Design Features
Various U.S. and Foreign patents and patents pending.
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.
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.
GP Valve Design Illustration

General Purpose Demo
D/A's General Purpose valve may appear to be a basic valve design from the outside, but it is far from that on the inside.  Click the link above to see a multimedia demo showcasing D/A's superior valve design.  The demo includes animated demonstrations and audio.  MacromediaŽ ShockwaveŽ Player is required to view the demo.  If you have already seen the demo, then just click the link to the right and enter our General Purpose online catalog.
General Purpose Online Catalog