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Technical Reference

HIC manifold design guidelines, tooling,

torque specifications, port and cavity dimensions

T echnical Reference Section Contents

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Reviewing Circuit

All designs begin with a sche-matic circuit design inspired by the application. Before the planning stage, review the design utilizing the following steps:

• Match schematic symbols to model codes.

• Note size and cavity of each valve and write it on schematic.

• Note port numbers of the valves and write them on schematic.

• Note manifold port types and sizes specified by customer.

• Note pressure, flow and material of manifold block (steel or aluminum).Circuit questions should be answered by the customer before beginning a design. It is also recommended that schematic hydraulic regions or networks be color coded using color pens. Regions or net-works may be broken down in individual colors (pressure, tank, pilot, etc.) but it may be easier to design if regions are broken down into sub-regions such as pressure from port one of a solenoid valve to port two of a relief valve. Colored layers may be assigned later to match schematic circuit coloring.

Initial Design

Once the circuit is fully under-stood, it is advisable to lay the design out by hand first. Things to consider while plan-ning the design are:

• Block size is often specified by customer.• Specify an overall

envelope size, in addition to the specified block size. Overall envelope size includes block size and any valves or fittings protruding from the manifold block.• Restrictions specified for a mounting surface of the manifold block. Valves and ports may be restricted

from a particular surface.

• Specify mounting holes, threaded holes and thru holes (if necessary).• Arrange valves in a logical manner. Valves and ports in the same regions should be located in close proximity to each other.

• Eliminate as many turns in the regions as possible to reduce the number of cross drill holes or construction lines. This helps keep pressure drops ( D P) and

manufacturing costs down.

Material Sizes

To obtain an optimal cost man-ifold it is desirable to select a standard material size for the manifold, compare the block size with the standard mate-rial size table. See Standard Material Sizes (page M-5). If a standard size is not available, a cut plate may be used. Hydraulic Schematic

If a schematic is desired on the assembly, it may be cre-ated from existing symbols. As an alternative, the entire circuit may be created outside of an assembly and imported as a symbol (block). All of the Vickers screw-in cartridge valves have schematic sym-bols which can be found in the SICV Cartridge Valve Library of Symbols CD, used in conjunc-tion with AutoCad software. Schematic symbols not found in the library may be created on an “as needed” basis.Accurate Design

All dimensions on CAD design must be accurate and to scale in order to be utilized by CAM software in conjunction with CNC machine tools. Manually or interactively modified

dimension cannot be tolerated.Example:

Note: Failure to ensure that

CAD dimensions are accurate and to scale may result in improper machinery by CNC Machine Tools.

Datum Point

The datum point or origin point (0,0,0) on machining drawings is the upper left corner when facing the front view.Assembly Dimensioning Dimension all ports, mount-ing holes and overall envelope size.

External Clearances

Allow enough room for clear-ance around solenoid coils, handknobs, levers and wrench clearance for fittings. If 90° elbow fittings are to be used, some may be required to swing a full 360 arc.Assembly Notes

Notes are added for standard or special assembly, handling, or shipping instructions, as well as special stampings.Port T able

Include a port table with names and sizes of all ports.Standard T ooling

In order to obtain fast

turnaround on designs, limit the tooling used to that listed in the standard tooling table. See Preferred Tooling for Machining Manifolds (page M-6).

General Guidelines for

Hydraulic Integrated Circuits (HIC)

professional in the design of manifold blocks and related hydraulic systems. It is the designer’s responsibility to verify the adequacy of the

design through approporate verifications, review and test-ing of the final design.