Slip-on flange (loose flange)

The flange can slide over the fitting without being fixed to the hose body; it facilitates easy alignment during installation and accommodates thermal expansion and contraction as well as frequent disassembly and reassembly; it is commonly used for low-pressure applications and large-diameter hoses.

Category:

Flange

Email:

sales@jxrubberhose.com

Phone:

+86-15631895830

Product Inquiry

Core Structural Features

The flange can slide freely over the metal fitting of the rubber hose, without being permanently bonded to the hose body or the fitting via vulcanization, welding, or other fixed connections; sealing is achieved solely by bolt‑induced clamping, allowing for flexible alignment during installation.

Material Classification

1. Carbon steel loose‑flange: The most commonly used type, offering high strength and low cost, suitable for non‑corrosive media such as ordinary water, air, and low‑pressure hydraulic fluids.
2. Stainless steel loose‑flange (304/316): Highly corrosion‑resistant and rust‑proof, suitable for handling acidic, alkaline, and corrosive media in chemical, food, pharmaceutical, and marine environments.

Main Features

1. Achieve flanged connections between rubber hoses and metal pipes/equipment to facilitate fluid conveyance;
2. Rely on a sliding structure to compensate for the displacement caused by thermal expansion and contraction of pipelines, thereby reducing stress‑induced damage.
3. Easy to install and remove, requiring no complex tools, making it ideal for maintenance scenarios involving frequent disassembly and reassembly.
4. Flexible centering adjustment effectively addresses coaxiality deviations during pipeline installation.

Typical applications

1. Low-pressure water supply and drainage systems (municipal water network, industrial circulating water);
2. Connection of large-diameter ventilation and dust-removal ducts;
3. Low-pressure chemical medium conveyance (non-corrosive);
4. Temporary piping subject to frequent disassembly and reassembly, as well as piping used for equipment maintenance and connection.

Applicable operating conditions

Pressure: Low pressure (≤1.6 MPa, standard PN10/PN16 ratings, etc.);
Caliber: Large-diameter hose connection (DN50 and above, suitable for high-flow conveyance);
Temperature: Ambient operating conditions (-20°C to 80°C; can be extended with special materials);
Media: water, air, low-pressure non-corrosive oils, and common dilute chemical solutions, etc.

Visual description

1. Overall structure: The main body is a circular flange with a central hole; the hole diameter is slightly larger than the outer diameter of the rubber hose’s metal fitting, and the flange can slide axially along the fitting.
2. Installation procedure: After the flange is slipped over the hose fitting, align it with the mating pipe flange; insert the bolts through the flange holes and tighten them to ensure a tight seal by bringing the sealing surfaces into contact.
3. Detailed features: Flange faces are typically raised face (RF) or flat face (FF), paired with rubber gaskets, and feature no welded or vulcanized attachment points, resulting in a simple and streamlined design.

Selection Supplement

1. Advantages: high disassembly and assembly efficiency, excellent centering performance, accommodates thermal expansion and contraction, and moderate cost;
2. Limitations: Not suitable for applications involving high pressure, high temperature, severe vibration, or flammable and explosive media.
3. Recommended pairing: Use in conjunction with metal fittings for rubber hoses and flat washers/rubber gaskets, in accordance with flange standards such as GB/T 9119 and HG/T 20592.

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