Premium Stack Valves

Stack valves are a type of hydraulic valve system that allows you to combine multiple valves into a single, compact unit. This can be useful in applications where space is limited or you need to simplify your hydraulic system. Some examples of stack valves include modular valves, sectional valves, and custom valve assemblies.

They are commonly used in mobile hydraulics, industrial machinery manufacturing, and other applications where a compact and efficient hydraulic system is required. At Hydraulic Supply (HSC), we offer a wide selection of modular stack valves in D03 and D05 sizes from top brands like Danfoss, so you can find the perfect one for your needs. Whether you need a pre-configured valve stack or a custom solution, our team of experts can help you find the right valve stack for your application.

SystemStak Relief Valves, NFPA-D05 Size

Product is currently not available online.
Please call 800-507-9651 for assistance.
SystemStak Relief Valve, NFPA-D05 Size, Single Relief, Pressure Limited in P Port, 60-4500 PSI Screw & Locknut Adjustment

Product is currently not available online.
Please call 800-507-9651 for assistance.

Compare Products

Remove This Item

You have no items to compare.

My Wish List

Last Added Items

You have no items in your wish list.

Quick Add Product

*SKU

*Qty

Add to: Wishlist Cart

* Required Fields

Account Summary

Short Code:

Credit Limit:

Current Balance:

Choosing the Best Stack Valve

Stack valves on this page are part of the Danfoss SystemStak line and are available in NFPA D03 and D05 sizes. These valves are designed to be installed between a directional control valve and a subplate, allowing multiple functions in a single, compact stack.

Available options include flow control valves with needle and locknut adjustment, pilot-operated check valves with fixed cracking pressures, and relief valves rated from 60 to 4500 PSI. Use D03 valves for standard capacity systems and D05 valves for applications requiring higher flow or dual-function relief control.

If you need help selecting or configuring a valve stack, contact us for technical support

Benefits of Using Our Stack Valves

SystemStak valves from Danfoss are engineered for efficient installation in space-limited hydraulic systems. All models follow NFPA D03 and D05 mounting standards, allowing them to integrate easily into existing subplates without additional modifications.

By stacking multiple functions into one compact assembly, these valves reduce external hoses, fittings, and leak points. Options include adjustable flow control for precision metering, relief valves with wide pressure ranges, and pilot-operated check valves for load holding. Many products are in stock and ready to ship, and all are supported by our repair center for service and maintenance.

For product guidance or sourcing assistance, contact us, and our team will help you find the right configuration for your equipment.

Stack Valve FAQs

What is a Stack Valve?

A stack valve is a hydraulic valve designed to be installed between a directional control valve and a subplate. It allows multiple functions, such as flow control or pressure regulation, to be combined in a single, compact assembly.

How Does a Stack Valve Work?

Stack valves work by directing or controlling hydraulic flow through specific valve functions arranged in a stack. Each valve layer performs its own function, and the stack is secured together between the directional valve and the subplate.

Are Mounting Subplates Required for Installation?

Yes. Stack valves require the correct NFPA D03 or D05 subplate to mount properly and function as intended.

Do You Offer Both Single and Dual-Function Relief Valves?

Yes. SystemStak relief valves are available in single and dual relief configurations to match different system requirements.

What Adjustment Features Are Available?

Many models include screw and locknut adjustments for precise pressure or flow settings during operation.

Do You Carry Other Types of Hydraulic Valves?

Yes. In addition to stack valves, we offer a full selection of hydraulic valves and accessories, including pressure reducing, directional, and check valves.