2 types of rotary valve 2.1 classification in accordance with the type of rotary valve in accordance with the type of categorization of three types: butterfly valve, ball valve and valve plunger. Butterfly baffle or blade through the shaft as the center to rotate a certain angle to control the direction of flow. Baffle or blade looks a bit like a butterfly. Butterfly valves can be cut or regulation applicable to a solid paste or fluid suspensions. Ball valve with the valve core is the hole shape of the ball, when the valve is in open position to allow fluid flow when the ball off a 90-degree rotation physical logistics. Ball valve can be cut off from the role and regulation, and its small pressure drop for viscous and corrosive fluids, low temperature fluid slurry. Ball valve can also be used in high temperature, high pressure fluid. The spool valve plunger in the middle with tapered or cylindrical hole of the plunger, when the plunger hole and when the fluid flow direction can be, when the plunger to rotate 90 degrees in any direction when the flow was cut off the road. Plunger valve is usually used for on / off control. 2.2 classification in accordance with the rotary valve operation mode of operation in accordance with the classification of the following types: manual valves, automatic valves and control valve. Rotary Valve manually operated by hand, by manually executing agencies, such as hand-rod, gear, hand wheel and so on to carry out a switching operation, including a 90-degree rotation of the parts. Implementing agencies through the operation of the valve and flow control components to open valves and valve clearance. Automatic rotary valve, including the implementation of an automatic to make use of external energy to automatic control or remote control switch valve. Should use the following general automatic valve: The valve (eg, greater than 8 "valves), manual operation of the valve is very difficult, in a toxic or other adverse environment can not be manually operated valves, for to deal with emergency situations must be rapidly closed valve valve; bulk formula with all the valves and other flow path. self-executing agencies, including the type of hydraulic, pneumatic and electrical and so on, the majority of automatic rotary valve can be the executing agency for electrical and pneumatic to operate. rotary valve to the opening in a particular operation, this type of valve, including the size of an electrical signal generated in accordance with the corresponding corner of the implementing agencies. butterfly valves are commonly used in low-voltage large-diameter, and leakage control requirements less stringent in . rotary control valve is a control valve, control valve also includes a number of straight travel valve, such as cut-off valve, gate valve, valve. automatic shut-off valve is not controlled rotary valve, because it can only be limited to the OFF position.
3 Application of the trend of rotary valve (1) the automatic valve in place of manual valves for industrial applications has become a trend
With the worldwide industrial automation and process improvement and adjustment of automatic rotary valve increasing demand, while reduced demand for manual valves. Valve so that the future application of this technology development should focus on the point of the valve actuator and the locator so that the valve can be connected to the personal computer, PLC, DCS system. Such as by increasing the number of locator control valve to increase the accuracy of the control valve performance, the success of the application if the digital locator ND800 for rotary control valves, process parameters will be able to make the scope of the variable increased by 50%, and then with control valves, valve positioner of the characteristics of the electronic properties of the match to further enhance the control performance. Typical applications are the use of HART Network Field Browser software.
Compared with the shut-off valves, control valves, is more applicable to a continuous production process. By regulating the function, control valve to the input parameters to change according to the size of the flow in order to maintain the same settings. In many cases, cut off both valves and control valves are required, such as oil refineries, the 1 / 4 rotation to be used as safety shut-off valve shut-off valve. A control valve and the two shut-off valves are usually used together, when the demolition of control valves to isolate and cut off when the play the role of logistics.
Electric implementing agencies will gradually replace the pneumatic executing agencies, as implementing agencies do not require electrical installation and maintenance for the pipeline and compressor, and the locator can be more closely linked, and can be avoided will be converted to gas signal signal.
Rotary Valve is the other direction of development by improving the design of the valve seat and valve seat material to improve valve performance, reduce leakage, such as the outer valve. The role of control and positioning of the smart valves, as manufacturers reduce costs and increase productivity enterprises demand the market is becoming increasingly widespread. (2) to replace the trend of straight trip valve
Rotary valves because in many cases can replace the straight trip valve (eg valve), with straight trip valve (eg valve), the rotary valve has many advantages (see Part 1 of this article). Especially with the action to clean up the air (CAA) the implementation of the amendment to prevent external leakage of valve is becoming increasingly important. 1990 amendments to the CAA, including the 189 kinds of volatile toxic air pollution sources (VHAPs), which is 150 kinds of volatile organic compounds (VOCs). April 1997 through the latest amendments to the CAA, in addition to including the former version of the amendment of the leak detection and repair (LDAR) program, also includes quality improvement program.
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