Adjustment valve selection precautions
Jun 27, 2019| Adjustment valve selection precautions
Control valve type selection:
(1) Determine the nominal pressure. Instead of using Pmax to set the PN, the temperature, pressure, and material conditions are used to find the corresponding PN from the table and satisfy the PN value of the selected valve.
(2) The determined valve type, the leakage amount of which meets the process requirements.
(3) For the determined valve type, the working pressure difference should be less than the allowable pressure difference of the valve. If not, the valve should be considered or selected from a special angle.
(4) The temperature of the medium is within the operating temperature range of the valve, and the ambient temperature meets the requirements.
(5) Consider the anti-blocking problem of the valve according to the unclean condition of the medium.
(6) Consider the corrosion resistance of the valve according to the chemical properties of the medium.
(7) Consider the erosion and wear resistance of the valve according to the differential pressure and the medium containing the hard material.
(8) Performance and price ratio for comprehensive economic effects. There are three issues to consider:
a. The structure is simple (the simpler and higher the reliability), the maintenance is convenient, and the spare parts have sources;
b. Service life
c. price.
(9) Preferred order.
Butterfly valve - single seat valve - double seat valve - sleeve valve - angle valve - three way valve - ball valve - eccentric rotary valve - diaphragm valve.