142724 ⎘
Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
Sub-classes:WELL SERVICE PUMP SYSTEM AND METHODS
#2Compressor device and compression method
#3Well service pump
#4Device and method for compressing a working medium
#5Metering pump and metering system
#6Reciprocating pump
#7Subsea multipiston pump module and subsea multistage pump
#8Pump capable of dispensing both a large volume and a small volume of colorant
#9Control valve for pouring color paste in both large amount and small amount
#10HYDRAULIC ROTARY MACHINE
#11Hydraulic Drive for Cryogenic Fuel Pump
#12Metering pump and metering system
#13Reciprocating pumps for downhole deliquification systems and pistons for reciprocating pumps
#14Well service pump system
#15Pressure intensifier
#16Water-powered pump for use in irrigation and for other purposes
#17Magnetic Motor
#18Magnetic air car