What is a pressure vacuum circuit breaker?
The pressure vacuum switch (PVB) serves as a device for protection from the return flow, which prevents contaminated water from entering clean water. Return protection valves are commonly used in irrigation systems where non -formable or contaminated water circuits are powered directly from fresh water supply. This prevents water from the irrigation system to flow back into the fresh water system. To achieve this protection against return flow, pressure vacuum circuit breakers are equipped with a spring valve that is open by the pressure from the fresh water supply. If the delivery is interrupted, the vacuum vacuum switch vacuum cleaner closes and prevents the contaminated water from flowing back to the perimeter of the drinking water. These devices prevent water contaminated with chemicals, fertilizers, pesticides or animal waste from running back into a fresh water source if the situation of the return flow occurs. Backflow occurs when water supply is interrupted or reduced with the resulting pressure drop in the supply lines. This causesthat the water in the target district already sipifies back to the supply pipe in the same way that the liquid is drawn drinking. The pressure vacuum switch automatically insulates the fresh water supply in different ways if the pressure reduction stops completely.
PVBS uses a spring -packed spring valve for insulation of fresh water supply. This valve is designed to open by conventional system pressure, allowing water flow to the target circuit. If the power pressure falls completely or stops, the valve closes and the contaminated water is harmlessly undertaken to the ground. Several more complicated designs of a pressure vacuum circuit breaker also contain valves that simultaneously open to break the siphon vacuum on the supply line as added protection.
pressure vacuum circuit breaker should be installed on all hoses or water pipes used for irrigation, filling pools, delivery of chemical or fertilizers nEbo for applying pesticides. PVB should be located directly on a faucet or supply valve and should be the highest point in the system. In larger systems, PVB is usually installed on each branch or part of the contaminated water system. Since the valve will regularly vent water, it should be placed where water spills will cause no damage. Pressure vacuum cleaners should be regularly maintained and checked to wear fragments and valves and should be paid to their freezing protection.