Extended body Valve bonnet is used for use in Higher temperature generally above 250°C service. This extended bonnet act as an cooling extension preventing damage to seal due to high temperature.
it is always recommended to with supplier standard.
Plain extension bonnet shall be used with control valve for operating temperatures 0°C and below to avoid choking of packing due ice formation around bonnet.
The bonnet protruded out from near service causes to increase temperature due to environment and thus avoiding choking.
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Keeps stem packing at sufficient distance away from the cold fluid to remain functional.
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Extended neck, bolted bonnet, shut-off and hand expansion valves feature an extended bonnet to allow greater insulation clearance.
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Large bonnet bolts provide exceptional strength.