Pressure maintaining valves

Pressure maintaining valves relieve to pressure in the line between pump and tool but maintain a pre-selected residual pressure (closing pressure) so that the build up to operating pressure is fast the next time the tool is actuated:

 
DHV 2

DHV 2
Operating pressure:
max 1800 bar
Opening pressure: 130 bar
Closing pressure: 10 bar

DHV 4

DHV 4
Operating pressure: max 3000 bar
Opening pressure: 130 bar
Closing pressure: 60 bar

DHV 5

DHV 5
Operating pressure:
max 3000 bar
Opening pressure: 130 bar
Closing pressure: 60 bar