!0 i u y r w o t q e !1 Construction Normally closed (N.C.) Body material: C37, Stainless steel Working principles When the coil i is energized, the armature assembly y is attracted into the core of the tube assembly u and the pilot valve is opened. When the pilot valve is opened and the pressure inside the pilot chamber decreases, resulting in the pressure difference from the inlet pressure. Then, the piston assembly e is lifted and the main valve is opened. Armature assembly y interacts with piston assembly e at location . The piston assembly is pulled upward when the armature assembly is attracted to open the main valve . When the coil i is de-energized, the armature assembly y returns by the reacting force of the return spring r and the pilot valve is closed. When the pilot valve is closed, the pressure inside the pilot chamber increases, resulting that the pressure difference from the inlet pressure is lost and the main valve is closed. Component Parts No. Description Body Bonnet Piston assembly Return spring O-ring Armature assembly Tube assembly Solenoid coil Hexagon socket head bolt Name plate Clip Body material C37 specifications Material C37 Stainless steel PPS, Stainless steel (PTFE, FKM) Stainless steel FKM Stainless steel, PPS Stainless steel . Stainless steel AL SK Body material stainless steel specifications 1 Stainless steel 2 3 4 5 6 7 8 9 10 11 The materials in parentheses are the seal materials. For Steam Series VXS22/23 178