Valve 118181

Williams Controls
Part# 118181
note
Normally closed valve protecting air brake system pressure in commercial vehicles.
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Description

The Williams Controls WM778A Air Brake Pressure Protection Valve (118181) is a normally closed valve designed to safeguard primary air brake systems by automatically closing when pressure falls below a set threshold. It manages air pressure flow between primary and auxiliary systems to maintain system integrity and prevent pressure loss.

Key Specifications

  • Application: Air brake systems, FMVSS121 compliant
  • Function: Protects primary air pressure by automatic valve closure
  • Compatibility: Heavy-duty trucks, commercial vehicles
  • Construction: Metal body, internal sealing components
  • Features: Normally closed at 70 psi, 1/4” NPT ports, max 150 psi, -40°F to 180°F operating range, no inlet filter
  • Quality: OEM Williams Controls part

Shipping Info

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More Information

Current Part# 118181
Part# variations 118181 W1L,
118181W1L,
WIL 118181,
WIL118181
Manufacturer Williams Controls
Warranty Standard Manufactures