What pressure does a properly functioning positive cutoff valve supply when the spray flow is stopped?

A properly functioning positive cutoff valve is designed to maintain a specific pressure level when the spray flow is stopped. This type of valve ensures that there is a consistent and reliable pressure in the system, which is crucial for maintaining the integrity of the spraying operation and preventing backflow or unintended leakage of chemicals.

The term "high positive pressure" indicates that the valve maintains sufficient pressure in the line to ensure that the system remains primed and ready for operation. This helps in preventing any potential issues such as air entering the system, which could disrupt the flow or affect the application of the sprayed material.

In contrast, other pressure levels would not adequately support the necessary conditions for safe and effective application. Low negative pressure, for instance, would indicate a vacuum condition that can lead to the introduction of contaminants and disrupt the system. Medium positive pressure may not be sufficient to ensure that the system remains sealed or primed. Lastly, variable pressure would introduce inconsistencies that could negatively impact the reliability of the spray application. Thus, the high positive pressure provided by a properly functioning positive cutoff valve is essential for optimal operating conditions.