Walchem Corp., of Holliston, Mass., launches its LK Series of mechanically actuated diaphragm (MAD) metering pumps. The motor-driven pumps have a maximum capacity of 114 gallons per hour and a maximum pressure of 150 psi. They are designed to pump a wide variety of chemicals used in industrial and municipal water, waste-water treatment and agriculture, among other applications. The worm gear, tapered roller bearing, and oil bath lubrication provide outstanding durability and wear resistance.