Back Pressure Valve

Its function is to maintain a constant pressure (back pressure), which is useful mainly when the pump starts with an empty line or when dosing into a low-pressure tank.

It works similarly to a relief valve, opening at a determined back pressure. But in this case, the liquid is relieved into the injection line instead of the storage tank.

It is usually very similar and only differs in the back pressure, which one only has two connections, an inlet and an outlet, instead of three.

Back pressure valves allow metering pumps to operate with greater precision and constant pulses; also, they can prime under start-up conditions or due to gas release events from the chemical itself.

The opening levels of a backpressure valve must be damped to avoid backpressure instabilities and to avoid valve noise.

In addition to allowing the pump to prime and stabilize the dosage, this valves act as anti-siphon protection.