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LMI 4 Function Valves are compact and economical valves that perform four important functions for your LMI pump:
Priming with the 4FV is simple and achieved by turning of the pressure relief knob (black). 4 Function Valves are a recommended accessory for every LMI electromagnetic pump.
The Four Functions: Anti-Siphon - The discharge flow path goes through a port that only opens on the discharge stroke of the pump. This prevents the discharge line from siphoning liquid from the supply tank in most applications. Back Pressure - The diaphragm that controls anti-siphoning creates approximately 20 psi (1.4 Bar) back pressure on the pump's discharge valve which improves system performance. Pressure Relief - A second diaphragm protects the pump from overpressure by releasing fluid to a relief port in the event of excessive discharge line pressure. Pressure Release - This function makes it easy and safe to depressurize the discharge line without loosening tubing or fittings.
**Valve comes with 1/2" MNPT connections. The appropriate sized tubing connection kit must be ordered separately**
