A pump assembly. The pump assembly may comprise a motor portion for driving a fluid pumping portion via a piston. The motor portion may comprise: a spool and a spool housing assembly having a spool chamber. The spool may be disposed within the spool chamber. The spool may comprise an upper portion and a lower portion, wherein the diameter of the lower portion is larger than the diameter of the upper portion. The spool may also comprise: (1) two support groove portions for cradling two slide valves and (2) two spool bores, which are in fluid communication with the two slide valves. The piston of the pump assembly may comprise a valve stem having a valve stem bore and valve stem openings. The valve stem openings may be funnel-shaped or may inwardly slope into the valve stem bore to prevent or minimize cutting or shredding of a blown seal.

A pump assembly includes a pump module configured to be supported by a fluid tank and a drive module configured to be supported by the pump module. The drive module is mountable to and dismountable from the pump module. The drive module provides a motive force to the pump module to power pumping by the pump module.

A pump assembly includes a pump module configured to be supported by a fluid tank and a drive module configured to be supported by the pump module. The drive module is mountable to and dismountable from the pump module. The drive module provides a motive force to the pump module to power pumping by the pump module.

A viscous fluid is dispensed precisely using a fluid pump, control valves configured to control both the air inlet and outlet of the fluid pump, an optional adjustable regulator further controlling the air outlet, and a control circuit that opens and closes the control valves. To further increase the precision, additional control valves can be used to control liquid inlet and outlet of the fluid pump.

An oil change machine or apparatus for removing used oil from an engine has flow lines for removing oil directly from the engine, which can be an automobile engine or a boat engine. The oil change machine can be configured to empty used oil to a designated waste oil bin. The oil change apparatus or machine can be located at a shop, can be portable and maneuverable from locations to locations, or be mounted on a service vehicle for on-site use, such as to perform oil change away from an oil lube center. The oil change machine can have adaptors for use with various engine models and can include an onboard offloading tank, in addition to a service holding tank, for performing multiple oil changes.

An oil change machine or apparatus for removing used oil from an engine has flow lines for removing oil directly from the engine, which can be an automobile engine or a boat engine. The oil change machine can be configured to empty used oil to a designated waste oil bin. The oil change apparatus or machine can be located at a shop, can be portable and maneuverable from locations to locations, or be mounted on a service vehicle for on-site use, such as to perform oil change away from an oil lube center. The oil change machine can have adaptors for use with various engine models and can include an onboard offloading tank, in addition to a service holding tank, for performing multiple oil changes.

The invention relates to a combination metering assembly for filling liquid products into containers. The invention is characterised by a base unit (1) and pump components (3, 4, 5, 6, 11, 12, 13, 14) of at least two different pump types for a metering operation, wherein the pump components of each pump type can be combined with the base unit in order to form a pump system of the corresponding pump type, and the base unit has connection means (19, 23) for this purpose which are compatible with the connections of the pump components. The combination metering assembly can be adapted to different metering situations with little complexity and has a comparably small space requirement.

A method for chemical treatment includes operating a chemical pump having a flow rate capacity of a selected multiple of a flow rate of a chemical required to treat at least one of a well and surface equipment associated therewith. The operating is performed at at least one selected time and for at least one selected duration inversely proportional to the flow rate capacity such that a volume of the chemical pumped in a predetermined time interval substantially equals a required volume of the chemical during the predetermined time interval.

A method for chemical treatment includes operating a chemical pump having a flow rate capacity of a selected multiple of a flow rate of a chemical required to treat at least one of a well and surface equipment associated therewith. The operating is performed at at least one selected time and for at least one selected duration inversely proportional to the flow rate capacity such that a volume of the chemical pumped in a predetermined time interval substantially equals a required volume of the chemical during the predetermined time interval.

A sterile liquid pump, having replaceable single use components, with a first and second chamber, and a gas valve assembly to selectively communicate gas pressure and vacuum with the chambers, and a resilient tubing liquid manifold loop with a sequence of four ports located within a manifold receiver that supports four pinch actuators aligned to engage and selectively pinch-off flow through the manifold between adjacent pairs ports, and, a controller that operates the valve assembly to alternatingly couple pressure and vacuum to the pump chambers, and that also operates to alternatingly actuate pairs of the pinch actuators to sequentially pump fluid from pump chambers under gas pressure, and through an opposing pair of ports in the resilient tubing manifold.