A pump includes a cylinder having a suction pipe; and inlet section including a housing, a lower threaded section, an upper nut secured to an upper threaded section, and an inlet having a first connector connected to a valve, a second connector having a connection element connected to the valve, a hollow projection opposite to the connection element and provided through the housing, and an axial hole through the hollow projection; a joining section secured to the cylinder and including a hollow first threaded section and a hollow first internally threaded section secured to a second externally threaded section; a manual operation section including a piston rod extending downward from a spring biased handle into the cylinder; an outlet section; and a safety valve. The safety valve releases pressurized air when the pressurized air reaches a pressure of 0.5 kgf/cm.sup.2 at the safety valve.

A pump includes a cylinder having a suction pipe; and inlet section including a housing, a lower threaded section, an upper nut secured to an upper threaded section, and an inlet having a first connector connected to a valve, a second connector having a connection element connected to the valve, a hollow projection opposite to the connection element and provided through the housing, and an axial hole through the hollow projection; a joining section secured to the cylinder and including a hollow first threaded section and a hollow first internally threaded section secured to a second externally threaded section; a manual operation section including a piston rod extending downward from a spring biased handle into the cylinder; an outlet section; and a safety valve. The safety valve releases pressurized air when the pressurized air reaches a pressure of 0.5 kgf/cm.sup.2 at the safety valve.

Automatic electric actuation of the pump of a liquid dispenser apparatus is provided by a stepper motor having a threaded hollow liquid-conducting tube positioned therein and configured such that motor drives the hollow tube up and down in response to supply of a plurality of electrical pulses thereto. A lower end of the hollow tube is constructed to inter-fit with a stem of the pump such that driving the hollow tube up and down creates a pumping action.

A pumping device with suction/injection function for changing fluid. The pumping device including: a barrel; a bottom portion, connected to the barrel; a pumping mechanism, configured to drain fluid out from or inject fluid into the barrel; and at least one wheel, connected to the bottom portion so that the pumping device is easy to move. Whereby, the pumping device can be moved easily.

A pumping device with suction/injection function for changing fluid. The pumping device including: a barrel; a bottom portion, connected to the barrel; a pumping mechanism, configured to drain fluid out from or inject fluid into the barrel; and at least one wheel, connected to the bottom portion so that the pumping device is easy to move. Whereby, the pumping device can be moved easily.

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 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 peristaltic pump for pumping, controlling flow, and siphoning fluid. The pump draws fluid through a tube by using rollers and releases pressure from the tube to form a siphon by opening a bypass door. A rotatable cap provides strength, the ability to rapidly change tubing, as well as locking the bypass door in place for various modes of operation.

A fluid displacement and pressurizing device which includes a housing, a first piston in the housing, a plunger which extends from the housing and has a second piston thereon, and an actuator that works to selectively lock the piston to either the housing or the plunger depending on the position of the second piston in the housing. Effectively, the actuator includes a first locking mechanism that locks and unlocks the first piston relative to the housing and a second locking mechanism that locks and unlocks the plunger relative to the piston. As such, the first locking mechanism is not only a locking mechanism but is also an actuating mechanism with regard to actuating the second locking mechanism.

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.