Twin Disc Clutch Quick Release Dump Valve

The Twin Disc Clutch Quick Release Dump Valve is a heavy-duty pneumatic exhaust valve engineered for PO-series air clutches on logging yarders (Madill, Skagit, Thunderbird), heavy-haul winches, and industrial wood chippers. Mounted directly to the clutch assembly, it vents compressed air locally to atmosphere for instant clutch disengagement, eliminating release lag and preventing friction disc drag under heavy operating loads. Features a cast 4-bolt body construction.

Twin Disc Clutch Quick Release Dump Valve | Forestry Yarder Air Valve

Maximize clutch disengagement speed and prevent thermal wear on heavy forestry equipment with the genuine Twin Disc Clutch Quick Release Dump Valve. Engineered specifically for Twin Disc PO-series pneumatic air clutches, this heavy-duty dump valve mounts directly on the clutch airtube or spider assembly to provide localized high-volume air exhaust.

Yarder Winch & PO Clutch Performance

In cable logging operations on steep hillsides, immediate winch drum disengagement is essential for operational control and equipment longevity. Standard control lines running back to the operator cab introduce airflow resistance and lag. The Twin Disc Clutch Dump Valve solves this by venting trapped control air straight to the atmosphere at the clutch, delivering instantaneous release on main, haulback, skyline, and guylinet winch drums across Madill, Skagit, and Thunderbird yarders.

Prevents Clutch Drag & Heat Accumulation

By dumping air pressure immediately upon signal release, this valve prevents friction plate drag, slippage, and rapid lining burnout during continuous cycling. It protects internal airtubes, friction discs, and drive plates from high-heat damage in wood chippers, tub grinders, and heavy yarder winch drums.

Rugged Heavy-Duty Construction

Built with a cast iron/alloy housing featuring the iconic raised TWIN DISC casting mark, this 4-bolt valve assembly is built for high-vibration, high-cycle logging environments. Features precision-machined porting and a direct-mount flange face for leak-free sealing under continuous pressure.

Technical Specifications