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Conveying System Mechanical Components Chapter 3: Installation 63 of 138
3-5 Compressed Air Connections
Making ACA Series Filter Chamber Compressed Air Connections
To provide proper filter bag cleaning, make sure that you regulate the compressed air supply
to 80 psig (551.6 kPa/ 5.52 bars). Air consumption depends on frequency and length of
cleaning air pulses into the filter bags. Higher pressures can shorten the life of filter bags;
lower pressures cause poor filter bag cleaning.
Connect a ¼” (approx. 6.3 mm) air line to the bottom of the solenoid valve air block. Make
sure that the compressed air you use is clean, dry, and free of oil. In-line filters can handle
small amounts of moisture; in-line desiccant filters or packed beds of granular absorbing
polymer can remove oil mist and condensed oil.
Making Pump Compressed Air Connections
Connect the vacuum pump to a minimum of 60 psi to 80 psi (414 kPa to 552 kPa) source of
clean, dry, lightly lubricated compressed air. Make the
1
/8” NPT (3 mm) connection at the
solenoid valve on the pump package.
Your compressed air supply piping should include:
1. A shutoff valve for ON/OFF control.
2. A pressure regulator with gauge.
3. An air filter/lubricator.
Connecting Vacuum Receivers with Atmospheric Valve Compressed Air Lines
See Figure 31 on the following page for an illustration of a typical atmospheric valve. Most
conveying systems use atmospheric valves to direct system vacuum into the vacuum hoppers.
You should be able to locate the atmospheric valve in one of three places:
• Installed on top of TF or VF Series vacuum receivers
• Installed in the vacuum header on SR Series vacuum receivers
Connect the atmospheric valve to 60 psi to 80 psi (414 kPa to 552 kPa) source of clean, dry,
lightly lubricated compressed air.
Run a
3
/8” (9 mm) branch line off the plant air main to supply the vacuum hoppers in your
system. Install a
3
/8” (9 mm) x
1
/8” (3 mm) tee in the UP position near each hopper.
Connect compressed air to the normally closed port on the atmospheric valve solenoid valve
with a
1
/8” (approx. 3 mm) pipe nipple. Connect the common port to the atmospheric valve
using
1
/4” (6 mm) poly tube and connectors.