General purpose valves cover an enormous range of basic applications. If you want to simply control water, air, or inert Gas, this range of valves will have you covered. Brass and Stainless Steel body materials are available, as well as a varied selection of seal / diaphragm materials depending on media & application. Normally closed valves can be used in any fail safe applications, meaning that in the event of power failure, the solenoid valves will spring closed. Normally-open valves are also available to cater to the rare instance a pipeline needs to stay open in the event of loss of power. The standard range of Asco General Purpose Solenoid Valves include the 238, 210, 262, 256, 356 and 320 series.