This type is frequently used as a pilot valve for larger pneumatically actuated valves. These valves can be used in diverse applications, such as mixing, distribution, ventilation, dosing, etc. At the same time valve seat, 1 is opened and the channel between P and A is opened for the medium. The path between A and R is therefore blocked. If the coil is energised the plunger is pulled in and seals valve seat 2. ![]() At the same time, A is directly connected to R (return flow) and valve seat 2 is opened. If no electric voltage is present, a normally closed 3/2-way valve allows no passage from the pressure connection P to connection A (outlet), since a conical spring presses the plunger onto valve seat 1. As opposed to the 2-way plunger valve it has two valve seats and one return flow. The functioning principle of the direct-acting 3-way plunger valve depends on how the fittings are connected to the fluid system.
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