NF E48-440-1:1999 Hydraulic fluid power. Electrically modulated hydraulic control valves. Part 1 : test methods for four-way directional flow control valves.
1999NF E48-440-1:1999 Hydraulic fluid power. Electrically modulated hydraulic control valves. Part 1 : test methods for four-way directional flow control valves.
1986NF E48-490:1986 HYDRAULIC FLUID POWER. SERVOVALVES. TEST METHODS.