Rubber Expansion Joints
JGD-B Restrained Threaded Rubber Expansion Joint
The JGD-B Restrained Threaded Rubber Expansion Joint combines a threaded flexible connector with external limiting hardware for applications where joint extension must be controlled. Mingchao’s catalog covers DN15–DN80 and provides size-specific movement together with documented pressure, vacuum and elastomer temperature references.
THREADED UNION · EXTERNAL RESTRAINT · CONTROLLED EXTENSION
- Model
- JGD-B
- Catalog Range
- DN15–DN80
- Selection
- Pressure · Temperature · Medium · Movement
- Customization
- Drawing-Based
Project Configuration
Mingchao can customize the product configuration based on the technical information, operating conditions and dimensional data you provide. Final configuration can be reviewed and manufactured to the approved project drawing.
JGD-B Restrained Threaded Rubber Expansion Joint — Overview
The JGD-B Restrained Threaded Rubber Expansion Joint combines a threaded flexible connector with external limiting hardware for applications where joint extension must be controlled. Mingchao’s catalog covers DN15–DN80 and provides size-specific movement together with documented pressure, vacuum and elastomer temperature references.
The catalog values are source references. Final suitability and operating limits require the selected material, dimensions, connection and project conditions to be confirmed.
Why Add External Restraint to a Threaded Rubber Joint?
This connection geometry combines flexible isolation with the product-specific interface shown in the catalog. Selection must consider the complete piping arrangement and approved drawing.
R12 Restrained vs. R11 Standard Threaded Union
Catalog references: working pressure 232 psi / 16 bar, burst pressure 696 psi / 48 bar, vacuum 400 mmHg; EPDM -10°C to 90°C, NBR -10°C to 80°C, Neoprene -10°C to 90°C. Listed media include air, water, oil, acid, alkali and seawater; compatibility must be confirmed against concentration, temperature and pressure. Materials include Malleable Iron, Nylon Cord Fabric, Neoprene / NBR / EPDM, Low Carbon Steel bolts/nuts and Steel Wire ring.
Unified DN15–DN80 Engineering Specifications
Unified engineering fields: DN; NPS; FTF; Movement; Thread Standard; Union Type; Pressure; Burst; Vacuum; Elastomer Temperature; Medium; Rubber; Reinforcement; External Restraint; Limit Requirement; Bolt/Nut Material; Anchor/Support; Custom Thread; Custom Length; Drawing. Catalog numeric fields are exact; other requirements are project-specific or factory-confirmation fields.
| DN | NPS | Face-to-Face L (mm) | Extension (mm) | Compression (mm) | Lateral (mm) | Angular (deg) |
|---|---|---|---|---|---|---|
| 15 | 0.5 | 203 | 5–6 | 22 | 22 | 45 |
| 20 | 0.75 | 203 | 5–6 | 22 | 22 | 45 |
| 25 | 1 | 203 | 5–6 | 22 | 22 | 45 |
| 32 | 1.25 | 203 | 5–6 | 22 | 22 | 45 |
| 40 | 1.5 | 203 | 5–6 | 22 | 22 | 45 |
| 50 | 2 | 203 | 5–6 | 22 | 22 | 45 |
| 65 | 2.5 | 265 | 8–10 | 24 | 24 | 45 |
| 80 | 3 | 285 | 8–10 | 24 | 24 | 45 |
Catalog movement values are individual references; combined movement requires engineering confirmation.
Thread Standard & Connection Requirements
Connection geometry and interface requirements must be stated on the customer or project drawing. Do not assume an unspecified thread, flange or angle.
External Limiting Hardware & Movement Control
Catalog movement values are individual references and must not be combined simultaneously without engineering confirmation.
Pressure, Burst, Vacuum & Elastomer Temperature
Catalog references: working pressure 232 psi / 16 bar, burst pressure 696 psi / 48 bar, vacuum 400 mmHg; EPDM -10°C to 90°C, NBR -10°C to 80°C, Neoprene -10°C to 90°C. Listed media include air, water, oil, acid, alkali and seawater; compatibility must be confirmed against concentration, temperature and pressure. Materials include Malleable Iron, Nylon Cord Fabric, Neoprene / NBR / EPDM, Low Carbon Steel bolts/nuts and Steel Wire ring.
Material & Medium Selection
Material selection depends on medium, concentration, temperature, pressure and environment. Catalog materials are references, not universal compatibility guarantees.
Anchors, Supports & Pressure Thrust
Drawing-based custom geometry is available subject to engineering and manufacturability review. Custom geometry does not imply unlimited pressure, temperature or movement.
Custom Thread, Length & Restraint Geometry
Typical applications require confirmation of pressure, temperature, medium, movement, supports and connection details.
Applications
Internal pressure creates thrust. Rubber joints do not replace anchors, guides or independent pipe/equipment supports. Installation must avoid forced alignment and torsional preload.
Project RFQ
Send DN/NPS, connection standard, pressure, temperature, medium, movement, dimensions, quantity and approved drawing for project-specific quotation.
