Rocker lever solenoid valve

DETAILED DESCRIPTION A solenoid valve which can be used to control a pneumatic cylinder has a magnet head 1 which lies, with the interposition of a separating foil 2, with one side against the valve housing 3 which consists of the two halves 3' and 3".
Screws (not shown) connect these two halves together as well as the valve housing 3 to the magnet head 1, which is protected by the separating foil 2 from the admission of the fluid which the solenoid valve is designed to direct to its various channels.
The magnet head 1 contains a laminated E-shaped core 4 into which two coaxially arranged exciter coils 5 wound outside the core are inserted.
The electromagnet could have only a single exciter coil.
The core 4 is located in a plastic housing 6 which leaves free only those end surfaces of the two outer legs as well as of the central leg of the core 4 which rest against the separating foil 2.
The space between these legs and the separating foil and the space between these legs and the exciter coils 5 is filled with an insulating compound 7.
Plastic housing 6 and insulating compound 7 may also be formed from a single molded block.
As shown in the figure, the valve housing 3 is provided on the side resting against the separating foil 2 with a depression the depth of which is about 40% of the dimension of the valve housing measured in that direction.
On the outside, this depression, which forms the first space or outlet chamber 8, is limited by a wall 9 of the valve housing which is directed towards the wall which abuts the plastic housing 6 and terminates flush with the outside thereof.
For providing three magnet poles 10, 11 and 12 of the electromagnet which are present in the first space, three solid strips of a material of good electric magnetizability are fastened in the valve housing 3 against the wall 9 so that their one side rests with its full surface against the separating foil 2.
The strip forming the central magnet pole 10 is of square cross section.
As shown in the figure, it is adapted to the dimensions of the central leg of the core 4 and therefore forms an extension of the central leg equal in cross section to the latter