Multi Function Valve For Chemical Dosing Pump The new multifunction valve, MFV, extends your metering pump to provide critical functionality such as back pressure, pressure relief, priming and other key functions into a single valve. The integrated design mounts directly on the liquid end of the pump as a cost effective solution to address common challenges in chemical metering applications. Features & Benefits: Performance: Back pressure improves system performance by providing constant pressure against the pump. Pressure Relief protects the pump from overpressure by releasing fluid through a relief port in the event of excessive discharge line pressure. Safety: Anti-Siphon prevents the discharge line from syphoning liquid from the supply tank in most application. Burp eliminates the valve’s back pressure allowing the pump to run at atmospheric pressure.