Electricity + Control July 2017

VALVES + ACTUATORS

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.

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.

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 0,86 VA 1,15 VA 1,27 VA

3,4 VA 3,4 VA 3,4 VA

Ac 110 V

Ac 200 V Ac 220 V

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

Figure 2: Refreshed AV series operating principle.

Electricity + Control

JULY 2017

37