Product Description
1. Product Overview
The EPDM Rubber Expansion Joint (also referred to as a Rubber Flexible Joint or Flexible Connector) is a critical component in piping systems. Its primary role is to compensate for displacement, absorb vibrations, and safeguard pipelines. Leveraging the elastic deformation of Ethylene Propylene Diene Monomer (EPDM) rubber, it mitigates axial, lateral, and angular displacements caused by thermal expansion/contraction, mechanical vibration, or foundation settlement. Additionally, it reduces vibration transmission and noise, ensuring the long-term stable operation of piping systems.
2. Core Structure & Materials
| Component |
Material & Design |
Functional Features |
| Rubber Body |
Primary material: EPDM (customizable with inner/outer composite rubbers like NBR, FPM) |
- Exceptional weather resistance (UV, ozone, aging resilience)
- Broad temperature range: -40ºC to 150ºC
- Resists mild acids, alkalis, and general corrosion |
| Reinforcement Layer |
Multi-layer high-strength cord fabric (nylon/polyester) vulcanized integrally with rubber |
Boosts pressure resistance and structural integrity; prevents excessive deformation or tearing |
| Flange Connection |
Material: Carbon Steel (WCB/A216), Stainless Steel (304/316L);
Standards: ANSI, DIN, JIS, GB, etc. |
Compatible with diverse piping systems; loose flanges accommodate installation misalignment (off-center, non-parallel scenarios) |
3. Key Technical Parameters (Typical Range; Customizable)
| Parameter |
Details |
Notes |
| Nominal Diameter (DN) |
DN32 - DN3000 (commonly DN50 - DN1200; custom sizes for reducing/expanding, double-sphere designs available) |
Matches pipeline diameter; double-sphere structures recommended for large DN (>300) |
| Pressure Rating |
PN0.6MPa - PN2.5MPa (150LB ≈1.6MPa; burst pressure can reach 4.8MPa+) |
System pressure must not exceed the rated pressure; reinforced models suit high-pressure applications |
| Operating Temperature |
-40ºC - 120ºC (special formulations extend to -40ºC - 150ºC, e.g., EPDM HT for high-temperature scenarios) |
Adjusted by rubber compound; EPDM HT ideal for elevated temperatures |
| Applicable Media |
Water, air, mild acids/alkalis, oils, seawater, hot water (clean or mildly corrosive media) |
For strong acids or organic solvents, customize with PTFE lining |
| Displacement Compensation |
Axial: ≤10-30mm (varies by DN); Lateral: ≤5-15mm; Angular: ≤3°-5° |
Absorbs multi-directional displacement to relieve pipeline stress and vibration |
4. Core Functional Advantages
-
Multi-Directional Displacement Compensation
Harnesses EPDM's elasticity to absorb axial expansion/contraction, lateral offset, and angular deflection. Adapts to thermal fluctuations, foundation settlement, and complex loads, preventing pipeline cracking.
-
Vibration & Noise Reduction
The rubber elastomer isolates mechanical vibrations from equipment (e.g., pumps, fans), cutting noise transmission (vibration damping rate >90%) and extending the lifespan of systems and equipment.
-
Weather & Corrosion Resistance
EPDM inherently resists UV, ozone, and aging (ideal for outdoor exposure). It also withstands mild acids, alkalis, and hot water, making it suitable for municipal and industrial applications (e.g., sewage, cooling water pipelines).
-
Simplified Installation
The loose flange design allows for misalignment (off-center, non-parallel), streamlining construction. Integrated rubber-flange sealing eliminates the need for gaskets, reducing installation costs.
5. Typical Application Scenarios
-
Municipal Water & Sewage Networks
Compensates for displacement in urban water supply and sewage pipelines due to temperature changes or foundation settlement, protecting pipeline joints and pumping station equipment.
-
HVAC Systems
Deployed in central air-conditioning water circuits and heating pipelines to absorb vibration, reduce noise, and enhance energy efficiency and comfort (e.g., in hotels, office buildings).
-
Industrial Piping
Suits mildly corrosive media (e.g., cooling water, dilute acids/alkalis) in chemical, power, and metallurgical industries. Compensates for displacement and mitigates vibration at equipment (pumps, compressors) connections.
-
Bridges & High-Rise Structures
Adapts to structural deformation in bridge fire protection and plumbing systems (due to loads or temperature changes), preventing pipeline rupture (e.g., sea-crossing bridges, high-rise buildings).
6. Selection & Customization Guidelines
-
Media Compatibility
- Clean water/air: Standard EPDM suffices.
- Mild acids/alkalis/high temp (≤150ºC): Opt for EPDM HT (high-temperature grade) or fluororubber (FPM) lining.
- Food/pharmaceutical sectors: Choose FDA-certified food-grade EPDM (ensures media safety for beverages, pharmaceuticals).
-
Parameter Alignment
Confirm DN, system pressure (PN), and media temperature; double-sphere structures are preferred for large DN (>300) (superior displacement compensation).
-
Flange Standards
Match flange standards (ANSI/DIN/GB, etc.) to pipeline flanges; for thin-walled pipelines, consider threaded/grooved connections.
-
Special Requirements
- Explosion/Static Resistance: Incorporate conductive rubber (for gas, oil pipelines).
- High Pressure (PN≥2.5MPa): Increase cord fabric layers or add steel-reinforced skeletons.
- Sanitary Compliance: Use food-grade rubber + stainless steel flanges (NSF, WRAS certified).
