Williams WM-513-A Quick Release Valve | Forestry Yarder & Air Brake Valve
The Williams WM-513-A Quick Release Valve (119136) is a high-capacity pneumatic exhaust valve engineered for rapid air evacuation in logging yarder drum brakes, winch actuators, and commercial air brake systems. Designed to exhaust compressed air directly at the actuator, the WM-513-A eliminates release lag, prevents clutch or brake drag, and delivers instantaneous disengagement on forestry yarders (Madill, Skagit, Thunderbird) and heavy machinery undercarriages. Features a durable die-cast aluminum body with an integrated 2-bolt mounting flange.
Williams WM-513-A Quick Release Valve | Forestry Yarder & Air Brake Valve
Accelerate pneumatic reaction time and safeguard heavy drive components with the genuine Williams Controls WM-513-A Quick Release Valve. Engineered for demanding forestry yarder winches, cable logging rigs, and heavy-duty transport vehicles, this high-flow valve dumps working air locally rather than forcing it back through long control lines.
Yarder Winch & Drum Actuator Control
In high-cycle cable logging operations, instant drum brake and clutch disengagement is critical to preventing line friction, cable snapped-line hazards, and thermal wear. The Williams Controls WM-513-A mounts directly adjacent to winch drum brake actuators and air clutches. When supply pressure drops, the internal diaphragm immediately shifts to vent air straight to the atmosphere, delivering fast, positive brake release on main, haulback, and skyline drums.
Heavy Equipment Air Brake Efficiency
On logging transport carriers and heavy equipment undercarriages, the WM-513-A serves as a fast-acting air brake release valve. By speeding up air exhaust directly at the brake chambers, it reduces lag, prevents pad dragging, and maintains precise control on steep, unpaved haul roads.
Rugged Industrial Construction
Manufactured with a precision die-cast aluminum housing and an oil-resistant internal diaphragm, the WM-513-A operates dependably under high-vibration conditions, moisture exposure, and temperature extremes common to harsh logging environments.
Technical Specifications
| Feature | Specification |
| Manufacturer | Williams Controls (Parker Hannifin) |
| Model / Part Number | WM-513-A (119136, WM513A) |
| Valve Type | Quick Release Valve (Pneumatic Fast Exhaust) |
| Primary Applications | Logging Yarders (Main, Haulback & Skyline Drum Brakes/Clutches), Air Brakes |
| Inlet Port | 1/2″ NPT |
| Outlet / Delivery Ports | (2) 3/8″ NPT |
| Nominal Crack Pressure | ~1.0 PSI |
| Max Operating Pressure | 150 PSI (10.3 Bar) |
| Operating Temperature | -40°F to 180°F (-40°C to 82°C) |
| Body Material | Heavy-Duty Cast Aluminum Alloy |
| Mounting Style | Integrated 2-Bolt Flange Base Mount |
| Equipment Compatibility | Madill, Skagit, Thunderbird, Washington Iron Works, Pacific, Heavy Equipment |
