Introduction: Ball valves shall be considered for on-off service. Ball valves for use in erosive (e.g. slurry) service etc. should be equipped with a scraper type of seat construction. Ball valves, i.e. valves without specially designed control related internals, shall not be selected for throttling service without the approval of the Principal. Unless equipped with a special trim, i.e. anti-cavitations or low-noise design, certain ball
valves may be unsuitable for high differential pressures.

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