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Patent Searching and Data


Title:
NOZZLE FLAPPER SERVO VALVE
Document Type and Number:
Japanese Patent JPS5774275
Kind Code:
A
Abstract:

PURPOSE: To prevent uncomfortable throttling noise generating just before the valve seat is closed by forming the face of either one side of the jet port or valve seat facing to the jet port of the flapper type servo valve to be recessed.

CONSTITUTION: Making the surface of the valve seat 25, 26, which correspond to the jet ports 20, 21 of a flapper type servo valve device, to an approximately circular concave surface, making the gap h0 at near the center larger than that at the circumference h2. Therefore, when valve seats 25, 26 act to close jet ports 20, 21, and the confornting gap of valve seat 25, 26 and jet port 20, 21 becomes closer; by way of the concaved portion formed to either one of the valve seat 25, 26 or jet port 20, 21, pressure of the fluid flowing in the vicinity of the center of the concaved portion becomes larger than that at the periphery and eliminate the separation of the fluid flowing there and can restrict occurrence of cavitation.


Inventors:
Inaguma, Yoshiharu
Application Number:
JP1980000150210
Publication Date:
May 10, 1982
Filing Date:
October 28, 1980
Export Citation:
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Assignee:
TOYODA MACH WORKS LTD
International Classes:
B62D5/08; B62D5/06; B62D5/24; (IPC1-7): B62D5/06