The function of the check valves is to allow the free flow of the oil in one direction and block it in the opposite direction. The VMF-BSPP series includes check valves with GAS-BSPP M/F ports. Ball or poppet options are available for sealing. Depending on the chosen size, the valves of the VMF-BSPP series can be installed in systems with working pressures up to 400 bar (5800 PSI) and flow rates up to 150 lpm (40 gpm). The external body is made of high-strength steel and protected from corrosion by galvanizing. On demand calibrations other than standard and Zinc-Nickel surface treatment are available.