Dynamic Sealing at Low Temperatures[R]
Presentation Overview• What happens to elastomers at low temperatures?• Static sealing • Dynamic sealing (slow speed, ¼ turns)• Summary of factors that influence results
Presentation Overview• What happens to elastomers at low temperatures?• Static sealing • Dynamic sealing (slow speed, ¼ turns)• Summary of factors that influence results
Main issues Permanent monitoring of the tightness of the stem sealing Not only as a snapshot under testing conditions or under operation conditions elaborately with sniffing equipment Monitoring in all …
Federal Judiciary Low-E Consent Decrees• Low-E Valves• Method 21 Leak Monitoring In-situ• VOC 100 ppmv maximum• LDAR (Enhanced) Program• 5 year warranty or performance statement• Fugitive Emissions have not received …
Penetrant systems are to be classified as follows …
Why meshing of valve subcomponents is more and more critical
Valves are more and more subjected to higher pressure or thermal stresses
Pressure up to 20000 psi – Cryogenic or high temperature – Vacuum
New production technics, like Additive manufacturing, are introducing more critical geometries and surfaces
Finite Element Analysis are used more and more to prevent testing failures
Raw material costs are pushing valve manufacturers to guarantee excellent performances with lither valves meaning thinner subcomponents
Type of butterfly valves (DOBV vs. TOBV)Main sealing technologies for TOBVLamellar seal principleConcept weaknessesHow to reduce leak paths with lamellar seals?Design optimization:Lab test examples & results
Valves can be designed tailored to plastic to achieve advanced safety and added value Maximum corrosion protection Safe operation with high cycle numbers Reduced maintenance costs High user friendliness