Control Valve Selection guide
Control valve selection is complex, the following ideas to provide a simplified selection.
1) the choice of valve type
Valve Valve the best choice for a full-featured, light weight, full-featured ultra-light control valve as a substitute for other control valve products, simplifies the use of futures products due to worry about the selection function is not complete properly (such as direct journey aiming to halt the issue of class Valve ; cut off the relationship between pressure, etc.) of trouble.
2) the choice of implementing agencies
The choice of implementing agencies: ① selection of imports of electronic enforcement agency to overcome the issue of a series of unreliable; ② fine selection of thin-film mini-series of the implementing agencies; ③ piston implementing agencies should consider the type of gear; ④ told the pressure valve closed by the plant the size of the selected implementing agency.
3) The choice of materials
This problem is more complicated. Due to a number of corrosive media on the corrosion of PTFE does not exist, it should use an all-PTFE corrosion-resistant valve, so that selection of corrosion-resistant occasions been greatly simplified, only when the temperature> 180 ℃, <-40 ℃, PN ≥ 2.5KPa hours, and then branch to consider corrosion resistant alloy.
4) The spring range of options
The executing agency of the valve with thin film is most occasions, are equipped with locator, you can take full advantage of 250KPa gas source, use a medium stiffness, but also take into account a larger output force of the spring 60 ~ 180KPa; Similarly, on the piston implementing agencies use 150 ~ 300KPa.
5) The flow characteristics of the choice of
① When the parameters are not allowed to get when you are selecting the number of features: ② When adjusted to respond faster when the system, such as traffic regulation, fluid pressure regulator, the Commission on the number of properties; when the system slow to respond when the liquid level system, temperature control system, select a straight line features; ③ S value is small, the election of the number of properties; ④ valve may be a small opening work, selecting the right number of features.
The choice of flow
Direct single-sealed class stroke adjustment valve, is usually selected to open stream type; When asked to cut and anti-erosion, the election flow closed type (closed-type flow stability is poor, should take into account the stability of the corresponding measures).
The choice of filler
When the band locator, try to use wear-resistant, heat, long life and reliable sealing of graphite filler.
Locator with the choice of converter
Converter is not targeted to improve the output power, increased movement speed, improve the positional accuracy of the three major roles, it should normally be selected locator (locator devices and conversion prices are pretty).