The Study On Flux Control Characteristic Of Control Butterfly Valve

The study on flux control characteristic of control valve is widely used in fluid control projects. Because of nonideal flux control characteristic, low control precision and narrow range, general butterfly valve can only be applied to a simple switch control.This thesis designs a valve plate with multi-hole and groove, and installs it on a general butterfly valve. According to engineering calculation formula of valve, we propose a set of design idea about the rule of flow projection weighted area and flow ability, to study the new control butterfly valve. A lot of three-dimensional numerical simulations are performed on the new valve with different plates. The RNG_κε turbulence model and SIMPLE scheme based on unstructured grid system were adopted in numerical simulation. Through simulation of the model at the different opening angles, the relationship between relative flux coefficient (Kvs') and relative valve opening (θ') are obtained, that is, the flux control characteristic relationship of valve.In experimental investigation, we specially design a test-bed to study characteristic of the new control butterfly valve, and get the experimental flux control characteristic relationship between relative flux coefficient and relative valve opening.By contrasting the results of numerical and experimental investigations, we can find that: the method of CFD technology used in investigation on valve plate model is entirely feasible, and the new control butterfly valve has a good linear flux characteristic. The relationship between flow projection weighted area and flux coefficient plays a guiding role in new model design and experimental investigation.The results of this study are of great value in projects application.