The TOP-330VVB is a NOP (Nippon Oil Pump) 3V Series trochoid pump built for circulating heavier, high-viscosity oils rather than standard-viscosity lubricants. Like other trochoid pumps, it works as an internal gear pump: fluid is trapped and carried through the expanding and contracting pockets formed between an inner and outer rotor, giving smooth, continuous discharge with comparatively low noise and wear versus other gear pump designs. The 3V series is specifically suited to fluids in the roughly 46–2,000 mm²/s viscosity range, making it appropriate for thick lubricating oils and gear oils where a standard trochoid pump’s normal 10–500 mm²/s range wouldn’t be sufficient.
The TOP-330V has a theoretical displacement of 39.0 cm³/rev, a maximum discharge pressure of 1.0 MPa, and a maximum speed of 1,800 min?¹, delivering roughly 54–58 L/min at 1,500 min?¹ and up to about 65–67 L/min at its top rated speed, with 1-1/4” Rc threaded inlet and outlet ports. It’s a bare pump rather than a motor-pump unit, so it needs to be paired with a separately supplied motor or drive coupling, and it mounts via an integrated angle plate rather than the angle-flange arrangement used on the “F” variant of this series. The VB in TOP-330VVB indicates a relief valve mounted directly to the pump body to protect it and the circuit from overpressure; the valve’s cracking pressure is set according to the customer’s specification at the time of order, so when sourcing a replacement it’s worth confirming both the exact part number and the relief valve setting to match the original pump.
