Valves Types

The type of valve stem suitable for use with corrosive liquids is the _____.

• nonrising stem
• outside screw and yoke
• rising stem
• inside yoke and screw

A valve that provides an unrestricted flow through the operation of a flow control element thatretracts until the passage is clear is a _____.

• throttled flow valve
• full flow valve
• check valve
• straight-through flow valve

If a gate valve shows signs of wire drawing, _____.

• clear the valve body of foreign material
• repair the disc
• repair the valve handle
• replace the valve

Which of these statements about gate valves is true?

• They cause severe pressure drop
• They are easy to automate
• They provide throttled flow control.
• They provide an unobstructed passageway.

Ball valves operate with a _____.

• half turn
• three-quarter turn
• quarter turn
• complete turn

Which of the following valves should be chosen for an application that requires flow to be throttledand regulated?

• Gate valve
• Pressure regulator valve
• Swing-check valve
• Globe valve

Most valves used in cryogenic applications are made from _____.

• stainless steel
• cast iron
• plastics
• ceramics

Brass is an alloy of copper and _____.

• molybdenum
• zinc
• aluminum
• steel

If it will take a long time to locate the water shutoff valve upstream from a leak, _____.

• shut off the main water supply to the entire building
• direct the leak into a suitably sized container
• place rags, towels, or other absorbent materials underneath the leak
• cover furniture, floors, and equipment to protect them from water damage