The main difference between a safety valve and a pressure relief valve is: (a) safety valves are suited for all fluids, whereas pressure relief valves are designed to 4 operate with gases only (b) pressure relief valves are designed to operate with liquids only whereas safety valves can handle all fluids. (c) safety valves are designed for gases only and pressure relief valves will only handle liquids. (d) pressure relief valves are designed to handle gases and safety valves are designed handle only liquids. to