Veljan Stack Valves, also known as sandwich or modular valves, are engineered to provide high-performance hydraulic control in a vertically integrated footprint. Designed to be mounted between a directional control valve and a standard subplate, these valves eliminate the need for external piping and complex manifold blocks. Capable of managing operating pressures up to 4500 psi (310 bar), the stackable design allows for multiple functions—such as pressure relief, flow control, and check functions—to be layered into a single, compact assembly. This modularity significantly reduces the overall installation envelope, making it the premier choice for modern, space-constrained industrial machinery.

By consolidating multiple hydraulic functions into a single vertical stack, Veljan Stack Valves minimize potential leak points and reduce the number of required fittings and hoses. This integrated approach enhances system reliability and simplifies hydraulic circuit design. Each modular component is built with the same rugged durability as the VT* series, featuring precision-machined internal paths that minimize pressure drop and heat generation. With a typical mechanical efficiency of 94%, these valves ensure that the hydraulic system remains productive and energy-efficient, providing stable control even during high-cycle operations or extreme temperature fluctuations.

The Veljan Stack Valve series offers unparalleled flexibility, allowing engineers to "build" a custom control circuit simply by stacking the necessary functional modules. This "plug-and-play" versatility drastically reduces assembly time and simplifies future system upgrades or modifications. Maintenance is streamlined as individual modules can be inspected or replaced without disturbing the primary system plumbing. Fully compatible with standard mineral oils and fire-resistant fluids like water glycols, these valves follow international mounting standards (ISO/CETOP), ensuring they are a versatile and easy-to-maintain solution for any high-performance hydraulic architecture.