Modular valves are stackable hydraulic control components designed to build compact, flexible, and customizable circuits without complex piping. Each module performs a specific function—such as pressure control, flow control, or directional control—and connects through standardized mounting surfaces. This allows engineers to configure, expand, or service systems easily while reducing leaks, space, and installation time.

Bestop provides a complete range of modular valves (sandwich valves) designed to meet international CETOP standards. Our hydraulic modular valves are fully compatible with leading brands such as Bosch Rexroth modular valve, Yuken modular valve and Vickers modular valve, offering the same performance and reliability at a significantly lower cost.

✔ Directly interchangeable with Sun Hydraulics, HydraForce, Bosch Rexroth, and Yuken brands.
✔ Lower cost compared to OEM brands
✔ Small batch orders supported
✔ Fast delivery & stable supply
✔ 100% pressure tested before shipment
✔ High-strength materials for long service life
✔ Multiple cavity options available, Custom specifications supported

Modular Valve

MBRV

MC

MPCV

MRV

MTCV

S type inline non return valve

Z2FS

Z2S

ZDB Z2DB-L4X

ZDR-30

ZDR-40

What is A Modular Valve ?

A modular valve, also called a stack valve or sandwich valve, is a type of hydraulic valve designed to be mounted in layers on a manifold or base plate. Each module in the stack performs a specific function—such as pressure control, flow control, or directional control—and all modules are connected internally through standardized ports, allowing multiple control functions to be combined into one compact system without external piping.

Modular Valve Categories

To simplify selection and system design, modular valves are grouped based on their functional roles within a hydraulic circuit. Each category is engineered to address a specific control requirement—whether it is managing pressure stability, adjusting actuator speed, directing oil flow, or preventing backflow. By organizing modular valves into clear categories, users can quickly identify the right combination of functions needed for their application, reduce system complexity, and improve overall efficiency. This structured approach is especially valuable when configuring stacked valve assemblies in compact hydraulic systems. Depending on system requirements, modular valves are typically divided into pressure control, flow control, and check functions. Modular valves are typically classified based on their function within a hydraulic system, mainly including pressure control, check control, and functional control modules.

Pressure Control Modular Valves

Pressure control modules are essential for protecting and stabilizing hydraulic systems by managing pressure levels in specific circuits.

  • Modular Relief Valve: Used to limit maximum system pressure and protect components from overload. It automatically releases excess pressure when the preset limit is reached, ensuring system safety.
  • Reducing Modular Valve: Designed to maintain a lower, stable pressure in a secondary circuit. This is especially useful when different parts of a system require different pressure levels.

Modular Check Valves

This type of valve allows hydraulic fluid to flow in one direction while preventing reverse flow. It plays a critical role in maintaining load stability and preventing pressure loss in hydraulic systems.

Modular check valves are commonly used in applications where holding pressure or preventing backflow is essential

Modular Flow Control Valves

This category refers to functional modules that help manage system logic and operation, such as controlling flow paths, sequencing actions, or assisting directional control.

Rather than representing a single valve type, modular control valves are a flexible group of components that support system customization and improve operational efficiency.

How to Choose the Right Modular Valve?

Choosing the right modular valve is essential to ensure the efficiency, safety, and stability of your hydraulic system. Because modular valves are designed to be stacked and combined, selecting the correct type is not just about a single function, but about how each module works together within the overall circuit. Factors such as system pressure, flow requirements, installation standards, and functional needs all play a critical role. A well-matched configuration can improve performance, reduce energy loss, and simplify future maintenance, while an incorrect selection may lead to system instability or unnecessary complexity.

  • Pressure requirements – Ensure the valve can handle the system’s maximum operating pressure and provide proper protection where needed
  • Flow capacity – Match the valve’s rated flow with your system to avoid restriction or inefficiency
  • Function type – Determine whether you need pressure control (relief or reducing), flow control, or check functions
  • Mounting standard – Confirm compatibility with your base plate and directional valve (e.g., ISO/CETOP standards)
  • Stack configuration – Plan how multiple modular valves will be combined within the system
  • Application environment – Consider working conditions such as temperature, load, and duty cycle

Modular Valve FAQ

Modular valves offer a compact design, easy installation, and flexible configuration. They reduce leakage points, simplify maintenance, and allow multiple hydraulic functions to be combined into one integrated system.

Common types include pressure control valves (such as relief and reducing valves), check valves, and functional control modules. These can be stacked together to achieve different hydraulic functions within a single system.

Unlike traditional inline valves that require external piping, modular valves are mounted in layers and connected internally. This makes the system more compact, easier to install, and more reliable.

Yes, modular valves are specifically designed to be stacked together. Different modules can be combined to create a customized hydraulic circuit based on your application needs.

They are widely used in industrial machinery, hydraulic presses, injection molding machines, construction equipment, and other systems that require compact and flexible hydraulic control.

Yes. Since each module is independent, it can be replaced or serviced individually without disassembling the entire system, reducing downtime and maintenance costs.

The number of modules that can be stacked depends on system pressure, flow requirements, and mounting standards. In most cases, several modules can be combined, but excessive stacking may affect performance and pressure loss.

Modular valves are typically designed to meet standard mounting interfaces such as CETOP or ISO standards. As long as the interface matches, they can be used with compatible directional control valves.

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