Concentric Butterfly Valve

● Simple and compact structure, low operating torque. 90 ° turn to open quickly.
● Replaceable valve seat, with reliable & bidirectional sealing performance.
● The flow characteristics tend to be straight, with better adjustment performance.
● Self lubricating bearing in PTFE, al-bronze or stainless steel lined PTFE, with low friction coefficient and easy operation.
● ISO 5211 top flange to coupled with manual, electric or pneumatic etc all types of actuators.
● Multiple sealing design in shaft seal system, to ensure shaft no contact with service medium to achieve dry shaft.
● Stepped shaft design retained by a circlip to achieve blow-out proof shaft.
● The connection between shaft and disc is precisely processed to eliminate the linkage lag.
And pinless two-piece shaft(one-piece available for request) design will ensure the valve shaft is completely isolated from the medium. Used for corrosive medium, common shaft material could be used instead of high
anti-corrosive material so as to reduce the production cost.
● The disc edge is processed with spherical surface and polished to ensure low operating torque.
Streamlined disc profile will ensure the max.flow performance to min. the pressure drop.
● The valve seat and body are positioned with single or double grooves to ensure no displacement and looseness during valve opening.
● The valve seat outside surface designed with a circular arc will accurate the positioning and be easy for replacement. No need of flange gasket during valve installation.