Abstract: A pair of pumps which are joined by a flexible connection passing over spaced rotatable devices positioned for rotation in a substantially vertical plane. The rotatable devices are driven alternately in clockwise and counterclockwise directions whereby the lifting of one pump occurs as the other pump is lowered. To facilitate the pumping operation, a counterweight is operatively associated with the flexible connection intermediate the pair of rotatable devices.

Abstract: A method and apparatus are shown for use in mixing agricultural chemicals for placement through an applicator onto the soil. A fumigant is added to anhydrous ammonia in measured amounts as the ammonia is being injected in the field from the applicator under pressure. The liquid fumigant, which is quite corrosive to some of the aluminum valves and fittings ordinarily used with anhydrous ammonia, is pumped under pressure to be mixed with the ammonia downstream from the aluminum valves and fittings that might be damaged thereby and upstream from the applicator so that a solution or homogeneous mixture of the anhydrous ammonia and fumigant can be delivered to the ground without damage to any equipment because of the corrosive characteristic of the fumigant.

Abstract: Pumping apparatus which incorporates connected piston type positive displacement, slip free pumps is disclosed. They provide pumped outputs at a common displacement rate. They run out of phase to one another so that while one is pumping, the other is able to refill. A three way valve under control of a pressure responsive switch delivers pumped fluid to the down stream outlet when a pressure match is achieved. The apparatus finds application as a constant rate continuous fluid injection pump.

Abstract: The invention involves an improved design for a diaphragm pump. The inlet and outlet valves for the pump have guided stems that prevent the valves from misaligning and jamming during operation. The stems extend away from each other enabling the valve heads to be moved close to each other so that the pump bowl can be made relatively short. The pump diaphragms include rim portions that cover and protect the members securing it in the pump. The stroke of the pump is adjustable by an arrangement that can vary the size of the stroke while keeping the suction and discharge portions of the stroke equal.

Abstract: A positive displacement pump for forcing semi-fluid materials and especially concrete into a delivery pipe for transmission to a remote location, comprising a pair of parallel pump cylinders having mouths opening to a feed chamber in which a swivel valve having an S-shaped lengthwise extending material conducting passage is mounted for oscillation about a fixed axis that is equispaced from and parallel with the axes of the pump cylinders, alternately between two defined positions in each of which the mouth of one of the pump cylinders is uncovered to enable material in the feed chamber to be inducted into that cylinder by retraction of its piston and the other cylinder is communicated with the delivery pipe by means of the material conducting passage of the valve, the pump being characterized by the fact that the loads imposed on the swivel valve by the force of the discharging pump cylinder are transmitted to and carried by the bottom wall of the feed chamber by virtue of the fact that the bottom outer surfa

Abstract: A hand-operated hydraulic pump utilized to lift or trim an outboard marine engine. A wobble-action handle connects with a pinion gear which in turn drives a rack on a double-ended piston forming two cylinder chambers on opposite ends thereof. Reciprocal movement of the piston alternately pumps fluid from each cylinder chamber both of which are supplied by a common longitudinal passage in the piston across a pair of check valves located at each end of the piston. The pump housing includes the reservoir, discharge port and needle valve for relieving fluid from the discharge port back to the reservoir.

Abstract: A self-aligning reciprocating plunger pump particularly suitable for use in a water jet loom which makes use of a water jet for the purpose of picking a weft into warp openings. The pump is provided in its casing with a push rod slidably mounted in a guide hole formed in the casing and driven by a cam. The push rod is abutted through a spherical surface member provided on a plunger slidably mounted in a cylinder against the plunger.A main valve box connected to a discharge opening provided in a cover casing is arranged adjacent to a control valve box connected to a water jet device which is fastened to the main valve box by bolts.

Abstract: Displacement slurry pump equipped with known piston-rod drive, in which on a piston rod expediently three pistons are arranged at a distance of at least one stroke length, they are a liquid piston moving the auxiliary liquid free of solid matter, and on both sides thereof a slurry piston each moving on one side the slurry, on the other side, however, the auxiliary liquid. The liquid piston fits sealed to the liquid cylinder provided with liquid suction valves, whereas the two slurry pistons fit by slot to the slurry cylinders provided with slurry suction valves and slurry delivery valves. The effective section of the liquid cylinder is larger than the effective section of a slurry cylinder each. The slurry pump may be of single-operation or of double-operation, of one-cylinder or two-cylinder or three-cylinder construction.

