I. Basic Specifications

Item Typical Values Notes

Nominal Diameter 100mm (DN100) Equivalent to 4-inch imperial specification

Structure Single-sphere + flange connection Sphere materials: NBR, EPDM, or silicone rubber; flange: Q235B/304 stainless

Working Pressure 1.0MPa / 1.6MPa (optional) 1.6MPa for high-pressure type, require additional notation

Burst Pressure ≥3.0MPa (for 1.0MPa working type) Safety factor ≥3 times

Temperature Range -15℃~+80℃ (NBR) / -20℃~+150℃ (EPDM) Silicone rubber withstands +200℃; FKM (fluororubber) for +250℃ on request

II. Dimension Parameters (mm)

Parameter 1.0MPa Standard 1.6MPa High-Pressure Installation Reference

Sphere Length 180 200 Length affects compensation; high-pressure type increases sphere thickness

Flange OD (DN100) 220 220 Complies with GB/T 9119 (PN10/PN16 flanges)

Bolt Circle Diameter 180 180 4 holes evenly distributed; bolt size M16 (1.0MPa)/M18 (1.6MPa)

Flange Thickness 18 20 High-pressure flanges are thickened for strength

Total Length (with flanges) 250 270 Reserve ≥300mm installation space to avoid over-stretching

III. Displacement Compensation Capacity

Displacement Type 1.0MPa Type 1.6MPa Type Application Scenarios

Axial Extension ≤+10mm ≤+8mm Compensate thermal expansion (e.g., steam pipeline heating by 50℃)

Axial Compression ≤-15mm ≤-12mm Absorb axial thrust during pump start/stop

Lateral Displacement ≤±10mm ≤±8mm Adapt to installation deviations or foundation settlement

Angular Displacement ≤15° ≤12° For angle compensation in elbows or branch pipes

IV. Material and Performance Parameters

Component Common Materials Performance Characteristics

Sphere Body NBR (Nitrile Rubber) Oil-resistant (hydraulic oil, fuel), -15℃~+80℃, suitable for industrial oils

EPDM (Ethylene-Propylene) Acid-alkali resistant (pH 2~13), steam-resistant, for water supply/HVAC

Silicone Rubber High-temperature resistant (+200℃), ozone-resistant, for food-grade pipes

Reinforcement Layer Polyester fabric + steel rings 4~6 layers enhance tear strength; steel rings prevent delamination

Flange Q235B (galvanized)/304 stainless 304 stainless for seawater/chemical environments; galvanized for anti-rust

Sealing Surface Flat Face (FF)/Raised Face (RF) RF face offers better sealing for high-pressure conditions

V. Standards and Certifications

National Standards: GB/T 26121-2010 (Rubber Joints), GB/T 12777-2019 (Metal Bellows Expansion Joints)

International Standards: ISO 10816 (Pipeline Vibration), ASTM D2000 (Rubber Component Specifications)

Special Certifications: FDA (food-grade), WRAS (drinking water), ATEX (explosion-proof, custom order)

VI. Selection and Installation Notes

Key Selection Points:

Medium properties: NBR for oils, EPDM for acids/alkalis, silicone for high-temperature steam;

Pressure fluctuations: Choose 1.6MPa high-pressure type with limit devices for frequently starting/stopping pumps.

Installation Requirements:

Tighten bolts symmetrically with torque controlled at 30~40N·m (for M16 bolts);

Avoid direct sunlight or sharp objects; add sun-protective coating (e.g., neoprene) for outdoor use;

Install metal flexible joints on the pump side to buffer high-frequency vibrations.

VII. Typical Application Scenarios

Industrial: DN100 hydraulic oil pipes (NBR, 1.6MPa) compensating pump vibration;

Building: DN100 firewater pipes in high-rises (EPDM, 1.0MPa) absorbing pump start-up thrust;

Food: Beverage production lines (silicone + 304 flanges, FDA-certified), resistant to 80℃ and non-toxic.

These parameters enable precise selection of DN100 single-sphere rubber flexible joints based on specific conditions (medium, pressure, temperature, displacement), ensuring pipeline sealing and stability. For custom requirements (e.g., vacuum resistance, anti-aging), confirm materials and design with manufacturers in advance.