Patent ID: 6892818

Claim:
A pressure reducing assembly for a high pressure well comprising a housing formed of a metallic material, said housing having an upstream channel, a downstream channel, and a central channel that interconnect with each other; a first ceramic liner disposed in said upstream channel for lining the internal surface of said upstream channel; a second ceramic liner disposed in said downstream channel for lining the internal surface of the downstream channel; a third ceramic liner disposed in said central channel for lining the internal surface of the central channel, said third ceramic liner having an orifice formed therein that is positioned and dimensioned to align substantially coaxially with said first ceramic liner for providing a flow path between said upstream channel and said central channel; a ceramic pressure reducing insert disposed in said third ceramic liner, said ceramic pressure reducing insert having an inlet orifice formed therein that is aligned substantially coaxially with the orifice in said third ceramic liner and being fixed against axial and rotational movement relative to said third ceramic liner; and means for providing access to said central channel to facilitate insertion or removal of said third ceramic liner and said ceramic pressure reducing insert.