Modulating pump for fuel oil burner, has additional pump for regulating movement of piston based on set point electrical signal, where set point signal is derived from of alternative voltage signal

摘要

The pump (2) has inlet and outlet ports (4, 6) for respectively receiving and distributing liquid e.g. fuel oil. An electromagnetic pump (12) is placed between the ports and comprising a piston (18) for pumping the liquid. An additional pump (28) e.g. gear-type pump, regulates the movement of the piston based on a set point electrical signal. The set point signal is derived from of alternative voltage signal.