### Claim 4 (depends on 3) The actuator of claim 3 further including a control circuit constructed to apply said coil drive current to said solenoid coil in response to an output from said armature sensor. ### Claim 5 (depends on 1) The actuator of claim 1 further including a bias spring positioned and arranged to biases said armature toward its extended position. ### Claim 6 An electromagnetic actuator, comprising: a solenoid coil and an armature housing constructed and arranged to receive in an armature chamber a movable armature including a distal part; a control circuit constructed to apply a coil drive current to said solenoid coil and thereby cause a linear displacement of said distal part with respect to a valve passage controlled by said actuator; a membrane arranged to enclose at least partially said distal part to seal armature fluid inside said armature chamber providing a volume in which said armature fluid is enclosed, said linear displacement of said distal part displaces said membrane with respect to said valve passage controlled by said actuator; and a radial magnet arranged to maintain said armature in a stationary position by a force of a magnetic field without application of said coil drive current. ### Claim 7 (depends on 6) The actuator of claim 6 wherein said armature includes a spring cavity constructed and arranged to receive a bias spring positioned and arranged to compress a portion of said membrane against a valve seat when closing said valve passage while said armature is disposed in its extended armature position assisted by said bias spring. ### Claim 8 (depends on 7) The actuator of claim 7 further including an armature sensor constructed to detect displacement of said armature. ### Claim 9 (depends on 6) The actuator of claim 6 wherein said control circuit is powered by a battery. ### Claim 10 (depends on 6) The actuator of claim 6 wherein said radial magnet includes a single ring-like member. ### Claim 11 (depends on 6) The actuator of claim 6 wherein said radial magnet includes two or more semicircular members. ### Claim 12 (depends on 6) The actuator of claim 6 wherein said radial magnet includes several discrete magnets located radially with respect to said ferromagnetic armature. ### Claim 13 (depends on 6) The actuator of claim 6 wherein said control circuit is operatively connected to an external object sensor. ### Claim 14 (depends on 13) The actuator of claim 13 wherein said object sensor includes a motion sensor. ### Claim 15 (depends on 13) The actuator of claim 13 wherein said object sensor includes a presence sensor. ### Claim 16 (depends on 13) The actuator of claim 13 wherein said object sensor includes a passive optical sensor. ### Claim 17 (depends on 6) The actuator of claim 6 further including an armature sensor constructed to detect displacement of said armature. ### Claim 18 (depends on 17) The actuator of claim 17 wherein said armature sensor is constructed to provide signals to said control circuit in a feedback arrangement. ### Claim 19 (depends on 17) The actuator of claim 17 wherein said control circuit is constructed to apply said coil drive current to said coil in response to an output from said armature sensor. ### Claim 20 (depends on 6) The actuator of claim 6 wherein said movable armature includes a fluid passage constructed to enable force-balancing fluid displaced between a proximal part and a distal part of said armature during said displacement.