The two types of PRV's are ______.

The two types of PRV's are ______.

• A. Two-way and three-way
• B. Indirect and direct
• C. Opened and closed
• D. Pilot operated and direct operated

Answer: (D)

Pressure relief valves are categorized by how they are opened. The two main types are direct-operated and pilot-operated. A direct-operated PRV uses the system pressure itself to push against a spring and open the valve once the set pressure is reached. It’s simple, compact, and responds quickly, making it a good fit for lower-flow, moderate-pressure situations. But its ability to relieve large flows is more limited. A pilot-operated PRV uses a small pilot valve to sense pressure and control the opening of a larger main valve. The pilot valve essentially acts as a controller that allows the main valve to open, which enables relief of much higher pressures and larger flows with stable settings. This setup is more complex but better suited for high-flow or high-pressure circuits. The other terms describe configurations or states rather than the actuation method of the valve, so they don’t fit as the main categories for PRVs.

Pressure relief valves are categorized by how they are opened. The two main types are direct-operated and pilot-operated. A direct-operated PRV uses the system pressure itself to push against a spring and open the valve once the set pressure is reached. It’s simple, compact, and responds quickly, making it a good fit for lower-flow, moderate-pressure situations. But its ability to relieve large flows is more limited.

A pilot-operated PRV uses a small pilot valve to sense pressure and control the opening of a larger main valve. The pilot valve essentially acts as a controller that allows the main valve to open, which enables relief of much higher pressures and larger flows with stable settings. This setup is more complex but better suited for high-flow or high-pressure circuits.

The other terms describe configurations or states rather than the actuation method of the valve, so they don’t fit as the main categories for PRVs.