What is the difference between a metering and a non-metering (Direct Acting) valve?
The metering valve utilizes metering servomotors that are equipped with timer assemblies that can adjust the length of time the valve will run when the pneumatic pushbutton is actuated.
How can you visibly tell the difference between a metering and non-metering valve?
The easiest way to tell the difference between metering and non-metering valves is to look at the servomotors. The metering valves have servomotors with a black top plate and a timer assembly mounted on the side (
see fig. 2.1). The non-metering valves have servomotors with a gray top plate and no timer assembly (
see fig. 2.2).
Can you set the runtime to be longer than 60 seconds?
Yes, but timing longer than 60 seconds is not guaranteed to be consistent for every activation. Consistency can be maintained when timing is set between 5-60 seconds.
What is the maximum distance between a pneumatic pushbutton and a valve?
The maximum distance is 10 feet (3 m). Distances that exceed 10 feet can result in short and/or inconsistent runtimes.
What is the maximum water temperature for an Air-Control valve?
If the valve has a flow control (flow restrictor), then the maximum temperature is 130°F (54°C). If the valve does not have a flow control, then the maximum temperature is 180°F (82°C).
