K521/2-inch to 2-1/2-inch "Y" pattern diaphragm valvesGlass-filled thermoplastic body and capFeatures & BenefitsLarge Seat opening and high lift-disc for higher flow rates at a lower pressure lossSeparate flow and control chambers permit positive closing without springs; and only nominal cost for spring assist opening for low-pressure and self-draining applicationsCost-effective solution both in initial cost,Website: , as well as lifetime maintenance expensesSeparate diaphragm chambers protects the diaphragm from the flow stream, while allowing the valve to be serviced in-linePre-formed, stress relieved diaphragm minimizes fatigue, maximizes valve responsiveness and diaphragm lifetimeAll internal parts in contact with media are made of composite materialsCan be actuated with either air or water as control fluidDesigned for water treatment applications including those requiring acids, caustic and harsh chemicals that would rapidly corrode medtal valvesFeatures & BenefitsLarge Seat opening and high lift-disc for higher flow rates at a lower pressure lossSeparate flow and control chambers permit positive closing without springs; and only nominal cost for spring assist opening for low-pressure and self-draining applicationsCost-effective solution both in initial cost, as well as lifetime maintenance expensesSeparate diaphragm chambers protects the diaphragm from the flow stream, while allowing the valve to be serviced in-linePre-formed, stress relieved diaphragm minimizes fatigue, maximizes valve responsiveness and diaphragm lifetimeAll internal parts in contact with media are made of composite materialsCan be actuated with either air or water as control fluidDesigned for water treatment applications including those requiring acids, caustic and harsh chemicals that would rapidly corrode medtal valvesAccessories & OptionsSeal and diaphragm materials availableSpring assist (open or closed)Normally open or closedPosition indicatorK55 isolated bonnet valve