Mounting and Installation Notes D941/2/3/4 (B97072-941-001; Version G, 02/15)
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User Manual
Mounting and Installation Notes
D941/2/3/4 Series – pQ-Proportional Valves
1 Safety
Handling the valves/ machines
Occupational safety and health
2 Hydraulic Fluid
Mineral oil based hydraulic fluid according to DIN 51524,
parts 1 to 3, (ISO 11158).
Other hydraulic fluids on request.
Viscosity: 5…400 mm²/s, recommended 15…45 mm²/s.
Temperature range: Ambient T
A
–20…60 °C (68…140°F),
fluid T
F
–20…80 °C (68…178°F).
Class of cleanliness: According to ISO 4406:1999 at least
class 19/16/13; for longer life, class 17/14/11 recommended.
The cleanliness of the hydraulic fluid greatly influences the
functional safety and the wear and tear. In order to avoid mal-
functions and increased wear and tear, we recommend filtrat-
ing the hydraulic fluid accordingly.
Flushing instruction:
Use of flushing plates or flushing valves
according to the machine manufacturer’s instructions.
WARNING
Carrying-out work on the valves/ machine during
operation
Carrying-out any work during operation, such as e.g.,
hydraulic connection of components, can cause un-
controlled sequences of motions, malfunction, and
others, and thus may result in fatalities, serious per-
sonal injuries and serious damage to property.
During operation, do not carry out any work on the
valves/ machine.
Before working on the valves/ machine, stop the
machine and switch off the supply voltage.
Secure the machine against restarting. Examples
of suitable securing measures:
• Lock the main command device and remove
the key.
• Attach a warning sign to the master switch.
WARNING
Hydraulic fluid squirting out
Hydraulic fluid squirting out under high pressure or
parts falling off can cause serious personal injuries,
burns and fires.
Before working on the valves/machine, depres-
surize all hydraulic lines and accumulators.
When mounting the valves, observe the specifica-
tion of the installation screws and the mounting
pattern and ensure the presence, elasticity, integ-
rity and correct seating of the O-rings.
Observe the maximum operating pressure.
Please pay attention for signs, such as a slight oil
leak or "sweating", which may indicate an assem-
bly error and/or component failure.
WARNING
Wrong handling
Wrong handling of the valve, tools or accessories
may result in fatalities, serious personal injuries and
serious damage to property.
Only properly qualified and authorized users may
work with and on the valves.
When working with and on the valves/machine,
observe the machine manufacturer’s notes and in-
structions.
CAUTION
Transport with hoisting devices (only for D943/4)
The valve may fall down if the hoisting devices are
not attached properly to the valve. This may result in
personal injuries and serious damage to property.
Screw the ring bolt completely into the threaded
hole (size M8) at the valve’s end cap.
Attach the hoisting devices to the ring bolt.
CAUTION
Misuse of the connectors, mating connectors
(plugs) and connection cables
Misuse, such as e.g., use as foot hold or transport fix-
ture, can cause damage and thus may result in per-
sonal injuries as well as further damage to property.
Use the connectors, mating connectors and con-
nection cables exclusively for the connection of
the valve.
CAUTION
Falling objects
Falling objects, such as e.g., valves, tools or acces-
sories, may result in personal injuries and damage to
property.
Wear suitable safety equipment, such as e.g.,
safety shoes or helmet.
CAUTION
Hot surfaces of valves and hydraulic lines
Valves and hydraulic lines can become very hot dur-
ing operation. Contact may result in burns.
Wear suitable safety equipment, such as e.g.,
work gloves.
CAUTION
Noise emission
Depending on the application, significant levels of
noise can be generated when the valves are oper-
ated. This may result in hearing damage.
Wear suitable safety equipment, such as e.g., ear
protection.
CAUTION
Skin contact with hydraulic fluid
Skin contact with hydraulic fluid may result in per-
sonal injuries.
Observe the safety regulations applicable to the
hydraulic fluid used.
Wear suitable safety equipment, such as e.g.,
work gloves.
