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| Number | Title | Issue Date |
| 6244828 | Pump and combination pump and trap with snap-over mechanism and double-seal outlet valve A combination pump and trap is disclosed which includes a snap-over mechanism useful for small floats with little buoyancy. The snap-over mechanism has a geometry in which the distance between the float or compression arm pivot point and the pivot for the... | 06/12/2001 |
| 5938409 | Gas powered fluid pump with exhaust assist valve A gas powered pump tank is alternately filled with liquid such as water at low pressure, and then emptied by gas pressure such as from pressurized steam. An auxiliary exhaust assist valve opens at a threshold pressure after switching from the pumping phas... | 08/17/1999 |
| 5401142 | Condensate discharging device In order to enable only condensate to be discharged/fed under pressure without leaking out steam independently of the respective pressures at the primary side and at the secondary side, in a condensate discharging device comprising a condensate receiving ... | 03/28/1995 |
| 5366349 | Automatic liquid pump with vapor flow prevention flow outlet valve An automatic liquid pump contained within a sealed pressure vessel. The pressure vessel includes a liquid inlet opening, a liquid outlet opening, a gas inlet and a gas outlet. A preloaded float-operated over-center valve mechanism closes the gas inlet val... | 11/22/1994 |
| 4842487 | Pumping device using pressurized gas There is provided an improved fluid pumping device including an enclosure to be placed downhole in a well. A first hollow tube is received in the enclosure and extends to the surface of the well for removing fluid from the well. A second hollow tube also ... | 06/27/1989 |
| 4828461 | Apparatus for metering flowable materials in sand core making machines Apparatus for transferring metered quantities of a flowable bonding agent from a tank into a mixer of a sand core making machine has an upright tubular vessel into which the bonding agent is drawn from the tank by a suction pump and a pressure pump which ... | 05/09/1989 |
| 4770610 | Frail material slurry pump A pump for pumping a slurry of frail material is provided by a rigid chamber which is connected to a source of negative air pressure when an inlet valve is open and an outlet valve closed to suck the slurry through the open inlet valve into the chamber, t... | 09/13/1988 |
