Function and configurationHydraulic pilot operated check valves type Z2S22 are sandwich plate design. They are used for the leakage-free closure of one or two service ports, even for long periods of t...
Product Detail
Function and configuration
Hydraulic pilot operated check valves type Z2S22 are sandwich plate design. They are used for the leakage-free closure of one or two service ports, even for long periods of time. Free flow occurs from A1 to A2 or B1 to B2. Flow in the opposite direction is blocked.
When fluid flows from A1 to A2, the spool (1) is pressurised and is pushed to the right, thereby opening the ball poppet valve (2) which then opens the check valve(3).
In order to make reliable closure of the two check valves in the neutral position, the service ports A1 and B1 of the directional valve must be connected to returning line.
Symbols (①=valve side, ②=sub-plate side)
Ordering code
Technical data
| Fluid | Mineral oil suitable for NBR and FKM seal |
| Phosphate ester for FKM seal | |
| Degree of contamination | Maximum permissible degree of fluid contamination: Class 9. NAS 1638 or 20/18/15, ISO4406 |
| Fluid temperature rang ℃ | -30 to +80 (NBR seal) |
| -20 to+80 (FKM seal) | |
| Viscosity range m㎡/s | 2.8 to 500 |
| Operating pressure bar | 315 |
| Max.flow-rate L/min | 450 |
| Flow direction | See symbol |
| Crack pressure(free flow direction) bar | 3,5,7.5,10 |
| Area ratio | A1/A2=1/13.6,A3/A2=1/2.8 |
| Weight kg | 12.8 |
Characteristic curves (Measured at θ_oil=40°C ±5°C, using HL)
Unit dimensions
