英语翻译Other flow controlsFlow dividers - A flow-divider valve

英语翻译
Other flow controls
Flow dividers - A flow-divider valve is a form of pressure-compensated flow-control valve that receives one input flow and splits it into two output flows.The valve can deliver equal flows in each stream or,if necessary,a predetermined ratio of flows.The circuit in Figure 9 shows how a flow divider could be used to roughly synchronize two cylinders in a meter-in configuration.
Like all pressure- and flow-control devices,flow dividers operate over a narrow bandwidth rather than at one set point.Thus,flow variations in the secondary branches are likely.Therefore,precise actuator synchronization cannot be achieved with a flow-divider valve alone.Flow dividers can also be used in meter-out circuit configurations or cascaded - connected in series to control multiple actuator circuits,Figure 10.
Rotary flow dividers - Another technique for dividing one input flow into proportional,multiple-branch output flows is with a rotary flow divider.It consists of several hydraulic motors connected together mechanically by a common shaft.One input fluid stream is split into as many output streams as there are motor sections in the flow divider.Because all motor sections turn at the same speed,output stream flow rates are proportional and equal to the sum of displacements of all the motor sections.Rotary flow dividers can usually handle larger flows than flow divider valves.
The pressure drop across each motor section is relatively small because no energy is delivered to an external load,as is the usual case with a hydraulic motor.However,designers should be aware of pressure intensification generated by a rotary flow divider.If,for any reason,load pressure in one or more branches drops to some lower level or to zero,full differential pressure will be applied across the motor section in each particular branch.The sections thus pressurized will act as hydraulic motors and drive the remaining section(s) as pump(s).This results in higher (intensified) pressure in these circuits branches.When specifying rotary flow dividers,system designers must be careful to minimize the potential for pressure intensification.A pressure relief valve should be placed in any actuator fluid line where this condition may occur.Rotary flow dividers can also integrate multiple branch return flows into a single return flow.

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