The Yale VPS-1 is an adjustable pressure switch with control range from 100 to 800 bar, providing an electrical micro-switch output (alternating contact) when pressure reaches a set value. Yale designs the VPS for automatic pressure limiting, pressure value reporting, and as an automatic motor on/off switch within pressure-guard power packs.
Electrical switching from hydraulic pressure
Yale documentation lists three primary VPS applications: automatic pressure limiting (cuts power when pressure exceeds set value), reporting of a certain pressure value (to PLC or alarm), and automatic motor on/off switching with pressure-guard power packs. As soon as the pressure has reached the set value, the micro-switch is activated. Should the pressure drop, the micro-switch starts the pump again to rebuild pressure. The repeat accuracy is 10 bar.
Suitable Applications
Per Yale: automatic pressure limiting, pressure-value reporting to control systems, and automatic motor on/off switching for Yale pressure-guard power packs. The pressure-guard application is particularly useful where load pressure must be maintained over very long periods.
Valves must share the system pressure rating with the pump and cylinder — the circuit is limited by its lowest-rated component.
Key Features
- Adjustable Control Range: 100 - 800 bar.
- Micro-Switch with Alternating Contact: electrical signal when set pressure reached.
- 5 A / 250 V Electrical Rating: Yale-specified contact rating.
- 3/8 NPT Oil Port: Yale standard interface.
- Compact Form Factor: 130 x 85 mm; 0.5 kg.
- Repeat Accuracy 10 bar: Yale-specified switching tolerance.
Technical Specifications
| Control Range |
100 - 800 bar |
| Electrical Data |
5 A / 250 V (micro-switch alternating contact) |
| Oil Port |
3/8 NPT |
| Switch Point Difference |
25 - 70 bar |
| Repeat Accuracy |
10 bar |
| Dimensions |
130 x 85 mm |
| Weight |
0.5 kg |
| Yale Art-No |
N14100639 |
Frequently Asked Questions
Q: Switch point difference vs repeat accuracy?
Yale specifies switch point difference as 25-70 bar - the hysteresis between switch-on and switch-off pressures. Repeat accuracy is 10 bar - consistency of the switch point across successive operations.
Q: What's pressure-guard operation?
Yale documents the VPS use with pressure-guard power packs: as soon as pressure reaches the set value, the micro-switch is activated. Should pressure drop, the micro-switch starts the pump again to rebuild pressure - enabling automatic load-pressure maintenance.
