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News Release from: Spirex Plasticating Systems and Solutions | Subject: QSO Non-Return Valve
Edited by the Engineeringtalk Editorial
Team on 08 December 2005
Spirex and Glycon in valve deal
Spirex and Glycon enter exclusive worldwide agreement to market and sell the QSO (quick shut-off) Non-Return Valve.
Spirex and Glycon have entered an exclusive worldwide agreement to market and sell the QSO (quick shut-off) Non-Return Valve The agreement became effective in November 2005
This article was originally published on Engineeringtalk on 9 May 2003 at 8.00am (UK)
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Compared with conventional ball-and ring-check valves, the QSO is claimed to deliver higher flow and quicker shut off.
This combination ensures rapid material shut off for part weight consistency and a smooth, high-flow profile to prevent material degradation.
The results are higher quality parts, fewer rejects, improved yield and a better return on every pound of material.
At the moment of injection forward, material pressure on the broad face of the self-centring poppet drives it back against the valve seat, shutting off plastic flow.
The poppet only moves a fraction of a centimetre, so shut off is virtually instantaneous and part weight stays consistent, varying less than 0.1% with many materials.
During recovery, melted polymer enters the valve through material entry ports and pushes the poppet forward into an open position.
Evenly spaced axial grooves create a smooth, wide-open material-flow path through the valve.
There are no sharp corners or obstructions, and no opportunity for material to hang up, burn or degrade.
Even sensitive engineering materials such as polycarbonate and PET run smoothly, with low acetaldehyde levels and high intrinsic viscosity.
The three-piece design consists of the valve body, the internal poppet and a threaded retaining ring, all made from heat-treated and nitrided tool steel.
Precision grinding of the valve sealing surfaces cuts friction on mating surfaces, and all interior surfaces are highly polished for smooth plastic flow.
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