MECHANICAL FITTER INTERVIEW QUESTIONS AND ANSWERS 1. Define Valve? Valve is a Mechanical flow control element in the process. 2. What are types of valves? · Gate Valve · Globe Valve · Ball valve · Butterfly Valve · Needle Valve · Plug Valve · Diaphragm Valve · Non-Return Valve · Knife Edge Valve · Drain Valve · Float Valve · Flush Bottom Valve · Pinch Valve · Pen Stack Valve etc. 3. Explain the valve parts? A. Gate Valve – Body, Bonnet, Seat, Gate, Stem, Hand Wheel, Gland Bush, Gland Flange, Gland Bolt and Nuts. Hand Wheel lock nut. B. Ball Valve – Body , End Piece , Ball , Stem , Seal , Seal Follower , Seat , Lock Nut , Handle Gland Packing , Gland Flange , Gland Stud and nut. C. Globe Valve – Body , Bonnet , Seat , Plug , stem , Hand Wheel , Lock Nut ,Gland Packing , Gland Flange , Gland Stud and nut. D.