Cleveland, OH—When Tim Gale, the engineering manager at chemical processor State Chemical, thought about replacing his plant's positive displacement valves in chemical mixing operations, it didn't take much prompting to get him to upgrade the valves. "Our old valves leaked and had become so inaccurate that they could no longer be calibrated," says Gale.
Compounding his reasons for valve upgrading was State Chemical's desire to obtain ISO 9000 status. Processes are subject to the same inspection and test requirements as products under ISO standards, so he had to plan, define, and implement inspection, measuring, and monitoring activities that improved the processes.
Gales explains that State Chemical employees would manually measure the liquid levels in mixing tanks. "We were losing a lot of fluid, so we had to add more than was really necessary," he says.
State Chemical replaced its positive displacement valves and batch control systems with Type 8035 inline flow transmitters that have digital displays and Type 2000 Y-pattern valves from Burkert (Irvine, CA). "We chose the Burkert 8035 mainly because it was digital and easy to calibrate," says Gale. Four wall-mounted transmitter valves combinations and several remote transmitters are used for solvent and process water dispensing.
Type 8035 displays both flow rate and volume on a large LCD digital readout. Test simulation functions allow setup without operating the system, a feature that is important to State Chemical's ability to meet ISO 9000 requirements, as is automatic control of bulk and mixed chemical transfers.
In addition to helping the plant gain its ISO 9000 status, Gale estimates the new system saves material by reducing the plant's overfill rate from more than 5% to less than 1% in the plant's stainless steel tanks with volumes up to 3,700 gallons.
For more information about valves from Burkert: Enter 533