In hydraulic systems for large loaders, excavators, marine deck machinery, and mining equipment, directional control valves face different demands than those on smaller machines. Flow rates are higher, actuator counts are greater, and downtime costs more.
One question comes up repeatedly: sectional or monoblock? Both have been used in high-flow applications for decades. The right choice depends on how the machine is used and how likely the circuit is to change.
This article looks at that decision using the DCV200 Series hydraulic multi-way directional control valve as a reference.
The Problem with Fixed Circuits
Large equipment rarely stays in one configuration. A loader may gain an auxiliary circuit for a grapple. An excavator may need an extra function for a specialized attachment. A marine winch system may require another control section as deck operations expand.
A monoblock valve handles this poorly. The body is one piece, and the section count is fixed at manufacture. If the machine needs another function later, the entire valve has to be replaced - not just a parts cost, but a redesign of the circuit, mounting, and plumbing.
How the DCV200 Sectional Design Responds
The DCV200 Series takes a modular approach. Sections bolt together, and each controls one work circuit. This produces several practical differences.
Adding or replacing sections. A new function can be added as a section. If one section fails, it can be replaced individually while the rest remain in place. This reduces downtime and parts cost compared with replacing an entire monoblock body.
Flow capacity. The DCV200 is rated at 200 L/min nominal flow and 350 bar operating pressure. This flow band supports faster cylinder cycles, larger actuators, and simultaneous operation of multiple functions.
Control options. Manual, pneumatic, or electro-hydraulic control can be mixed across sections - useful on machines that combine direct operator control with automated functions.
Environmental tolerance. Operating temperature range is −40°C to +80°C, with a viscosity range of 12 to 400 cSt. The body is phosphated and passes a 48-hour neutral salt spray test.
Section count. Available from 1 to 12 sections. Port thread is G1/4; mounting bolts are M12.
Where a Sectional Valve Fits
A sectional valve is not right for every machine. Where the circuit is fixed and the section count will never change, a monoblock design can be simpler and more cost-effective.
A sectional design deserves consideration when:
The machine is expected to gain functions over its service life
Individual circuit maintenance is preferred over full valve replacement
Flow demand is high, and multiple functions run simultaneously
Control methods need to vary across circuits
Equipment operates in marine, mining, or outdoor construction environments
Installation Notes
Before installation, check the valve body and clean all piping - contamination is the primary cause of spool sticking. Seals between sections must be flat and not twisted, and bolts should be tightened diagonally in stages to the specified torque.
If oil seeps between sections, check the connecting bolts first. If the valve is sluggish, check pump delivery, oil temperature, and oil cleanliness before inspecting the spool.
Supply and Ordering
The DCV200 Series supports OEM customization. Each valve is individually tested, with test data linked to its serial number.
To check a section configuration, request a sample, or get a price list, submit your parameters through the product page.
Conclusion
The choice between sectional and monoblock comes down to how the machine will be used over time. A monoblock design offers simplicity and fewer leak paths. A sectional design offers modularity, individual section service, and the ability to adapt as the circuit changes.
