Vanstone Flanges On Bellows Expansion Joints

Vanstone Flanges On Bellows Expansion Joints

Van Stone Bellows
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A new twist on an old product
Sometimes there are such great ideas that when you see them you think “I could’ve thought of that”. The ideas I put in that category are – the wrist rocket, the slap chop, TiVo, and the van-stone flange. I could’ve thought up all of those… OK, maybe not TiVo – but definitely the other three.

Field fit-up
A van stone flange is fabricated by lapping the ‘neck’ or tangent of a bellows over the flange face. This allows the flange to rotate prior to tightening the bolting.
Piping can settle or shift, resulting in misaligned mating flanges. During installation, Van Stone flanges will rotate until aligned. In addition there is often a small gap (up to 1/8″) between the flange ID and bellows tangent allowing additional misalignment adjustment.
Also use the link below to go directly to our 2 minute video on van stone flanges.

Corrosion protection
Another bonus is the flange does not see the media. The bellows is the entire wetted surface. Applications that call for all stainless steel components, due to corrosive media, can use less expensive carbon steel flanges with a stainless van stone bellows.
One note of caution – the van stone surface creates a raised face and is a sheet metal surface (no serrated surface) so gasket accordingly.

Cost savings
Oh yeah, did I mention that van stone flanges are less expensive to manufacture than fixed, welded flanges? You should expect a discounted price from the cost of a traditional fixed flange expansion joint.

The van stone flange – I could’ve thought of that.


About The Author

Greg Perkins
Greg Perkins
President & General Manager

Greg Perkins has 25 years experience in the expansion joint industry. In his previous employment with Senior Flexonics Pathway, Greg Perkins held the position of CEO and General Manager for 11 years. Prior positions include project engineer, director of engineering, and business unit manager.

In addition Greg, a degreed engineer, served on both the EJMA (expansion joint manufacturers association) technical and management committee tasked with developing/updating bellows and expansion joint performance criteria. Proficient in ASME design codes. Patents include high temperature piping restraint structures for expansion joint applications.

Got questions? Need answers? Call Greg today (830) 626-7773 or send him an email [email protected]!