New Raw Materials Improve Packing Sealing Efficiency

Abstract

End-users and OEM’s using or manufacturing on/off and control valves expect a permanent and effective increase in service life together with an increased sealing capability while at the same time minimizing maintenance concerns. Developing materials which provide consistency and repeatability are essential characteristics to optimizing valve performance.

“New Generation” materials and yarn allow us to meet this growing demand while complying with the requirements related to chemical purity and an increased level of safety to both plant workers and equipment in the nuclear environment. Through R and D initiatives and developments in new and improved raw materials; a new mechanical packing generation which optimizes friction coefficients and extended life cycle has been introduced to the industry. Lower friction values drastically optimize actuator effort and size improving efficiency for stem operation with significant improvements in flow control of fluids. Combined with new and improved procedures (installation, torque levels and consolidation recommendations), this new packing generation has provided significant improvement in the mechanical behavior of packing materials (independent tests carried out in collaboration with AECL and CETIM) this has provided the opportunity to develop successful Valve Enhancement Programs which offer improved efficiency, valve operation and repeatability. These NEW generation yarns are available with or without wire reinforcement depending on specific operating parameters and conditions.

The purpose of this presentation is to demonstrate that new generation material(s). Which are available to the industry for AOV, MOV and Manual valves?

• To highlight the steps taken in R&D and manufacturing contributing to the much improved yarns and finished packing products;


• Comply and are designed to meet the stringent requirements in the nuclear industry;


• Simplify valve maintenance without risk to safety or performance;


• Increase service life of packing due to new yarn technology and improved manufacturing practices;


• Increase sealing efficiency of valves to develop consistent valve performance;


• Highlight the mechanical properties of New Generation materials when compared to conventional materials;


• Discuss the methodology behind new generation arterials and the specific applications where “added value” has been brought to the industry;


• Supportive test data and sample material will be available upon request.