Complete model designation
Specify size, high-vent option where required, cover type and design number. The catalogue identifies design number 10 for LB-16 and LB-25, and 11 for LB-32 and LB-50.
Yuken Pressure relief and vent control
LB Series relief logic valves
Compare LB relief logic valve sizes, pressure settings and vent-control covers for manifold-mounted pressure control.
4 sizesCatalogue model range
315 Kgf/cm²Maximum operating pressure
125 to 1200L/min. maximum flow by size
4 - 315Kgf/cm² pressure-adjustment range
Pressure relief and vent control
LB relief logic valves control hydraulic line pressure and protect pumps and control valves against excessive pressure. Vent circuits allow remote pressure control and unloading arrangements.
The catalogue lists LB-16, LB-25, LB-32 and LB-50, with standard, Z1 and Z2 cover configurations. Select the cover together with the manifold and pilot circuit.
Confirm the complete cartridge, cover and manifold arrangement against the catalogue installation drawings.
Models and flow limits
| Model | Maximum flow, L/min. | Minimum flow, L/min. |
|---|---|---|
| LB-16 | 125 | 5 |
| LB-25 | 250 | 5 |
| LB-32 | 500 | 8 |
| LB-50 | 1200 | 10 |
Above 250 Kgf/cm², the catalogue requires flow above 15 L/min. for every model. Apply this requirement in addition to the size-specific minimum-flow values.
Maximum operating pressure for the listed models: 315 Kgf/cm².
Cover and vent-control options
| Code | Catalogue function |
|---|---|
| None | Standard cover |
| Z1 | Vent-controlled cover; refer to the Z1 circuit symbol |
| Z2 | Vent-controlled cover; refer to the Z2 circuit symbol |
| V | High-vent-pressure option in the model designation |
Cover codes identify different pilot circuits. Review the corresponding hydraulic symbol before confirming a configuration.
Ordering and configuration
Pressure and control requirements
The listed pressure-adjustment range is 4 - 315 Kgf/cm². Confirm the required set pressure, vent circuit and unloading-to-loading behaviour before selecting the high-vent-pressure option.
Selection support
Confirm the valve and pilot circuit
A full model code, nameplate photograph and circuit drawing help identify the required assembly.
- Valve family, size and complete model code
- Operating pressure and required flow
- Cover type, pilot passages and orifice details
- Pressure settings and unloading requirements
- Manifold cavity and mounting drawing
- Hydraulic fluid, seal requirements and quantity
LB logic valve catalogue
Open the LB section of the full Yuken logic valve catalogue for specifications, symbols and installation details.
Enquire about LB logic valves
Send your model code and circuit details to Shree Hydraulics in Belagavi for product selection and quotation enquiries across India.