Moog D680 Series - Technical Data; Size 05 - D681 Proportional Valve

9Rev. C, April 2017
TECHNICAL DATA Moog D680 Series Proportional Control Valves
SIZE 05 - D681 PROPORTIONAL VALVE
9
TECHNICAL DATA
Rev. C, April 2017
Moog D680 Series Proportional Control Valves
SIZE 05 - D681 PROPORTIONAL VALVE
General Technical Data
Technical data and characteristic curves measured with system pressure p
p
of 210 bar (3,000 psi), oil viscosity 32 mm
2
/s
and oil temperature +40 °C (+104 °F).
Valve design 2-stage, with standard spool
Pilot valve D633 unbiased
1)
D633 biased
2)
Pilot connection X and Y Internal or external
Mounting pattern ISO 4401-05-05-0-05 with T
1
Installation position Any
Weight 8 kg (17.6 lb)
Weight including fail-safe valve 9.7 kg (21.4 lb)
Storage temperature range -40 to +80 °C (-40 to +176 °F)
Ambient temperature range -20 to +60 °C (-4 to +140 °F)
Vibration resistance 30 g, 3 axis, 10 Hz to 2 kHz
Shock resistance 50 g, 6 directions
Hydraulic Data
Operating pressure pilot valve
Minimum pressure 10 bar (145 psi) above T or Y
Operating pressure range X port 10 to 350 bar (145 to 5,000 psi)
Maximum pressure Y port
3)
70 bar (1,000 psi)
Maximum operating pressure of main stage
Port P, A, B 350 bar (5,000 psi)
Port T at Y internal
3)
70 bar (1,000 psi)
Port T at Y external 250 bar (3,625 psi)
Rated flow at Δp
N
5 bar (75 psi)/spool land 30/60/80/2 x 80 l/min (7.9/15.9/21.1/2 x 21.1 gpm)
Maximum flow 180 l/min (47.6 gpm)
Main stage leakage flow (≈ zero lap) 1.8 l/min (0.48 gpm)
Pilot leakage flow 0.4 l/min (0.1 gpm)
Pilot flow for 100 % step 6.0 l/min (1.6 gpm) 6.5 l/min (1.7 gpm)
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and ISO 11158.
Other fluids upon request.
Temperature range -20 to +80 °C (-4 to +176 °F)
Viscosity range
Recommended viscosity range at 38 °C (100 °F) 15 to 45 mm
2
/s (cSt)
Maximum permissible viscosity range at 38 °C (100 °F) 5 to 400 mm
2
/s (cSt)
Recommended cleanliness class according to ISO 4406
4)
For functional safety 18/15/12
For longer service life 17/14/11
1) Unbiased Pilot Valve for Fail-safe options W
2) Biased Pilot Valve for Fail-safe options D, F, M and U
3) Pressure peaks up to 210 bar (3,000 psi) permissible
4) The cleanliness of the hydraulic fluid strongly affects functional safety (e.g. safe positioning of the spool, high resolution) and wear
of lands (e.g. pressure gain, leak losses).