VOITHIPV 3-8Fixed Displacement Internal Gear Pump, 8.2 cc/rev, 330 bar Continuous, 400-3600 rpm, SAE Code 61 Ports

Product Description

What this part is

A high-pressure internal gear pump (Innenzahnradpumpe) from the Voith IPV series, built for constant-speed drive applications – typically a 4-pole asynchronous motor running a power unit where flow is controlled by valves rather than by varying pump displacement.

Decoding IPV 3-8

IPV – Voith internal gear pump, fixed displacement, high-pressure series.3 – frame size 3, the smallest of the IPV frames (sizes run 3, 4, 5, 6, 7).8 – displacement class within frame 3, nominally 8 cm3/rev; the catalogue figure is 8.2 cm3/rev. Sister sizes in frame 3 are 3.5, 5, 6.3, 8 and 10.The listing also appears written as IPV 3 – 8, IPV3/8 and IPV /3-/8. All refer to the same pump.

Published performance (Voith IPV catalogue)

Displacement: 8.2 cm3 per revolutionDelivery at 1500 rpm: 12.3 l/min (approx. 3.25 US gpm)Speed range: 400 rpm minimum to 3600 rpm maximumContinuous pressure: 330 bar (approx. 4785 psi)Peak pressure at 1500 rpm: 345 bar; peak pressure at n-max: 345 barInlet (charge) pressure: 0.6 to 3 bar absoluteFluid: HLP mineral oil to DIN 51524 part 2 or 3Viscosity range: 10 to 100 mm2/s (cSt); permissible start viscosity max. 2000 mm2/sPorts: SAE suction and pressure flanges to J518C Code 61Mounting position: anyRotation: available right-hand or left-hand – confirm direction against the unit before ordering, it is not field-reversibleCatalogue mass for the 3-8: approximately 4.6 kg (one printing of the same table lists 4.8 kg)

Why the internal gear design matters here

An internal gear pump runs quieter and with less flow ripple than an external gear pump at the same pressure, because the meshing geometry gives a longer, gradual sealing line instead of an abrupt tooth-by-tooth handover. That is why IPV pumps show up on injection moulding machines, presses, test rigs and machine tools where 300-plus bar is needed but noise at the operator station is a specification. The trade-off is the fixed displacement: flow is set by shaft speed alone, so any flow control has to be done with valves, and the wasted energy shows up as heat in the tank. If the application needs load-sensing or energy savings, a variable-displacement pump is the right answer, not this one.

Frame-size and pressure trade-off

Frame 3 holds full 330 bar continuous rating across every displacement in the frame. That is not true further up the range – the larger frames de-rate as displacement grows (for example IPV 4-32 drops to 250 bar continuous). So a frame 3 pump gives you the full pressure capability of the series in the smallest envelope, at the cost of low flow.

Interchange and successor guidance

The IPVS series is Voith’s higher-pressure development of the same envelope family, rated up to 420 bar peak; IPVS is the part to look at if the circuit has been uprated. Within IPV, moving between 3-6.3, 3-8 and 3-10 changes only the displacement and one port flange size, so a substitution is normally a flow-and-plumbing question rather than a mounting question. The line is Voith Turbo H + L Hydraulic; Voith publishes no radial and axial shaft load figures in the catalogue and directs users to their representative, so shaft loading is not stated here.

Condition

Used, made in Germany. Quantity 1. No shaft or port dimensions are quoted beyond what Voith publishes; measure the unit if a drop-in fit is critical.