2″, 3″, 4″, 5″, 6″
The heart of the Model 441-57S is the “Roll-Out” diaphragm. The 441-57S is a spring regulator with performance which approximates that of a pilot operated regulator. The “Roll-out” Diaphragm makes this exceptional performance possible because its action reduces “droop” to a minimum (“droop” being fall off in outlet pressure as a spring regulator opens to increase
The action of the “Roll-Out” diaphragm differs from that of the conventional diaphragm in the manner in which the change in effective area occurs. Where the effective area of a conventional diaphragm would increase as the regulator opens, the “Roll-Out” area decreases. Conversely, where the area of the conventional diaphragm decreases during closing, the “Roll- Out” area increases. The compressive force of the spring works to open the regulator and is balanced by the opposing force of outlet pressure on the diaphragm which provides the closing force.
As the regulator opens, the compressive force of the spring decreases. However, as this spring force decreases, there must be a
corresponding decrease in the opposing force from the diaphragm. For this opposing diaphragm force to decrease, either the effective area or the outlet pressure must decrease. Herein is the essential difference; with a conventional diaphragm the outlet pressure must decrease, where as with the “Roll-Out” diaphragm it is the effective area that decreases, permitting the
outlet pressure to remain constant.
The operation actually is quite simple, yet the action of the “Roll- Out” diaphragm is so effective that “droop” is practically eliminated. The Model 441-57S provides constant pressure regulation not previously possible in a “pounds to pounds” spring regulator. It approaches pilot performance, and, in addition, offers the further advantages of simplicity, dependability, freedom from freeze-up, and exceptionally fast response.
2″, 3″, 4″, 5″, 6″
The 441-X57 is unique in a high pressure regulator. It features the same “Roll-Out” diaphragm principle that has achieved such remarkable success in the widely used 441-57S and 461-57S Regulators.
The 441-X57 offers pilot performance with spring regulator simplicity. The “Roll-Out” diaphragm makes this outstanding performance possible by eliminating that old gremlin– “Droop.” “Droop” means rough regulation, wide fluctuation in pressure control as flow varies. It is the result of spring effect plus diaphragm effect.
The “Roll-Out” diaphragm changes this. By eliminating diaphragm effect and neutralizing spring effect, “droop” is reduced to insignificance. The result–smooth, constant pressure regulation. It comes amazingly close to the control performance of the pilot operated regulator.