These bellows are used in installation of glass equipment for following purposes :

• to provide safe branching of pipelines from the main glass equipment.

• to accommodate odd degrees and variation in length.

Bellows are supplied along with required bellow flanges and nut-bolts. Distance-locking bolts are provided to avoid excessive compression or contraction of the bellow. Gaskets are not required where bellows are used. For drilling details, refer "Bellow flanges"

These can withstand a temperature of 200oC under normal atmospheric conditions.

   
Vacuum bellows

For pipelines of 80DN and above operating under vacuum, the bellows are provided with an internal sleeve which supports the convolutions without affecting the flexibility of the bellow. These bellows can withstand a temperature of 200oC under full vacuum. For size up to 50DN, line bellows can be used for these applications.

Cat.Ref.	DN	D	D1	D2	L	L1	t
VB3*	80	155	98	82	70	5	3.0
VB4*	100	200	132	111	70	5	3.5
VB6*	150	275	184	162	70	5	4.0
VB9*	225	350	253	230	70	5	5.0
VB12	300	420	338	308	70	5	5.0
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