Leak-Proof
D/A's patented cone spring design maintains a pre-load on the
packing from the bottom side to fully compensate for temperature and
pressure fluctuations. This provides a maintenance free
fugitive emission control system.
Use of a high-tech, ceramic ball - results in reliable,
self-healing, bubble-tight closure.
Safe
D/A's bonnetless valve design prevents dangerous process
blow-outs caused by broken off or accidentally unscrewed
bonnets. This superior design eliminates the necessity for
a bonnet locking device...because there is no bonnet.
Long Life
The packing nut is provided with a locking bolt that
maintains the factory tested seal loading.
Seals above and below stem threads keep out
contamination and seal in lubricant, thus controlling the number 1
cause of valve failure ... lubricant failure.
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