Indirect acting solenoid valves are also called Pilot Operated. These valves have two chambers that are separated by a diaphragm. The pressure of the media going through lifts the diaphragm allowing the valve to fully open. We offer fewer options for Pilot Operated solenoid valves. That is because they have a requirement for a minimum pressure to work properly. The advantage is that indirect acting solenoid valves can help provide high flow rates for high pressure systems with a relatively low power consumption. If you need help deciding between indirect or direct action solenoid valves, our customer service team excels in walking customer through this process.