A pump with an outer housing defining an enclosure, an inlet for admitting fluid into the outer housing and an outlet for expelling fluid from the outer housing, a piston for selectively modulating a first fluid pressure, such that the first fluid pressure is associated with a location proximate the inlet, and a member that selectively isolates a second pressure associated with a location proximate the outlet from the first fluid pressure. The pump may also include a first chamber within the outer housing for receiving fluid admitted into the pump from an ambient environment and through an inlet to the pump, a second chamber within the outer housing for receiving fluid from the first chamber, and a piston that both (i) selectively controls the flow of fluid from the first chamber to the second chamber and (ii) selectively expels the fluid from the second chamber into the ambient environment.

A sand anchor includes a shank and a plunger. The plunger can be inserted into a first end of the shank. The plunger includes an extension, an annular fitting, and an interior seal. The extension is formed with a hollow center. The annular fitting is positioned between an outer surface of the extension and an inner surface of the shank. The interior seal is positioned within the hollow center of the extension and configured to provide a one-way seal.

An improved hand pump for recreational and utilitarian activities, comprising a stainless steel construction for corrosion resistance, a handle with a PVC grip, a piston assembly having a vertically positionable x-ring seal, to allow and prevent fluid flow through the hand pump, a removable top plate for ease of maintenance, bearings and bushings at rotation points in the hand pump for ease of movement of a handle and a piston assembly of the hand pump and increased longevity of the hand pumps, and a stop limiting movement of the pump handle during operation.

An improved hand pump for recreational and utilitarian activities, comprising a stainless steel construction for corrosion resistance, a handle with a PVC grip, a piston assembly having a vertically positionable x-ring seal, to allow and prevent fluid flow through the hand pump, a removable top plate for ease of maintenance, bearings and bushings at rotation points in the hand pump for ease of movement of a handle and a piston assembly of the hand pump and increased longevity of the hand pumps, and a stop limiting movement of the pump handle during operation.

A built-in water pumping device of a manual paddle for a boat contains: a shaft, a blade, and a water absorption head. The shaft includes an inner tube and an outer tube movably fitted with the inner tube so as to movably adjust a length of the shaft, thus pumping waters. An adjustable fitting sleeve is configured to lock or unlock the inner tube and the outer tube after adjusting the length of the shaft. The shaft includes a receiving chamber. A water absorption head is fixed on the outer tube and has a passing orifice. The blade includes at least one outlet communicating with the receiving chamber, such that the inner tube is actuated to absorb the waters into the receiving chamber from the passing orifice, and the inner tube is pulled back and forth so that the waters discharge out of the at least one outlet continuously.

A built-in water pumping device of a manual paddle for a boat contains: a shaft, a blade, and a water absorption head. The shaft includes an inner tube and an outer tube movably fitted with the inner tube so as to movably adjust a length of the shaft, thus pumping waters. An adjustable fitting sleeve is configured to lock or unlock the inner tube and the outer tube after adjusting the length of the shaft. The shaft includes a receiving chamber. A water absorption head is fixed on the outer tube and has a passing orifice. The blade includes at least one outlet communicating with the receiving chamber, such that the inner tube is actuated to absorb the waters into the receiving chamber from the passing orifice, and the inner tube is pulled back and forth so that the waters discharge out of the at least one outlet continuously.

A cartridge hand pump is disclosed. The cartridge hand pump comprises a housing; a lever extending from the housing; a cylinder provided in the housing wherein the cylinder is connected to a supply passage for receiving hydraulic fluid and to an actuator passage for sending pressurised hydraulic fluid; and a piston slidably positioned in the cylinder, the piston being operably connected to the lever for movement between a first position and a second position wherein the movement of the piston from the first to the second position sends pressurised fluid to the actuator passage characterised by a pressure relief valve accommodated in the housing wherein the pressure relief valve is in communication with the actuator passage such that pressurised hydraulic fluid is discharged through the pressure relief valve when pressure in the actuator passage exceeds a predetermined value.

A cartridge hand pump is disclosed. The cartridge hand pump comprises a housing; a lever extending from the housing; a cylinder provided in the housing wherein the cylinder is connected to a supply passage for receiving hydraulic fluid and to an actuator passage for sending pressurised hydraulic fluid; and a piston slidably positioned in the cylinder, the piston being operably connected to the lever for movement between a first position and a second position wherein the movement of the piston from the first to the second position sends pressurised fluid to the actuator passage characterised by a pressure relief valve accommodated in the housing wherein the pressure relief valve is in communication with the actuator passage such that pressurised hydraulic fluid is discharged through the pressure relief valve when pressure in the actuator passage exceeds a predetermined value.

A method for assembling a fluid product dispensing pump, including providing a piston (1) secured to an actuation rod (2); a pump body (3) having a pump chamber (5); a sleeve (50), an outlet valve element (39) an inlet valve element (10) which slides in a sleeve (9) of the pump body having a reduced diameter; and a spring (20). The method includes fixing the outlet valve element in the piston; inserting the piston and the outlet valve element into the sleeve; inserting from the top the spring and the inlet valve element into said sleeve; and inserting from the top the sleeve into the pump body.

A muscle-powered pulsation device for cardiac support including a muscle energy converter device including a piston arrangement for directing fluid out of an outlet of the muscle energy converter device using energy provided by a patient's muscle, and a hydraulic volume amplification device fluidly connected to the muscle energy converter device. The volume amplification device includes a casing including an inlet and an outlet, the inlet in fluid communication with the outlet of the muscle energy converter device, at least one resilient member positioned within an interior cavity defined by the casing, and at least one piston member movably and sealingly positioned within the interior cavity of the casing and operatively connected to the at least one resilient member, the at least one piston member separating the interior cavity into a first chamber and a second chamber.