Large electro-hydraulic directional valves require more than the correct valve model. They also need a suitable mounting interface that connects the valve to the hydraulic system safely and efficiently.

A DSHG valve subplate provides this interface.

DSHG series electro-hydraulic directional valves use a pilot-operated structure to control relatively high hydraulic flow. The main valve must therefore be securely mounted and correctly connected to pressure, tank and working lines. Yuken lists DSHG-04, DSHG-06 and DSHG-10 as pilot-operated directional valve sizes for higher-flow applications.

Compatible DHGM-series subplates provide threaded external ports and a machined mounting surface for these valves, helping simplify installation in industrial hydraulic systems.

What Is a DSHG Valve Subplate?

A hydraulic valve subplate is a machined mounting base installed underneath a directional valve.

Instead of connecting hoses directly to the valve body, the valve is bolted onto the subplate while hydraulic pipes or hoses connect to threaded ports in the subplate.

A typical installation can be understood as:

Hydraulic Lines → Subplate → DSHG Valve → Hydraulic Actuator

The subplate transfers hydraulic oil between the external piping and the valve’s mounting ports.

For electro-hydraulic directional valves, this arrangement can provide several practical benefits:

• Secure valve mounting
• Clear hydraulic port connections
• Easier piping arrangement
• Convenient valve replacement
• Reduced need for custom manifold machining
• Better organization of large hydraulic systems

Why DSHG Electro-Hydraulic Valves Need the Correct Subplate

DSHG valves are used in hydraulic systems where larger flow capacity is required than a small direct-operated solenoid valve can normally handle.

The DSHG structure combines a solenoid-operated pilot stage with a hydraulically operated main stage. When the pilot solenoid changes the pilot oil direction, hydraulic pressure shifts the main spool and changes the main system flow path.

Because the main valve controls significant hydraulic flow, the mounting interface must correctly match:

• P pressure port
• T tank port
• A and B working ports
• Pilot and drain arrangements where applicable
• Mounting bolt pattern
• Sealing surface

If the wrong subplate is selected, the valve may physically appear similar but the hydraulic ports or mounting pattern may not match correctly.

For this reason, the valve size and complete subplate model should be confirmed together.

DSHG-04, DSHG-06 and DSHG-10 Subplates

Different DSHG valve sizes require different subplates.

For commonly used DSHG electro-hydraulic directional valves, Yuken documentation lists DHGM subplate families matched to the valve size.

DSHG-04 Subplates

Typical compatible models include:

• DHGM-04
• DHGM-04X

European-standard versions listed by Yuken include thread options such as 1/2 BSP.F and 3/4 BSP.F, depending on the selected subplate configuration.

DSHG-06 Subplates

Typical models include:

• DHGM-06
• DHGM-06X

BSP versions are available with larger threaded ports, including 3/4 BSP.F and 1 BSP.F in the referenced configurations.

DSHG-10 Subplates

For larger DSHG-10 valves, corresponding models include:

• DHGM-10
• DHGM-10X

The referenced BSP versions use larger connection sizes such as 1-1/4 BSP.F and 1-1/2 BSP.F.

These examples show why customers should not order a mounting plate only according to appearance.

The exact valve size, connection standard and port configuration must be checked.

Different Thread Standards Matter

Hydraulic equipment is exported and installed in many different regions, so subplate connection threads may vary.

Yuken documentation shows DSHG-compatible subplates in several connection standards, including:

• Rc threads
• BSP.F
• NPT

For example, DSHG-04, DSHG-06 and DSHG-10 subplates are listed in Japanese, European and North American connection versions.

This is especially important for replacement projects.

A subplate may match the valve mounting surface perfectly but still be inconvenient to install if the external threaded ports do not match the customer’s existing pipe fittings.

Before ordering, customers should therefore confirm both:

Valve mounting interface + External thread standard

Subplate Port Arrangement and Hydraulic Connections

The subplate connects the DSHG valve to the main hydraulic circuit.

Typical main ports include:

P – Pressure Inlet
Connects hydraulic pump pressure to the directional valve.

T – Tank Return
Returns hydraulic oil from the valve to the reservoir.

A / B – Working Ports
Connect to the hydraulic cylinder or motor.

Depending on the DSHG configuration, pilot and drain arrangements also need to be considered.

This is particularly important because pilot-operated directional valves may use different:

• Internal pilot arrangements
• External pilot arrangements
• Internal drain arrangements
• External drain arrangements

A mounting base must therefore support the actual hydraulic configuration of the valve and machine.

Subplate vs Custom Hydraulic Manifold

A DSHG valve can also be mounted directly onto a specially machined hydraulic manifold.

However, a standard subplate can be more convenient for many maintenance and standalone installations.

Standard Subplate

Suitable when:

• One valve is installed independently
• External piping is acceptable
• Fast replacement is important
• A standard mounting solution is preferred

Custom Manifold

Suitable when:

• Several valves are integrated together
• Equipment space is highly restricted
• Internal drilled oil passages are required
• The hydraulic system is produced in larger quantities

When a separate subplate is not used, Yuken notes that the mounting surface must be properly machined.

For machinery repair and low-volume equipment, using the correct standard subplate can reduce the need for custom machining.

Why Mounting Surface Quality Matters

The contact surface between the DSHG valve and its subplate is part of the hydraulic sealing system.

