johnma
Guru
if your pressure stays at 1200 psi you have a variable volume pump. the math still works. with a fixed displacement pump working in standby the oil flows through a control valve and back to tank at low pressure ( 6 gpm x 20 psi / 1714 = .07 hp). with a variable displacement pressure compensated pump in standby you have high pressure a zero flow
( 0 gpm x 1200 psi / 1714 = .7 hp). they now use load sense pumps that in standby give you zero flow at 200 psi ( 0 gpm x 200 psi / 1714 = .11 hp.). The fixed pump has the lowest horsepower draw in standby, the highest horsepower draw when working. the variable pressure compensated pump has higher in standby but better in working mode. The loadsense pump gives the best all around; very low in standby and extremely low when working.
Almost all new construction machines today use loadsense. It's all about fuel savings. Your Vickers pump is probably a PVB6 series.
My company is the Eaton Vickers distributor for the east coast.
John
MS390
( 0 gpm x 1200 psi / 1714 = .7 hp). they now use load sense pumps that in standby give you zero flow at 200 psi ( 0 gpm x 200 psi / 1714 = .11 hp.). The fixed pump has the lowest horsepower draw in standby, the highest horsepower draw when working. the variable pressure compensated pump has higher in standby but better in working mode. The loadsense pump gives the best all around; very low in standby and extremely low when working.
Almost all new construction machines today use loadsense. It's all about fuel savings. Your Vickers pump is probably a PVB6 series.
My company is the Eaton Vickers distributor for the east coast.
John
MS390