Oil & Gas, Chemical, Petrochemical, Power Generation, Marine, Offshore, Waste & Waste Management, Renewable Energy

Bellows units and assemblies are used in mechanical seals for marine applications such as pumps and propulsions units, chemical, food and beverage, mining and minerals, oil and gas, pharmaceutical and power generation. We specialise in the design and manufacture of high quality units used for equipment and product protection. Products are developed in conjunction with our clients’ engineers to ensure that all customers’ needs are fully met.

We have the versatility and expertise to satisfy the most stringent of design conditions and extreme environments. Bellows are custom designed to suit your application and can be designed to accommodate a wide variety of environments whilst achieving critical design criteria such as spring rate, effective area and fatigue life expectancy. Balanced bellows for safety relief valves are used to provide satisfactory valve performance when the developed back pressure becomes excessive. The balanced bellows design ensures that valve characteristics such as lift and relieving capacity are maintained. Additionally, the bellows serves to isolate the guide, spindle, spring and other parts contained in the bonnet chamber from corrosive fluids or media such as highly viscous fluid or slurry which could render the relief valve inoperative. The inclusion of bellows in the valve design enables the use of lower cost materials than would otherwise be required.

High quality bellows assemblies are supplied for valve applications worldwide. Bellows are produced by roll forming thin wall autogenously welded tube. Construction may be single or multi-ply, in thicknesses from 0.08mm upwards, and materials supplied include all grades of stainless steel, nickel alloys and titanium. Bellows sizes from diameter 12mm upwards to 600mm.

As part of our total commitment to the supply of bellows for valve applications there is continuous investment in
machinery and personnel at Bird Bellows. In order to meet the increasing demands of our customers we have implemented a lean manufacturing cell totally dedicated to bellows for valve applications.