Question

A Pneumatic cylinder has a bore of 200 mm and a piston rod diameter of 140 mm. For an extend speed of 5 m/min.

The retract speed is

• A. $0.814m/sec$
• B. $0.562m/sec$
• C. $0.614m/sec$
• D. $0.754m/sec$

Answer 1

The correct option is C $0.614m/sec$

$\text{The same fluid flow rate used to extend the cylinder}\text{(157 Lpm) is used to retract the cylinder.}\text{The retract cylinder velocity}\left(Vr\right)\text{is given by}{V}_r=\frac{Q_F}{A-a}=\frac{157Lpm}{\frac{\pi }{4}({0.2}^2-{0.14}^2)}=0.614m/sec$