Type N Style I ball joints have been widely accepted since the design was introduced in 1960. They are commonly used in steam, hot water, chilled water, petroleum and chemical piping to absorb thermal expansion. Common applications are tank and building settlement, seismic isolation, bridge movement and wave motion compensation in addition to steam and hot water distribution systems.
Standard models are available as weld end or flanged with optional seal materials. The total flex angle varies with size from 15º to 31º. Refer to Column 3 of the Dimensional Data below.
Standard materials are wrought steel for the ball, case and retainer. The ball sealing surface is protected with crack free chrome plating and coated with molybdenum disulfide.