Coliter ® Rubber Shock Absorber (Rubber Joint) – DN32–DN2400, 15° Max Deflection, for Vibration & Noise Control in Piping Systems
KXT Rubber Shock Absorber (Rubber Joint) – Flexible Single-Sphere Rubber Expansion Joint for Pump Connections, Thermal Movement & Seismic Protection
The Coliter® KXT Rubber Shock Absorber (also known as a rubber expansion joint or flexible rubber coupling) is a high-performance vibration-isolating component designed to absorb mechanical shock, compensate for misalignment, and accommodate thermal expansion/contraction in fluid piping systems. Widely installed at the inlet and outlet of pumps, chillers, cooling towers, and HVAC equipment, it effectively reduces noise transmission, prevents pipeline stress damage, and protects connected machinery from foundation settlement or seismic movement. The KXT features a single-sphere elastomeric body reinforced with multiple layers of fabric and embedded steel wire rings for pressure resistance, combined with carbon steel or stainless steel flanges compliant with GB/T 17241.6-1998. It supports axial extension/compression, lateral displacement, and angular deflection up to 15° (depending on size), with operating temperatures suitable for standard water, air, and mild chemical media. Available in sizes from DN32 to DN2400, the joint can be customized with inner/outer rubber liners made of Natural Rubber (NR), Nitrile (NBR), EPDM, or other compounds based on media compatibility. Key benefits include high pressure resistance, corrosion resistance, aging resistance, excellent flexibility, and long service life. Ideal for use in municipal water supply, power plants, petrochemical facilities, shipbuilding, and industrial process lines, the KXT rubber joint ensures system integrity, operational quietness, and extended equipment lifespan.
Installation diagram
Product Description
| DN | NPS(in) | length L | Flange thickness B | Diameter of bolt hole center circle Φ | Bolt hole diameter | Number of bolts h | Lateral displacement | Lateral displacement | Deflection angle α₁+α₂ | |
| elongation | compress | |||||||||
| 32 | - | 85 | 18 | 100 | 18 | 4 | 8 | 10 | 10 | 15° |
| 40 | - | 95 | 18 | 110 | 18 | 4 | 8 | 10 | 10 | 15° |
| 50 | - | 105 | 18 | 125 | 18 | 4 | 8 | 10 | 10 | 15° |
| 65 | - | 115 | 20 | 145 | 18 | 4 | 8 | 10 | 10 | 15° |
| 80 | 3 | 135 | 20 | 160 | 18 | 8 | 10 | 12 | 12 | 15° |
| 100 | 4 | 150 | 22 | 180 | 18 | 8 | 10 | 12 | 12 | 15° |
| 125 | 5 | 165 | 24 | 210 | 18 | 8 | 12 | 12 | 12 | 15° |
| 150 | 6 | 180 | 24 | 240 | 22 | 8 | 14 | 12 | 12 | 15° |
| 200 | 8 | 190 | 24 | 295 | 22 | 8 | 14 | 16 | 12 | 14° |
| 250 | 10 | 230 | 28 | 350 | 22 | 12 | 14 | 16 | 16 | 12° |
| 300 | 12 | 245 | 28 | 400 | 22 | 12 | 14 | 18 | 16 | 10° |
| 350 | 14 | 255 | 28 | 460 | 22 | 16 | 14 | 18 | 18 | 8° |
| 400 | 16 | 255 | 30 | 515 | 26 | 16 | 14 | 20 | 18 | 8° |
| 450 | 18 | 255 | 30 | 565 | 26 | 20 | 14 | 20 | 20 | 6° |
| 500 | 20 | 255 | 32 | 620 | 26 | 20 | 14 | 22 | 20 | 6° |
| 600 | 24 | 260 | 36 | 725 | 30 | 20 | 14 | 22 | 22 | 5° |
| 700 | 28 | 260 | 36 | 840 | 30 | 24 | 14 | 22 | 22 | 4° |
| 800 | 32 | 260 | 36 | 950 | 33 | 24 | 15 | 22 | 22 | 4° |
| 900 | 36 | 260 | 36 | 1050 | 33 | 24 | 15 | 22 | 22 | 3° |
| 1000 | 40 | 260 | 36 | 1120 | 30 | 28 | 15 | 22 | 22 | 3° |
| 1200 | 48 | 300 | 36 | 1340 | 33 | 32 | 15 | 22 | 22 | 3° |
| 1400 | 56 | 320 | 40 | 1560 | 36 | 36 | 15 | 22 | 22 | 3° |
| 1600 | 64 | 350 | 42 | 1760 | 36 | 40 | 15 | 22 | 22 | 3° |
| 1800 | 72 | 400 | 44 | 1970 | 39 | 44 | 18 | 24 | 24 | 2° |
| 2000 | 80 | 450 | 48 | 2180 | 42 | 48 | 18 | 24 | 24 | 2° |
| 2200 | 88 | 500 | 52 | 2390 | 42 | 52 | 20 | 24 | 25 | 1.5° |
| 2400 | 96 | 550 | 56 | 2600 | 42 | 56 | 20 | 24 | 25 | 1.5° |
Note: 1. Flange connection data shall comply with gb/t17241.6-1998.
This product is widely used in the connection between pump body and pipeline of pump station, pump house, heating, air conditioning, ventilation and other pumps conveying various fluid media. It can extend, compress, deflect and displace, and effectively prevent pipeline damage caused by foundation settlement and pipeline fracture caused by thermal expansion and cold contraction. Moreover, it has obvious effects of high pressure resistance, corrosion resistance, aging resistance, vibration absorption and noise reduction, which will play an important role in protecting the equipment and prolonging the service life of the equipment.
Materials of main parts
| flange | High quality carbon structural steel, stainless steel |
| Inner and outer adhesive layers | Natural rubber, nitrile rubber, EPDM, etc |
| Middle adhesive layer | Natural rubber, nitrile rubber, EPDM, etc |
| Enhancement layer | Natural rubber, nitrile rubber, EPDM, etc |
| Wire rope loop | steel wire |
Product Inquiry
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Faq - Frequent questions
Introduction to Joint
Coliter®’s expansion joints absorb thermal expansion, vibration, and misalignment in water, HVAC, fire protection, and industrial piping systems. The series includes the KXT rubber flexible joint (single/double sphere) with EPDM/NBR inner liners for noise and shock reduction, the B2F double flange limit expansion joint that restricts axial movement while allowing angular deflection, and the SS metal bellows expansion joint for high-temperature steam or corrosive media. Available in flanged or threaded connections (DN25–DN3000), rated at PN6–PN25, and compliant with GB/T 12465 and ISO standards, these joints protect pumps, valves, and supports from stress damage—ensuring system integrity, leak-free operation, and extended service life.
