CDI CONTROL DEVICES

What is the difference between safety valves and relief valves?

Safety valves are spring-loaded and open fully at a set pressure to release excess pressure, making them ideal for systems where overpressure could be caused by a process malfunction or human error. On the other hand, relief valves open gradually and relieve pressure over a range of pressures instead of at a single set pressure. They typically use a spring-loaded or pilot-operated mechanism and are often used in systems where overpressure could be caused by thermal expansion or other slow pressure changes.

How do I choose the right float balls for my needs?

• Determine the specific application, including fluid type, temperature and pressure requirements.
• Choose the appropriate material for the float ball, such as plastics, stainless steel or brass, based on the application requirements.
• Ensure that the size and weight of the float ball match the buoyancy requirements and installation space.
• Consider any additional features, such as coatings, threads and connections, that may be necessary for your specific application.

How do I set my LGM, P25, or P25V valves to my desired pressure settings?

• Loosen the range screw jam nut
• Turn the range screw clockwise to increase the levels or counterclockwise to decrease them.
• Start the compressor and note the cut-out and cut-in pressures.
• Adjust the pressures using the range screw as needed.
• Tighten the range screw jam nut once the desired pressure levels are set.
• If a differential adjustment is necessary, adjust the cut-in pressure to the desired level using the same steps as before.
• Loosen the differential screw jam nut and turn the differential screw clockwise to raise the cut-out pressure or counterclockwise to decrease it.
• Tighten the differential screw jam nut once the desired cut-out pressure is set.
• This adjustment should not affect the cut-in pressure set in Step 4, so the adjustment is now complete.