- High-Quality Service Relay Valve
- Used on trailers only to apply and release service brakes.
- This valve includes a Ratio Feature. Do not use converter dollies, lift axles or trailer turntable axles! The preferred application is controlling tandem axles.
- Ratio Feature:
The Ratio Feature is considered a benefit in hard stop situations & refers to the relationship between the control air pressure to the valve & the delivered air pressure from the valve to the service brake chambers.
During normal stopping, a 1:1 ratio exists between the control & 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.
Valves with a ratio feature should not be used on converter dollies, lift axles or trailer turntable axles!
Sealco: 110139, 110139X
|Supply Port (1)||: 3/8"|
|Delivery Ports (4)||: 3/8"|
|Control Port (1)||: 3/8"|
|Reservoir Port (1)||: 3/4"|
|Crack Pressure||: 4.5 PSI|
|Approximate Weight||: 3.9 lbs.|
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