Double Overcentre Valve – VBCD Type A

Product Category: Hydraulic Valves → Overcentre Valves / Counterbalance Valves
Product Type: Double Overcentre Valve
Model Series: VBCD DE A / VBCD Type A
Brand: VBCD / Oleodinamica Marchesini series

The VBCD DE A is a double overcentre valve designed to control hydraulic actuator movement and block the actuator in both directions. The valve helps provide controlled load descent and prevents the load from running away due to its own weight, while also helping prevent actuator cavitation. The Type A configuration differs from the standard version in its port arrangement and pilot ratio. (Hydrapac Italia)

Product Details

The VBCD Type A is a double counterbalance / double overcentre hydraulic valve for applications where a hydraulic actuator needs controlled movement and load holding in both directions.

For the standard VBCD DE A configuration, V1 and V2 are connected to the pressure/supply side, while C1 and C2 are connected to the actuator being controlled. The manufacturer documentation specifies in-line mounting. (Hydrapac Italia)

Key Features

• Double overcentre valve configuration

• Controls actuator movement in both directions

• Helps hold an overrunning load

• Helps prevent uncontrolled load descent

• Helps prevent actuator cavitation

• Type A port arrangement

• Available with different pilot ratios depending on size

• Zinc-plated steel body

• Hardened and ground internal components

• BUNA-N seals as standard

• In-line mounting

• Other pressure settings available on request (Hydrapac Italia)

Applications

The VBCD Type A can be used for hydraulic systems requiring load holding and controlled movement, including:

• Hydraulic cylinders

• Lifting equipment

• Hydraulic platforms

• Construction machinery

• Mobile hydraulic equipment

• Material handling machinery

• Agricultural machinery

• Industrial hydraulic systems

• Tilting mechanisms

• Hydraulic lifting and positioning systems

It is particularly relevant where an actuator is exposed to an overrunning or suspended load and controlled movement is required. (HFD Hydraulic Valves)

Specifications

The following specifications are based on published technical information for the VBCD DE A series. Exact specifications should still be checked against the manufacturer's datasheet and the exact valve size ordered.

Model	Pilot Ratio	Max. Flow	Max. Pressure	Port Connection
V0418 – VBCD 1/4'' DE A	1:4.5	25 L/min	350 bar	G 1/4''
V0422 – VBCD 3/8'' DE A	1:4.5	40 L/min	350 bar	G 3/8''
V0432 – VBCD 1/2'' DE A	1:4.5	60 L/min	350 bar	G 1/2''
V0435 – VBCD 3/4'' DE A	1:5.5	100 L/min	350 bar	G 3/4''
V0436 – VBCD 1'' DE A	1:5.5	150 L/min	350 bar	G 1''

These model codes, flow capacities, pressure ratings and pilot ratios are published for the VBCD DE A range. (Flowfit Hydraulics)

Standard setting: 320 bar is stated in the published technical documentation. The documentation also states that the valve setting should be at least 1.3 times the load pressure to allow the valve to close at maximum load pressure. (Hydrapac Italia)

Materials:

• Body: Zinc-plated steel

• Internal parts: Hardened and ground steel

• Seals: BUNA-N

• Leakage: Minor/negligible leakage depending on the published source terminology (Hydrapac Italia)

All Model Numbers – VBCD Type A

For the standard VBCD DE A Type A double overcentre valve, the published range includes:

• V0418 – VBCD 1/4'' DE A

• V0422 – VBCD 3/8'' DE A

• V0432 – VBCD 1/2'' DE A

• V0435 – VBCD 3/4'' DE A

• V0436 – VBCD 1'' DE A (Hydrapac Italia)

Other VBCD Type A Variants

The wider VBCD family also includes:

• VBCD DE A – Double Overcentre Valves, Type A

• VBCD DE A CC – Double Overcentre Valves for Closed Centre, Type A

• VBCD DE A SF – Double Overcentre Valves Type A with Brake Release

• VBCD DE FL – Double Overcentre Flangeable Valves

• VBCD DE A FLV – Double Overcentre Valves Type A, screw fixing

• VBCD DE CETOP 3 – Double Overcentre Valve for Danfoss OMP/OMR motors

• VBCD DE CETOP 5 – Double Overcentre Stackable Valve (Intercom Celje)

Important: These are different VBCD configurations and should not be treated as interchangeable with the standard VBCD DE A without checking the hydraulic circuit, port configuration, flow, pressure and pilot ratio.

FAQ

What is a VBCD Type A valve?

The VBCD Type A is a double overcentre hydraulic valve used to control and block actuator movement in both directions, particularly for applications involving overrunning loads. (Hydrapac Italia)

What is the difference between VBCD DE A and VBCD SE A?

VBCD DE A is a double overcentre valve, providing control in both actuator directions. VBCD SE A is a single overcentre valve that controls/block movement in one direction. (Hydrapac Italia)

What does an overcentre valve do?

An overcentre valve helps prevent a load from running away and provides controlled actuator movement. It is particularly useful when the load can drive the actuator faster than the hydraulic pump is supplying flow.

Is VBCD Type A suitable for hydraulic cylinders?

Yes. The VBCD DE A is designed for controlling hydraulic actuators and can be used with double-acting hydraulic cylinders where load holding and controlled movement are required.

What sizes are available?

The published VBCD DE A range includes 1/4'', 3/8'', 1/2'', 3/4'' and 1'' versions. (Flowfit Hydraulics)

What pressure can the VBCD DE A handle?

The published standard VBCD DE A models have a maximum pressure of 350 bar. Always verify the exact model and manufacturer's current datasheet before installation. (Flowfit Hydraulics)

What information should I provide when ordering?

For accurate selection, provide:

• VBCD model/code

• Port size

• Hydraulic system pressure

• Required flow rate

• Cylinder or actuator size

• Load characteristics

• Existing valve configuration

• Photos/nameplate if replacing an existing valve

Related Models

• VBCD 1/4'' DE A

• VBCD 3/8'' DE A

• VBCD 1/2'' DE A

• VBCD 3/4'' DE A

• VBCD 1'' DE A

• VBCD DE A CC

• VBCD DE A SF

Alternative Products

Depending on the application, possible alternatives include:

• Hydraulic Counterbalance Valve

• Double Counterbalance Valve

• Pilot-Operated Counterbalance Valve

• Double Pilot-Operated Check Valve

• Load Holding Valve

The alternative must be selected according to the required pressure, flow, pilot ratio, actuator configuration and load characteristics.

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Datasheet / Catalog / PDF: Available upon enquiry, subject to the exact model and manufacturer documentation.

For replacement enquiries, send us the existing VBCD valve model number or a clear photo of the valve/nameplate so we can help identify the correct model.

DOUBLE OVERCENTRE VALVE - VBCD TYPE A SUPPLY BY ASIA-MECH MALAYSIA PHILIPINES THAILAND INDONESIA