Is the valve flow characteristic determined by the actuator or the valve body?
Valve (valve) is a control component in the fluid delivery system. It has the functions of closing, adjusting, guiding, preventing reverse flow, stabilizing voltage, shunting or overflow and releasing pressure.Valves used in fluid control systems, from the simplest stop valve to a very complex automatic control system used in a variety of valves, a wide range of varieties and specifications. Valves can be used to control air, water, steam, a variety of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. The valve according to the material is divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316), chrome molybdenum steel, chromium molybdenum vanadium steel valves, valve, dual phase steel valves, plastic valves, non-standard customized valve material etc..
Valve flow characteristics are the characteristics of the flow rate of the flow through the valve when the fluid is set at a constant pressure through the valve closed to the full opening. Therefore, the spool form is determined, and the actuator is a driving device for them in any form it is driven by the valve fully closed to fully open position change.
The spool in different forms directly determine the flow characteristics of the valves, stop valves, the flow characteristics are linear, equal percentage, quick opening, these features is actually the spool taper are different, in the same position, the valve core and valve sealing surface of the space size is different, so the fluid the flow through different. For example, a valve spool for cover type, which has a conical convex surface is very short, when it is opened, the valve core and valve sealing surface of the space will be increased, with the spool continue to be open, it will increase the amount of space, makes the fluid flow increased quickly, which is characteristic of fast open. The same spool is a tapered body longer valve, and in its opening process, the valve core and valve sealing surface changes in space increased slowly, the corresponding flow change is also slow. According to the angle of the spool, the flow characteristics of the valve may be linear or equal percentage, which is different from the quick opening of a characteristic thinning.
