
27
Trailer Spring Brake Valves
Part No.
Supply
Ports
Reservoir
Ports
Delivery
Ports
Service
Ports
Crack
Pressure
Wght.
Core
Class
Core
Grp.
Minor
Maint. Kit
Comments
110147X 2 - 3/8" PT 1 - 3/4" PT 4 - 3/8" PT 2 - 3/8" PT N/A 5 lbs. VT X1 VK1008S
Supply
Supply
Reservoir
Delivery
Delivery
Service
Service
Sealco
110147X
Ratio Relay Valve
4 Port Delivery
Used on 121 trailers to control both park-
ing and emergency brake functions. Also
controls reservoir charging and air pres-
sure retention upon loss of trailer supply
(emergency) line pressure. Automatically
applies emergency (parking) brakes when
trailer supply (emergency) line pressure
is lost (disconnected or break away). Gen-
erally used in a three reservoir system on
tandem axle trailers. Has anti-compound
feature to prevent simultaneous service
and parking applications.
Part No.
Supply
Ports
Reservoir Ports
Delivery
Ports
Control
Ports
Wght.
Core
Class
Core
Grp.
Minor
Maint. Kit
Comments
110170X 1 - 3/8" PT 2 - 1/2" PT -- 4 - 3/8" PT 1 - 3/8" PT 4 lbs. VU X2 VK1009S Cover as shown
110171X 1 - 3/8" PT 1 - 1/2" PT 1 - 3/8" PT 4 - 3/8" PT 1 - 3/8" PT 4 lbs. VU X2 VK1009S Cover rotated 90°
110191X 1 - 3/8" PT 1 - 3/8" PT 1 - 1/2" PT 4 - 3/8" PT 1 - 3/8" PT 4 lbs. VU X2 VK1009S Cover rotated 90°
110310X 1 - 3/8" PT 1 - 3/8" PT 1 - 1/2" PT 4 - 3/8" PT 1 - 3/8" PT 4 lbs. VU X2 VK1009S Cover as shown
110315X 1 - 3/8" PT 1 - 1/2" PT 1 - 3/8" PT 4 - 3/8" PT 1 - 3/8" PT 4 lbs. VU X2 VK1009S Cover as shown
110170X
Shown
Sealco
110170X, 110171X,
110191X, 110310X,
110315X
Ratio Relay Valve
4 Port Delivery
Used on 121 trailers to control both park-
ing and emergency brake functions. Also
controls reservoir charging and air pres-
sure retention upon loss of trailer supply
(emergency) line pressure. Automatically
applies emergency (parking) brakes when
trailer supply (emergency) line pressure
is lost (disconnected or break away). Gen-
erally used in a two reservoir system on
tandem axle trailers. Has anti-compound
feature to prevent simultaneous service
and parking applications.
Control
Cover
Supply
Delivery
Reservoir
Reservoir
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