In many industrial applications, for a small amount of material under the atmospheric pressure or under very high pressure difference larger volume of material require precise control. Then calculate the Cv value is small. It can use the minimal production in the middle of the experimental device or used in add a small amount of reagent to the large number of process liquid industrial equipment. The theory of minimum Cv value is 0. 00001, included the Cv of small flow rate than equal to the normal valve size from 1 inch to contained 16 inches. When considering the use of these small flow valve, choose the criterion and the normal control valve. For example, and the control valve concatenated friction loss is small, and no adverse characteristics of pump head. Don't require such as percentage of the real property. The design of the main problems are required to carefully study the actual flow range. The smaller the Cv value become more become the theoretical value. Them as the flow capacity indicators are useful, but the accuracy and repeatability is questionable, because in many cases, because may be laminar flow through the throttle part, may also is a mixture of laminar flow and turbulent flow, the mixed flow or flow conditions and change along with the change of the valve stroke. From the design point of view, it is necessary to fluid throttling does actual size is small; But the application of many small flow problems involving high pressure difference and accompanied by wear, it will bring more problems. In the design of standard valve, the flow capacity is mainly determined by the diameter of the valve seat hole. When the flow capacity, the actual minimum diameter of 1/16 of an inch. In this way, hole Cv value approximation of 0. 06 or close to the small flow range limit. Mainly used to reduce stroke or restricted access point opening valve core method to further reduce it. Short stroke actuator is very suitable for the balance of throttling effect, the use of pneumatic actuators to drive arm, turning slightly by the threaded valve stem, Industrial Valves core in this system USES two different threads of the screw torque to further restrictions on the itinerary, use this method to limit the travel to less than 0. 005 inches. When the linkage variable, stroke than more than 10, the valve core range is 0. 188 inches, for actuator rated stroke is three-fourth inches (3/4 '), the schedule can be reduced to a quarter. In this way can make the trip to the minimum value of 0. 010 inches. This allows the field on a wide range of adjusting flow capacity, but also for the operation of the high pressure differential operation with high strength. Both special Industrial Valves using a simple cone valve core. For minimal flow, the use of a delicate cone pin, and adjust in the taper hole. For the use of a few strict situation, can use conical needle or with a milling 樔 plunger adjustment in the hole, aperture range from 1/8 'to 1/4', this type of valve is about 1/2 inch. This small flow trims applications can be installed in the factory in the common ball valve body, but can significantly reduce the size of the body and actuator. Light weight, compact structure, the Industrial Valves is suitable for the experiment device operation. Small size, small flow trims the Cv value of significance is not big. Fortunately, in the valve seat hole large flow range effectively. Besides adjustable valve stroke, trims is easy to replace, and, if use many of valves, repair a few trims cost is not high also, because the body of the same, are interchangeable. With conventional formula to calculate the Cv value requirements, and then for a particular valve used to choose close to the maximum size of trims. If these trims in actual operation is too small, can be used to simply increase the valve stroke or slightly modified valve core methods to improve the flow capacity. In this paper, the keyword search: electric control valve to supply information
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