7. Standards & Certifications
- Manufacturing Standards: GB/T 12777 (China), ASME B16.41 (USA)
- Testing Standards: Leakage (GB/T 13927), Pressure Resistance (API 598)
- Common Certifications: CE, WRAS (drinking water), FDA (food-grade)
Packaging & Shipping
Company Profile
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Driven by a relentless pursuit of perfection, Tianjin Auswell Valve Co., Ltd. has significantly bolstered its management framework in recent years to meet and anticipate our clients' needs. We've proudly garnered the prestigious ISO9001 Quality Management System Certification and the esteemed British WARS Drinking Water Certification. Our product offerings, celebrated for their reliability, have made their mark across Europe, Asia, Africa, and beyond, earning widespread acclaim and trust from our clientele. Upholding our commitment to quality, we at Auswell Valve Co., Ltd. are eager to collaborate fully with peers in the valve industry. Together, we strive to elevate Chinese craftsmanship onto the global stage.
Tianjin Auswell Valve Co., Ltd. It is nestled in a storied historical town in China, a place celebrated for its rich military legacy and famed for its rice cultivation. Industrial Park, Xiaozhan Town, Jinnan District, Tianjin. Here, our company boasts comprehensive production capabilities, from innovative product design and precise mold manufacturing to advanced machining, meticulous rubber smelting, epoxy spraying, and rigorous valve assembly and testing.
With state-of-the-art processing equipment and exquisite craftsmanship, we assure that every product aligns with national or international standards, reflecting our commitment to excellence. Our dedication to superior craftsmanship ensures that we deliver only the highest quality products to our valued customers.
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Rooted in a legacy of excellence, Tianjin Auswell Valve Co., Ltd. proudly adheres to a multitude of international standards including those from China, Germany, Britain, America, Japan, and Australia. Our versatile range spans nominal diameters from DN15 to DN3000, pressure classes from 0.60 Mpa to 6.4 Mpa, and is capable of operating within temperatures from -20°C to 150°C. With a rich palette of materials like gray cast iron, ductile iron, cast steel, stainless steel, and duplex steel, our repertoire includes precision-crafted soft-sealed butterfly valves, soft-sealed gate valves, check valves, filters, ball valves, globe valves, balance valves, and diaphragm valves.
Driven by a relentless pursuit of perfection, Tianjin Auswell Valve Co., Ltd. has significantly bolstered its management framework in recent years to meet and anticipate our clients' needs. We've proudly garnered the prestigious ISO9001 Quality Management System Certification and the esteemed British WARS Drinking Water Certification. Our product offerings, celebrated for their reliability, have made their mark across Europe, Asia, Africa, and beyond, earning widespread acclaim and trust from our clientele. Upholding our commitment to quality, we at Auswell Valve Co., Ltd. are eager to collaborate fully with peers in the valve industry. Together, we strive to elevate Chinese craftsmanship onto the global stage.
After Sales Service
Our advantage :Hoswell valve company distinguishes itself with a comprehensive set of strengths. We possess in - house independent R & D capabilities, backed by state - of - the - art processing equipment. Our manufacturing processes adhere to industry - leading standards, and we operate a rigorous quality control system.
Product Quality Assurance
Quality Commitment and Inspection: Before leaving the factory, valves need to undergo strict quality inspections, such as pressure tests, sealing tests, etc. It is ensured that there are no casting defects like sand holes or air holes in the valves, and there are no bruises or scratches on the flange sealing surfaces. The markings of flow rate, direction, nominal pressure, diameter, material, etc. are clear and complete. It is promised that the valves are produced and inspected in accordance with national standards, and unqualified products will not leave the factory.
Warranty Period Service: Provide a certain period of warranty service. During the warranty period, for malfunctions caused by product quality problems, the manufacturer will repair or replace parts free of charge.
Technical Support
Pre-sales Consultation: Before customers purchase valves, provide them with professional technical consultations, including suggestions on product selection, specification parameters, material characteristics, applicable working conditions, etc., to help customers choose the most suitable valve products.
Installation Guidance: Provide installation guidance services, which can be carried out online (such as by phone, video, installation manuals, etc.) or offline (by sending technicians to the site) to ensure that the valves are installed correctly and avoid problems caused by improper installation.
Usage Training: Provide usage training for customer operators, enabling them to be familiar with the operation methods of the valves, key maintenance points, knowledge of troubleshooting common faults, etc., and improving the customers' ability to use and maintain the valves.
Supply of Maintenance Parts: Ensure the timely supply of maintenance parts. For the damage of parts outside the warranty period, provide the parts at a reasonable price (such as the cost price).
Regular Follow-up Visits: Regularly conduct follow-up visits to customers, understand the usage situation of the valves, and collect customers' feedback opinions, so as to improve the products and services.
FAQ
1) Q: Are you a manufacturer or trading company?
A: Hoswell Valve is a professional valve manufacturer with experienced R&D team.
2) Q: Do you have any agent or representative abroad?
A: Yes, we have agents in some countries, they can offer local service for you.
3) Q: What kinds of valve can you supply?
A: We can supply butterfly valve, ball valve, check valve and so on.
4) Q: Do you have any certificate for the valves?
A: Yes, we have CE, BV, ATEX, TS and so on.
5) Q: What's the delivery time?
A: If all the parts of the valve are ready in stock, the valves can be delivered within 7~10 days.
6) Q: What are the countries or regions you supply valves?
A: Hoswell valves have been supplied to USA, Europe, Australia, Singapore, South Africa and so on.
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