Perkins Limited

David Roy Withers

Colin John Wilson

Ewan Stuart Bewley

A method of operating a two-coil solenoid valve of the type including an armature member located in a housing for movement between a first electromagnet and a second electromagnet, each electromagnet being located adjacent to a respective end of the armature member and being switchable between an on state and an off state. In order to move the armature member from a first position closely adjacent to the first electromagnet to a second position closely adjacent to the second electromagnet, the electromagnets are controlled to be at the same initial switched state and subsequently one of the electromagnets is switched to the other switched state for a first predetermined period sufficient to allow the resultant pull exerted on the armature member to be such that the armature member is caused to move towards the second electromagnet. The duration of the first predetermined period is such that the one electromagnet is switched back to its initial switched state before the armature member reaches the second position.

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Cambridgeshire, United Kingdom

David Roy Withers