SUN HYDRAULICS DFFA-8DN

Sun Hydraulics DFFA-8DN Hydraulic Relief Valve

Description

The DFFA-8DN from Sun Hydraulics is a direct-acting, poppet-type, screw-in hydraulic cartridge relief valve. It is engineered to limit pressure in hydraulic circuits, providing reliable protection for your system components. This valve’s compact, cartridge-style design allows for easy integration into custom manifolds, making it a versatile solution for both mobile and industrial hydraulic systems.

Specifications

• Manufacturer: Sun Hydraulics
• Model: DFFA-8DN
• Type: Direct-Acting Relief Valve
• Cavity: T-8A
• Maximum Flow Rate: 10 gpm (40 L/min)
• Maximum Operating Pressure: 5000 psi (350 bar)
• Seals: Buna-N (standard)

Label Info

• Brand: SUN
• Model: DFFA 8DN

Application

This relief valve is ideal for applications requiring fast response times to pressure spikes, such as in accumulator circuits, hydrostatic transmissions, and load-holding applications where precise pressure control is critical.

Country of Origin

Manufactured in the USA by Sun Hydraulics, a leader in high-performance hydraulic components.

CO2 Impact

Choosing this reused component saves an estimated 0.34 kg of CO2 compared to a new one, contributing to a more sustainable operation.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the function of a direct-acting relief valve like the DFFA-8DN?

A direct-acting relief valve uses a spring to hold a poppet on its seat. When system pressure exceeds the spring force, the poppet lifts, allowing fluid to bypass to the tank, thus limiting system pressure. This design provides a fast response time to pressure changes.

What is the significance of the T-8A cavity specification?

The T-8A designation refers to a standardized cavity geometry defined by Sun Hydraulics. This ensures that any valve designed for a T-8A cavity, like the DFFA-8DN, will fit correctly into a manifold or block machined with the same specifications, ensuring interchangeability.

How do I adjust the pressure setting on this valve?

The DFFA-8DN is a fixed-setting version of the DFFA valve series. The pressure setting is pre-set at the factory and is not field-adjustable. Always verify that the valve’s fixed pressure setting matches your application’s requirements before installation.

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Last Update: Friday, March 13, 2026