FLUIDSIM QUESTION 1) Single-Acting Cylinder - Direct Control A single-acting cylinder is to clamp a component when a push button is pressed. As long as the push button is activated, the cylinder is to remain in the clamped position. If the push button is released, the clamp is to retract. The control valve used for the single-acting is the 3/2 way valve. In this case, since the cylinder is of small capacity, the operation can be directly controlled by a push button 3/2 way directional control valve with spring return. Others equipment used is Air Service Unit and Compressor.