Selecting a Valve by Application Bellows Seal Globe valves

Leakage at various points in pipelines found in chemical plants creates emissions.

All such leakage points can be detected using various methods and instruments and should be noted by the plant manufacture. Critical leakage points include flanged gasket joints along with the Valve pump gland packing etc. Today the chemical process industry is gearing itself towards safer technology for better environmental protection and it has become every process engineers responsibility to design plants to limit damage to the environment through the prevention of leakage of any toxic chemicals. Bellows Sealed Gate Valve VALVOLA Bellows Sealed Gate Valve LEAKAGE From the VALVE GLAND OR STUFFING BOX is normally a concern for the maintenance or plant engineer.

This leakage means a loss of revenue of material b Pollution to the atmosphere c Dangerous for plant employees. For example take the case of a steam leakage through the Valve gland. At PSI a clearance of just that. through the gland will mean a leak at the rate of lbhour. This equates to an involving USD . per eight hour shift or USD per year. Similarly a tiny drop of .

mm diameter per second results in a waste of about litres every of costly oil or solvent. This leakage could be reduced considerably by when using the bellow seal Valve. The following paragraphs will now consider the construction and operation of the bellow seal. BELLOW CONSTRUCTION The bellow cartridge is welded to both the Valve Bonnet and the Valve stem. The bellow cartridge has a connected with convolutions and these convolutions become compressed or expanded depending upon the movement of Valve stem. Scientifically speaking the bellow gets compressed when the Valve is in the open position and expanded as soon as the Valve is in the closed condition.

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