Top entry permits maintenance on the ball valve without removing the valve from the pipeline. Two piece and three piece valves are maintainable but the valve must be removed from the pipe. Welded body Bellow Seal Valvesvalves require shop service. Also, when the seats are tapered, they compensate for wear and thermal effects, and theAutomatic Control Valves differential area at the top and bottom of the ball with tapered seats loads the ball into the seats for better sealing at higher pressures. In extreme applications the top-entry bonnet, stem, ball, seats, seals, can all be assembled into a carrier, or cartridge. A cartridge-loaded valve is really close to an fire pumpsinstantly repairable valve. Pull out the bonnet bolts, snatch out the cartridge, drop in a new cartridge, and bolt 'er back down. Then you're up and running again. This isOil pumps very handy when the maintenance personnel have to limit their time in proximity to the valve due to heat, toxicity, radiation, or being deeply submerged.add a small correction on three-pieces Split case pumpsball valves: some smaller three-piece ball valves has a mid section containing the ball, section kept in place by (usually) 4 outside connecting bolts between the two end parts.

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