Chesterton offers the proven, nesting ripple bellows design. In the nesting ripple design, all bellows plates are identical and contoured to permit nesting when compressed. Nesting distributes pressure uniformly accross the span of the bellows. The end result is less stress at the bellows welds.

While the industry standard is nine convolutions bellows spring, Chesterton uses a twelve convolution bellows core.The twelve convolutions achieves maximum bellows plate thickness while it does not compromise the bellows spring rate. The design offers lower heat generation and greater seal reliability.

Chesterton’s superior bellows technology comes packaged in an array of seal configurations.

186HT standard ANSI/ISO pump design.
186HTX thin cross-section for small pump frames.
186HTA designed for API pumps.
186HT/OS designed for oversized stuffing boxes
886HT replaces OEM seals.

• Universal, advanced seal materials for use in a broad range of high temperature sealing applications.
• Proven performance in high temperature services.
• Versatile slotted gland design.
• Cartridge seal designed to fit standard pump bores.
• Available for ANSI/ISO and API pump models.
• Easily replaces OEM component seals.

Chesterton’s 186 HT Bellows Seal

• High temperature grafoil secondary seals. 
• Advanced bellows design for maximum cycle life.
• Heat-treated AM350 bellows core.
• Rotating bellows eliminates clogging.
• Low expansion alloy.
• Blister-resistant carbon.
• Anti-coke throttle bushing.
• Full featured gland with flush, quench/vent and drain.
• Higher pressure capability.
• Maximum axial motion.
• Compact bellows design.
• Low stresses at the ID weld joints.

• Blister-resistant antimony carbon.
• High heat transfer, chemically resistant silicon carbide.
• Heat-treated AM350 bellows core.
• Low expansion alloy face retainer.
• Optional heat treated Inconel 718 bellows for corrosive services.
• High temperature grafoil secondary seals.