Abstract: This invention is directed to an apparatus for dosing a solution into a liquid conduit by means of a piston dosing pump mechanically driven by the liquid pressure, which comprises a dosing pump having a chamber containing liquid from the conduit and into which the solution is delivered from a supply source, a spring-biased nonreturn valve between the dosing pump chamber and the liquid conduit, and a second pump which supplies fresh liquid to the dosing pump chamber, the piston of the second pump being synchronized with the piston of the dosing pump.

Abstract: A method and apparatus for pumping combustible gases at high pressure without raising the gas to its combustion temperature, the apparatus including a piston-type pump having an intake chamber communicating with a cylinder through intake valves, a discharge chamber communicating with the cylinder through discharge valves, the intake chamber and the discharge chamber having cooling means therearound for cooling gas in the chambers, the valving being such that gas must pass entirely through the intake chamber for maximum cooling on intake, and gas must pass entirely through the discharge chamber on discharge for maximum cooling on discharge, some gas being held in the discharge chamber during compression of the gas for maximum cooling.

Abstract: Apparatus for connecting to a pump inlet where a first inlet feedpipe is attached including a second inlet feedpipe tap having a one-way check valve, and a resilient orifice member in the first inlet feedpipe upstream of the tap, whereby the orifice size is less than the inlet feedpipe size so as to provide a flow restriction for periodically creating negative pressure in the region of the tap, to draw liquid from the second inlet feedpipe into the first inlet feedpipe.

Abstract: A system for preparation of variable hemodialysate in which a controllable pump meters multiple fluid sources of dialysate concentrates and water in controlled proportion. The system includes a plurality of cylinder and piston pump assemblies linked together for simultaneous operation. Individual valves connect the separate pump assemblies to the individual fluid sources to be proportioned. A position sensor provides signals indicative of the position of the pistons throughout their stroke cycle, and with a control operates the control valves associated with the individual pump assemblies in accord with functions of piston position and preselected proportioning control inputs, so as to control the volume of fluid metered by each of the pumps during the pump stroke.

Abstract: A water-sealed type vacuum pump characterized in that a suction pipe connected to a chamber to be vacuumized above liquid containing cylinders, which are provided at the lower portion thereof with a mechanism for alternatively increasing and decreasing a pressure of liquid, is open to a lower portion of a suction chamber through an intake valve, the liquid containing cylinders each being interiorly provided with a valve means so as to discharge the liquid through the valve means when the liquid pressure is high while to suck air from the suction pipe when the liquid pressure is low, and a liquid circulating device is provided to return the liquid to be discharged thereby effecting stabilized suction and discharge, the liquid containing cylinders being further interiorly provided with a fluid cooling device to cool and liquidize the sucked air.

Abstract: Improved valve apparatus for expansible chamber devices, such as reciprocating piston compressors, includes in a preferred embodiment, a chamber having two chamber intake ports, each normally closed by a respective valve member. A first valve member is biased to close a first port, and a second member is more forcefully biased to close a second port which is larger in cross-sectional area than the first port. The first valve member opens the first port in response to an intake pressure differential less than that which will open the second port. Subsequently, and upon increased intake pressure differential, the second valve member opens the second port and reduces the working pressure affecting the first valve. This permits the first valve to positively close its port at or near the end of the suction stroke of the piston, the second valve also closing its port due to the more forceful bias.

Abstract: A cylinder houses a slidable piston that is separated into two axially spaced portions. A rod interconnects the portions and permits lost motion between the portions when the piston is slid in either direction in the cylinder. By valving and conduits, the piston and cylinder draw quanta of air and liquid mix, for ice milk or the like, together in selected proportion, mix these together and forward them from the pump, e.g. to a freezing chamber. Means are provided, for instance the rod may be exchanged for one of another size, for varying said selected proportion. Preferably a sensor is provided to cause the pump to operate intermittently, e.g. to replenish mix which has been withdrawn from the freezing chamber. Also by preference the freezing chamber is maintained at 10-40 p.s.i.g. in order to tend to prevent reduction of overrun between the time when the air is mixed with the liquid mix and the time when the frozen confection is dispensed.

Abstract: A pumping system for conveying animal waste from a livestock housing to a remote storage area includes a hopper which is conveniently located in a pit adjacent to a chain driven barn cleaner or the like, a vertically oriented upwardly open pumping chamber in communication with the hopper and a hydraulically operated ram which travels vertically through the hopper into the pumping chamber to force the waste through a reducer and discharge pipe to a storage pit or area located remote from the livestock housing. Other features include a vacuum relief valve located in the pumping chamber or ram to release the vacuum on the return stroke of the ram and thus, reduce the power required to move the ram to its retracted position. The vacuum relief valve also eliminates the need in some installations for a check valve to prevent reverse flow of manure into the hopper from the storage pit.

Abstract: A positive displacement device is disclosed and includesA. a housing defining a fluid intake discharge chamber,B. a seal housing adjacent the chamber housing,C. a piston adapted to reciprocate in the seal housing and the fluid intake and discharge chamber,D. a seal adapted to prevent flow of fluid from the fluid intake and discharge chamber to said seal housing. The seal is adjacent the fluid intake and discharge chamber in the seal housing and has a first ring in positive sliding sealing contact with the piston and a second ring compressively positioned between the first ring and the seal housing to urge the first ring against the piston at a right angle to its direction of travel,E. means to reciprocate the piston in the fluid intake and discharge chamber and the seal housing, andF. a valve in communication with the fluid intake and discharge chamber adapted to allow fluid to flow into and/or from the chamber in response to the movement of the piston therein.

Abstract: The invention relates to a cylinder and plunger pump for transferring very small quantities of dosed liquids.The purpose of the invention consists in the realization of relatively small pumps of which the piston need only perform a very small reciprocating movement in order to pump up the liquid, whereby no disturbances may occur.