10
DP17E
The DP17E (Fig. 2) is supplied as for the DP17 with a control spring but the maximum
pressure is limited to 10 bar g (145 psi g) due to the addition of the solenoid valve. A solenoid
operated valve is fitted in the pipe between the pilot valve and the main diaphragm chamber
and is thus in series with the normal pilot valve.
The purpose of the solenoid valve is to override the pilot valve thus causing the main valve
to shut-off. It can be controlled by any device capable of interrupting the supply of current
to the solenoid coil.
The solenoid is arranged to open the valve when the coil is energised so that whatever
switching device is used it must be arranged to break the current to close the main valve.
In this way the unit will always 'fail-safe' i.e. will close the main valve in the event of a failure
in electrical supply.
Electrical supply
It is important that the solenoid is connected to the correct voltage. Therefore always check
on the supply details which are stamped on the solenoid valve name-plate before attempting
to connect up.
Electrical connection is by cable plug to DIN 43650. All wiring, connectors, etc. in close
proximity to the valve should be of heat resisting type and comply with local and national
electrical codes.
Earth
The solenoid valve should be adequately earthed.
Solenoid valve
Fig. 2 DP17E
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