- Patent JPS5427944

Document Type and Number:

Japanese Patent JPS5427944

Kind Code:

B2

Abstract:

1502880 Valves LUCIFER SA 8 May 1975 [24 May 1974] 19440/75 Heading F2V [Also in Division H1] A plunger magnetic actuator comprises a non-magnetic tube 1 retained by member 2 attached to spool valve 3 having body 4 with bore 5, in which spool 6 is slidable by the actuator to control communication between ports 7, 8; the spool having a bore 9 connecting chambers 10, 11 at each end; the latter being connected over bore 12 to port 8. An electrical winding 13 surrounds the tube within ferromagnetic cap 14 which with washers 15, 16, 17 forms a magnetic circuit completed by a twopart ferromagnetic core 18, 19 and plunger core 32. Part 18 is fixed within the tube 1 and is threaded at 20 for nut 21 securing cap 14. Part 19 is axially displaceable within part 18 by threaded end 24 engaging in threaded bore 23 and rotatable by screwdriver slot 30; a lock nut 25 retaining it and a gasket ring 26 providing a seal. A non-magnetic stop 29 is screwed into threaded bore 27 for screwdriver adjustment lockable by nut 31 and sealed by gasket ring 36. The ferromagnetic plunger core 32 is longitudinally slotted at 33 to allow passage of fluid, and is screw-connected to spool 6 against biasing spring-34 and adjustable stop 35 setting the initial position of the spool. The airgap between core and plunger is set by adjusting non-magnetic stop 29, and the operative position of plunger 32 is set by adjusting part 19 of the stationary core. The effect of these adjustments on the characteristics of the device is illustrated graphically (Fig. 2, not shown).