Fluid handling – Systems – Multi-way valve unit
Patent
1997-01-08
1999-02-09
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762524, 251283, F15B 13044
Patent
active
058681655
ABSTRACT:
A rotary servovalve having a cylindrical spool (18), which rotates through a limited angle, positioned within a housing (16). The spool and housing have transverse holes through both parts with matching position and diameter. The holes in the housing form cylinder ports (21) and (24) for connection to a load. A metering pin (22) is fixed in the opening in the spool and its end surfaces conform to the surface of the spool. These end surfaces block the opposed load ports (21) and (24) when the valve is in the null position. Fluid under pressure and exhaust are applied through the inlet port (20) and return (11) ports to circumferential grooves (23) and (25) on opposite sides of the metering pin, which are narrower than the diameter of the pin. When the spool is rotated, pressure is connected to one of the load ports and return to the opposite port and the resulting flow is proportional to the angle of rotation. The valve is manufactured by positioning the spool, with the groove pre-formed, at the desired point in the housing and clamping them together. A hole is then bored simultaneously through both parts. The metering pin is then sized, inserted into the spool, fixed in place, and its ends are ground to conform to the clindrical surfaces of the spool and the housing.
REFERENCES:
patent: 2806485 (1957-09-01), Collins et al.
patent: 2917080 (1959-12-01), Hatch
patent: 2946348 (1960-07-01), North
patent: 4177834 (1979-12-01), Bonney
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