Suntec AT Pumps
The Suntec AT Series of pump are a light oil pump designed for use on a 1 or 2 pipe system. Suntec AT pumps incorporate two adjustable pressure ranges with a single nozzle outlet. They also feature a single in line cut-off solenoid.
Switching between low and high pressure is assured by a "normally open" by-pass solenoid valve. When this solenoid is non-activated, a by-pass channel is open, allowing the normal functioning of the low pressure regulating valve which sets the nozzle pressure. When this solenoid is activated, the by-pass channel is closed, thus pressure will build up on both sides of the low pressure regulating valve eliminating its effect, and the high pressure regulating valve now determines the nozzle pressure. The blocking solenoid valve of the nozzle line is of the "normally closed" type.
This design ensures extremely fast response and the switching can be selected according to the burner operating sequence and is independent of motor speed. When this solenoid valve is non-activated, the valve is closed and all oil pressurised by the gear set passes through the regulators to the suction or to the return line, depending upon pipe arrangement. As soon as this solenoid is activated, oil passes to the nozzle line at the pressure set by the pressure regulating valves. In two pipe operation, the by-pass plug must be fitted in the return port, which ensures that the oil dumped by the regulating valves is returned to the tank and the suction line flow is equal to the gear set capacity. The two solenoid valves can be operated independently.
Rotation of these pumps is determined by viewing the pump from the shaft end.
If the Part number has a K at the end, it is suitable for use with Kerosene.
If the Part Number has a V in, it is fitted with Viton Seals.