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The ASCO holds a magnetic tube, which is a cylindrical coil of insulated wires that produce magnetic fields when they are energized correctly. The asco, like other similar, standard , can either be single-threaded, 2-way threaded, 3-way threaded or 4-way threaded, referring to the number of inputs and outputs (entrances and exits) the have. The ASCO red hat ’s utility can be employed in all HVAC systems, although its most common appliance is in commercial, military aerospace equipments and for power generators. The gamut of ASCO includes , electronically enhanced , micro-miniature , pneumatic , air preparation , fuel , gas , oil , Navy , Navy air operated , Marine , and Marine air operated , process control pilot , motorized shut-off , soft-start , control gas robertshaw and islands. ASCO Red-Hat 2-way have one inlet and one outlet pipe connection and are used primarily to permit and shut off fluid flow. In Normally Closed situation fluid is shut off when the coil is de-energized, flows through the when the coil is energized. In Normally Open situation fluid flow through the when the coil is de-energized, shuts off when the coil is energized When the is energized, the core directly opens the orifice of a Normally Closed or closes the orifice in a Normally Open . The will operate at pressures from 0 psi to its rated maximum. The force needed to open the is proportional to the orifice size and fluid pressure. As orifice size increases, so does the required force. To open larger orifices without increasing size, internal pilots are used these use line pressure to assist operation.

When the coil is de-energized (on a Normally Closed ), the pilot orifice is closed and line pressure is applied to the top of the piston or diaphragm through the bleed orifice, closing the . When the coil is energized, the core opens the pilot orifice, relieving pressure from the diaphragm or piston. Line pressure, alone, opens the by lifting the diaphragm or piston off the main orifice are supplied, as listed, with either Red-Hat II molded epoxy s or Red-Hat s with metal enclosures. Asco Red-Hat II are identified by the letter "G" or "H" in their catalog numbers e.g., 8030 with the Control watt.