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SystemStak modular valves

SystemStak is a revolutionary, compact system for sandwich-mounting modular valves between a directional control valve and a standard mounting surface. SystemStak gives you a full range of complementary pressure, flow and check valve functions, while saving space, reducing installation costs and increasing efficiency in hydraulic systems.

SystemStak modular valves
NG 4 to NG 25 (D02 to D08)
Up to 315 bar (4,500 psi)
Up to 340 L/min (90 gal/min)
Eaton Vickers SystemStak valve

Why use SystemStak?

  • Save space and improve design flexibility through a smaller, highly configurable package
  • Reduce installation costs
  • Improve operational efficiency
  • Eliminate external leakage and boost resistance to contamination for improved overall reliability
  • Simplify service and maintenance through easy access

Rugged and reliable

Internal working parts are produced from hardened steel and reside in a continuous-cast ductile (spheroidal graphite) iron body, offering excellent reliability even in high-pressure applications. 

Simple installation, simple maintenance

Bolt-extender kits simplify valve installation by permitting each valve body to be separately and quickly installed and correctly torqued down. The kits also allow the directional valve to be removed for service or replacement without disturbing the stack. Working parts are serviceable without removing valves from the stack.

Business woman in factory using tablet

Design flexibility

Each valve stack can be configured to provide the specific combination of functions required to meet the system’s needs. Available functions include: 

  • Relief
  • Reducing
  • Sequencing
  • Check
  • PO check
  • Throttle
  • Counterbalance


  • Die casting and foundry
  • Machine tooling
  • Marine/offshore
  • Presses
  • Primary metals
  • Plastics
  • Pulp and paper
  • Test equipment and simulation
  • Turbine control (wind, steam, water)
  • Wood processing
  • General industrial machinery

Don’t forget the subplates and bolt kits

To install Eaton industrial valves, you need Eaton subplates and bolt kits. This hardware is engineered especially for Eaton valves and manifolds to give your systems the flat surfaces and stiffness required for a reliable seal.

Let’s work together

Whether you’re designing a new system or retrofitting an existing machine, Eaton’s design and engineering experts and integrator partners are available for consultation and collaboration. We offer system design, analysis, build, and project management services.
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