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Air Cycling Valve

Air Cycling Valve
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The 1196 Air Cycling Valve is intended for use in pulse-fired burner systems, such as StepFire™, or any other type of application where it is desired to cycle between a low and a high flow rate with an overall cycle time of approximately 4 seconds. As such, the valve is not designed for tight shutoff, although the beveled disc design enables leak rates that are quite low. High and low fire adjustments are a standard feature of the 1196. The high fire adjustment is a coaxial, threaded knob beneath the diaphragm case that makes fine tuning simple and dispenses with need for a butterfly valve upstream. The low fire adjustment is via a set screw that acts directly on the valve disc for maximum repeatability. Both adjustments are provided with locking nuts to secure them into position. The 1196 Air Cycling Valve has the added safety feature of failing closed in case of air blower failure. This minimizes the risk of back fluing high temperature combustion products. The valve also fails closed on loss of electric power or if the actuator diaphragm ruptures. The 1196 Air Cycling Valve uses an elliptical disc. This makes the valve more responsive especially near the closed position. It is also intrinsically more forgiving in dirty combustion air environments. This is because the disc swing near the inside wall of the body is minimized and is not at a right angle to the wall, thus minimizing the possibility of the valve disc getting wedged within any residue that accumulates on the inside wall. The elliptical disc further has the advantage of a shorter stroke (45° max.) which reduces the wear on the shaft. The high flow and linkage adjustments are all enclosed in a housing that protects them from tampering or accidental change, and also acts as a background for an accurate and easy to read position indicator. The valve sizes, dimensions, and weights are shown on back. Valve sizes M" through 2^" are offered in cast iron hex bodies with threaded ports for easy installation. The 3" and 4" sizes are offered in cast iron round bodies with threaded ports. The discs are made of steel. Shafts are made of stainless steel. 2 psig (shock pressures up to 4 psig) 131 F -20 F 194 F* 110-120 VAC, 50-60 Hz 10.1 W, 25 VA holding, 50 VA inrush 1-2 sec. 1-2 sec. 10 osi Cast iron - M" through 4" Steel Stainless steel Vi ton Maximum Inlet Pressure Maximum Ambient Temperature Minimum Ambient Temperature Maximum Fluid Temperature Voltage Power Opening Time Closing Time Minimum Pressure for Nominal Response Times Materials: Body Disc Shaft Elastomers * For fluid temperatures higher than 194 F contact North American.

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The normally open 3-way 1/4" solenoid valve used on the 1196 valve is rated at 110 VAC. The power consumption of this solenoid is at least 50% lower than that of direct actuating solenoids, reducing installation cost by allowing the use of lighter gauge wire. 24 VAC solenoids and normally closed solenoids are available as options at additional cost. However, please note that we do not stock special solenoids and that the delivery time will be affected accordingly. atmosphere and a short piece of tube or pipe must be installed in the port, pointing down, to avoid plugging with dust and dirt....

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