Pressure Vacuum Relief Valve By Era Technologies

A pressure vacuum relief valve, often abbreviated as PVRV or PV valve, is a safety device used to protect tanks, pipelines, and other equipment from excessive pressure or vacuum conditions. These valves are commonly employed in industries where storage tanks are used to store volatile liquids such as crude oil, gasoline, or chemicals.

Here's how they work:

1. **Pressure Relief**: When the pressure inside the tank exceeds a certain predetermined level, the pressure relief valve opens to release the excess pressure to the atmosphere. This prevents the tank from rupturing or experiencing other catastrophic failures due to overpressure.

2. **Vacuum Relief**: Conversely, when the pressure inside the tank drops below atmospheric pressure (creating a vacuum), the vacuum relief valve opens to allow air into the tank, preventing it from collapsing due to the vacuum. This is particularly important in tanks that are emptied or pumped out, as it prevents the tank from imploding.

Pressure vacuum relief valves come in various designs, including spring-loaded, weight-loaded, and pilot-operated types. They are typically installed on the tank's roof or at the highest point of the system to provide effective pressure and vacuum protection.

These valves play a crucial role in maintaining the integrity and safety of storage systems, ensuring that they operate within safe pressure and vacuum limits, and comply with regulatory standards.