The second design is the welded bonnet, with a threaded and seal welded joint. Bellows sealed valves are available in all gate or globe design configurations.

Hydroformed bellows are produced by forcing a metal tube to expand beneath hydraulic pressure inside a bellows-shaped mould, and assume the convoluted form of the mould. Welded bellows may be fabricated from quite a lot of exotic metals and alloys, whereas fashioned bellows are limited to alloys with good elongation – brass being a main instance. Welded bellows are not fabricated from brass because of its essentially poor weldability. Other advantages to welded bellows embrace compactness , capability to be compressed to solid peak with no damage, resistance to nicks and dents, and dramatically greater flexibility.

Here the bellows enable the contacts to move in and out whereas maintaining a dependable gasoline-tight seal. Electroformed bellows may be produced of nickel, its high-strength alloys, and copper.

Designed to fulfill the extreme circumstances of fuel and liquid systems, our bellow valves provide outstanding high quality and excessive reliability. Multipurpose valves easily accommodate full system pressures with stability and safety.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Bellows seals are a wonderful alternative for applications where the method fluid is incompatible with widespread elastomers or the place the cost of custom O-Rings is prohibitive. The valve materials chosen ought to be suitable with the operating situations of the system, including the fluid media, temperature, and stress.

Common supplies employed include chrome steel and nickel-based super alloys. During the valve stroke the bellows compress or increase together with the sliding stem’s linear motion with little to no friction. Incorporated in 1967, Conval has now grown to be the premier manufacturer of top of the range, high pressure forged steel valves on the earth.