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Hachiken JJ Bellows

Made in Japan
Manufacturer : Hachiken
Model : JJ

A bellows-type rubber joint used where large expansion and contraction is required at low pressure. This product has the least axial reaction force among various rubber joints.

Feature

  • Due to the bellows structure, the compressive reaction force in the axial direction is extremely small.
  • Unlike general bellows, it is not sewn at all, so it is highly airtight.

The purpose

  • Connection of piping with low pressure and large displacement.
  • Connection of piping that requires low reaction force such as scales.

Usage

  • Connection of vibrating feeders and automatic weighers in powder piping systems
  • Blower anti-vibration/sound insulation
  • Connection of places that are frequently removed, such as moving hoppers
  • Absorption of expansion and contraction caused by the temperature of PVC piping
  • Dust cover for cylinder rod

Standard specifications

  • Maximum operating temperature : -10 to 60°C
  • Maximum working pressure : -20kPa to 0.01MPa
  • Flange standard : JIS 5K
  • Rubber material : CR

Structure and material

Bellows structure diagram
Part number Name Material
1 Body CR with Nylon
2 Reinforcement ring SUS304
3 Reinforcement ring SUS304
4 Flange SS※
5 Rubber seal CR

*The standard flange is electrogalvanized.

Dimensions and performance table

* Please contact us separately for sizes from 350A to 1000A.

Nominal diameter A. L. W. S. Mass kg
80A 89 140 200 75 4.1
100A 114 155 220 75 4.9
125A 140 180 230 75 6.7
150A 165 200 290 100 9.2
200A 216 230 320 100 14
250A 267 270 400 120 20
300A 319 300 420 120 22

※1. Mass is for JIS 5K flange.

※2. Please contact us for special lengths.

※3. Weight is a guideline.

Option

Standard option
Flange Yes None
Flange structure Fixed Loose
Flange standard JIS 10K Tap water F12, JIS 5K, JPI class 150, etc.
Flange material SS plating SUS304, SUS316, etc.

*Please contact us if the rubber material is other than CR.

<Remarks/Precautions>

  • If the fluid is liquid and the joint is used in an overhead pipe, the weight of the internal fluid may cause the joint to sag.
  • If the product is long, it may protrude sideways when pressurized.
  • It is not suitable for slurry-like fluids because the inner surface is also uneven and solids may accumulate.
  • Use an inner cylinder (sold separately) as necessary when abrasive fluids pass through.
  • Please contact us for non-standard specifications (diameter, length, etc.).

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