Service Relay Valve
- Used on trailers only to apply and release service brakes.
- This valve includes a Ratio Feature. Do not use on converter dollies, lift axles or trailer turnable 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 then 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 turnable axles!
- Used on trailers only to apply and release service brakes.
- This valve includes a Ratio Feature. Do not use on converter dollies, lift axles or trailer turnable 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 then 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 turnable axles!
| Euclid: | ESL110139 |
| Sealco: | 110139, 110147, SL110139, 110139X |
| Velvac: | 032102, 032103 |
| 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. |