1) The document describes various pieces of equipment that make up a typical string of wireline pressure control equipment. This includes wireline valves, lubricators, tool traps, ball check valves, grease seal flowtube systems, stuffing boxes, and flanged adapters. 2) Wireline valves are used to control well pressure by sealing around cables. Tool traps allow tools to descend into wells while preventing their ascent when closed. Lubricators provide space for tools under pressure. 3) Proper maintenance and transportation procedures are outlined for wireline valves. Level 1 and 2 services are carried out after every job and yearly, while level 3 requires stripping and rebuilding every 5 years.
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