Control Valve – The Versatile Control Element-www.jhyc.cn

Business Control valves are the valves used to control pressure, volume, liquid level and flow direction in a fluid transmission system. The device is capable of moulding flow at different degrees ranging from a minimum flow to the full capacity in response to a signal from an external control device. Being the most critical part of any control loop, the control valve is also known as "the final control element". Usually, the most important part in hydraulic machinery is directional control valves. It has the ability to restrict and permit the actual flow. There are two types of directional control valves- hydraulic and pneumatic. While hydraulic directional control valve focuses on liquid working flow, pneumatic directional control valve is meant to control gaseous working fluid. Most of the industries purchase the control valves on the basis of few static specifications like pressure ratings, flow capacity and fluid type. There are certain dynamic characteristics of a control valve which need to be kept in mind before making the final purchase decision. A right kind of choice will always be helpful to mitigate process-control-related problems. Some of the characteristics include: process-side error, stroking speed, positioning resolution, overshoot, installed gain, friction, dead band, and hysteresis and load sensitivity. Control valves have few .mon features such as self-lubricating, chemical resistance and wear resistance. The quality of a good control valve can be judged through its temperature and pressure level that ranges from 60 degree F to + 400 degree F. The ability of control valves depend on lot of factors. If the quality of control valves is good then it is highly useful to reduce process variability. It is very important that valve assembly should be optimized or fully developed as a unit. When the .ponents of valve are designed as a .plete assembly it yields the best dynamic performance. There are three important areas of design considerations such as valve response time, dead band and actuator/positioned design. The efficiency of control valve can directly affect the profits of process plant. Control valve is the most crucial part that can create change in the process variable. It is very important to see that control valve is working in an accurate manner. The device can lead to excellent results if it is operated in a proper way. An .anisation cannot achieve high level of success without focussing on good valve management. It may adversely affect the industry’s quality production, profits and energy. There are several ways to optimise the valve efficiency. The factors that can determine the optimum use of control valve depends on proper storage and protection of valve. It also depends on correct control valve selection for the application. There should be proper installation techniques and an effective predictive maintenance programme. The basic types of control valves are ball valve, ceramic disc valve, butterfly valve, duplex ball valve, check valve, diaphragm valve, gate valve, choke valve, 3 hastelloy check valves, needle valve, globe valve, knife valve, piston valve, pinch valve, sampling valves, pressure relief valves, thermal expansion valve, spool valve, poppet valve and plug valve. About the Author: 相关的主题文章:

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