Check valves without/with pilot control

These hydraulic check valves are part of the spring loaded shut-off valves.

The check valves serve for blocking the supply line in the application of 

leak-free hydraulic cylinders in combination with low leaking directional 

valves.

The pilot control is effected by unlocking a seat valve in the main valve 

piston. Thereby a lesser control pressure is required to unlock the flow.

By using a pilot control also clamping cylinders with unfavorable 

area ratio can be used.

The pressure drop in the consumer line takes place gradually. 

This prevents from decompression shocks and preserves the 

connected hydraulic elements.

Advantages:

- Installation without piping

- Pilot control prevents from decompression shocks

- Allows pressure maintenance at uncoupled machine parts