Valves with Active Leak-Off Designs - SealOE
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Valves with Active Leak-Off Designs
Problem
Valves with active leak-off that require a double set of packing are difficult to seal. The double packing set makes getting the required load and consolidation to the lower packing rings difficult. High friction is also an issue. The use of metal lantern rings can cause stem scoring.
Solution
Use 2-3 packing rings above the lantern ring and 3-4 rings below. Use 25% higher stress than a normal single packing system. Consolidate the lower packing set first before installing upper packing set. Use a high strength carbon lantern ring to eliminate the chance of stem scoring caused by metal lantern rings.