What is the standard opening rate for the 81 AF-8, nonsurge check valve (CV)?

The standard opening rate for the 81 AF-8 nonsurge check valve is established at 20 seconds. This rate is critical for ensuring that the valve opens smoothly, preventing water hammer or surge pressures in the system that could cause damage. The 20-second timeframe allows the fluid to flow properly without causing abrupt changes in pressure, which is essential for the efficient operation of water and fuel systems. This specific timing is in line with industry standards, which prioritize stable flow dynamics and the longevity of system components. Proper understanding of the valve's opening rate is crucial for effective system design and maintenance, ensuring that operators can anticipate and manage flow-related challenges appropriately.