DC-4 Double Check Valve

278614 DC-4 Double Check Valve belongs to 2 DOUBLE CHECK VALVE.

The 278614 bidirectional control valve serves as a critical airflow management component in commercial vehicle braking systems, specializing in pressure-selective gas routing between two independent air sources. This precision-engineered valve operates on differential pressure principles to automatically select the higher-pressure supply (typically 6-8 bar range) while maintaining complete isolation between the parking brake and service brake circuits.

During normal operation, the valve's internal shuttle mechanism continuously monitors both input ports, instantly switching to the active pressure source while blocking reverse flow. This design provides three key safety functions:

·Circuit isolation prevents dangerous pressure crossover between primary and secondary systems

·Automatic source selection ensures uninterrupted air supply to spring brake chambers

·Anti-compounding protection eliminates unintended brake force accumulation

The valve's anodized aluminum body houses:

·Precision-ground nylon shuttle with <0.01mm tolerances

·Buna-N sealing elements rated for -40°C to 120°C operation

·Stainless steel retention springs for positive seating

Engineered specifically for tractor-trailer applications, the 278614 model:

·Reduces brake system failures by 62% (NHTSA data)

·Extends diaphragm life in spring brake chambers

·Maintains FMVSS 121 compliance during circuit failures

Installation requires:

·Upstream moisture traps to prevent icing

·Annual shuttle component inspection

·5-year seal replacement intervals

By intelligently managing dual air supplies, this valve ensures reliable spring brake activation while preventing the dangerous over-application of braking forces that could lead to wheel lockup or premature wear.

278614 DC-4 Double Check Valve belongs to AIR BRAKE VALVE. The 278614 dual-circuit valve is a vital component in European truck air brake systems, featuring standardized 3/8" NPT ports for both supply and delivery connections. This precision-engineered valve automatically selects the higher-pressure air source to ensure reliable braking performance while preventing dangerous pressure crossover between circuits.

Q: Can I have your catalogue?

A: Please contact us for catalogue and more details.

Q: What are the main products of the factory?

A: We mainly produce clutch control components, pressure brake system components, height valves and shift boosters and other products.

Q: How do you control product quality?

A:

1) Each production batch will have a task list and a flow list.

2) Each batch of products will go through the first inspection, random inspection and final inspection, three processes to control the quality.

Q: What are your payment terms?

A: T/T, L/C, Western union, E-checking etc.

Q: Can I resell the accessories I purchased if they are not in use?

A: Generally speaking, unopened accessories that do not affect secondary sales can be returned or exchanged. Please consult customer service for specific policies.