SPLIT BUTTERFLY VALVES |
The Split Butterfly Valves are designed a to minimize atmospheric contamination during transfers of powders. High containment can be achieved during powder charging, discharging, and sampling . This applies particularly to dust free charging and discharging of laboratory, pilot scale and production process.
Construction and Working
The Split Butterfly Valvesconsists of two separate halves : a driving half (Active) and a driven half (Passive). The System is such that any passive will fit into any Active (non-pressure rated or pressure rated ) of the same size.Within the Active and passive assemblies are two halves of the butterfly type disc. The two halves (Active and Passive) mate together along their axis of rotation. Sealing between the discs is achieved via a metal-to-metal seal at the outside edge of the discs. The disc and shaft design of each half is a solid one-piece component, eliminating crevices and increasing strength when coupled.
The coupling process is achieved by inserting the Passive into the Active unit. This can only be successfully carried out in one orientation, as there are four, non equi-spaced pegs about the circumference of the Passive, which locate within slots in the Active body. When the Passive is correctly sitting in the Active, a sprung pin is depressed by one of the Passive pegs, this allows the locking ring to be rotated into the operating position. The locking ring is machined with four cam angles, which force the Passive further down into the active body. This enables the seats on the Passive & Active to come together to form a seal. The disc sealing element is elastomeric which precisely locates into the body and is not bonded, enabling easy removal, cleaning, and replacement
Both Active and Passive units are fitted with mechanical safety interlocks, which in normal operation prevent either Active or Passive from being opened when the two halves are not coupled together. Both manual wrench or actuation designs are offered.
Advantages of the contamination free isolation valve systems :
•Full protection for operator, product and environment.
•No cross-contamination .
•Reproducible containment levels over long periods.
•Quick docking and undocking cycle (<10sec)
•Extremely low-wear operation
•Quick and easy disassembly/ reassembly for cleaning/ inspection
•Flexible, manual and fully automated operation possible.
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