Stainless Steel Wire/Polyester Fabric Reinforcement Layer, Rubber Sphere Joint

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW
• Type: Welding Flange
• Model NO.: DN25-DN3200
• Material: Stainless Steel
• Structure: Round
• Connection: Welding
• Sealing Surface: RF
• Manufacturing Way: Forging
• Channel of Product: Factory Direct Sales
• Test Item 1: Hydrostatic Testing
• Test Item 2: Pressure
• Test Item 3: Movement Distance
• Transport Package: Standard Export Plywood Case
• Specification: 1/2" to 24"
• Trademark: XINQI
• Origin: China
• HS Code: 7307210000
• Production Capacity: 300 Pieces/Day
• Package Size: 100.00cm * 100.00cm * 110.00cm
• Package Gross Weight: 1800.000kg

Product Description

Single Sphere Rubber Flexible Joints

Rubber expansion joints consist of inner and outer rubber, nylon cord fabric which are vulcanized and then combined with metal flanges or loose sleeves of parallel joints. This product can reduce vibration and noise, and compensate thermal expansion and contraction caused by temperature change. It is widely used in various pipeline systems.

Key Functions & Performance Advantages

1.Movement Absorption: Accommodates axial (compression/extension), lateral (side - to - side), angular (deflection), and limited torsional movement to compensate for thermal shifts, equipment misalignment, or foundation settlement.
2.Vibration & Noise Isolation: Dampens mechanical vibration from pumps, compressors, and fans; reduces noise transmission between piping and structures.
3.Stress Mitigation: Protects pipes, valves, and equipment from fatigue failure caused by thermal expansion, hydraulic surges, or seismic activity.
4.Corrosion & Abrasion Resistance: Elastomer liners resist chemicals, saltwater, and particulate wear better than rigid metal alternatives in many applications.
5.Ease of Installation: Lightweight, flexible design simplifies alignment and reduces installation time; no special tools required for most types.

Specification

Component	Function	Common Materials
Inner Elastomer Liner	Media contact, corrosion/abrasion resistance	EPDM (water/steam), Nitrile (NBR, oil/fuel), Neoprene (CR, chemicals), Viton (FKM, high temp/aggressive media), Natural Rubber (general purpose)
Reinforcement Carcass	Pressure resistance, structural strength	Fabric plies (Nylon, Polyester, Aramid), metal rings/wire (for high pressure/vacuum)
Outer Cover	Environmental protection (ozone, UV, weathering)	EPDM, Chloroprene, or coated fabric
End Connections	Pipe interface	Flanged (steel/integral rubber), clamped, threaded, or socket-welded

Company Profile

Hebei Xinqi Pipeline Equipment Co., Ltd

Since: 2017
Specialty: high quality steel flanges  in pipeline connextion solutions
Capacity:   5 tons/week
Advanced Features:

High-Temperature & Mechanical Performance
Excellent Weldability by all standard methods
Good machinability and formability for producing various flange types and sealing faces.

Main Types

Typical Applications

Single - Sphere: Standard for general - purpose movement absorption (most widely used).
Double - Sphere: Higher lateral/axial movement capacity for demanding systems.
Arch - Type: Thick elastomer body with metal reinforcement for large thermal expansion/contraction.
PTFE - Lined: For aggressive chemicals or high - purity media.
Clamp - On: Quick - connect design for low - to - medium pressure, easy maintenance.

Water/wastewater treatment, desalination, and municipal piping.
HVAC, heating/cooling systems, and power plants (steam/water lines).
Chemical processing, oil/gas, and refineries (corrosive media handling).
Pulp/paper, cement, and mining (abrasive slurry transport).
Marine, offshore, and seismic - prone areas (foundation movement compensation).

Performance Parameters & Standards

Installation & Maintenance Tips

Pressure Ratings: Typically 150 psi (10 bar) standard, up to 300 psi (20 bar) for heavy - duty designs; vacuum service available with metal reinforcement.
Temperature Range: -40°F to 300°F (-40°C to 150°C) for EPDM/NBR; up to 400°F (204°C) for Viton/FKM.
Movement Capacities: Axial ±10–50 mm, lateral ±5–25 mm, angular ±3°–15° (varies by size/design).
Standards: ASTM F1123, EN 13157, HG/T 2289 (China) for material and performance compliance.

1.Avoid over - tightening flanges to prevent damage to the elastomer body.
2.Protect from sharp metal edges, ozone - rich environments, or incompatible chemicals.
3.Use alignment guides to prevent excessive movement beyond rated limits.
4.Inspect regularly for cracks, bulges, or leaks; replace if elastomer shows signs of aging.

Certifications

ISO 9001

SGS verify

Export Certificate

2015 Certified Production

SGS Certified

FAQ

Primary Application Areas:

a) How can I get more details about your products?
You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 
b) How can I get some samples?   
If you need, we will offer you samples for free, but new customers are expected to pay express charge. 
c) Do you provide customized parts? 
Yes, you can give us drawings and we will manufacture accordingly. 
d) To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 
e) I can't see the goods or touch the goods, how can I deal with the risk involved?  
Our quality management system conforms to the requirement of ISO 9001:2015 verified by BV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.