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MDC Europe butterfly valves require only one-quarter turn
rotation of the handle to go from fully open to the fully
closed position. In the DN 16CF and DN 16KF flange series, a
spring loaded ball bearing becomes seated in an indent
providing a positive mechanical stop. All other size valves
employ a roll pin stop method.
These quick-acting butterfly valves feature an improved
sealing action. The opening in the body of the valve has been
machined at a slight angle to the plane of the flapper. The
flapper is set to rotate slightly off-centre. On closure, this
causes the sealing pressure to be applied more uniformly all
around the 0-ring. A reliable, positive seal is made and the
tendency of previous designs to roughen the surface of the
0 -ring and eject it from its groove is eliminated.
MDC Europe butterfly valves are low outgassing. All internal
surfaces are machined from solid stainless steel bar stock.
The handle is made of aluminium. A small 0-ring on the stem
prevents shaft leakage.
The valves are offered with a choice of CF ultrahigh vacuum
metal-seal flanges or ISO KF 0 -ring seal flanges.
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