Zero pressure electromagnetic server

Details Zero pressure electromagnetic server Zero pressure electromagnetic server

2005-01-11

2005-01-11

Look, Edward K. (Department: 3754)

Valves and valve actuation

Electrically actuated valve

Balanced valve

C251S282000

Reexamination Certificate

active

06840498

ABSTRACT:
A zero pressure electromagnetic server mainly includes an electromagnetic controlling valve stem. The valve stem has two sealing sides of the same area to seal respectively two valve openings. The valve stem has an axial flow opening to channel the positive pressure to the two sealing sides to generate a thrust force and a bucking force opposite to each other for offsetting. Thus the valve stem has no loading and a spring completely controls the closing of the valve. An electromagnetic coil is provided to control the opening size of the valve opening so that accurate conveying quantity may be achieved.

REFERENCES:
patent: 3572382 (1971-03-01), Luthe
patent: 6330880 (2001-12-01), Okada et al.

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