A check valve is used when fluid flow needs to be restricted or regulated through the valve.

The three states of ___ are solid, liquid, and gas.

If fuel oil is not properly blended, it may stratify in a tank.

High-pressure chillers have an operating pressure greater than ___ psi.

The first thing a boiler operator should do when entering a boiler room is ___.

A ___ valve is a type of globe valve that allows a boiler to be cut in on-line automatically when the boiler pressure is at or above the header pressure.

In ANSI Standard Z400.1/Z129.1-2006, Hazardous Workplace Chemicals — Hazard Evaluation and Safety Data Sheet Precautionary Labeling Preparation, Section ___, Hazard(s) Identification includes all hazards regarding the chemical and required label elements.

An electric spark igniter is a device located at a burner that uses a small piece of silicon nitride, which produces high temperatures when electric current passes through it.

An electric spark igniter is a device located at a burner that uses a small piece of silicon nitride, which produces high temperatures when electric current passes through it.

Fuel oil characteristics include viscosity, pour point, flash point, fire point, volatility, and heating value.