These directional valves control the oil flow in combination with hydraulic power packs (YHH-4/3 with hand pumps).
All valves have 3 lever positions to control movement of the connected hydraulic cylinder:
- left: cylinder advance.
- middle: cylinder neutral (pressureless circuit).
- right: cylinder retracts.
In the middle position (hold) the piston of the cylinder stops and the oil flow is guided in a circuit back to the reservoir (P to T). The valves can be flanged directly onto power packs but can also be connected by using hydraulic piping.
In addition, all valves are equipped with a second pressure oil port P at the back of the valve base.
This port can easily be used to connect a pressure gauge and a pressure relief valve (e.g. VPR-1). The oil port T shall always be connected to the reservoir without any back pressure.
DOWNLOAD:
Brochure VHH
Brochure VHP
Technical data Yale Directional valves, 700 bar – VHP & VHH:
| Modell | EAN-No. 4025092* | Pressure max. | Size | Oil ports | Applications |
|---|---|---|---|---|---|
| l/min | |||||
| VHP-3/3-1 | *155175 | 8 - 16 | 1 | 3/8 NPT | 3/3-way valve with “open centre“ in middle position (pressureless circuit) to control single-acting hydraulic cylinders, standard valve for smaller power packs, size 1. |
| VHP-3/3-2 | *155199 | 20 - 40 | 2 | 3/8 NPT | 3/3-way valve with “open centre“ in middle position (pressureless circuit) to control single-acting hydraulic cylinders, standard valve for larger power packs, size 2. |
| VHP-3/3-1 CC | *155182 | 8 - 16 | 1 | 3/8 NPT | 3/3-way valve with “closed centre“ in middle position to control single-acting hydraulic cylinders, only for specific multiple valve configuration, size 1. |
| VHP-3/3-2 CC | *155205 | 20 - 40 | 2 | 3/8 NPT | 3/3-way valve with “closed centre“ in middle position to control single-acting hydraulic cylinders, only for a multitude of valve operations, size 2. |
| VHP-4/3-1 | *154857 | 8 - 16 | 1 | 3/8 NPT | 4/3-way valve with “open centre“ in middle position (pressureless circuit) to control double-acting hydraulic cylinders, standard valve for smaller power packs, size 1. |
| VHP-4/3-2 | *154864 | 20 - 40 | 2 | 3/8 NPT | 4/3-way valve with “open centre“ in middle position (pressureless circuit) to control double-acting hydraulic cylinders, standard valve for larger power packs, size 2. |
| VHP-4/3-1 CC | *154932 | 8 - 16 | 1 | 3/8 NPT | 4/3-way valve with “closed centre“ in middle position to control double-acting hydraulic cylinders, only for specific multiple valve configuration, size 1. |
| VHP-4/3-2 CC | *154956 | 20 - 40 | 2 | 3/8 NPT | 4/3-way valve with “closed centre“ in middle position to control double-acting hydraulic cylinders, only for specific multiple valve configuration, size 2. |
| VHH-4/3 | *154840 | 2 - 3 | small special design | 1/4 NPT | 4/3-way valve with “open centre“ in middle position (pressureless circuit) to control double-acting hydraulic cylinders. Special design to be mounted directly to all HPS hand pumps (with connecting set FY-703). Also suitable for small hydraulic power packs. |