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Product List for PTFE Components

PTFE SEMI-AUTOMATIC PACKINGS

‘V’ Rings
These seal rings are normally used in sets as valve stem or reciprocating pump packings. A set is usually made up of a male and female end rings for ease of seating in the gland.

Two standard ‘V’ forms are used. The first 60° and 90° levels for low and medium pressure service, and the second has 90° levels only, for high pressure service. In both cases a central gap is formed to give the flexure required under pressure.

The number and combination of rings per set is dependent upon the pressure and the depth of the gland.

V Ring Design

These seals are semi-automatic, in that they are to some degree self-adjusting, being sensitive to pressure variation.

The operation is by lip sealing. By virtue of the deisgn, the force required to actuate the seal is the pressure operating against it, which means that it automatically compensates for any increase or decrease in pressure. This, coupled with the low coefficient of friction of the material gives smooth running and keeps rod and shaft wear to a minimum.

Crossley Crossflon ‘V’ ring sets are designed to operate at high +250°C temperatures in harsh chemical environments, and at the same time display very low coefficients of friction along with significant wear resistance.

In recent years, due to the introduction of new compounded PTFE materials, along with PEEK anti-extrusion rings combined into V ring sets, the operating parameters have been significantly extended along with life expectancy.

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