Oleoweb VMDR Inline Pressure Relief Valve - 90 L/min - 1/2 inch BSPP

The mid-size VMDR — 90 L/min through 1/2" BSPP — covers larger group 2 and group 3 gear pump circuits without stepping up to 3/4" plumbing. Direct acting, adjustable across the spring range, Italian made.

Use the dropdowns above to pick your 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 larger group 2 and group 3 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 — and at 90 L/min, mind the plumbing: a relief valve is only as good as the line feeding it, so keep the tee close to the pump and full-bore. Set 10-15% above working pressure, spring setting in the middle third of its range, locknut done up. Relieving 90 L/min at 200 bar dumps about 30 kW into the oil — if the valve is working often, the circuit needs a redesign before the tank boils.

Official Datasheet

📄 Oleoweb VMDR90 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 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.