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| Number | Title | Issue Date |
| 7325565 | Backflow valve The backflow valve of the present invention includes a valve housing having a cavity therein with an inlet and an outlet to the valve cavity. A switch is in communication with the valve cavity and is moveable from an off position to an on position in response to liq... | 02/05/2008 |
| 7044165 | Outflow regulator for a gravity-fed liquid outlet An outflow regulator for a gravity-fed liquid outlet of a liquid reservoir comprising a restriction plate mountable within the liquid outlet for limiting a flow rate of an effluent. The restriction plate allows a lower passage for the effluent when a first level of ... | 05/16/2006 |
| 5535768 | Method and apparatus for reducing damper operating pressure A method and apparatus for venting the seal air pressure within an isolated system so as to obtain a relatively small, in the range of 4 to 8 inches water gauge more or less, pressure differential across the isolation dampers. This small pressure differen... | 07/16/1996 |
| 5402816 | Pressure equalizer device A pressure equalizer device for load balancing systems; the device comprises an hollow body (16) defining a pressure equalizing chamber having fluid inlet and outlet apertures at opposite ends thereof, and a pressure release valve on the outlet side of th... | 04/04/1995 |
| 4510967 | Anti-backflow valve for therapy tubs and the like An anti-backflow valve for installation in a blower discharge line of a therapy tub aeration system has an air inlet, an air outlet, and an auxiliary outlet in its housing. A spring-loaded check valve member within the housing precludes fluid flow outward... | 04/16/1985 |
| 4301824 | Sump level maintenance system In a fluid circulation system of the type having a pump for supplying pressurized fluid to an apparatus requiring a supply of pressurized fluid, a sump containing a volume of fluid from which the pump draws its supply, and an overage fluid return line, a ... | 11/24/1981 |
