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KST-F-Double sphere limit rubber joint

KST-F-Double sphere limit rubber joint

KST-F double sphere limit rubber joint
The multi-wave design of the KST-F double-ball joint increases the length of the rubber joint and increases the amount of compensation. Special cold water, hot water, compressed air, natural gas, etc. It solves the pipe bursting and damage pipeline connection equipment caused by thermal expansion and contraction with unique design, novel structure and good sealing performance, effectively improving the pipeline life cycle. And protection of the device. The double sphere has a greater amount of compensation than a single sphere.
[product alias]: flexible double ball rubber joint, double sphere rubber soft connection
[product pressure]: 1.0MPa-2.5MPa
[product specifications]: [DN40mm-DN600mm]
[Product Certification]: ISO9001-2008
[Scope of application]: [acid, alkali, corrosion, oil, hot water, cold water, compressed air, compressed natural gas, etc.]
[Working temperature]: -40 degrees to 80 degrees (can also process high temperature rubber joints)
The double-ball rubber joint reduces vibration, reduces noise, has good flexibility, and is easy to use.
1. Small size, light weight, good elasticity, convenient installation and maintenance.
2. Horizontal, axial and angular displacement can be generated during installation. It is not restricted by the pipe and the flange is not parallel.
3. It can reduce the structure transmission noise and strong vibration absorption capacity during work.
Due to its good comprehensive performance, the double-sphere rubber joint is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power and other basic projects, especially suitable for large vibration and cold. Pipes with frequent heat changes.
The double-ball rubber joint is a pipe joint with high elasticity, high air tightness, medium resistance and weather resistance. The internal density is high, it can withstand high pressure, and the elastic deformation effect is good. The double sphere has a greater amount of compensation than a single sphere. This product is made by the company using air blow mold new technology, which is composed of inner rubber layer, reinforcement layer, middle rubber layer and outer rubber layer composite ball and loose sleeve forged low carbon steel flange. It has high pressure resistance and elasticity. Good, large displacement, good vibration and noise reduction, easy installation and so on. It can be widely used in water supply and drainage, HVAC, fire protection, compressors, paper, pharmaceutical, ship, water pump, fan and other pipeline systems.
The rubber joint is composed of a reinforced rubber piece and a loose metal flange for the joint of the tower to reduce noise and compensate displacement. Strictly in accordance with international standards and raw material quality requirements, to prevent the phenomenon of cutting corners, the environmental protection standards, that is, the raw materials of the products not only need new materials, but also need environmentally-friendly new materials.
Technical Parameters
 No. Part  Material
1  Body (NR)、(CR)、(IIR)、(NBR)、(FKM)、(EPDM)
2  Inner & Outer Rubber (NR) (CR)丁(IIR) (NBR)(FKM)(EPDM)(PTFE)
3  Body Carcass Nylon cord fabric
4  Reinforcing Ring  Multi-strand coppering steel wire
5 Flange Cast and forged carbon steel(Q235)、 Stainless steel(201、304、316、321)、 Plastic(CPVC、PVDF、PPH、UPVC、RPP)
Item |Medol KST-F-1 KST-F-2 KST-F-3
A. If media is oil, acid or alkali. 
B. If special requirements for working temperature 
C. If OEM orders with drawings or samples 
D. Please Inform us about above when ordering
MpaWoring pressure 1.0(10) 1.6(16) 2.5(25)
Mpa Burst Pressure 2.0(20) 3.0(30) 4.5(45)
Kpa Vacuum 53.3(400) 86.7(650) 100(750)
℃Applicable Temperature -20℃~+115℃(-30℃~+250℃ under special conditions)
Applicable Medium Air, compressed air, water, sea water, oil, acid, alkali, etc.
Note: the materials of main parts are the same with those of KXT type
Nominal Diameter


Axial displacement mm

Haorizontal isplacement mm

Angular deflection(a1+a2)°


Extension Compression
40 1.5 165 10 20 20 30
50 2 165 10 20 20 30
65 2.5 175 10 20 20 30
80 3 175 10 20 20 30
100 4 225 15 30 25 30
125 5 225 15 30 25 30
150 6 225 15 30 25 30
200 8 325 20 40 30 30
250 10 325 20 40 30 30
300 12 325 20 40 30 30
350 14 325 20 40 30 30
400 16 340-400 20 40 30 30
450 18 340-400 25 45 30 30
500 20 340-400 25 45 30 30
600 24 340-400 25 45 30 30

Notes: 1. For OEM orders with special requirement, rubber joints can be made according to customers' drawings. Generally, flange standard is GB/T9115.1-2000, other GB, JB, HG, CB, ANSI, DIN, BSEN, NF, EN, JIS, ISO flanges are also available upon request. Material of rubber body can be NR natural rubber, EPDM, Neoprene, IIR butyl rubber, NBR Buna-N, FKM, etc. 
2.When rubber joints size above DN200 are used for overhead water supply system, the pipes must be equipped with fixed supports or fixed brackets, otherwise control units shall be installed on rubber joints. 
3.Matching flanges of rubber joints shall be valve flanges or GB/T9115.1-2000 flanges.