Single Sphere Rubber Expansion Joint
The Single Sphere Rubber Expansion Joint is a compact flanged rubber connector with one flexible sphere. It is used in municipal water supply, chemical utilities, power and metallurgy systems, HVAC circulation, pump piping, and other industrial pipeline connections.
Description
Product Overview
The Single Sphere Rubber Expansion Joint is a compact flanged rubber connector with one flexible sphere. It is used in municipal water supply, chemical utilities, power and metallurgy systems, HVAC circulation, pump piping, and other industrial pipeline connections.
Core Advantages
1. Compact reinforced single-sphere body. Multiple nylon-cord layers control deformation of the short rubber arch. Under heavy pump vibration and repeated pressure pulses, the reinforcement restrains radial expansion and distributes fatigue away from the flange neck.
2. Short face-to-face movement section. One sphere provides axial, lateral, and angular flexibility within less installed length than a double-sphere or multi-arch joint. In crowded pump rooms and equipment skids, it isolates vibration without moving adjacent valves or supports farther apart.
3. Rigid metal flange connection. Cast-steel, forged-steel, or stainless-steel flange options maintain bolt load and sealing-face alignment. Forged or stainless configurations can be selected for demanding pressure, maintenance, or external-corrosion conditions.
Key Parameters
|
Parameter |
Value |
|
Material |
EPDM / NBR High-Elasticity Rubber |
|
Reinforcement |
Multi-Layer High-Strength Nylon Cord |
|
Standards |
GB/T 26119-2010, ASME B31.3, CE, ROHS |
|
Work Temperature |
-20℃ to 120℃ |
|
Pressure Rating |
PN6 to PN16 |
|
Flange Material |
Cast / Forged / Stainless Steel |
Customization Capabilities
- Movement and service: Face-to-face length, movement rating, and vacuum construction are matched to the operating displacement.
- Rubber body: EPDM or NBR, wall thickness, reinforcement layers, and optional control rods are selected for the pressure and medium.
- Metal flange interface: Cast steel, forged steel, SS304, or SS316 can be supplied with DIN, ANSI, JIS, GB, or project drilling.
Quality Control
Rubber compound and nylon cord are verified by batch before lay-up. Cord angle and overlap are checked around the sphere and flange turn-up. Vulcanization records identify cure time, temperature, and pressure. Finished joints are measured for flange alignment, sphere concentricity, and overall length. Every unit receives a water-pressure test at 1.5 times design pressure and an air-tightness test at 1.1 times design pressure before final inspection.
FAQ
Q: What is the minimum order quantity?
A: The minimum order quantity is 10 pieces. Different sizes, flange materials, or rubber compounds can be combined after the production schedule is confirmed.
Q: How long does a custom single-sphere joint take?
A: Custom-made products normally require 40 to 50 days after the pressure, movement, flange standard, and rubber compound are approved.
Q: Can it be installed on a pump suction line?
A: Yes, only when a vacuum-rated construction is selected for the specified negative pressure. Standard pressure-only bodies should not be used without review.
Q: How should flange bolts be tightened?
A: Tighten bolts gradually in a cross pattern so the rubber bead is compressed evenly. Do not draw misaligned pipework together by over-tightening the joint.
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