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Electricity
+
Control
JULY 2017
continually encourages customers to discuss their
requirements that may end up in the development
of a new or improved solution through our NPDP
process. Some of the features of the refreshed
soft-start valve now include:
• Energy Saving: Power consumption has been
reduced by up to 80%
• Prevents air leakage when the main valve is
switched
• Additional options: with Bracket
o Built-in Silencer
o Gauge
• 1(P) → 2(A) Improved in flow characteristics by up
to 2,3 times
• IP65 Pilot Valve Enclosure (DIN terminal only)
• Improved needle adjustability during low
speed air supply
Reduced power consumption
When the pilot valve was changed from the SF4 to
the V115, power consumption was greatly reduced.
Depending on the rated voltage, a maximum of
80% worth of power savings can be realised when
using the refreshed AV series. This is an impressive
saving to the customer as we often find that these
valves tend to be energised for long periods of time.
Power consumption：
Reduced up to 80%(Dc 12/24V)
Rated Voltage
New
Current
Dc 12/24 V
0,35 W
1,8 W
Ac 100 V
0,78 VA
3,4 VA
Ac 110 V
0,86 VA
3,4 VA
Ac 200 V
1,15 VA
3,4 VA
Ac 220 V
1,27 VA
3,4 VA
Table 1: Pilot valve changed from the SF4 to V115.
Operating principle
Figure 2
explains... When you switch the valve (pi-
lot valve is on), the spool is pushed down by the
pilot air and comes into contact with main valve
to close the flow passage to the exhaust (R) port.
At this time, the force that pushes the main
valve closed is more than force the pushes down
the spool, therefore the flow passage from the
main valve to port 2 remains closed. “The sec-
ondary piston is now pushed down due to the pi-
lot air and the flow passage from the needle valve
to port 2 opens thereby gradually pressurising the
downstream circuit. Here you can control the rate
at which air flows into 2 port at this point by con-
trolling the needle valve.
When the outlet side becomes pressurised
with air supplied via the needle valve, the pres-
sure on this side is now higher than the force
that keeps the main valve closed. The main valve
opens the flow passage from inlet port P to work-
ing port A to rapidly supply air.
When the AV soft start valve is to be turned off,
firstly the pilot valve is turned off, the pilot air of
the spool is exhausted from this valve so that the
spool and main valve are pushed up via the spring
force to close the flow passage. This in turn opens
Any
application
requiring a
safe, smooth
and more
controlled start
would benefit
from using the
AV series.
VALVES + ACTUATORS
Figure 2: Refreshed AV series operating principle.