Aventics controlair valve cx41/13/2023 ![]() This allows additional air to flow into the OUT line until air pressure acting on the diaphragm depresses it enough to allow inlet valve to close. When the outlet pressure reaches the value called for by the amount of operator movement, the air pressure acting on the diaphragm has moved it enough to let the inlet valve spring close the inlet valve and stop further increase in pressure.įurther movement of the CONTROLAIR Valve operator to increase pressure moves the valve assembly and again opens the inlet valve. This pressure compresses the spring beneath the diaphragm and forces the diaphragm downward. Further movement of the assembly opens the passage between the CONTROLAIR Valve's IN and OUT lines allowing inlet air to flow into the OUT line and to the upper face of the diaphragm.Īs the flow of inlet air into the line raises the air pressure in the OUT line, if also increases the air pressure on top of the diaphragm. Initial movement of the valve assembly closes the passage from the CONTROLAIR Valve's OUT line to atmosphere. Starting from decreasing pressure position, to increase the OUT pressure of an "H" CONTROLAIR Valve, its operator moves the valve assembly in contact with the exhaust valve seat. Further movement of the lever operates the pressure regulating portion.Ī complete description of the operation for each CONTROLAIR Valve is in the Service Information publication for that valve. The exhaust valves in these three-way valves are closed by initial movement from "Neutral" of the CONTROLAIR Valve lever. In addition to having a pressure graduating valve, the HC-2, HD-2 and HE-2 CONTROLAIR Valves have one or two normally closed, non-graduating, three-way valves, When the lever of one of these CONTROLAIR Valves is moved 10º or more from its "Neutral" position, it opens one of the 3-way valves and holds it open. Should leakage or a temperature variation occur that would change the outlet pressure called for by the CONTROLAIR Valve's operator position, this deviation in pressure opens either the CONTROLAIR Valve's supply valve or its exhaust valve to restore the correct pressure. When the CONTROLAIR Valve is in decreasing pressure position, the inlet valve is closed and the exhaust valve is open to vent the OUT pressure to atmosphere, inlet pressure is on top of the closed inlet valve. The ease with which an "H" CONTROLAIR Valve is operated is obtained by creating a differential between the counterbalanced air pressure and spring forces within the valve and by using this differential to open or to close valves. ![]() The sensitive, precise pressure control of the "H" CONTROLAIR Valve and its ability to change delivery pressure in small increments are obtained through the use of a large responsive diaphragm.
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