Patent ID: 9133950
Filing Date: 2015-09-15
Classification: E21B,F16K

Abstract:
1. A rotary servo valve for actuating a mud pulser in a drilling fluid column, comprising: a servo valve seat defining one or more drilling fluid passageways therethrough; the rotary servo valve being capable of operating in at least two rotational positions, including a first rotational position in which the rotary servo valve blocks said one or more drilling fluid passageways; and at least one rotational stop defining one of said rotational positions; said at least one rotational stop positioned wholly radially outward of said valve seat; said at least one rotational stop being an extension of a retaining structure for said valve seat; said at least one rotational stop indirectly contacting said valve seat and being in a fixed rotational orientation thereto; and an obstructing portion comprising two or more tips extending axially from said obstructing portion toward the servo valve seat.