Phcc Ch 12: Valves

What type of open-close valve is used to completely close a line so piping or equipment can be isolated for repair, inspection, or replacement?

• gate

• ball

• butterfly

• plug

What type of flow regulation valve provides a fine adjustment of low flow volumes to control instrument, meter line, or gauge piping?

• globe

• needle

• check

• ball

What type of flow regulating valves are designed to allow unrestricted flow in one direction and to prevent flow in the opposite direction?

• globe

• needle

• check

• ball

What type of valves are designed to receive high pressure at the inlet and automatically maintain a constant lower pressure at the outlet?

• open-close

• flow regulation

• relief

• automatic pressure reducing

What type of valves are designed to operate when the normal operating controls of the system malfunction in some manner?

• open-close

• flow regulating

• relief

• automatic pressure reducing

What type of specialty valve is used to mix hot and cold fluids in order to achieve a specific mixed temperature?

• tempering

• solenoid

• diaphragm

• spring-loaded

The valve used to admit air into a system in the event that a hazardous less-than-atmospheric pressure is developed in the system is called a

• solenoid.

• diaphragm.

• combination temperature and pressure.

• vacuum relief.

What type of specialty valve is normally a very small stop valve?

• diaphragm

• solenoid

• tempering

• relief

If a valve is marked WOG on the body, what does this mean?

• It is suitable for use with water, oil, or gas at 70° F.

• It is suitable for saturated steam pressure.

• The flow direction runs from left to right.

• The flow direction runs from right to left.

A check valve arranged and trimmed for installation in a drain line that is used to control backflow is a

• needle valve.

• gate valve.

• backwater valve.

• diaphragm valve.