Sealco Relay Valve 110139

Sealco Relay Valve 110139

Ratio Relay Valve

The Ratio Feature is considered a benefit in hard stop situations. It refers to the relationship between the control air pressure to the valve and the delivered air pressure from the valve to the service brake chambers. During normal stops, a 1:1 ratio exists between the control and delivered air pressures. In a hard stop, the ratio momentarily changes to 1:1.5 until valve lap-off occurs and the 1:1 ratio is restored. This change takes place in less than 1/100th of a second. The preferred application for valves with this feature is controlling tandem axles.

Note: Valves with a ratio feature should not be used on converter dollies, lift axles, or trailer turnable axles!  

Features of the Sealco Relay Valve 110139:

• 3/8″NPT Auxiliary Supply Ports
• 3/8″NPT  Control Port
• 3/4″NPT Reservoir/Air Tank Ports
• J1860 Tag – RD045
• 4.5psi Nominal Crack Pressure