5) Which of the following components are used to prevent the leakage of a gas or fluids from valves?

6) Which component is used to manually control a valve from out side the value body?

7) In which shape three way ball valves come in fluid passageways inside the rotor?

8) If the handle is turned 90 degree between operating position the valve is called?

9) Which of the following valves has four ports equally spaced around the body?