Setting vacuum breaker vocp b type

A very specific question!

A Vacuum Breaker (VBP) is a type of valve used in plumbing systems to prevent backflow and siphonage. The VBP is typically installed on the discharge side of a pump or a water heater.

The VBP is designed to break the vacuum that can occur in the discharge piping when the pump or water heater is shut off. This vacuum can cause water to be siphoned back into the system, potentially contaminating the potable water supply.

The VBP is usually set to a specific pressure, typically around 1-2 psi (pounds per square inch), which is higher than the maximum pressure that can occur in the discharge piping. When the pressure in the discharge piping drops below the set pressure, the VBP opens, allowing air to enter the system and breaking the vacuum.

The VBP is typically set by adjusting the valve's stem or by installing a pressure-reducing valve (PRV) in series with the VBP. The PRV is set to the desired pressure, and the VBP is adjusted to open at a pressure slightly higher than the PRV's set point.

Here are the general steps to set a VBP:

1. Determine the maximum pressure that can occur in the discharge piping. This is typically done by consulting the pump or water heater manufacturer's specifications or by conducting a pressure test on the system.
2. Set the PRV to the desired pressure, which is typically 1-2 psi higher than the maximum pressure in the discharge piping.
3. Adjust the VBP's stem to open at a pressure slightly higher than the PRV's set point. The exact setting will depend on the specific VBP and PRV used, as well as the system's design and operating conditions.
4. Verify that the VBP is functioning correctly by conducting a pressure test on the system. The VBP should open when the pressure in the discharge piping drops below the set point, and close when the pressure returns to normal.

It's important to note that the specific setting of a VBP may vary depending on the system's design, operating conditions, and local plumbing codes. It's recommended to consult with a qualified plumber or engineer to ensure that the VBP is properly set and functioning correctly.