Pilot Operated Check Valve

What is double pilot-operated check valve?

The double-acting pilot-operated hydraulic check valve blocks the hydraulic flow in both directions, holding the cylinder in both positions. When pilot pressure is applied, the valve unlocks in both directions, allowing bi-directional flow and enabling more complex cylinder movement.

Function

 

The bidirectional pilot operated check valve consists of two hydraulic control one-way valves and a pilot valve core and has good locking performance.

 

The oil is allowed to flow freely from V1 to C1 or V2 to C2, while the valves remain closed (blocked) in the opposite directions (C1 to V1 or C2 to V2) to hold or lock the hydraulic cylinder or other actuators; reverse flow occurs only when there is sufficient pilot pressure at V1 or V2, at which point V1 or V2 acts as the pilot port for the other side and pushes the piston pushing the valve core off the valve seat.

 

Product Display

1. Construction machinery (our hydraulic lock products are mainly used in construction machinery vehicles)
Application function: Prevent the cylinder from accidentally moving due to load or system pressure relief, ensuring the stability and safety of the equipment.
Typical scenarios:

Crane/hoist: Lock the outrigger cylinder to prevent the outrigger from retracting during lifting.

Aerial work platform: Keep the boom position to prevent sudden drop due to hydraulic leakage.

Excavator: Lock the travel motor to prevent the equipment from slipping during slope operation.

2. Wind power equipment
Application function: Achieve safe locking in the wind turbine pitch and yaw system to avoid loss of control caused by strong wind impact.
Typical scenarios:

Pitch system: Lock the blade angle to ensure that the blade is fixed when the machine is shut down or fails.

Yaw brake: Cooperate with hydraulic brake to prevent accidental rotation of the cabin.

3. Industrial hydraulic system
Application function: Maintain the position of fixtures and molds in the production line to improve accuracy and safety.
Typical scenarios:

Injection molding machine: Lock the mold cylinder to maintain pressure to prevent mold cracking.

Pressing equipment: Maintain the position of the pressure head to prevent the workpiece from shifting.

Metallurgical machinery: Lock the crystallizer of the continuous casting machine to prevent molten steel from leaking.

4. Agricultural machinery
Application function: Stabilize the lifting arm or suspension device to prevent the agricultural implement from falling due to gravity.

Typical scenarios:

Tractor hydraulic suspension: Maintain the working height of the plow and seed drill.

Harvester granary: Lock the unloading oil cylinder to prevent the door from accidentally opening during transportation.

5. Marine and port equipment
Application function: Resist wave impact and salt spray corrosion to ensure long-term reliable locking.

Typical scenarios:

Marine deck crane: Fix the boom position.

Offshore platform anchor machine: Lock the anchor chain hydraulic motor.

6. Special vehicles
Application function: Realize emergency braking or position retention in special equipment such as military vehicles and fire trucks.

Typical scenarios:

Fire ladder: Lock the extension arm to ensure the safety of high-altitude rescue.

Armored vehicle turret: Fix the weapon pitch angle.

Unique advantages of hydraulic locks
Demand scenarios Functions of hydraulic locks
Load holding Lock the load position for a long time without continuous pressure supply.
Safety protection Prevent the cylinder from falling uncontrollably due to pipeline rupture or pump shutdown.
Energy saving Reduce system pressure maintenance energy consumption and reduce hydraulic oil temperature rise.
Precision control Cooperate with throttle valve to achieve smooth load descent (such as machine tool feed).

 

Exhibition

 

 

 

 

Shandong Yikaide Hydraulic Co., Ltd. is one of the most professional pilot operated check valve manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized pilot operated check valve made in China here from our factory.