A single ball check valve enables the H-Flo packed-plunger, positive-displacement metering pumps to provide heavy-duty, virtually maintenance-free metering of chemicals and solutions. The pumps are available in both simplex and duplex models, with capacities ranging from 20 to 682 gal/h at pressures up to 7,200 psi with an accuracy of ±0.5% at steady state. Pump capacity is adjustable from 0 to 100% by varying the piston stroke length while the pump is stopped. Duplex pumps are normally 180-deg. out of phase, but can be synchronized so that two fluids can be pumped simultaneously.

Its compact, vertical, close-coupled design allows this pump to easily fit into confined areas, where it can be flange-mounted to closed tanks or affixed to mounting beams above open tanks. The pump has a flow range of 20–350 gal/min and pressure capability to 150 psi, and is compatible with vessels up to 20 ft deep. Mechanical seal replacement is simple and can be done without removing the pump from the sump or its mount. The pump can handle high-viscosity, high-solids-content materials, as well as abrasive fluids.

Optos Series metering pumps employ a positive-displacement, reciprocating piston assembly to provide precise metering at high pressures (up to 6,000 psi). The piston is driven by a high-resolution stepper motor using advanced sine-wave-adjustment speed algorithms to maximize flow output and minimize pulsations. Three models are available for flows of 0.002–20 mL/min, 0.003–40 mL, and 0.01–80 mL/min. The materials in the liquid end are chosen based on corrosion resistance; the piston is sapphire, and the inlet and outlet valves incorporate sapphire seats and ruby balls.

The 2- and 3-in. ported metallic models in the ARO Pro Series of diaphragm pumps are now available in additional materials of construction. Previously offered only in aluminum, the Pro Series now includes cast iron and stainless steel models. Like their aluminum counterparts, the new models feature patented air-valve technology that eliminates pump stalling by utilizing an unbalanced design — by creating an optimal pressure differential, air valves do not center, even under low air inlet pressures.

For pumping radioactive chemicals where a beta or gamma shield must be present, the KDS 310 Nano Pump syringe pump features a remote pumping unit and control box that can be located up to 6 ft away, thereby protecting the operator. The pump is used exclusively with micro-syringes in sizes from 0.5 to 250 µL. Small size, remote control and a rugged mounting arm make it suitable for use with micromanipulators, stereotaxic frames and other clamping devices. When used on a stereotaxic frame, direct injection can be performed, thus reducing the volume of sample required.

Tacmina PZ Series electronic metering pumps operate at a capacity that can range from 1 to 1,300 mL/min, and at pressures up to 220 psi. They are available in manual control, external input and programmable models. The pumps are suitable for applications that require accurate, reliable injection of liquid chemicals, nutrients or disinfectants. They will operate on any single-phase voltage, from 94 VAC to 264 VAC, and their patented design leaves flowrates and accuracy unaffected by voltage fluctuations.

Suitable for handling a broad range of fluid viscosities, the Industrial Variable Speed Pump (IVSP) features a high-torque, 3-phase variable-speed drive, an integrally mounted valveless pump head, a space-saving, DIN-designed controller, and a 3-digit LED display control module. Motor speed can be adjusted either manually via the front-panel membrane switches, or electronically using 0–20-mA, 4–20-mA or 0–10-VDC input signals. Additional control functions include start, stop, acceleration, forward and reverse.

E7 aluminum diaphragm pumps have a port size of 0.75 in. and feature a leakfree, bolted construction. Their shoe-valve design prevents blow-by when the pump is online but not in use. They employ the manufacturer’s Elima-Matic air-valve system, which ensures non-stalling, non-icing, lube-free operation. For use in lubrication, adhesive dispensing, OEM systems and many industrial applications, the E7 pumps are available with either metallic or non-metallic air sections.

Cardinal transformer-oil pumps are rated for continuous-duty operation at temperatures from –40°F to 212°F. They allow thermo-siphon flow when the pump is not operating, which permits natural convection even when the pump is completely shut off. Along with a rugged split-casing design, the use of heavy-duty class 30 cast iron for the pump casing, motor enclosures, impellers and volutes extends the life of the pump. Large thrust-face sleeve bearings minimize wear and reduce maintenance.

The Model VRS vertical rubber-lined sump pump handles tough slurries in chemical processing, power, and pulp and paper applications. The VRS liners, impeller and casing halves are interchangeable with those of the manufacturer’s SRL horizontal pumps, reducing parts inventory and maintenance costs. Changing the field-replaceable elastomer liners does not require a change of the entire pump casing. The pump’s impellers are built with tighter tolerances than other vertical sump pumps, improving operating efficiency and saving up to 40% in energy costs.