SKILL $2$A

DESIGN A CIRCUIT TO PROVIDE BYPASS FLOW

PROCEDURE OVERVIEW

In this procedure, you will design a circuit that will use a check valve in a basic application.

NOTE

If working on the $850-$HD$1,$ record any measurements when only one shutoff valve is open. Otherwise, your measurements will not be those expected.

Complete the design of the circuit shown in figure $2a-1$ so the cylinder can be reciprocated with a directional control valve. The cylinder should extend at a slow speed $($adjustable by the needle valve$)$ and retract at a high speed.

Connect your circuit design on the $850$ Series trainer using the small bore cylinder.

Perform the power unit checkout procedures.

Turn on the power unit and increase the relief valve's pressure setting to $300\frac{}{2070}$kPa.

Open the shutoff valve.

Close the needle valve completely. Then open it $\frac{1}{2}$ turn.

This will set the needle valve for a slow cylinder speed.