Oleoweb VMDR Inline Pressure Relief Valve - 120 L/min - 3/4 and 1 inch BSPP

The big VMDR body — 120 L/min in 3/4" or 1" BSPP — protects group 3 gear pump circuits, orbital motor drives and truck hydraulics. Direct acting, adjustable across the spring range, Italian made.

Use the dropdowns above to pick your port size and pressure spring — choose the spring so your working pressure lands in the middle of its range, not at either end.

Sizes and Part Numbers

How to Choose

1. Flow first: this body suits group 3 pumps, orbital motor drives and truck hydraulics — need more or less? The size ladder below has every VMDR body.
2. Pick the spring so your setting sits mid-range — springs are most stable in the middle third.
3. Ports are BSPP (parallel): seal on the face with a bonded washer, never tape alone.

Technicians Advice

Set it with a gauge, never by feel — and respect the energy: 120 L/min over relief at 250 bar is 50 kW turned straight into heat. Keep the relief teed close to the pump, full-bore, and set 10-15% above working pressure with the setting in the spring's middle third. On motor circuits remember an inline relief protects the supply side only — a spinning load driving the motor needs a crossline relief between the work lines as well.

Official Datasheet

📄 Oleoweb VMDR120 Factory Datasheet (PDF)

See It Working

Every Size in the VMDR Range

20 L/min - 1/4 inch BSPP40 L/min - 3/8 and 1/2 inch BSPP90 L/min - 1/2 inch BSPP

Related

⭐ Crossline Reliefs for MotorsOrbital MotorsGear Motors

Not sure? Call 1300 146 737 or email sales@mhfgc.com.au — we speak fluent hydraulics.

Typical applications: System over-pressure protection for gear pumps, power packs and log splitters. Protecting a hydraulic motor circuit? See our crossline relief valves.