Nachi-Fujikoshi : PVS-0B, PVS-1B, PVS-2B

PVS Series Variable Volume Piston Pumps 8.0 to 45.0cm3 /rev 21MPa
Energy-saving Type with Drastically Reduced Loss
A NACHI-proprietary semi-circular barrel swash plate that receives pressure
on its surface ensures a stable discharge volume at all times. This eliminates excess discharge volume, and enables the effective use of power corresponding to the load cycle.
This "energy-saving type" conserves energy, reduces power loss, and helps
to reduce hydraulic costs. Silent Type That Demonstrates Its Power Quietly
Proprietary low-noise mechanisms are incorporated on the shoe, swash plate,
valve plate, and other locations to ensure silent operation. In particular, a
semi-circular barrel swash plate stabilizes operation characteristics to ensure
silent operation.