The 1/2 Stainless Steel 316L version of the Series 553 Spool Valve from Asco Numatics meets the growing demand for pilot valves that are suitable for use in aggressive environments and explosive atmospheres. The valve is resistant to the cleaning products used in the food industry and the solvents and other compounds found in the chemical and plastics industries. The non-breathing design provides better environmental protection in clean areas and places where hygiene is paramount. Designed to provide long-term reliability under harsh operating conditions, the valves also offer high levels of environmental protection against the ingress of dust, liquids and other foreign matter. ATEX approval to category 2GD zone 1/21 makes them suitable for use in explosive atmospheres typically found in oil and gas applications both in refineries and offshore. Central to the operating reliability of the 553 range is an environmentally protected construction.