Brand-hydraulics AO DIRECTIONAL CONTROL VALVES Manuel d'utilisateur télécharger pdf (Page 3)

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A B

Tandem Center (T) - Powers cylinder or motor in

both directions. Pump unloads to tank when

spool is in neutral. Cylinder or motor blocked

when spool in neutral.

Open Center (O) - All of the ports are connected

to tank when the spool is in neutral. Allows

cylinder to move or motor to rotate when spool is

in neutral.

Fine Metering Spool (M) - Requires external

locking valves to hold cylinder when spool is in

neutral position. Extremely fine metering control.

This spool requires a pressure compensated

pump.

P T

Tandem Metering Spool (TM) - Similar to (T)

spool except much finer metering control.

Cylinder or motor blocked in neutral and pump

unloads to tank.

P T

A B

Closed Center (C)- All ports are blocked in

neutral. Blocks cylinder or motor in neutral.

Required for use with pressure compensated

pump.

P T

A B

Tandem Three Way (T3) - Powers the cylinder in

one direction. Pump unloads to tank when spool

is in neutral, or when spool is being reversed.

Cylinder is blocked when spool is in neutral. Port

"B" is plugged.

P T

SPOOL SCHEMATICS:

SAFETY PRECAUTIONS:

 It is the purchaser’s responsibility to determine the suitability of any Brand Hydraulics Co. product for an intended

application, and to ensure that it is installed in accordance with all federal, state, local, private safety and health

regulations, codes and standards. Due to the unlimited variety of machines, vehicles and equipment on which our

products can be used, it is impossible for Brand Hydraulics Co. to offer expert advice on the suitability of a product

for a specific application. It is our customer’s responsibility to undertake the appropriate precautions, testing and

evaluation to prevent injury to the end-user.

 Overpressure may cause sudden and unexpected failure of a component in the hydraulic system, resulting in serious

personal injury or death. Always use a gauge when adjusting a relief valve.

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Brand-hydraulics AO DIRECTIONAL CONTROL VALVES Manuel d'utilisateur Page 3

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