In the fluid pipeline system, the valve as a control component, mainly plays the role of isolating equipment and pipeline system, regulating flow, preventing backflow, regulating and discharging pressure. Therefore, in the specific production process, it is particularly important to choose the right valve. This also requires technical personnel to have a correct understanding of the characteristics of the valve, and clearly select the steps and standards of the valve.

In order to properly select valves, designers and technicians can follow the STAMPED method, taking into account such operating conditions as size, temperature, application, medium, pressure, end or joint, delivery, etc. This can effectively guide industrial fluid and analytical sampling system professionals in selecting the right valve product.

Step 1: Size

The diameter of the valve determines its flow rate, which needs to correspond to the expected or required flow rate of the system. The manufacturer will provide the flow coefficient (Cv), which represents the relationship between the pressure drop at both ends of the valve and the corresponding flow rate.

The flow coefficient (Cv) is the amount of water (in gallons) flowing through the valve at a temperature of 60°f with a pressure drop of 1 psi/min. For compressible fluids such as natural gas, calculating and using the Cv parameter to predict the flow rate is more complicated, but it is still an effective way to choose the valve diameter for a given application.