the basic function of the flow control valve
The basic function of the flow control valve is to reduce the volume of oil supplied in different places in a hydraulic circuit. Is a device used for adjusting or manipulating the flow rate of a liquid or a gas in a pipeline. The valve contains a flow passage or a port whose flow area can be varied. The role of the valve in a hydraulic circuit is very important and its very location is critical to optimum system performance.
An important application of this valve in hydraulic systems is: controlling the flow rate to cylinders and motors to adjust their speeds. Any flow decrease it means a speed decrease at the actuator.
Also builds added resistance to the circuit, increasing pressure, resulting in a partial bypassing of fluid over the relief valve or a de-stroking pressure of a compensated pump. This reduces flow downstream of the valve.
These valves are non-adjustable (fixed) or adjustable.
Additionally they may also be classified as: throttling or needle valve and pressure compensated.
Throttling or needle valves are good metering devices as long as the pressure differential across the valve remains constant.
A pressure compensated valve is designed to make allowances for variations in pressure, before or after the orifice. Pressure-compensated valves are used in order to produce a constant flow rate. A valve of this type maintains an almost constant pressure drop across a fixed orifice to produce a constant flow rate. These valves have the tendency to automatically adjust to changes in pressure.In a pressure-compensated valve, the actuator speed does not vary with variation in load.
Non-compensated valve are used where precise speed control is not required, since the flow rate varies with the pressure drop across the valve.
More products of valves
2012-08-03
