China High Pressure Rubber Hose Supplier

Core Construction

• Inner tube: Formulated from synthetic rubber compounds such as NBR (nitrile), EPDM, SBR, or neoprene. The choice depends on the fluid being conveyed. NBR excels in oil and fuel resistance, while EPDM handles high-temperature water and steam. JIDONGDA uses custom blended compounds to achieve optimal compatibility with hydraulic oils, water-based fluids, and aggressive chemicals.
• Reinforcement layer: This is the heart of the pressure-bearing capability. Multiple layers of high-tensile steel wire braid or spiral-wound steel wire are embedded in the rubber. Some designs use textile braiding for moderate pressure. For extreme high pressure requirements, four or six layers of spiral wire reinforcement are common. JIDONGDA hoses feature tightly controlled braiding angles and wire tensions to maximize burst strength while preserving flexibility.
• Outer cover: Provides abrasion, ozone, weather, and oil resistance. Typically made from neoprene or synthetic rubber with additional surface treatments. JIDONGDA’s covers are designed with a smooth or wrapped finish, and special MSHA-approved covers are available for mining applications.

Frequently Asked Questions

What safety factors should I apply when choosing a high pressure rubber hose?

Industry standard is a 4:1 safety factor between burst pressure and maximum working pressure. However, dynamic applications with pressure spikes or impulse cycles often require a higher factor, such as 5:1 or 6:1. JIDONGDA engineering team can help calculate the right safety margin based on pump ripple, acceleration, and the system’s pressure profile. Never exceed the manufacturer’s published working pressure, and always consider temperature derating.

How does temperature affect a rubber hose’s performance?

As temperature rises, the rubber compounds soften and the reinforcement’s strength can diminish. For example, an NBR hose rated 4,000 psi at 100°C might only sustain 3,200 psi at 120°C. JIDONGDA provides derating curves in their technical catalogs. For continuous high-temperature use above 120°C, consider hoses with HNBR or EPDM inner tubes and proper insulation. Low temperatures can make rubber brittle; a rated -40°F hose must still be handled carefully near that limit.

What standards do JIDONGDA rubber hoses comply with?

JIDONGDA hoses are manufactured to meet or exceed SAE 100R series, EN 853, EN 856, ISO 1436, ISO 3862, and DIN 20022/20023. Many hoses also carry MSHA approvals for mining. Full certifications and batch test reports are provided upon request.

How do I correctly measure the length of a high pressure rubber hose assembly?

Measure from sealing face to sealing face along the centerline of the hose, including fitting ends. Allow for routing bends and thermal expansion. JIDONGDA offers a measurement guide and can fabricate custom assemblies on-site. Using the correct length prevents undue stress on fittings and extends service life.

What causes rubber hose failure and how can I prevent it?

Common failure modes include: internal tube erosion from high fluid velocity (exceeding recommended flow), reinforcement fatigue from excessive pressure surges, external abrasion from rubbing against other hoses or machine parts, and chemical incompatibility causing swelling or hardening. Prevent failures by using JIDONGDA’s application worksheet to match hose to fluid and pressure, installing protective sleeves or hose guards in harsh areas, and implementing a regular inspection regimen.