If the mounting surface is damaged or contaminated, hydraulic oil may leak between ports or externally.

Common installation problems include:

• Metal particles trapped between surfaces
• Damaged O-rings
• Scratches on the mounting face
• Incorrect seals
• Uneven bolt tightening
• Dirt entering hydraulic ports

These problems can cause:

• External oil leakage
• Internal cross-port leakage
• Pressure loss
• Unstable valve operation
• Contamination entering the system

Before installing the valve, both the subplate and valve mounting surfaces should be clean and inspected carefully.

Mounting Bolts Must Match the Valve Size

Larger DSHG valves require stronger mounting hardware.

Yuken publishes different mounting bolt specifications and tightening requirements for DSHG-04, DSHG-06 and DSHG-10 valves, reflecting the different physical sizes and mounting loads.

This means technicians should avoid replacing original mounting bolts with arbitrary fasteners.

Correct bolt:

• Diameter
• Length
• Strength
• Quantity
• Tightening torque

all contribute to secure valve installation and proper sealing.

Over-tightening is also undesirable because it can damage the mounting surface or create mechanical distortion.

Common Applications for DSHG Valve Subplates

DSHG electro-hydraulic directional valves and their mounting subplates are commonly used in higher-flow industrial hydraulic systems.

Typical applications can include:

• Hydraulic presses
• Injection and forming machinery
• Heavy industrial equipment
• Machine tools
• Steel and metal processing machinery
• Material handling equipment
• Large hydraulic power units
• Industrial production lines

The subplate provides a convenient connection point between the large directional valve and the external hydraulic piping.

In maintenance applications, replacing the valve while retaining a compatible subplate can also simplify service work.

What to Check Before Ordering a DSHG Subplate

A DSHG valve subplate should never be selected only by valve appearance.

Before ordering, confirm the following information.

DSHG Valve Size

Examples include:

• DSHG-04
• DSHG-06
• DSHG-10

The subplate must match the valve’s mounting pattern.

Complete Valve Model

A complete DSHG model helps determine the pilot and drain arrangement and overall system configuration.

Subplate Model

If available, provide the original DHGM model directly.

For example:

• DHGM-04…
• DHGM-06…
• DHGM-10…

External Thread Standard

Confirm whether the existing system uses:

• BSP
• NPT
• Rc
• Another connection standard

Port Size

Different subplate versions may use different external port sizes even for the same main valve family.

Pilot and Drain Configuration

For electro-hydraulic valves, the pilot oil and drain arrangement should be checked carefully.

System Pressure and Flow

Although the main valve determines much of the hydraulic capacity, the subplate and external connections also need to be suitable for the operating system.

Common DSHG Subplate Selection Mistakes

Several problems occur repeatedly in replacement projects.

Choosing Only by DSHG Size

Knowing that the valve is DSHG-06 is useful, but there may still be multiple compatible subplate configurations.

Ignoring Thread Type

A BSP subplate cannot necessarily connect directly to an existing NPT piping system.

Ignoring Pilot and Drain Requirements

A pilot-operated directional valve may require a different hydraulic connection arrangement depending on its configuration.

Reusing a Damaged Subplate

If an old mounting surface is severely scratched, corroded or distorted, installing a new valve onto the damaged base may still result in leakage.

Incorrect Bolt Selection

Wrong bolt length or tightening can cause poor sealing or mechanical problems.

Information to Provide for a DSHG Subplate Inquiry

For faster model confirmation, customers can send:

• Complete DSHG valve model
• Original subplate model
• Valve photos
• Subplate photos
• Bottom mounting surface
• Hydraulic symbol
• Thread size
• Required port connection
• Pilot and drain information
• System pressure and flow
• Equipment application
• Required quantity

For replacement projects, clear photographs of both the DSHG valve and existing mounting base are particularly useful.

This helps confirm whether the replacement requirement is only the subplate or whether the valve and base need to be matched together.

How XYIYEYA Supports DSHG Valve and Subplate Selection

XYIYEYA supplies hydraulic directional valves, mounting bases and related hydraulic components for industrial equipment and replacement applications.

For DSHG electro-hydraulic directional valve applications, customers can provide the original valve and subplate information for model confirmation.

Our team can help check key factors including:

DSHG Size + DHGM Subplate Model + Mounting Interface + Thread Size + Port Arrangement + Pilot/Drain Configuration

Related products can include:

• DSHG electro-hydraulic directional valves
• DHGM-type mounting subplates
• 4WEH electro-hydraulic directional valves
• Solenoid directional valves
• Hydraulic valve manifolds
• Modular hydraulic valves
• Hydraulic accessories

Matching the valve and mounting base before shipment can reduce installation problems and unnecessary modification at the customer’s site.

Conclusion

A DSHG valve subplate is an important part of installing an electro-hydraulic directional valve correctly.

It provides a secure mechanical mounting surface while connecting pressure, return and actuator oil lines to the valve.

For DSHG-04, DSHG-06 and DSHG-10 applications, different DHGM subplate versions are available with different thread and port configurations.

Therefore, correct selection should consider:

DSHG Valve Size + Subplate Model + Mounting Pattern + Thread Standard + Port Size + Pilot/Drain Arrangement

A properly matched mounting base can simplify piping, reduce installation work and help ensure reliable operation of large electro-hydraulic directional valves.