2-7
2-3. Air supply
Clean and dry supply air ensures long-term stability of the SVP. A typical air supply system is
shown below:
To actuator
Air output connection
1/4NPT thread
Auto/Manual Switch
Regulator valve
with lter Shuto valve
Air supply
Fig. 2-6.
Air supply must be clean; it should not contain foreign substances (moisture, oil, or dust).
The air must be dry, with a dew point at least 10°C lower than the SVP’s lowest site operating
temperature. For example, if the lowest environmental temperature the SVP is exposed to is
0°C, then supply air should not condense at temperatures under -10°C.
A shutoff valve, an air regulator (if not provided with your SVP) and a 3μm or better filter
must be installed between the air supply and the SVP as close as possible to the SVP unit. The
shutoff valve enables disconnection of the SVP from the control valve for ease of maintenance.
Recommended piping practices:
Air supply pipes should have an inside diameter of 6mm (10mm outside diameter tubing
recommended).
Pipes should match the installation environment, i.e. for a corrosive environment, use
vinyl-clad copper pipes.
Use joints that precisely fit the pipes.
Sealing tape is preferable to solid or liquid sealants for pipe joints to SVP air connections.
Prevent sealing tape/sealant from entering pipes.
Use the right length of piping; avoid excess lengths.
Completely flash pipes before use, checking for burrs and other problems.
Check for leaks after installation.
To Next Page
Loading...
Need help?
General
