automation studio pneumatic valve problem

Pressure- and temperature-compensated flow control. These companies say a flow control must have a bypass and be pressure-compensated as shown in Figure 10-6. However, some companies identify the flow control in Figure 10-5 as a throttle valve. This type of flow control meters flow in one direction and allows free flow in the opposite direction. Normally the term flow control refers to an adjustable needle valve with an integral bypass, as pictured in Figure 10-5. When talking about flow-control hardware, some manufacturers use different terminology.

Flow control with bypass (or throttle valve). (Remember, pressure compensation only works in one direction of flow.) Figure 10-5. These check valves, sometime referred to as bridge rectifiers, force fluid to flow through the needle valve in the same direction regardless of actuator movement. Add the check valve arrangement shown in Figure 10-4 when a needle valve needs pressure compensation in both directions. 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.

Automation studio pneumatic valve problem