A Double Pilot Check Valve is a valve used in hydraulic systems to prevent reverse flow of fluid while allowing flow in both directions under specific conditions. This valve combines two check valves with pilot lines to provide bidirectional flow control.

 ** Main Applications : Concrete Pump Truck, Aerial work platform, Ladder truck, Drilling Rig, Crane
 ** Operating Principle

  1. Basic Check Valve Function
   - A double pilot check valve consists of two check valves.
   - A check valve allows fluid to flow in one direction only while blocking flow in the opposite direction.
  2. Opening by Pilot Pressure
   - When a specific pressure is applied to the pilot line, the check valve is forced to open, allowing fluid to flow in the  opposite direction.
   - This enables control of flow in both directions when necessary.

 

 ** Key Features
  1. Hydraulic Cylinder Control
   - Double pilot check valves are used to control double-acting cylinders.
   - They hold the hydraulic pressure to keep the cylinder stationary against external forces.
   2. Load Holding
   - Prevents loads from moving under gravitational or external forces by holding pressure in place.
   3. Safety and Stability
   - Prevents unintended cylinder movement due to pressure loss or external disturbances in hydraulic systems.