PWM electromagnetic valve with selective case hardening

Details PWM electromagnetic valve with selective case hardening PWM electromagnetic valve with selective case hardening

1988-03-15

1989-01-10

Rosenthal, Arnold

Valves and valve actuation

Electrically actuated valve

Including solenoid

25112921, 251368, F16K 3106

Patent

active

047968559

ABSTRACT:
The armature and active seat of an electromagnetic PWM valve are selectively case hardened at their contacting surfaces to a case depth of approximately 0.50 mm. The hardened areas provide hard contacting surfaces for superior durability, and moreover, create an effective air gap between the armature and the active seat to substantially prevent residual magnetism therebetween. The remaining surfaces of the armature and seat assembly are not hardened, and serve as a low reluctance magnetic flux path around the hardened areas.

REFERENCES:
patent: 3683965 (1972-08-01), McClure et al.
patent: 4231525 (1980-11-01), Palma

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