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.
Data sheet 700-11
spring loaded shut-off valves
pmax. 500 bar (ports A, B, Z), depressurized (port L)
Qmax. 20 l/min resp. 30 l/min
hydraulic oil acc. to DIN 51524 Tl.1 up to 3; ISO VG 10 up to 68 acc. to DIN 51519
Data sheet (PDF):
For technical details and dimensional drawings download the current data sheet.
Circuit symbols:
Product configurator:
With our product configurator, you can put together your desired products step by step. Then the following options are available:
- generate an order number
- request a quote
- download of 3D models