Valve means for compressed air powered acoustic pulse generator

Details Valve means for compressed air powered acoustic pulse generator Valve means for compressed air powered acoustic pulse generator

1982-01-04

1984-12-04

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

124 56, 181117, 181401, G01V 1147

Patent

active

044858892

ABSTRACT:
A movable inner cylindrical valve member is rigidly attached to the upper end of an air powered impact projectile designed for striking a target to produce an acoustic pulse. By seating upwardly within the bore of a fixed outer valve member against spaced apart tapered valve faces, the cylindrical wall of the inner valve member covers intermediate air pressure ports in the bore wall. In operation, the axial separating movement between the inner and outer valve members will instantly admit air pressure adjacent the closed end of the bore of the outer valve member in order to exert an accelerating force to drive the projectile. At the same time, the operation of this valve can be made essentially pressure independent by proper selection and placement of the annular seals which contact the valve faces.

REFERENCES:
patent: 928181 (1909-07-01), Clement
patent: 1053304 (1913-02-01), Gendre
patent: 4284165 (1981-08-01), Airhart et al.
patent: 4402381 (1983-09-01), Airhart

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