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Category: Fluid Flow

Fluid Flow

Hydraulic Meter-out Circuit

Posted on January 6, 2011October 28, 2012

In the meter-out operation shown in Figure 6.39, the direction of the flow through the circuit is simply changed as can be made out from…

Fluid Flow

Hydraulic Meter-in Circuit

Posted on January 6, 2011October 28, 2012

Meter-in is a method by which a flow control valve is placed in a hydraulic circuit in such a manner that there is a restriction…

Fluid Flow

Pressure-compensated Flow Control Valves

Posted on January 6, 2011October 28, 2012

Figure 6.35 illustrates the operation of a pressure-compensated valve. The design incorporates a hydrostat which maintains a constant 1.4kg/cm2 (20 psi) pressure differential across the…

Fluid Flow

Hydraulic Non-pressure-compensated Valve

Posted on January 6, 2011October 28, 2012

This type of valve is used where the system pressures are relatively constant and the motoring speeds are not too critical. They work on the…

Fluid Flow

Hydraulic Ball Valves

Posted on January 6, 2011October 28, 2012

This is another type of flow control valve shown in Figure 6.31. It is made up of a ball with a through hole which is…

Fluid Flow

Hydraulic Butterfly Valve

Posted on January 6, 2011October 28, 2012

This is another type of flow control valve. It consists of a large disk which is rotated inside a pipe, the restriction in flow being…

Fluid Flow

Hydraulic Globe Valve

Posted on January 6, 2011October 27, 2012

This is the simplest form of a flow control valve. The globe valve gets its name from the disk element ‘globe’ that presses against the…

Fluid Flow

Hydraulic Flow Control Valves

Posted on January 6, 2011October 27, 2012

A flow control valve is a device used for adjusting or manipulating the flow rate of a liquid or a gas in a pipeline. The…

Fluid Flow

Rotary Four-Way Directional Control Valves

Posted on December 22, 2010October 28, 2012

Although most direction control valves are of spool type design, other types are also used. One such design is the rotary four-way valve, which consists…

Fluid Flow

Hydraulic Flow Control Valves

Posted on January 27, 2010October 26, 2012

Flow control valves are used in constant-flow (fixed displacement pump) circuits to control actuator speed. The simplest type of flow control valve is a needle…

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