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Danfoss / Eaton Integrated Hydraulics 4SK904S3

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Description & Features

Vickers by Danfoss / Eaton 4SK90 Series Check Valves are suitable for mobile and industrial applications, including use in harvesters and refuse haulers. These poppet-style check valves offer high operational efficiency with low spring settings.

These Danfoss / Eaton Integrated Hydraulics check valves are rated to 350 bar (5000 psi) and a 90 liter per minute flow rate (227 L/min / 60 USgpm).

SKU: 401AA00019A

Supplier Part Number (MPN): 401AA00019A

Specifications

Actuator Type
Pilot Operated
Cavity
A20092-T2A
Connection Type
UNS
Dimensions
4-1/2 in L x 1-1/4 in W x 1-1/4 in H
Mounting Type
Screw-In
Nominal Size
1 in
Number of Ports/Ways
3-Way
Operator Type
Pilot Operated
Packing Material
Nitrile
Pilot Ratio
4:1
Seal Material
Nitrile
Series
4SK90 Series
Softgoods Material
Nitrile
Style
Poppet

Product Questions & Answers (2)

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Question by: Daryl W on Jan 4, 2026, 6:18 AM
these check valves rated high enough for heavy equipment use, like a commercial harvester runnin all day?
Answer by: Customer Support on Jan 5, 2026, 8:20 PM
At 350 bar (5000 psi) and a flow rate up to 227 liters per minute (60 USgpm), these valves are built for exactly that kind of work. Harvesters are actually one of the listed applications for the 4SK90 series, so you're in solid territory there. The poppet-style design helps keep efficiency up even under sustained demand, and the low spring settings support smooth operation without fighting the system.
Question by: Cindy S on Jul 9, 2025, 11:37 AM
Reckon this check valve can handle continuous use in a hydraulic system?
Answer by: Customer Support on Jul 10, 2025, 2:23 PM
Rated to 350 bar (5000 psi) and a flow rate of 90 liters per minute, this poppet-style check valve is built for efficiency, even with lower spring settings. Just make sure your specific application doesn't exceed those limits.

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