Sealco 110139 Service Relay Valve - 4 Delivery Ports with Ratio Feature Part Number: 680-110139

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Special Notes

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Product Description

Manufacturer: Sealco

Condition: New

Ratio Feature

Do not use this valve on converter dollies, trailer turntable axles or lift axles

4 Delivery ports

Auxiliary supply port = 3/8" pipe thread

Control port size = 3/8" pipe thread

Reservoir port size = 3/4" pipe thread

Delivery port size = 3/8" pipe thread

Nominal crack pressure = 4.5 psi

The Ratio Feature is considered a benefit in hard stop situations and 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 stopping, 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 ratio is restored. This change takes place in less than 1/100th of a second.

Cross References: 110139, 680-110139, 110126, ESL110139, 102616, 12343, 12345, A103600, A86477, 55110139, 39540263
A cross reference listing means that this item should be a suitable replacement for the part numbers listed. You should check the description to be sure it will work in your application.