A liquid transfer assembly includes a housing that has a supply port, a return port and a fill port each extending into an interior of the housing. A shut off valve is movably integrated into the housing and the shut off valve is movable between a first condition and a second condition. A trigger is movably integrated into the grip and the trigger is in communication with the shut off valve. The shut off valve is actuated into the second condition when the trigger is depressed. An inertial pump is movably disposed within the housing and the inertial pump is charged with a handle to pump a fluid in a first container into the second container when the trigger is depressed. A priming pump is integrated into the housing for priming the inertial pump when the priming pump is manipulated.

A driven gas-liquid separation starting device, a gas-liquid chamber is communicated with a pump channel, a rotation mechanism is arranged in the gas-liquid chamber; a second cam mechanism is arranged in a primary gas-liquid separation chamber, which is divided by a baffle and the second cam mechanism into primary gas-liquid separation units, spiral gas-liquid separation mechanisms in contact with the second cam mechanism are arranged the primary gas-liquid separation unit; a first cam mechanism is arranged in a self-priming chamber, a secondary gas-liquid separation chamber is in contact with a rolling pair through a supporting connecting rod, a volume of the secondary gas-liquid separation chamber is changed by rotation of the first cam mechanism, to carry out further gas-liquid separation on a mixed gas-liquid fluid with a high gas content obtained through separation in the primary gas-liquid separation chamber; an exhaust chamber is arranged on the self-priming chamber.

A pump assembly includes a centrifugal pump having an intake, a discharge, a pump chamber and an impeller to deliver water from the intake to the discharge. A priming system is fluidly coupled to the pump chamber. A drive assembly includes a drive shaft coupled to the priming system and positioned around an impeller shaft coupled to the impeller for selective rotatable coupling of the impeller shaft and the drive shaft.

Priming systems and infusion assemblies are provided. For example, a priming system comprises a priming conduit having a priming portion and a pressure portion. The priming portion is in fluid communication with a first fluid source, with an inlet and an outlet for ingress and egress of a first fluid from the first fluid source. The pressure portion is in fluid communication with a second fluid source connected by a connector. Disposed within the priming conduit are a biasing member and a valve having an open position and a closed position. The biasing member is in operable communication with the valve to urge the valve into the closed position such that the valve defaults to the closed position. The open position allows the first fluid to flow from the inlet to the outlet and the closed position prevents the first fluid from flowing from the inlet to the outlet.

Systems and methods described herein provide a vacuum priming system for close-coupled pumps. The vacuum priming system is mounted separately from a centrifugal pump and powered by an electric motor. An auxiliary vacuum pump pulls prime (e.g., water or another liquid) through a solenoid valve that is in turn connected to a connecting tube. At one end of the connecting tube is a screen and prime sensor. The screen filters particulates to protect the vacuum pump, and the prime sensor may detect when the centrifugal pump is primed. The vacuum priming system includes a self-contained control panel with an auto operation mode to only pull power during priming, reducing power consumption over the lifetime of the pump system and improving efficiency.