Abstract: A multi-plunger reciprocating pump comprising a generally horizontally extending crankshaft and a plurality of generally horizontally extending cylinders alternately disposed at least generally above and below the centerline of the crankshaft. An oil pan is detachably mounted in the crankshaft housing below the crankshaft, whereby the oil pan is readily removable to facilitate axial removal of the crankshaft; and the crossheads connecting the crankshaft driven connecting rods to the piston rods are slidably mounted by bearing shoes adapted to be rotated 90.degree. for facilitating access thereto. Also, the suction and discharge valves for the cylinders are readily accessible without disconnection of any of the piping or manifolds of the pump.

Abstract: An air compressor cylinder head is disclosed in which a compressed air jacket surrounds a coolant-receiving cavity instead of the coolant surrounding the air jacket as in the prior art. This arrangement permits the compressed air to be cooled by heat transfer both to the ambient air and to the coolant in the coolant cavity, instead of to the coolant alone, as in the prior art.

Abstract: A double-eccentric variable drive system is disclosed comprising a drive shaft, two eccentrics mounted on the drive shaft to be driven thereby, and means for varying the eccentricity of both of the eccentrics simultaneously. The means in question comprises a spindle having left-hand screw-threads on one end thereof and right-hand screw-threads on the other end thereof and an enlarged central portion rotatably mounted in the shaft but radially fixed relative thereto. The eccentrics each have a radial bore therethrough tapped to correspond with and receive the threads of the spindle, the bores being aligned on opposite sides of the shaft. Each eccentric has an axial bore larger than the diameter of the shaft in a direction parallel to the spindle to allow for movement of the eccentrics radially of the shaft.

Abstract: A unitary inlet and outlet valve means for fluid flow control comprising a unitary body in the form of a hollow sleeve having coaxially arranged inlet and outlet valves. The sleeve housing means includes an inlet at one end thereof, and a flow chamber at the opposed end thereof, and with an annular flange extending outwardly from the sleeve adjacent the flow chamber. The central bore through the sleeve member provides a housing and seat for the inlet poppet, and an annular spring-biased ring controls fluid flow through bores formed in the flange and communicating between the flange and the flow chamber. The individual valves open upon opposed inwardly directed movement, thereby shortening the overall length of the valve body.

Abstract: An expansible chamber device with offset pistons and a crankshaft having crankpins asymmetrically angularly spaced about its axis of rotation to provide symmetrically spaced peaks in the total torque at the crankshaft throughout each complete revolution thereof.

Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed in each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.

Abstract: A single acting dual piston positive displacement pump with alternating piston motion. A pump suitable for manual operation and operable at relatively high pressure such as 400 to 800 psig. A pump suitable for pumping corrosive liquids with the drive mechanism separated from the liquid lines. A pump housing with cylinder section and abutting manifold section, with the alternating reciprocating pistons in the cylinder section and the inlet and outlet openings in the manifold section, with the pistons projecting from the cylinder section opposite the inlet and outlet openings for connection to the piston drive mechanism.

Abstract: A system is provided for maintaining a permanent reciprocatory movement of a mechanical arrangement, particularly a pump unit. A main driving wheel is coupled to the mechanical arrangement and fastened on the shaft of a hydraulic motor which is supplied by a variable delivery pump provided with control means. The control means is coupled to the wheel by a drive mechanism which comprises a rocking lever coupled to the control means and a cam carrier wheel rotationally fixed to the wheel. As the mechanical arrangement moves in one direction, the rotation of the driving wheel causes the cam wheel to change the position of the rocking lever thus permitting the control means to direct the flow of fluid from the variable delivery pump to the hydraulic motor to reverse the direction of travel of the mechanical arrangement.

Abstract: A metering pulse pump for metering an additive liquid into a liquid carrier under high pressure. A high-pressure, rapidly reciprocating piston pump is provided at its outlet end with a pressure-relief valve including a spring pressure control permitting the valve to open under varying pre-set pressure differentials across the valve. A diaphragm pump having first and second chambers separated by a diaphragm is provided with one of the chambers communicating directly with the outlet of the piston pump upstream of the pressure-relief valve, liquid carrier emitted under pressure from the piston pump serving to drive the diaphragm pump in a pumping stroke, the second chamber of the diaphragm pump having inflow and outflow ports with respective check valves permitting only inflow and outflow of an additive liquid into and out of the second chamber.