01 April 2009
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Pin adds security to valve systems

Anson, a supplier of valves and flowline equipment to the oil and gas industry based in Gateshead, Tyne & Wear, recently approached Specialty Fasteners & Components seeking to discover a more secure way of securing control wheels to valve stems.

It had been using a lynch pin with a snap ring that clipped over the valve stem to secure it in place.

"This worked but the pin is not locked unless the snap ring is installed correctly", points out SFC's managing director Peter Boote. "Anson wished to retain the style and action of the lynch pin since its customers are familiar with the system, but more security was required without the need to use tooling." As a result of consultations between the two companies it was decided that a lynch pin should be designed and manufactured from 316 stainless steel.

"This incorporated the SLIC pin wedge assembly feature which allows exactly the same installation but also provides added security."The SLIC pin is designed as an assembly fastener rather than a quick-release fastener because the spring-loaded wedge – unlike the ball on a detent pin - will not depress as the pin is pulled to remove it, and it retains the pin securely in place", explains Peter Boote.

"However, this pin can be removed manually by depressing the wedge below the diameter of the pin and then pulling the pin
out. "This feature allows the SLIC product to be assembled by
Anson as previously by simply pushing it through the hand
wheel and valve stem, then flicking the snap ring over. It locks
securely in place with the snap ring acting as a secondary lock."

Meet Specialty Fasteners & Components at the Fastening & Assembly Solutions Exhibition, RAF Museum Cosford, 29th April 2009

Paul Gay


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