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Subject: fully packed backseated valve valves Помогите, пожалуйста, понять и перевести "fully packed backseated block valve"."The HB50 features a fully packed and backseated block valve along with a bleed valve
with directional discharge tube and stem stop."
(http://www.valinonline.com/products/HB501S3131412) Еще из текста: Fully Backseated Bonnets
Prevent accidental stem removal and blowout. Нашел еще такое объяснение:
...a fire resistant valve that includes a secondary seal against pressurized fluid in what is commonly known as a “backseated” valve. An extended flange on the valve stem has a conical sealing surface, which when rotated upwardly engages a conical valve seat in the bonnet providing a metal-to-metal sealing arrangement which is highly useful in emergency situations when the heat from a fire will deteriorate packing and enable the pressurized flammable fluids from within the valve to escape up the valve stem. Backseating arrangements are not only restricted to emergency situations but can also be useful in sealing the valve during replacement of the bearings and primary packing. However, backseating only works when the valve is fully opened or in one position. В словаре "клапан с принудительной посадкой", но это вроде к предохранительным относится? Короче, однозначности никакой, помогите)) Спасибо.
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