The control valve is also called the controlling valve, in the field of industrial automation Process Control, the final control element of the process parameters, such as flow rate, pressure, temperature, liquid level and so on, is composed of the actuator and the valve by receiving the control signal of the output of the control unit and the power operation.
Points to note when installing:
Installation position, height, import and export direction must meet the design requirements, the chain should be strong and tight.
All kinds of manual valves installed on the insulated pipe, the handle should not be downward Before the valve installation must carry on the appearance inspection, the valve nameplate should conform to the current national standard "general valve standard" GB12220 stipulation. For the work pressure is greater than 1.0MPA and in the main pipe to cut off the role of the valve, the installation should be carried out before the strength and tightness test, qualified to use the rear. Strength test, the test pressure of 1.5 times times the nominal pressure, duration of not less than 5min, valve housing, fillers should be no leakage for qualified.
In the tightness test, the test pressure is 1.1 times times of the nominal pressure, the test pressure should meet the GB 50243 standard in the test, and the valve seal face without leakage is qualified. Self-operated pressure regulating valve because there is no need for other foreign sources such as power supply, gas source, only by the medium of its own energy to drive, both energy saving and environmental protection, easy to use, installation after the setting of a good pressure can be put into the automatic operation, so the control accuracy requirements are not high, but also lack of power supply, gas source of the occasion, has been more widely used. However, in the use of the process, we must pay attention to the particularity of the selection, otherwise easy to cause accidents.
In the use of the process, we should pay attention to the use of selection and installation environment, therefore, it is very important to understand the working principle and structure of the self-operated pressure regulating valve.
However, the control valve in the use of the process should also pay attention to some things:
This valve should be stored in a dry room, the access ends must be blocked, no stacking storage
Long-term storage control valve should be regularly inspected, remove dirt, in each part of the movement and processing surface should be coated with antirust oil to prevent rust This valve should be installed on the horizontal pipe and must be installed vertically.
The media must be installed as indicated by the icon arrow In the automatic control of the modern factory, the control valve plays a very important role, the production of these plants depends on the proper distribution and control of the flowing liquid and gas, which require some final control elements to be completed, whether energy exchange, pressure reduction or simple container feeding.