testing 1st step


Valve performance testing verifies that valves operate safely, reliably, and in line with required standards before they are put into service. At Wyeco Auto Valve Co., Ltd., we provide testing programs like Factory Acceptance Testing (FAT), to confirm compliance with industry requirements. FAT usually bundles several checks, namely leak testing, pressure testing, functional checks, endurance testing, and sometimes CV testing. CV testing is required when knowing the correct flow capacity is crucial.

 

Why Valve Performance Testing Is Important

Valves used in industries such as oil and gas, petrochemicals, power generation, and water treatment must perform under rigorous conditions. Performance testing subjects valves to controlled pressure and flow to confirm that they seal properly, avoid leaks, and operate within specified limits. By identifying potential weaknesses before installation, testing reduces the risk of costly downtime and ensures valves comply with relevant standards. For customers, this provides peace of mind that every valve will operate safely and reliably throughout its service life.

 

Cv Testing 

Cv testing measures the flow coefficient (Cv), which indicates how much fluid passes through a valve at a given pressure drop. It provides a clear, quantifiable way to evaluate flow capacity and verify that a valve will meet the system’s operational requirements. For engineers, Cv testing is essential for accurate valve sizing and selection, helping to avoid issues caused by undersized or oversized valves. For operators, this CV sizing program ensures stable flow control, reduced energy losses, and improved overall system efficiency.

 

The Formula for Cv 

The flow coefficient is calculated using the equation:

Cv = Q√(SG/∆P)

 

Where:

  • Cv = Flow coefficient
  • Q = Flow rate (gallons per minute of water at 60ºF)
  • SG = Specific gravity of the fluid
  • ∆P = Pressure drop across the valve (psi)

 

By applying this formula during testing, engineers can confirm that the valve’s actual flow capacity matches design expectations. This ensures that each valve delivers reliable, efficient performance across its full operating range.