Use the needle valve shown in Figure 10-3 when control of fluid flow in both directions is necessary. Pressure- and temperature-compensated needle valve. Their low cost and the fact that they are tamper-proof are two main reasons for using fixed orifices. A fixed orifice can be a simple restriction in a line or a factory-preset control with pressure compensation and a bypass. Needle valve.įigures 10-1 and 10-2 show symbols for fixed orifices, rudimentary components that will control flow. The circuit examples in this chapter explain the types of flow-control systems and how to apply them. Pressure- and temperature-compensated fixed orifice.įlow controls always generate some heat in hydraulic circuits, so consider some other method of controlling actuator speed where possible. Hydraulic circuits usually have a dedicated power source sized to meet the cycle time so flow restrictors are unnecessary. Air circuits normally need controlled flow because the plant air compressor is greatly oversized for almost any given circuit. To control the speed of an actuator, most designers use flow controls.
0 Comments
Leave a Reply. |