Regulating valve in the role of process control is to accept or adjust the computer's control signal, changing the flow of medium was transferred to be transferred within the required parameters to maintain the framework of the production process so as to achieve the automation. If the automatic adjustment system and the manual adjustment process, compared to detection unit is the eyes, and adjust the control unit is the brain, then the unit is the person's hands and feet, regulating valve is the people's hands and feet. Process to achieve a certain parameters such as temperature, pressure, flow, level of regulation, such as control, are inseparable from the control valve. Therefore the correct choice of control valve automation in the process of great significance.
The composition of a control valve and classification
Also known as the control valve control valve is the main type of actuator, control unit through the acceptance of adjustment of the control signal output, with power to change the fluid flow operation. Regulating valve is usually composed of the implementing agencies and valves. If the use of its executive body with the power to regulate the valve can be divided into pneumatic, electric, hydraulic three, that is the source of compressed air as a driving force of the pneumatic valve to electrical power source for electric control valve to liquid medium (such as oil) pressure-driven dynamic electro-hydraulic control valve, while, according to their functions and characteristics of sub-, and solenoid valve, electronic, smart, on-site, such as bus-type regulating valve. Control valve are many types of products, a variety of structure, but also constantly updated and changes. Generally speaking valve is common, both implementing agencies and pneumatic matching can also be the executing agency and the electrical or other executive body to match.
2 Select the type of control valve
2.1 Control Valve Valve Valve type control valve of choice is to choose the most important aspects. Many different types of control valve body, are commonly used straight-through single-seater, two-seater straight, angular, diaphragm, small traffic, links, eccentric rotation, butterfly, sleeve, spherical, such as 10. Prior to the selection of valves, to control the course of the medium, the process conditions and parameters of careful analysis, to collect sufficient data to understand the system requirements on the control valve, according to the data collected to be used to determine the type of valve. Specific options, available from the following considerations:
(1) spool shape chosen primarily on the basis of the structure of the flow characteristics and to consider factors such as unbalanced force.
(2) abrasion-resistant when the fluid medium containing high concentrations of wear particles of suspension, the valve core, valve seat joints will be shut down every time a serious friction. Thus the valve flow path to smooth, the internal valve to a hard material.
(3) as a result of corrosion-resistant medium is corrosive, can satisfy the regulatory function in the circumstances, the valve structure is simple as we choose.
(4) medium temperature and pressure when the medium temperature, pressure and changes in the high when the valve core and valve seat should be used by the material temperature, pressure changes in the small valve.
(5) to prevent the flash and the flash cavitation and cavitation generated in the liquid medium only. In the actual production process, the flash and the air flow of not only affect the calculation of coefficients, but also the formation of vibration and noise, so that shorter service life of valves, the valve should be in the selection of flash and have a valve to prevent cavitation .
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
No comments:
Post a Comment