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Piping Design Engineer Interview Questions Part-10 (Valves-IV)

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31. What is paper-stock valve?
A single disc single seat gate valve (slide gate) with knife edged or notched disc used to regulate flow of paper slurry or other fibrous slurry.
32. What is root valve?
A valve used to isolate a pressure element or instrument from a line or vessel, or a valve placed at the beginning of a branch form the header.
33. What is slurry valve?
A knife edge valve used to control flow of non-abrasive slurries.
34. What is spiral sock valve?
A valve used to control flow of powders by means of a twist-able fabric tube or sock.
35. What is throttling valve?
Any valve used to closely regulate flow in the just-open position.

36. What is vacuum breaker?
A special self-acting valve or nay valve suitable for vacuum service, operated manually or automatically, installed to admit gas (usually atmospheric air) into a vacuum or low-pressure space. Such valves are installed on high points of piping or vessels to permit draining and sometimes to prevent siphoning.
37. What is quick acting valve?
Any on/off valve rapidly operable, either by manual lever, spring or by piston, solenoid or lever with heat-fusible link releasing a weight which in falling operates the valve. Quick acting valves are desirable in lines conveying flammable liquids. Unsuitable for water or for liquid service in general without a cushioning device to protect piping from shock.
38. What is diverting valve?
This valve switch flow from one main line to two different outlets. WYE type and pneumatic control type with no moving part.
39. What is sampling valve?
Usually of needle or globe pattern, placed in branch line for the purpose of drawing all samples of process material through the branch.
40. What are blow off valve?
It is a variety of globe valve confirming with boiler code requirements and specially designed for boiler blow-off service. WYE pattern and angle type, used to remove air and other gases from boilers etc.

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