TechArchive

Original article date: November 1999 On a Parker hydraulic tie-rod cylinder, packing and wiper seals are housed within glands which are easily withdrawn and replaced. ANDREW DELANEY explains why One of the most suitable and successful designs for hydraulic cylinders used in industrial applications is the tie-rod type, pre-torqued on assembly to offer rigidity and [...]

Original article date: June 1999 We’ve seen it done over the web with software, music and even said it with flowers. But now an e-commerce site from which industrial users can select order and pay for low power drives? Alan Quinn considers its value. The new ABB Industrial Systems e-commerce site which can be reached [...]

Original article date: April 1999 A direct-acting poppet-style proportional control valve makes it possible to extend pneumatics into proportional control. NEIL GARDNER Marketing Services Manager ASCO Joucomatic explains how. Precise proportional control using pneumatics was until relatively recently a hit and miss affair. But that direct operating proportional valves have opened up a new era [...]

Original article date: February 1998 Swedish company Control Drive has come up with an hydraulic alternative to the inverter for speed control of fans and pumps. Alan Quinn takes a look. The design of pumps and fans makes them very suitable for speed control. The result is a considerable energy saving as is often shown [...]

Original article date: February 1999 Two of the types of hydraulic accumulator in common use are the bladder type and the piston type. But which to use and when? This advice from ANDREW DELANEY of Parker Hannifin Cylinder Division. The main task of an accumulator is to take a specific amount of fluid under pressure [...]

Original article date: November 1998 ANDY LINDGREN cylinder applications engineer at Parker Hannifln’s Cylinder Division discusses the most common cause of rod seal failure. Piston rod seal leaks – even small ones – in hydraulic cylinders are no longer acceptable. After any necessary running-in the piston rod should show no ring of oil. Damaged piston [...]

Original article date: June 1995 The compressibility of air has limited pneumatic motion controls on programmable accuracy. Now MICHAEL BRISLAND describes Motron Dynamics’ air motor. By its nature motion control involves frequent changes in position direction and velocity under load conditions. Despite high response features derived from low inertia characteristics the electric motor has limitations. [...]

Original article date: November 1998 A wide range of hydraulic oils and fluids are now available to the specifier. But selection of the most appropriate often involves compromise. CLIVE DUNN technical manager of Shell UK is your guide. Industrial hydraulic oil performance is highly dependent upon base oil composition. Base oils need well-defined and consistent [...]

Original article date: June 1999 US company Motion Industries provides a taste of what you can see hear and smell in faulty hydraulic systems! A hydraulic system offers many potential problem areas; the most common being excessive noise excessive heat incorrect speed (flow) incorrect pressure or faulty operation. Before embarking on hydraulic troubleshooting a knowledge [...]

Original article date: March 1995 Vickers has released a complete and free guide to optimum fluid cleanliness in hydraulic systems – and the consequences of getting it Fluid power is one of the most reliable g and repeatable forms of power and motion control. But when problems are encountered 80 of the time they are [...]