Piston-operated valves designed for harsh environments

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Asco Numatics is introducing the series 298-398 process valve, a new range of robust, piston-operated valves for steam, superheated water, hot and cold liquids, and inert gases. Available for use on positive pressure or vacuum service, the valves are designed to withstand the most aggressive of manufacturing processes.

With its innovative technology and stainless steel body, the compact series 298-398 valve offers exceptional reliability in challenging environments. Applications include the manufacture of tyres and rubber vulcanisation machines, and industrial processes including industrial autoclaves, foundries, heat exchangers, dyeing machines, laundry, food and beverage, chemical processing and pulp and paper. An ATEX 94/9/EC version is also available for use in potentially explosive atmospheres in categories 2 GD and 3 GD.

Comprising DN 15-20-25-32-40-50 actuators in 2/2 N/C or 2/2 N/O and 3/2U styles, with a tapped body G/RP-NPT-RC, the range is suitable for socket welding. Alternatively, the valves are available with DIN, ANSI or JIS flanges. The valves are suitable for a maximum 40bar pressure drop and the balanced design enables them to be used with back pressures up to 40bar. Highly versatile, the valves can handle fluids with a viscosity up to 5000cST and temperatures in the range of -10 to +250degC. The ambient temperature range is from -25 to +180degC.

Cost-saving features include low actuator volume for reduced air consumption, low thermal losses when used with hot media, low piloting pressure (from 1 up to 10bar) and long life. The high-performance stuffing box requires no servicing and with different parts of the valve being easy to dismount, maintenance and cleaning are quick and easy. Built for bi-directional operation, the compact and lightweight design reduces the installed piping cost. The valves’ dust and water protection system makes them suitable for mounting outdoors in any position.

The operator is designed for fast- and high-cycle duties, low air consumption and low piloting pressure, and the valves are unaffected by dirty steam. Process protection includes anti-water hammer construction, fail-safe function and back-pressure protection.

Robust construction and high-quality materials provide the valves with excellent resistance to aggressive and hot ambient atmospheres. Designed to resist the thermal shocks caused by exposure to steam and cold water, the valves have a life greater than 2million operations on saturated steam.

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