MSG11-5715-662 DCV UK.indd 21.07.22
Directly operated and pilot operated directional control valves
Series D1VW / D1DW / D3W / D3DW / D31DW / D41VW / D81VW / D91VW
8
Translation from German
Parker Hannin Corporation
Temperature
The surface of our product may heat up in use.
The service temperatures may exceed
the temperature threshold for burn injury,
70 °C. Above this threshold, even brief
contact with the surface may result in a
burn.
The only way to consistently prevent
burn injuries is to use personal protec-
tive equipment and to remain safety-
conscious at all times.
If integrated electronics are exposed to
a temperature above 80 °C, they may
malfunction.
Power failure
In a power failure the valve piston returns
to the spring centred starting position.
You must check whether this creates
potential hazards when the system/
machine is used.
Hydraulic
DCV are tested and approved with an even ow.
If the ow becomes asymmetrical, the safety func-
tion of the valve may be compromised. You should
therefore carry out tests before commissioning to
verify that the valve is in good working order.
If the valve piston has been under pressure and
stationary in the end position for an extended pe-
riod, oil particles may cause the piston to seize. For
this reason the valve should be actuated regularly.
Electrical connection for position control
The position control can be connected as normally
closed or normally open. In principle, we recom-
mend a normally closed connection, as this is the
only way to ensure that position control works
properly
4. Correct use
Our products are manufactured using state of the
art technology and recognised safety procedures.
The DCV valves are designed for mould closing
devices in injection moulding machines according
to the manufacturer's installation instructions (see
section 8. "Installation instructions DCV" and sec-
tion 16. "Position control switch").
According to section 1(2b) of accident prevention
guidelines "Injection moulding machines" (VGB
7 ac) and section 5. of DIN EN 201:2009 "Injec-
tion moulding machines. Safety requirements", the
valves must be independently monitored by the
control system of the injection moulding machine,
such that if position control fails, a new machine
cycle is prevented from starting.
5. Function
The DCV valves are devices that inuence the
direction of a ow. To do this, connections between
the various ports are made or broken. Activating
the solenoid or the hydraulic pilot causes the piston
in the valve to move to the end position.
If the electrical signal is removed, the installed
spring pushes the piston back to its starting posi-
tion.
The purpose of the installed position control is to
detect when the piston is in the starting position.
6. Transport
The low weight of the product means that no lifting
equipment or transport aids are needed.
Our product leaves the factory in perfect working
order, and appropriate packaging is used to protect
it from damage.
The condition of the product on arrival
is no longer under our control, so please
check for transport damage/defects im-
mediately after arrival.
Document the transport damage and im-
mediately notify the carrier, the insurance
company and the manufacturer.
Do not dispose of the packaging unless
• there is no transport damage
• the entire package contents have been
removed from the packaging.
If the product has been damaged during
transport, it must be exchanged for a new
one.
When transporting the product within your prem-
ises, make sure it is kept in a safe position and
protected in its original packaging until it is ready
to use.
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