A hydraulic combination valve brings two or more hydraulic control functions together in a single unit, reducing the need for separate components.

The Webtec CV120 combines a variable priority flow divider with a directional control valve, allowing hydraulic flow rate and direction to be controlled from one compact assembly.

This arrangement is particularly useful on mobile machinery and industrial hydraulic equipment where installation space is limited. Combining the two functions reduces the number of hoses, fittings and connections required, helping to simplify installation and reduce overall system costs.

Yes. A hydraulic combination valve can provide both flow regulation and directional control, allowing an operator to adjust motor speed and select its direction of operation.

The Webtec CV120 uses a manually adjustable, single-turn dial to regulate hydraulic flow and a lever-operated directional spool to control the flow path through the valve.

This makes it suitable for applications requiring variable-speed hydraulic motor control without installing separate flow-control and directional valves. The CV120 is available with different spool types and operating actions to suit hydraulic motor and double-acting actuator applications.

A pressure-compensated flow-control valve helps maintain a consistent flow rate even when the load on a hydraulic motor changes.

The Webtec CV120 uses flow-control design and components from the VFD120 Series to maintain a consistent regulated flow under varying load pressures. This helps prevent unwanted changes in motor speed during operation.

Webtec's OptiFlo® technology explains the adaptive pressure-compensation principle used in its VFD flow-divider range. A pressure-balanced, spring-loaded spool automatically responds to changing pressures, adjusting the flow openings to maintain the required pressure differential.

This helps maintain stable hydraulic flow without continual manual adjustment, provided sufficient inlet flow is available.

For more information, see Webtec's OptiFlo® technology.

Yes. A hydraulic system can use a single pump to supply multiple circuits when suitable flow-control and directional valves are incorporated.

The Webtec CV120 combines regulated flow control with directional control and can be connected to downstream valves using a high-pressure carry-over (HPCO) arrangement.

This enables additional hydraulic functions to be supplied without necessarily requiring a separate pump. The pressure-compensated flow-control section helps maintain the required regulated flow when circuit load pressures vary.

The design of the downstream circuit and its pressure protection must be considered carefully. When an HPCO connection is used, a separate pressure relief valve is required for the downstream circuit.

Yes. The Webtec CV120 offers configurations specifically suited to applications requiring full inlet flow to one hydraulic motor and regulated flow to another.

The 160B and 250B versions provide full inlet flow from port A and regulated flow from port B. This arrangement is particularly useful where one track motor requires full pump flow while a second motor requires adjustable speed.

Alternatively, the standard 160 and 250 configurations provide regulated flow to both A and B service ports.

The appropriate arrangement depends on the required motor speeds, available pump flow and hydraulic circuit design.

The Webtec CV120 is available with two regulated flow capacities:

• 0–60 L/min (0–16 US gpm) – flow size 160.
• 0–95 L/min (0–25 US gpm) – flow size 250.

Each flow size is available with regulated flow on both A and B ports or, with the B suffix, regulated flow on port B and full inlet flow on port A.

When selecting a valve, the regulated flow range should be matched to the hydraulic motor or cylinder requirements. The flow range determines the available adjustment, while the hydraulic system must provide sufficient inlet flow to achieve the desired operating speed.

The Webtec CV120 Series has a maximum rated pressure of 250 bar (3,600 psi) and a total flow capacity of 120 L/min (32 US gpm).

The maximum regulated flow capacity is 95 L/min (25 US gpm), depending on the selected configuration.

The valve incorporates an adjustable pressure relief valve, factory set to 220 bar (3,200 psi) unless otherwise specified.

The maximum rated pressure and the relief valve setting are different specifications. The valve must be selected to suit the pressure and flow requirements of the complete hydraulic circuit, including any downstream components.

Directional valve spool selection depends on the type of hydraulic actuator being controlled and the required flow paths during operation.

The Webtec CV120 is available with two spool types:

• DA – Double Acting: A spool option for double-acting hydraulic actuator applications.
• MR – Motor Spool: A spool option intended for hydraulic motor applications.

The two versions have different hydraulic symbols and operating characteristics. Selecting the correct spool requires consideration of the actuator and the required circuit behaviour, particularly when the directional control lever is in its centre position.

The CV120 datasheet provides the hydraulic symbols for both spool configurations to assist with selection.

Yes. The Webtec CV120 offers two three-position directional spool control options.

A spring-centred version returns the control lever to its centre position when released. This can be useful where the operator requires the valve to return to its centre condition automatically.

A detent version holds the selected spool position until the operator moves the lever.

The CV120 also offers two lever orientations: down, facing away from the service ports, or up, facing in the same direction as the service ports.

These options allow the valve to be configured to suit the application and operator access requirements.

A pressure relief valve provides protection against excessive hydraulic pressure and is an important consideration when designing a hydraulic circuit.

The Webtec CV120 incorporates a full-flow, pilot-operated pressure relief valve to protect the A and B service ports.

