Versatile Flange Type Rubber Expansion Joint for Fluid Transfer

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW
• Type: Welding Flange
• Model NO.: GC-HK877
• Material: Stainless Steel
• Structure: Flanges
• Connection: Flanged
• Sealing Surface: TG
• Manufacturing Way: Forging
• Applicable Media: Water, Steam, Air, Weak Acid/Alkaline Solution, Oi
• Flange Sealing Surface Form: Flat Surface (FF), Convex Surface (RF), Ring Joint
• Anti-Pull-off Design: Limiting Rod (Adjustable/Fixed), Anti-Pull-off Fla
• Lining: Smooth Surface (Anti-Scaling), Guide Tube (Anti-Sc
• Structure Type: Single Sphere, Double Sphere, Triple Sphere, Reduc
• Flange Material: Carbon Steel Q235B, Stainless Steel 304/316L, Forg
• Connection Type: Single Flange (Flange on One End + Welding on One
• Transport Package: Standard Export Packaging
• Specification: Can be customized
• Trademark: GOCHAIN
• Origin: China
• HS Code: 4016991000
• Production Capacity: 5000000
• Package Size: 210.00cm * 180.00cm * 180.00cm
• Package Gross Weight: 598.000kg

Product Description

Product Description

Flange type rubber expansion joint is a kind of rubber flexible pipe joint with flange, which can compensate the pipe displacement, reduce vibration and noise through elastic deformation, and protect the safe operation of the system.

 

Detailed Photos

Anti-pull-off safety design

Patented wire ring locking: 2 embedded 304 wire rings, pull-off resistance ≥ 1.5 times the working pressure (DN400 measured tensile strength > 50 tons)

Adjustable limit pull rod (optional): mechanical hard limit to prevent over-compensation displacement from causing pipe burst (especially suitable for pipelines with settlement risk)

1. Zero leakage seal Rubber-flange high temperature molded integrated vulcanization (peel strength ≥ 8kN/m) + adaptive convex seal (RF) design
2. Vibration attenuation ≥ 90% Multi-layer rubber-cord composite structure absorbs high-frequency impact (10~200Hz) and reduces the vibration energy transmitted by the pump/compressor
3. Multi-directional displacement compensation Axial ±150mm + lateral ±50mm + angular ±15° (DN1000 level) to eliminate thermal stress

Safety : EU Pressure Equipment Directive PED 2014/68/EU (. IV), ISO 9001 quality system

Performance 

Fatigue life: Passed ISO 7326 standard test (>5 million displacement cycles)

Burst pressure: ≥3 times design pressure (PN16 product measured >6.0MPa)

Environmental : RoHS 2.0 (heavy metal limit), REACH (no PAHs precipitation)

Adaptation to working conditions
High-pressure scenario: increase the number of fabric layers (≥4 layers) + steel wire ring reinforcement;

High-vibration scenario: select double-sphere structure (vibration absorption rate increased by 40%);

Pipeline with sedimentation risk: anti-pull-off limit rod must be installed;

Seawater environment: flange material must be 316L stainless steel (pitting corrosion resistant).

Key sealing technology
Flange sealing surface: convex surface (RF) accounts for 90% of the market, and is matched with non-metallic gaskets (rubber/graphite) to achieve zero leakage;

Ball-flange bonding: high-temperature compression molding and vulcanization, peel strength ≥8kN/m (ISO 813 standard).

 

Product Parameters

Flange-Type Rubber Expansion Joint Core Parameters

Parameter Category	Parameter Item	Typical Value/Range	Unit	Remarks
Basic	Nominal Diameter (DN)	DN50 ~ DN3000	mm	or NPS 2" ~ 120" (inch system)
	Nominal Pressure (PN)	PN6 ~ PN25	Bar	US Std: Class 150 ~ 300
	Flange Connection Std	GB/T 9119 (CN) ANSI B16.5 (US) EN 1092-1 (EU) JIS B2220 (JP)	-	Sealing face: RF (Raised Face), FF (Flat Face), etc.
Displacement Capacity	Axial Compression	+6 ~ +45	mm	Increases with diameter (e.g., +14mm for DN100)
	Axial Extension	-10 ~ -25	mm	e.g., -28mm for DN100
	Lateral Displacement	±5 ~ ±35	mm	Multi-convolution design for large displacement
	Angular Deflection	≤15°	°	Per convolution
Material Configuration	Main Rubber Material	NR / CR / NBR / EPDM / FKM	-	By media: NR: air/water; NBR: oils; EPDM: hot water/steam; FKM: corrosive media
	Reinforcement Layer	Multi-ply polyester cord/steel wire	-	Critical pressure-bearing structure
	Flange Material	Q235 carbon steel / SS304 / SS316L	-	Selected by corrosion resistance
Performance Parameters	Operating Temp. Range	-30ºC ~ +180ºC	ºC	Depends on rubber: EPDM: -30~120ºC; FKM: -20~180ºC
	Compatible Media	Water/air/oils/weak acids & alkalis	-	PTFE lining required for strong acids/alkalis
	Burst Pressure	≥4 × working pressure	MPa	Safety redundancy design
	Vacuum Resistance	-0.08 ~ -0.1	MPa	Requires anti-collapse rings
Structural Parameters	Number of Convolutions	Single / Double / Triple	-	Multi-convolution enhances displacement capacity
	Flange Bolt Holes	4 (DN50) ~ 48 (DN3000)	pcs	Complies with relevant flange standards

Certifications

 

Packaging & Shipping

Use standard international export standard transport packaging
 

 

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