Oleoweb VMDR Inline Pressure Relief Valve - 40 L/min - 3/8 and 1/2 inch BSPP

The workhorse VMDR body — 40 L/min in 3/8" or 1/2" BSPP — the right size for most group 1 and group 2 gear pump circuits: log splitters, tippers, ag implements and small power units. 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 1 and 2 gear pump circuits — 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. Dead-head slowly against a gauge, wind to target, lock the locknut. Set it to protect the weakest component — on a log splitter or tipper that is usually the pump — typically 10-15% above maximum working pressure. Pick the spring so your setting sits in its middle third; springs drift at the ends of their range. If oil sits over relief for more than a few seconds at a time, fix the circuit — a relief valve is protection, not a flow control, and it makes heat fast at 40 L/min.

Official Datasheet

📄 Oleoweb VMDR40 Factory Datasheet (PDF)

See It Working

Every Size in the VMDR Range

20 L/min - 1/4 inch BSPP90 L/min - 1/2 inch BSPP120 L/min - 3/4 and 1 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.