Product Description
The Bendix 280809N DC-4 Double Check Valve is a heavy-duty pneumatic component designed to manage compressed air from two separate sources within commercial vehicle air brake systems. The valve automatically directs air from the higher-pressure source into a common delivery circuit while preventing air from flowing backward into the lower-pressure source.
Featuring a durable metal housing and an internal shuttle mechanism, the DC-4 operates automatically in response to changing air pressure. Its compact design and multiple 3/8-inch NPT connections make it suitable for compatible commercial truck and trailer pneumatic systems.
The 280809N is ideal for replacing a damaged, leaking, or malfunctioning double check valve during air brake maintenance and repairs.
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Genuine Bendix DC-4 double check valve
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Manufacturer Part Number: 280809N
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Automatically selects the higher-pressure air source
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Internal shuttle-type valve mechanism
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Two supply connections and two delivery connections
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Supply Port 1: 3/8"-18 NPT male
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Supply Port 2: 3/8"-18 NPT female
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Delivery Port 1: 3/8"-18 NPT female
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Delivery Port 2: 3/8"-18 NPT female
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Operating temperature range: -40°F to 200°F
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Compact construction for pneumatic systems
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Helps prevent reverse airflow between separate air sources
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Designed for heavy-duty commercial vehicle air brake systems
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Cross-references include Haldex KN25110, Meritor R955280809N, and Navistar 422950C91
The double check valve is commonly used where two independently controlled air sources must feed a common circuit. Its automatic operation helps maintain appropriate airflow without requiring electrical controls or manual adjustment.
Before ordering, verify the original valve part number, port sizes, male and female thread configurations, and installation requirements. The DC-4 is available in several configurations that are not universally interchangeable.
