Check valves witout/with pilot control

Check valve
without pilot control,
hydraulically unlockable

Description

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 flow B→A is permanently open. In the opposite direction A→B the flow is locked. It can be unlocked by pressurizing the control port Z. The minimum pressure for that depends on the pressure load at port A.

The check valve with a capacity of 20 l/min is not equipped with a pilot control. The valve with a capacity of 50l/min is optional available without or with pilot control. In application with higher pressure and volume flow we recomment check valves with pilot control. 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. By their design with manifold connection the check valves without/with pilot control facilitate fixtures without piping. Uncoupled machine parts eg. pallet systems can be kept pressurized by using these shut-off valves.

Special features:

space-saving installation options
installation without piping
pilot control prevents from decompression shocks
allows pressure maintenance at uncoupled machine parts

Important information:

Faults can occur in the pressure ratio if the pressure load is too low to unlock the valve. This can effect dangerous malfunctions when decompressing swing clamp cylinders and pull cylinders. Such clamping cylinders must be operated with check valves equipped with pilot control. These valve types are designed for a much lower control pressure. To relieve the piston chamber, a drain connection is required. This must be protected from ingress of dirt and liquids.