Parker Double Chamfered Precision Cut Seal or can be a replacement for an O-ring and back-up assembly. Parker T-Seals are available to fit a number of standard AS568 O-ring grooves and may directly interchange with O-rings in most cases. for example, the Parker T-seal is specifically designed to prevent spiral failure and its use will allow for increased tolerances because of built-in anti-extrusion back-up rings. Consider the use of internally lubed O-rings. Check for out-of-round components (Cylinder Bores especially).ģ. Improve surface finish of sealed assembly at dynamic interface (Cylinder Bore, Piston Rod).Ģ. Some solutions for spiral failure include:ġ. Gland Dimensions for Industrial Reciprocating O-Ring Seals calculate the impact and measure the value for people, organizations and market. O-ring sizes outside of recommended dimensions for reciprocating pistons (See chart below): Spiral Dynamics: a visionary set of values for humanitys sustainable. Improper installation (O-ring pinched or rolled ).Ĩ. Wide clearance combined with side loads.ħ. Some conditions which cause an O-ring to slide and roll at the same time may be:Ģ. The resultant twisting of the O-ring as the sealed device is cycled finally causes the seal to develop a series of deep spiral cuts ( usually at a 45° angle) on the surface of the seal. This type of O-ring failure is caused when the seal becomes “hung-up ’’ at one point on its diameter (against the cylinder wall ) and slides and rolls at the same time. Spiral failure of an O-ring is often found on long stroke hydraulic piston seals and to a lesser degree on rod seals.
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