Interchangeable choke assembly

A pressure reducing assembly, comprising:

• A. a hollow body having an upstream channel, a downstream channel and a central flow channel between the upstream channel and the downstream channel;
• B. a first liner disposed in the upstream channel;
• C. a second liner disposed in the downstream channel;
• D. an outer sleeve disposed in the central flow channel and having an internal bore;
• and
• E. a first inner sleeve disposed in the internal bore of the outer sleeve and having a first internal configuration,
• wherein the first inner sleeve is removable from the internal bore of the outer sleeve and interchangeable with a second inner sleeve configured for insertion in the internal bore of the outer sleeve, said second inner sleeve having a second internal configuration.

A method for operating a pressure reducing assembly, comprising the steps of:

• A. providing a pressure reducing assembly having a hollow body and a central flow channel formed therein;
• B. placing a wear resistant outer sleeve formed of a ceramic material in the central flow channel;
• C. inserting a first inner sleeve in the outer sleeve, said first inner sleeve being operable to discharge oil from the pressure reducing assembly at a first pressure and a first flow rate;
• and
• D. removing the first inner sleeve from the outer sleeve and replacing the first inner sleeve with a second inner sleeve, said second inner sleeve being operable to discharge oil from the pressure reducing assembly at a second pressure and a second flow rate.

A flow control assembly, comprising:

• A. a hollow body having an upstream channel, a downstream channel, and a central flow channel between the upstream channel and the downstream channel;
• B. a first liner disposed in the upstream channel;
• C. a second liner disposed in the downstream channel;
• D. an outer sleeve disposed in the central flow channel and having an internal bore;
• and
• E. an inner sleeve disposed in the internal bore of the outer sleeve.