Wear resistant vibration assembly and method

A wear resistant vibration assembly for transmitting a pressure pulse in a drill string, comprising:

• a positive displacement power section disposed in an inner bore of a housing, the positive displacement power section including a rotor disposed at least partially within a stator, wherein the rotor is configured to rotate within the stator upon a fluid flow through the positive displacement power section;
• and
• a valve disposed above the positive displacement power section within the inner bore of the housing, the valve including a rotating valve segment disposed below a non-rotating valve segment each including at least one fluid passage, wherein the valve further includes an inner sleeve disposed around the non-rotating valve segment and an outer sleeve disposed around the inner sleeve, wherein the outer sleeve is rotationally locked to the housing, wherein the inner sleeve and the outer sleeve each includes a cooperating alignment mechanism configured to allow relative axial sliding and to prevent relative rotation between the outer sleeve and the inner sleeve;
• wherein the rotating valve segment is configured to rotate relative to the housing with a rotation of the rotor for cycling the valve between an open position and a restricted position, wherein in the open position the fluid passage of the rotating valve segment is aligned with the fluid passage of the non-rotating valve segment, wherein in the restricted position the fluid passage of the rotating valve segment is at least partially unaligned with the fluid passage of the non-rotating valve segment for restricting the fluid flow through the valve to generate and transmit an unobstructed pressure pulse through the drill string above the valve.