Industrial Hydraulic Systems : Theory and Practice by Joji Parambath

Author:Joji Parambath [Parambath, Joji]
Language: eng
Format: azw3
Publisher: Universal Publishers
Published: 2017-04-29T04:00:00+00:00

Figure 11.1 | Circuit diagrams illustrating the concept of the flow division in a hydraulic system with a flow control valve.

Types of Flow Control Valves

Flow control valves in hydraulic systems can be of many designs. An orifice is a flow control device with a very short length of the restriction. A simple throttle valve is also a flow control device that allows restricted flow in both directions of the flow when connected in a hydraulic circuit. However, the length of the restriction in the throttle valve is comparatively long. An important variant of the throttle valve is the one-way flow control valve. It is essentially a throttle valve and a check valve in a parallel arrangement. This valve allows restricted flow in one direction and unrestricted flow in the opposite direction. Other import considerations in the use of the flow control valve are the amount of pressure drop across the valve and the effect of variations in temperature on the flow rate. Pressure-compensated and temperature-compensated flow controls allow precise volumetric flow control in hydraulic systems, irrespective of the variations in the system pressure and temperature. Figure 11.2 shows the symbols for the basic flow control valves in the fixed and adjustable modes of control. The figure also displays the symbols of many other variants of the flow control valves, such as the one-way flow control valve, the pressure-compensated flow control valve, and the orifice valve.

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