The SUNTEC J oil pump is for medium capacity oil burners from 400 to 3000kW. It incorporates a pressure regulating valve and is avalaible with or without cut-off function.
The gear set draws oil from the tank through the built-in filter and transfers it to the valve that regulates the oil pressure to the nozzle line. All oil that does not go through the nozzle line will be dumped through the valve back to the return line in two pipe installation or, if it is a one-pipe installation, back to the suction port in the gear-set. In that case, the by-pass plug must be removed from the return port and the return port sealed by steel plug and washer.
Models 1000 & 1001, the valve also has a cut-off function as follows :
– During starting period when the gear-set speed is increasing, all the oil passes through a special flat on the piston, back to the return. Once the speed reaches a certain value and the flow can no longer pass through this flat, then the pressure increases rapidly overcoming the valve spring force and opens the valve.
– During the stop sequence, the gear-set speed slows down and the valve closes when the gear-set capacity is lower than the flat flow.
The cut-on and cut-off speeds depend on the gear-set size and set pressure.
Models 1002 & 1003 have no cut-off function. Cut-off must be provided by an external solenoid valve.
Bleeding in two pipe operation is automatic, but it may be accelerated by loosening the plug in a pressure gauge port.
In one pipe operation, a pressure port must be opened to bleed the system.