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Danfoss / Eaton Integrated Hydraulics 4SK303S

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Description & Features

Rated to 350 bar (5,000 psi) with a flow capacity of 30 litres per minute, this poppet-style check valve is built for reliable performance across demanding mobile and industrial hydraulic circuits. The Danfoss / Eaton Integrated Hydraulics 4SK303S belongs to the Vickers 4SK30 series and is engineered with low spring settings to support high operational efficiency in applications where consistent directional flow control is critical.

Typical applications include harvesters, refuse haulers, and a range of mobile and industrial hydraulic systems. The poppet design provides positive sealing and responsive actuation, making it well suited to environments where reliable check valve performance is required under sustained pressure.

SKU: 401AA00016A

Supplier Part Number (MPN): 401AA00016A

Alternate Part Numbers: 4SK303S

Specifications

Actuator Type
Pilot Operated
Cavity
A20090
Connection Type
Threaded
Dimensions
0.87 in L x 0.87 in W x 2.5 in H
Mounting Type
Screw-In
Number of Ports/Ways
3-Way
Operator Type
Pilot Operated
Pilot Ratio
3:1
Port Type
Cartridge Only
Seal Material
Buna-N
Seat Material
Buna-N
Series
4SK30 Series
Softgoods Material
Buna-N
Style
Poppet

Product Questions & Answers (2)

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Question by: Kent C on Sep 8, 2025, 8:32 PM
What kind of check valve style is this, and does it hold up well under high pressure?
Answer by: Customer Support on Sep 10, 2025, 11:49 AM
Poppet-style construction is what you're getting here, and that matters for sealing. Unlike ball or disc designs, a poppet seats firmly against the port and gives you a positive seal even under sustained pressure. Rated to 350 bar (5,000 psi), this valve is built to hold its own in demanding circuits without bleeding back or losing directional control over time.
Question by: Hank W on Mar 8, 2026, 4:46 PM
Would this check valve be alright for a harvester application?
Answer by: Customer Support on Mar 10, 2026, 6:40 AM
It's definitely suitable; this poppet valve is used in harvesters and refuse haulers, along with other mobile and industrial hydraulic applications.

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