A ___ is a component of a refrigerant system that controls the flow of refrigerant into an evaporator.

When a handwheel is turned to open a nonreturn valve, the stem retracts but the valve ___.

Check valves are available as swing, lift, and spring check valves.

The ___ is a nongovernmental international organization that is comprised of national standards institutions of over 90 countries.

The two types of pressure control are additive pressure control and subtractive pressure control.

A general boiler room safety rule says that when performing a bottom blowdown, the quick-opening valve should be opened first and closed last.

Electric spark igniters are controlled by combustion safety control systems.

A(n) ___ is an absorption chiller system component that vaporizes the refrigerant and separates it from the absorbent.

Gas burners can only be high pressure gas burners.

The MAWP for low pressure steam boilers is 15 psi.