Rubber Expansion Bellow

We manufacture hand crafted mandrel built & moulded rubber bellows to suit your application, specifications. The bellows are designed following the guidelines of the FSA (Fluid Sealing Association) Non-Metallic Expansion Joints Technical Handbook, ASTM F1123 - 87 Standard Specification for Non-Metallic Expansion Joints.

Effective compensation:

ShivamFlex® rubber expansion bellows (expansion joints) are widely used to provide efficient ways to relieve movement stresses, reduce noise, isolate vibration or to compensate misalignment. They are made out of several types of specially selected rubbers and are applicable up to more than 100°C and 40 Bar.

Absorbs axial and lateral movements:

ShivamFlex® rubber expansion bellows (expansion joints) can absorb axial and lateral movements and are suitable for cooling water, hot water, gases, oils, fats and other media. ShivamFlex® rubber expansion bellows can be delivered with or without inserts, limiters and/or connection flanges. The exact composition depends on the specific application and customers" wishes

Common applications:

Power generating stations, Oil & gas, Desalination, Cooling systems, Pumps, Chemical plants, Heating, ventilating and air conditioning, Shipbuilding, Off-shore applications, Water treatment plants, Sewage, Sanitary piping systems, Pulp and paper plants, Piping systems for chilled or hot water, Cooling systems power generation, Phosphate plants, Potable water, Food processing.

Construction:

Rubber Expansion joints are fabricated with an elastomeric tube reinforced with multiple plies of fabrics covered with synthetic rubber. The inner tube is made of natural rubber, synthetic rubber or blend of synthetic rubber. The fabrics are Nylon®, Polyester, Aramid or Kevlar®. An additional reinforcement to the fabric may be provided in the body of the expansion joint and may be solid metal rings or wire embedded in the rubber.

Materials:

Rubber bellow is manufactured from independent rubber layers and reinforcements that are vulcanized together after being molded or formed. With over 15 rubber elastomers available and the ability to further modify properties by compounding it can be challenging for non-specialists to select the most appropriate rubber polymer for their requirements. Our experts may assist our customers with material selection for a proper performance and to reduce the risk of failure. We are proficient to work with Natural & Special Synthetic Rubbers like Chloroprene – Neoprene, EPDM, EPDM – HT, Butyl, Hypalon, Nitrile, Viton, Silicone. Food Grade & Anti – Static Rubbers are also available.

Fabric reinforcements:

Standard constructions normally utilize high quality synthetic fabric like Nylon®, Polyester, Aramid or Kevlar®. Fabric plies are impregnated with rubber or synthetic compounds to permit flexibility between the fabric plies.

Metal reinforcements:

Wire or solid steel strings are imbedded in the carcass and are used as strengthening members of the joint. Flanges Carbon steel as standard. Also available in zinc plated or hot dip galvanized carbon steel, stainless steel, duplex, etc. Flanges drilled to EN, ANSI, JIS, AWWA standards or any specific dimensions.

Rubbers & Re-enforcements are selected as per media and working pressure. Sizes vary from 25 mm to 3500 mm (Nominal Bore) with required lengths.

G.A Drawing (Fig 1) Bellow with twin sphere (Fig 2).Bellow with single sphere. Sizes vary from 25 mm to 600 mm (Nominal Bore) with Standard lengths. Rubbers & Re-enforcements are selected as per media and working pressure. Steel flanges in mild steel (Galvanized), Stainless Steel are available with fasteners & control unit.

HVAC Systems:

Rubber expansion joints are used in heating, ventilation, and air conditioning (HVAC) systems to absorb thermal expansion and contraction caused by changes in temperature & pressure

Power Plants:

Bus Duct Bellows are also used in the Aluminum Electrical Ducting system in power plant which prevent transmission of vibration of electrical generators & take care of the thermal expansion and contraction of Bus Duct enclosure, civil construction during Bus Duct installation. There are four types of rubber bellows: square, rectangular, and rectangular convoluted, and oval. They are used as expansion joints in piping systems to accommodate thermal expansion, misalignment, vibration, and movements. Rubber bellows are also used in HVAC systems and as pump connectors. The type of rubber bellows you need depends on the application and the amount of movement that is required.

These expansion joints can be fabricated with single and multiple arches, or in a simple sleeve configuration, each for use with the clamped connection (clamps can be supplied, upon request). The sleeves is recommended for use in services with a maximum pressure of 1 Bar, and is well suited for loading and unloading processes, with outstanding performance when used for media containing solids. It is fabricated in standard and custom diameters for use with piping, elbows, or reducers. Regardless of accessories, such as liners and covers, it can absorb all of the movements in any one length of piping.

Hydraulic Pressure Tests, Tensile strength, Temperature resistance, Burst test, Cycle life test, Spring rate testing, Abrasion resistance, Movement (axial, lateral, angular) testing, Chemical analysis of the elastomers, Fluid and chemical compatibility testing, Electrical properties