| FlowCon AB | FlowCon K | FlowCon SH | ISOLATOR "R" | AHU Wafer | Uni-Flange | CL 150/300 Wafer | Cartridge | FlowCon SM |

At the heart of every automatic flow control valve is the cartridge whose design, materials and manufacturing tolerances critically affect valve performance. Four Types of Cartridges Some of companies offer you only one type of cartridge, in various sizes, for all their valves because all their valves are non-adjustable single flow. If you want to change the flow, you have to replace the cartridge. FlowCon offers you single and multi-flow valves. We have a total of 4 types of adjustable and non-adjustable cartridges, allowing you tremendous flexibility in applications. The description of each cartridge follows. 1. The Standard Flow Cartridge 2. The Hi-Flow Cartridge 3. Internally Adjustable Cartridge 4. Externally Adjustable Cartridge Smooth Flow Curves without Bumps, Dips and Gaps Figure 8. THE GRISWOLD FLOW CURVE Figure 9. UNACCEPTABLE FLOW CURVE - BUMPS & DIPS Figure 10. UNACCEPTABLE FLOW CURVE - GAPS All FlowCon cartridges are designed and manufactured to give a continuous and smooth flow curve across their entire nominal control range, as shown in Figure 8. We have also studied the published flow rate calibration tests of other cartridges on the market and have found many unacceptable because they have bumps, dips, and gaps, as shown in Figures 9 &10. The bump represents a sudden increase in flow for a small change in the differential pressure and the dip represents a sudden decrease. The large amounts of energy released by these sudden surges, for flows above 189.25 L/min, can cause pipe anchors to come off the wall! In our experiments, we've seen anchored test stands lift right off the concrete floor. Such surges, even within the plus/minus 5% flow accuracy, are highly unacceptable. The gap represents loss of flow control across the corresponding pressure differential range. The valve's performance will keep jumping from one side of the gap to the other, causing pipe noise and severe vibrations. It is very important that the cartridge flow curve be smooth without bumps, dips or gaps.