Originally Published MPMN November 2001
Spotlight on Pumps and Valves
Teflon diaphragm valves
Pneumatically operated Teflon diaphragm valves have 0.25- to 2-in. spigot connections for high-purity applications. The BSD-series units have no metals or elastomers in contact with process liquid, and weigh as little as 5 oz. The valves permit up to 100-psi inlet pressures and up to 25-psi back pressures. Plast-O-Matic Valves Inc., 1384 Pompton Ave., Ste. B, Cedar Grove, NJ 07009.
Computer-controlled peristaltic pump
A peristaltic pump maintains sterility in handling advanced live-cell pharmaceutical and biotechnological products that cannot survive valve transition or contact with stainless steel. The PD121 pump head uses a spring-loaded tube bridge that gently handles shear-sensitive products such as blood, tissue, or live cultures. The pump allows the filling of fluid products with volumes that range from 100 µl to 5 L with a ±0.5% accuracy. Flexicon Liquid Filling Inc., 115 Rte. 46 W., Ste. F1000, Mountain Lakes, NJ 07046.
A company offers one-way back-check valves with barbed and straight fittings in a variety of sizes. Valves open at less than 2.5 in. of water and are tested to ensure that backflow does not occur even at very low back pressure. They are constructed of medical-grade acrylic and silicone. Miniature valves with male and female luer ends are also offered. Resenex Corp., 9614-F Cozycroft Ave., Chatsworth, CA 91311.
A valve features a retracting spool design that snaps off the flow of silicone at the needle or nozzle to ensure that accurate deposits are dispensed without stringing or waste. The 790HPNM can be integrated into an automatic dispensing robot or used as a benchtop dispensing system. I & J Fisnar Inc., 2-07 Banta Pl., Fair Lawn, NJ 07410.
Miniature diaphragm pump
A miniature diaphragm pump offers free flows up to 35 L/min with a peak pressure of 20 psi. The T2-01 pump offers 12-30-W power consumption over the operating range. Optional multihead configurations are available to achieve free-flow rates in excess of 120 L/min. Several motor, size, performance, and cost options are available to meet application specifications. The pump measures 5.25 x 2.75 x 3.875 in., and weighs less than 2 lb. It is suitable for portable air and gas applications where dc operation, low power consumption, minimal weight, and compact size are critical. The use of engineered thermoplastics provides light weight and corrosion resistance. T Squared Pumps, 1-E Frassetto Way, Lincoln Park, NJ 07035.
Latching solenoid valve
A subminiature latching solenoid valve is designed for applications that require ultralow power, low heat, and small size, such as battery-powered pneumatic instruments. The valve is magnetically latched and requires 10-millisecond pulses of current to switch its state. It consumes 2.8 mW·s per switch and offers bistable performance. Available in flexible plug-in, ported, and face-mount configurations, the valve measures 1.12 in. long x 0.28 in. diam. The Lee Co., 2 Pettipaug Rd., P.O. Box 424, Westbrook, CT 06498.
Industrial diaphragm pumps
A line of hydraulically balanced industrial diaphragm pumps can be close-coupled to 5/8 NEMA or metric motors, as well as belt-driven. The M-03-series pumps are self-priming, can run dry without damage, and are suitable for pumping clean fluids, nonlubricating fluids, abrasive solutions, caustics, corrosives, high-temperature fluids, and other liquids. Wanner Engineering Inc., 1204 Chestnut Ave., Minneapolis, MN 55403.
Type 343 ball valve
A Type 343 ball valve features a three-way true union design in PVC with sizes ranging from 2½ to 6 in. Available with socket, threaded, and metric fusion end connections, the valve offers an integrated universal mounting system. The three-way diverter ball provides interconnection of two inlets with an outlet for mixing, or interconnection of outlets for proportional diverter operation. George Fischer Inc., 2882 Dow Ave., Tustin, CA 92780.
Digital fluid motion system
A digital fluid motion system offers fluid metering, start-and-stop dispensing, and continuous low-pulsating delivery. The Travcyl delivers a ±0.1% absolute accuracy, symmetric performance in both directions, and no leakage at up to 100-psi pressure differential. With inert wetted parts, no valves, and clean-in-place capabilities, the system is suitable for medical, pharmaceutical, and biotech applications. Encynova International Inc., 557 C Burbank St., Broomfield, CO 80020.
Custom manifold systems
A company provides custom manifold systems that eliminate the need for tubing between valves, minimize internal flow volumes, reduce labor costs, and improve reliability. Available materials include aluminum, PEEK, polycarbonate, and polyethylene. Other materials are provided for specific toxicity, chemical resistance, and temperature requirements. South Bend Controls Inc., 1237 Northside Blvd., South Bend, IN 46615.
Low-cracking-pressure check valve
A miniature low-cracking-pressure check valve permits free flow in one direction and checked flow in the opposite direction. It operates reliably at less than 0.5 psi and is offered in a variety of combinations of 10-32 UNF external and internal threads. A captured O-ring gland ensures leaktight operation. Beswick Engineering Company, Inc., 284 Ocean Rd., Greenland, NH 03840.
A series of gear pumps offers 0.5-gpm maximum flow rates, 200-psi maximum pressure, and 180°F maximum fluidic temperature capabilities. Three different sizes of PPS polymer gears are available on the 1000-series pumps, depending on flow rate and pressure requirements. Motors are thermally protected and reversible, and can run on either 12 or 24 V dc. Applications include metering, dispensing, or transferal of fluids. Gorman-Rupp Industries, 180 Hines Ave., Bellville, OH 44813.
High-flow check valves
A high-flow check valve has a disk with a short stroke as its only moving part. The disk-type check valve is available in 1/8-, 1/4-, and 3/8-in. sizes. It can be made of brass or stainless steel, and is suitable for use with liquids or gases. Fixed flow control allows free flow to occur in one direction and metered flow to occur in the opposite direction. O'Keefe Controls Co., 4 Maple Dr., Monroe, CT 06468.
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