These products were developed by Paul R. Ostand for Appalachian Controls Environmental (ACE) of Charleston, WV. They are both direct and pilot operated pad valves as well as a unique (pad-depad) valve.
These products are used for nitrogen gas blanketing and venting systems in industries such as chemical, pharmecutical, food processing and computer chip manufacturing. Pad valves are gas make-up valves that supply gas to the vapor space of a tank to maintain a predetermined pressure. Depad valves, or vent valves, remove gas from the vapor space of a tank in order to prevent the pressure from going below a predetermined maximum.
They were designed as part of a project to produce an entirely new line of gas blanketing and venting products. This successful effort resulted in three US and one UK patents.
They are now manufactured by Fisher Controls. While they were marketed as tank (nitrogen blanketing) valves, they are basically pressure regulators for very low gas pressure control.
Further information on the subject of tank blanketing can be found by following the various links on the home page. HOME
 ACE 95jr tank blanketing valve for regulating gas pressures down to 0.5 in.wc |
 ACE95 Tank Blanketing Valve, 1” body size. For regulating gas pressures to 0.5 inch w.c. |
 ACE95SR Tank Blanketing Valve 2” body size For regulating gas pressures to 0.5 inch w.c. |
 ACE97 Tank Blanketing & Venting Valve, ½” thru 4” body sizes. For regulating gas pressures to 0.5 inch w.c. and venting to 4 psi |