The relief valve is adjustable and is factory set to 220 bar (3,200 psi) unless another setting is specified.

This built-in protection can reduce the need for a separate relief valve for the controlled service ports. However, it should not be assumed to protect every part of the hydraulic system, particularly if additional circuits are connected downstream using high-pressure carry-over.

Yes. Hydraulic valves can be connected in series when the circuit is designed to provide suitable flow and pressure protection for downstream components.

The Webtec CV120 supports this arrangement using a high-pressure carry-over (HPCO) coupling, fitted to port T1.

This allows the valve to supply downstream hydraulic valves or valve-bank assemblies using standard fittings. It can be useful where several hydraulic functions need to operate from a single pump.

A separate pressure relief valve must be installed to protect the downstream circuit when an HPCO connection is used. This is necessary because the CV120's main relief valve protects its own A and B service ports.

A second relief valve is needed because the CV120's main pressure relief valve does not provide pressure protection for the downstream circuit supplied through the high-pressure carry-over connection.

When an HPCO coupling is installed at port T1, an additional relief valve must control the pressure supplied to downstream motors or actuators.

Webtec offers the RV120-PO second relief valve for this application, factory set to 207 bar (3,000 psi).

The CV120's main relief valve is normally factory set to 220 bar (3,200 psi). The two relief valves operate independently, protecting different parts of the hydraulic circuit.

Both settings should be considered when designing the complete system.

Yes. The Webtec CV120 provides alternative pump inlet and tank connections to simplify installation in different hydraulic systems.

The valve includes two pump inlet connections, P1 and P2, and two tank connections, T1 and T2. These allow the hydraulic plumbing to be connected from either the side or top of the valve.

Standard porting options include:

• 3/4" BSPP.
• 1-1/16"-12UN #12 SAE ORB.

Other port threads may be available by special order.

The selected connections must follow the appropriate hydraulic circuit diagram. Particular attention is required when an HPCO connection is used, as this is fitted to port T1.

A combination hydraulic valve can simplify installation by incorporating multiple control functions into one component.

The Webtec CV120 combines flow regulation, directional control and pressure relief in a compact assembly. This reduces the number of separate valves, hoses and fittings required.

The CV120 has a painted cast ductile-iron body with steel internal components and an aluminium flow-adjustment knob. It weighs approximately 8.9 kg (19.5 lb) and is mounted using two M8 or 5/16" bolts.

When planning the installation, sufficient clearance should be provided for the control lever, flow-adjustment dial and hydraulic connections.

Detailed dimensions are available in the CV120 datasheet.

The Webtec CV120 is designed for use with mineral hydraulic oils conforming to ISO 11158.

The specified temperature ranges are:

• Hydraulic fluid: -30 to 120 °C (-22 to 248 °F).
• Ambient environment: -30 to 50 °C (-22 to 122 °F).

The fluid temperature and ambient temperature limits are separate specifications and both must be considered when selecting the valve.

For applications using alternative hydraulic fluids, compatibility should be confirmed with Webtec before installation.

No electrical power supply is specified for operating the standard Webtec CV120.

The valve uses a manually adjusted, single-turn flow-control dial and a mechanical lever for directional control.

This arrangement provides direct operator control of flow rate and direction without requiring an electronic controller for the valve.

For applications requiring electrical or remote control of priority flow, Webtec also offers separate products such as the VFD120-E electrically operated flow divider and the VFD120MD remote proportional-control flow divider. These are different products and do not incorporate the CV120's combined directional control arrangement.

A variable priority flow divider controls how hydraulic flow is distributed between a regulated circuit and a bypass circuit. A combination valve adds another control function, such as directional control, within the same body.

The Webtec VFD120 is a standalone variable priority flow divider, while the CV120 combines VFD120-derived flow control with a directional spool and integrated service-port pressure relief.

Both product families have a total flow capacity of 120 L/min (32 US gpm), with manually controlled versions offering regulated flow capacities up to 95 L/min (25 US gpm).

However, their maximum pressure ratings differ:

• CV120: Up to 250 bar (3,600 psi).
• VFD120: Up to 420 bar (6,000 psi).

The appropriate choice depends on whether directional control is required within the same valve, the working pressure and the available installation space.

Selecting the correct hydraulic combination valve requires matching its flow-control, directional and pressure characteristics to the hydraulic system.

For the Webtec CV120, the main considerations are the required regulated flow range, whether both A and B ports need regulated flow or port A needs full inlet flow, and whether a double-acting or motor spool is required.

The directional spool can be specified with detent or spring-centred operation, and different lever orientations and hydraulic port connections are available.

The required main relief valve setting and any high-pressure carry-over connections must also be considered. When HPCO is specified, the additional pressure relief valve is required.

The CV120 datasheet provides the available configurations and ordering information. Webtec's technical sales team can assist with selecting the appropriate valve for more specialised hydraulic circuits.