Valve Selection for a Gas Pipeline Block Station

Описание: When a gas pipeline is installed, it is divided up using block valve stations. This enables various sections to be isolated for inspection and maintenance. The block valve is typically a full bore, soft seated ball valve to allow for scraping. However, this valve cannot be opened against full differential pressure without damage to the valve seats. Therefore a bypass is installed around the block valve and used to balance the pipeline pressure prior to opening. Plug valves should be used in the bypass as they are capable of opening and throttling against full differential pressure without damage.