Double eccentric stainless steel with PTFE seat Butterfly valves (UB series) SERIES

Double eccentric stainless steel with PTFE seat Butterfly valves (UB series)

Maximum service pressure10UB1.4MPa16UB (size 1½” to 12″)2.0MPa16UB (size 14″ to 24″)1.4MPa150UB1.9MPaService temperature rangePTFE seat-29℃ to +160℃Carbon filled PTFE seat-29℃ to +200℃Wall thicknessASME B 16.34 Class 150Face to face dimensions6″ and smallerISO5752 Short8″ and largerISO5752 MediumCoupling flanges10UBJIS 10K16UBJIS 16K150UBASME Class 150 PartsASTM MaterialsJIS MaterialsBodyA351 Gr.CF8*1SCS13A*1Stem304SSDiscA351 Gr.CF8*1SCS13A*1GlandA351 Gr.CF8*1SCS13A*1Seat ringPTFE*2Seat retainer304SSGland packingPTFEGasketPTFESet boldStainless SteelTaper pin316SSStem bearingMETAL BACKED PTFEGland boltsStainless SteelThrust washerPTFEEnd plateA351 Gr.CF8SCS13AEnd plate bolts304SS*1.CF8M(316)/SCS14A(SUS316) is available as an option.*2.Carbon filled PTFE seat rings are optionally available. The valve’s stem is designed eccentric to both the center of the seat ring (by X) and the center of the valve bocy (by Y), which makes the clearance C between the seat ring and the disc seat surface on its fully open position (Fig. 1). Disc seating surface is spherically machined and contacts PTFE seat tightly through 360℃ for leak-free service. All these help minimize frictional wear of seat rings and reduce the valve operating torque considerably. Seat rings are made of PTFE with stainless steel supporter. Furthermore, double-eccentric kinematics relieve seat ring from damage or wear which is a rather usual problem of conventional butterfly valves. This makes the service life twice as long