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Double Sphere Flange Type Rubber Joint vs Union Type: Materials and Connection Fit

Hebei honest industrial group Co.,Ltd.JOURNAL / SIDE BY SIDE

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Double Sphere Flange Type Rubber Joint vs Union Type: Materials and Connection Fit

A comparison of Double Sphere Flange Type Rubber Joint and Double Sphere Union Type Rubber Joint. It covers body and reinforcement materials, size and length ranges, displacement data, and connection details.

AI-generated illustration; not a real product photograph, specification, operating permission or test certificate.

Double Sphere Flange Type Rubber Joint

Double Sphere Union Type Rubber Joint

Scope of this comparison

This comparison addresses the double sphere flange type rubber joint and the Double Sphere Union Type Rubber Joint listed in the confirmed product records for Hebei honest industrial group Co.,Ltd. It uses the same decision criteria for both products: materials, connection and dimensional information, documented movement values, and selection fit based on the available size and connection data.

At-a-glance comparison

Criterion	Double Sphere Flange Type Rubber Joint	Double Sphere Union Type Rubber Joint
Main body	Polarized rubber	Polarized rubber
Lining	Nylon cord fabric	Nylon cord fabric
Reinforcement or frame	Hard steel wire	Not specified in the confirmed record
End connection material	Forged steel flange	Malleable iron or steel union
Connection type	Flanged end	Union type
Documented size range	DN32–DN600 (1 1/4–24 in)	DN15–DN80 (1/2–3 in)
Listed length range	175–400 mm, depending on size	200–245 mm, depending on size
Pressure information	PN10 and PN16 dimensions are listed	Not specified in the confirmed record
Movement data	Axial stretch 25–35 mm; compression 45–60 mm; lateral displacement 38–50 mm; deflection angle 20–35°, depending on size	Axial displacement 5–6 mm; stretch 22 mm; compression 22 mm; lateral displacement 22 mm

Materials and construction

Both records identify a polarized rubber main body and a nylon cord fabric lining. The flange-type record additionally identifies a hard steel wire frame and a forged steel flange. The union-type record identifies the connection component as malleable iron or steel, but does not identify a separate frame material or a pressure class.

For procurement, this means the material check is not identical for the two configurations.

Connection dimensions and size coverage

The flange-type product lists sizes from DN32 to DN600, or 1 1/4 to 24 inches. PN10 and PN16 flange dimensions include flange diameters and bolt-hole information by size. For example, at DN32, the length is 175 mm and the flange diameter is 100 mm for both PN10 and PN16, with 4-18 bolt-hole notation. At DN200, the length is 325 mm; the PN10 flange diameter is 295 mm with 8-23 notation, while the PN16 flange diameter is 295 mm with 12-23 notation.

The union-type product covers DN15 to DN80, or 1/2 to 3 inches. Its lengths are 200 mm for DN15–DN50 and 245 mm for DN65–DN80.

For connection planning, the flange type contains flange interface data across a wider size range, while the union type covers smaller nominal sizes.

Documented movement values

The flange-type record lists axial stretch of 35 mm for all shown sizes. Compression is 50 mm for DN32–DN150 and 60 mm for DN200–DN300; it is 45 mm for DN350–DN600. Lateral displacement is listed from 38 to 50 mm, and the deflection angle is 35° for DN32–DN250 and 20° for DN300–DN600.

The union-type product has axial displacement of 5–6 mm, stretch of 22 mm, compression of 22 mm, and lateral displacement of 22 mm for sizes DN15–DN80.

Which connection fits the requirement?

Choose the flange-type candidate when the piping design calls for a flanged interface and the required nominal size falls within DN32–DN600, subject to confirming the applicable PN10 or PN16 dimensions and project conditions. Its record provides flange diameters, bolt-hole notation, length, and movement values by size.

Consider the union-type candidate when the design calls for a union connection and the required size is within the DN15–DN80 range.

For the confirmed flange-type product page, see Double Sphere Flange Type Rubber Joint. The page link is provided for product review; project approval should still use the applicable technical documentation.

Buyer checklist

Before issuing a purchase order, confirm:

Nominal size and face-to-face length.
Required connection type: flange or union.
For the flange type, the applicable PN10 or PN16 drilling and diameter dimensions.
Body compound, reinforcement, and end-component materials.
Required axial, lateral, compression, and angular movement under the project’s operating conditions.

Bottom line

The distinction is primarily the connection arrangement and the scope of the dimensional data. The flange-type product covers DN32–DN600 and supplies PN10/PN16 flange information; the union-type product covers DN15–DN80 and supplies union material, length, and movement values. The final choice should be made against the project’s connection, size, material, movement, pressure, temperature, and fluid requirements.

THE PEOPLE

About the author

Richard Garcia

Richard Garcia is a Supply Chain Manager for Hebei Honest Industrial Group, responsible for ensuring the smooth flow of materials and products from our factory to customers worldwide. He expertly manages logistics, inventory control, and vendor relationships.

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Richard has 12 years of experience in international trade and is knowledgeable about import/export regulations. He often provides commentary for our market reports, detailing factors impacting lead times and pricing. He is focused on optimizing our supply chain for increased efficiency and responsiveness, making sure our customers receive products on time and within budget.

THE COMPANY

Hebei honest industrial group Co.,Ltd.

Hebei Honest Industrial Group Co., Ltd. is a professional manufacturer and supplier of industrial valves and accessories, wires and cables. As a group company, we are committed to developing long-term cooperative relationships with customers and continuously improving our production processes and processing technologies.…

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