V-shaped ball pneumatic valve type selection

v-shaped ball pneumatic valve is the most important unit in fluid handling system, undertake the task of the regulating system of fluid flow, v-shaped ball pneumatic valve often act as a terminal control element, is the most important part of any pipeline system. Leave the appropriate size of the v-shaped ball pneumatic valve, the operation of the system cannot efficiently. V-shaped ball pneumatic valve size is too large, as a result of lower system regulation performance; Size is too small, the fluid through the control of pneumatic valve will lead to a larger pressure loss to maintain enough flow, and often can't meet the flow requirements. Master the fluid mechanics and pipeline system composed of common sense, is advantageous to the v-shaped ball of pneumatic valve, the correct selection.
in order to choose the right size, v-shaped ball used in V pneumatic valve, need to know the following parameters:, for V type ball a general description of the pneumatic valve application; , type of medium;
, inlet pressure, Absolute pressure;
and temperature; (
and the velocity Maximum velocity, velocity of normal and minimum velocity;
, outlet pressure ( Absolute pressure ( Minimum, normal and maximum;
, pipe size;
, the proportion of medium coefficient;
and critical pressure medium; Note: v-type ball pneumatic valve size is not a fixed value, need to choose according to optimal flow performance.
according to the above parameters, complete the following steps to correct selection of v-shaped ball pneumatic valve size:
, select the appropriate Cv value calculation formula of calculating Cv;
, according to the FL and Xt value judgment whether there is a cavitation phenomenon;
, according to the calculation for the Cv value of check Cv value table, select the appropriate pneumatic valve and the Angle of v-shaped mouth; ( V-shaped ball pneumatic valve: to ensure that the calculated minimum Cv value and maximum Cv in v-shaped ball pneumatic valve between % and % opening.
and select pneumatic valve connection mode ( Flanged, threaded, or welding and material;
, select actuator type: electric actuators or pneumatic actuators.
note: v-type ball pneumatic valve v-shaped mouth opening direction, the choice of small open degree of precision adjustment, v-shaped mouth Angle forward; The large opening and high precision adjustment, v-shaped mouth arc facing before; V-shaped port is located in medium high voltage direction.