Turbine flowmeter

A turbine flow meter which comprises:

• a flow pipe which includes an axial through bore through which a fluid to be measured may flow;
• the through bore including a first bore section which comprises a first diameter, a second bore section which is located adjacent the first bore section and which comprises a second diameter greater than that of the first bore section, and a third bore section which is located adjacent the second bore section and which comprises a third diameter greater than that of the second bore section;
• a meter cartridge which comprises a tubular cartridge housing and a rotor which is rotatably supported in the cartridge housing;
• the cartridge housing being positioned in the second bore section against a first shoulder formed between the first and second bore sections and comprising an outer diameter which is less than the diameter of the second bore section;
• a retainer which includes a cylindrical body portion which is positioned in the third bore section against an end of the meter cartridge opposite the first shoulder, the body portion comprising an outer diameter which is less than the diameter of the third bore section;
• and
• a ring member which is secured in the through bore against an end of the retainer opposite the meter cartridge.