Intermediate Hydraulics Practice Test 2026 - Free Hydraulics Practice Questions and Study Guide

Double pilot-operated check valves are designed to hold a load in position when flow is blocked. They combine a one-way check valve with two pilot controls so the valve stays closed and resists backflow unless a pilot signal is applied to open it. In practice, when no pilot pressure is present, the valve prevents movement, which keeps the actuator (like a hydraulic cylinder) in its current position despite leakage or blockages downstream. When a pilot signal is applied, the valve opens to allow controlled movement in the desired direction, but without that signal it locks the load in place. This makes the device especially useful for maintaining position when flow is blocked, unlike options that describe speed, friction reduction, or cooling, which aren’t functions of this valve.