Oleoweb VMDR Inline Pressure Relief Valve - 20 L/min - 1/4 inch BSPP

The smallest VMDR body — 20 L/min through 1/4" BSPP ports — sized for power packs, small gear pumps, pilot circuits and single-ram machines. 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 power packs and small 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 the circuit slowly against a gauge, wind to target, lock the locknut. On a small power pack the relief is usually protecting the pump itself: set it 10-15% above working pressure and no higher. Springs are most stable mid-range — pick the spring so your setting lands in its middle third. A relief that constantly passes oil is a design problem, not a setting problem: it turns the tank into a kettle.

Official Datasheet

📄 Oleoweb VMDR1 Factory Datasheet (PDF)

See It Working

Every Size in the VMDR Range

40 L/min - 3/8 and 1/2 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.