OVERFLOW VALVE Russian patent published in 1995 - IPC

Abstract SU 1797293 A1

FIELD: drilling equipment. SUBSTANCE: overflow valve has hollow body with radial holes, inner flange with upper seat, plate with rod and lower seat. Attached to flange is sleeve filled with oil. Secured to rod is thrust washer spring-loaded relative to flange. Washer is located in sleeve in a spaced relation to its inner surface. Thrust washer has longitudinal channels. Attached to rod under washer is flexible collar overlapping washer longitudinal channels. Inner surface of sleeve in zone of washer motion is of variable diameter. EFFECT: higher efficiency. 4 dwg

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SU 1 797 293 A1

Authors

Shajdakov V.V.

Kravtsov A.I.

Mavljutov M.R.

Akchurin Kh.I.

Sharipov N.B.

Dates

1995-03-10—Published

1989-09-05—Filed