Device for temporarily rinsing a water cock countersunk in the ground
Patent 4393891 Issued on July 19, 1983. Estimated Expiration Date: 
September 22, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 22, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 574744 1297001 1501799 3262464 3559677 3576193 3650471 3913602 Fire hydrant with drain valve and backflow preventer mechanism Patent #: 3980097 InventorsAssigneeApplicationNo. 06/304678 filed on 09/22/1981US Classes:137/238, Cleaning or steam sterilizing134/166C, Conduit cleaner137/299, With valve at outlet137/300, With supplemental valve137/505.13, Senses inlet pressure222/148, WITH CLEANING MEANS251/50Line pressure connected dashpot or choke chamberExaminersPrimary: Walton, George L.Attorney, Agent or FirmInternational ClassesE03B 9/00 (20060101)E03B 9/14 (20060101) E03B 9/08 (20060101) Foreign Application Priority Data1980-09-23 NLAbstractThe present invention relates to a device for periodically rinsing a water cock countersunk in the ground. A drainpipe is connected between the water cock and a closing member of an extension piece. The drainpipe includes a valve body which is opened by the water pressure prevailing in the extension pipe when the water cock is initially opened. After a predetermined period of time the valve body is closed. Thus, the present invention ensures that after the water cock is opened dirt is flushed away through the drainpipe which is subsequently automatically closed after a predetermined time. After the drainpipe is closed, a valve member connected to the extension pipe can be opened and only pure water will be supplied.Field of SearchCleaning or steam sterilizingWith separate material addition HYDRANT TYPE Expansible chamber operated by valve actuator for draining riser Valve actuator outside riser With valve at outlet With supplemental valve Stop and waste Separate relatively movable valves with single actuator With screw or gear in actuating mechanism Flow path with serial valves and/or closures With independent valve controller Senses inlet pressure | |
