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Pressure Decay-Proof Technology (PDP®)

For over 60 years, Webtec has been designing and manufacturing rotary shear valves trusted in demanding hydraulic applications worldwide. Our unique, registered Pressure Decay Proof (PDP®) technology ensures that the Webtec 180/280 rotary shear valves deliver unmatched reliability and performance.

Conventional sliding spool directional valves operate using a closely fitting spool and bore. To enable the spool to slide freely, there is a small clearance between the outside diameter of the spool and the internal diameter of the bore. This clearance will inevitably allow internal leakage and will also be prone to contamination causing the valve to stick or even jam completely.

PDP® rotary shear valves use a precision-engineered rotary shear design that creates a positive metal-to-metal shut-off. This prevents the pressure loss, or “decay,” that spool valves suffer from, guaranteeing consistent performance even after years of operation and countless duty cycles.

The proven PDP® design resists wear, contamination, and high differential pressures, providing a longer service life and reducing costly downtime. Where spool valves are prone to leakage and contamination related malfunction, PDP® rotary shear valves remain pressure-tight, delivering dependable control and efficiency throughout their lifetime.

For operators, this means safer systems, more predictable performance, and lower maintenance costs. When reliability cannot be compromised, Webtec 180/280 rotary shear valves with PDP® technology are the superior choice—backed by six decades of Webtec expertise and innovation.

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