A secondary sealing system over the bellows prevents leakage even if the bellows seal fails, 

Working pressures up to 2500 psig (172 bar), 

Operating temperature range -28°C to 648°C, 

Ferrules, threaded and welded ports available, 

Port sizes: 
1/4-1in,
6-25mm, 

Multiple tip styles available, 

Ball and pin design ensures reliable stem retraction, Bellows available in gasket seal and welded seal. Ball and double pin design ensures reliable stem retraction. 

Bellows are available with gasketed or welded seals.