Fluid handling – Systems – Multi-way valve unit
Patent
1997-04-01
1998-07-28
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
137238, 137339, 137554, F15B 13044
Patent
active
057850879
ABSTRACT:
A water hydraulic proportional control valve comprising: a valve body having a supply port, a control port and a return port; a spool axially movably disposed in the valve body for changing a direction of the working fluid and a flow rate of the working fluid; a direct driving mechanism which directly converts electric signals into a driving force for moving the spool, the valve opening of the control valve is controlled by means of a proportional control of the amount of a displacement of the spool from a neutral position thereof toward one direction or another according to an input signal supplied to the direct driving mechanism; spool side chambers provided on both sides of the spool; and drain channels formed in communication to each of the spool side chambers; wherein a water is used as the working fluid, and a flow passages is provided for introducing a pressurized fluid into said spool side chambers, whereby water filling the chamber is constantly replaced by a fresh water thereby preventing generation of microorganisms and decay of the water.
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Takahashi Tamami
Usami Yuichi
Ebara Corporation
Michalsky Gerald A.
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