1. The temperature of the medium used by the electric fluorine-lined valve
Electric fluorine-lined valve, the fluoroplastic used is F46 (FEP), and the temperature of the medium used cannot exceed 150°C (the temperature of the medium can reach 150°C in a short time, and the temperature should be controlled within 120°C for a long time). Otherwise, the valve's The F46 lining of various parts is easy to soften and deform, causing the valve to close undeadly and large leakage.
If the temperature of the medium used is below 180℃ for a short time, and below 150℃ for a long time, another fluoroplastic—PFA can be used. However, the price of PFA lining is more expensive than that of F46.
2. Don't have negative pressure
Electric fluorine-lined valves should avoid using negative pressure in the pipeline. If there is negative pressure, the fluorine-lined layer in the valve cavity is easily sucked out (bulged), shelled, and the valve opens and closes.
3. Pressure and differential pressure control range
The pressure and pressure difference should be controlled within the allowable range. Especially fluorine plastic lined regulating valve and stop valve sealed by bellows. Because the bellows is made of PTFE material, the pressure and pressure difference are large, and it is easy to cause the bellows to rupture the rubber-lined valve. The fluorine plastic lined control valve with bellows seal can be changed to PTFE packing seal if the pressure and pressure difference are large under the conditions of use.
4. Applicable medium
The medium conditions used in electric fluorine-lined valves should not contain hard particles, crystals, impurities, etc., so as to avoid the valve core, the fluorine plastic layer of the valve seat or the PTFE bellows from being worn out during the opening and closing of the valve. For the medium with hard particles, crystals and impurities, the valve core and valve seat can be changed to Hastelloy rubber-lined valves.
5. Valve diameter
The electric fluorine-lined regulating valve should correctly select the valve diameter according to the required flow (Cv value). When selecting, you should calculate the diameter of the valve and the opening degree of the valve according to the required flow rate (Cv value) and other technical parameters. Under the condition of operation, plus the pressure of the medium, it is easy to make the valve core and rod of the valve vibrate due to the impact of the medium. The valve core rod will even break the rubber lined valve under the impact of the medium for a long time.
When selecting various types of electric fluorine-lined valves, users should understand and master the technical conditions of use as much as possible, so that they can be selected and used well, and the service life of the valve can be improved. In the event of exceeding the scope of the technical conditions for use, it should be proposed to the manufacturer, negotiated together, and adopted corresponding countermeasures to solve the rubber-lined valve.