Stainless steel NAMUR and body ported pilot valves been developed for use in corrosive and hazardous environments in the petrochemical, process, chemical, oil and gas and food industries.
Asco Joucomatic's new 551 series of stainless steel (316L) valves has been developed for use in corrosive and hazardous environments in the petrochemical, process, chemical, oil and gas and food industries. ATEX approved for all categories including 1GD (zones 0/20) and/or SIL level 4, the marine grade (316L) stainless steel valves are particularly suited to piloting process actuators in hazardous areas, both on and offshore. Designed with an environmentally protected construction, the 551 valves offer the highest levels of protection against the ingress of liquids, dust or any other foreign matter.

They also provide the user with the facility for all valve exhausts to be piped away, providing enhanced environmental protection in sensitive areas such as clean rooms, and in market sectors such as pharmaceutical and food processing.

To ensure reliability in the most corrosive environments, the 551 valves employ internal parts of 316L or 304L stainless steel and high performance seals of silicone and polyurethane.

This combination enables the valves to be used on filtered air and neutral gases at pressures up to 10bar, and across a wide ambient temperature range from -40 deg C to +60 deg C.

The 551 series are 1/4in valves which are available in both NAMUR interface and body ported (BSP and NPT) versions.

They are offered as of 3/2 or 5/2 configurations, with either monostable (solenoid/spring) or bistable (solenoid/solenoid) operators.

In both cases, the solenoids have the option of being equipped with manual (impulse-type) overrides.

The flexibility of the 551 valve design means that it can be equipped with the full range of Asco Joucomatic solenoid enclosures, including IP65 epoxy-moulded general purpose types; intrinsically safe waterproof versions; increased safety EEx em types; cast iron/aluminium EEx d variants; and UL and CSA approved units.

In addition, the 551 Series can be used with Asco Joucomatic's new family of flameproof (II 2 G/D EEx d IIC) operators.

Meeting Category 2 requirements of the ATEX directive, the introduction of the stainless steel WSNF operator is part of an new overall package from Asco Joucomatic, providing the offshore oil and gas markets with all-stainless steel valves and operators for tasks such as piloting large actuators, or operating diaphragm or diverter valves, directly.