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Pressure relief valve for the primary pressure setting at the hydraulic pumps and the pressure protection of the hydraulic drives and hydraulic components.
In the basic valve position, the hydraulic power of the hydraulic accumulator (7) acts on the piston valve (4) and transfers it to the valve piston (3). The valve seat (2) and the valve piston (3) form the valve seal at the conical surface. On the gas side, the hydraulic accumulator (7) has been prefi lled with nitrogen and is preloaded hydraulically with the pressure setting on the liquid-side until the requested pre-set pressure „Pe“ is reached. The gas within the accumulator is compressible and acts as a fl exible spring
Within the operation of the valve, the system pressure „Ps“ enters the valve body (1) at the P-connector generating a hydraulic (opening) force at the valve seat area of the valve piston (3). The piston valve (4) maintains the valve piston (3) in the shut o basic position as long as the hydraulic opening force is < than the closing force at the piston valve (4). If the system pressure „Ps“ increases to the extent that the force ratio reverses to be opening force > closing force, then the valve piston (3) is pressed out of the basic position, lines P and T are connected thus opening the valve. The valve opening increases proportionally with increasing system pressure until the maximum admissible volume fl ow for the valve has been reached, see valve characteristic
The pressure of the valve is set via the adjustment valves (5, 6). Thus, the pressure of the accumulator (7) is set. Depending on the pressure setting of the accumulator a hydraulic power is generated, which is transferred to the valve piston (3). From the control ratio „SK“ (see Technical data) and the pre-set pressure „Pe“ follows the required accumulator pressure „Pap“.
General | |
Weight | DN3 1,3kg DN6 2,4kg |
Installation position | any |
Ambient temperature | -10 to 50°C (hydraulic fl uids, heed standard requirements) |
Material Valve parts Material Seals | Stainless steel, bronze NBR, PTFE, PUR |
Hydraulic | |
hydraulic pressure connector P, M | ≤ 400 bar bzw. ≤ 500bar, see Order information |
hydraulic pressure connector T | <= 50bar (observe counterpressure within the pressure setting) |
Setting range of hydraulic response pressurePe | DN20: 30 – 450 bar DN25: 30 – 500 bar |
Control ratio Sk | DN20: 1:1,9 – 2,20 (area piston valve/valve piston) DN25: 1:2,0 – 2,22 (area piston valve/valve piston) |
Pressure range accumulator PSp | 14 – 260 bar |
max. volume flow | DN20 500 l/min DN25 700 l/min |
direction of flow | P->T |
Pressure fluid - Medium - Temperature range - Medium - Quality - min fi lter fi neness | Water, HFA 5 bis 40°C see Hauhinco media requirement, water, HFA Filter fi neness 100µm |
Pressure fluid - Medium - Temperature range - Medium - Quality | Mineral oil HLP according to DIN51624-2 5 to 50°C Cleanliness class -/19/16 according to ISO 4406 |
Optional features | Pressure display „PSp“, see order data |
Use of other pressure fl uids on request. | |
Included in the scope of supply | |
Mounting screws for the valves | |
Pressure setting according to customer specification | |
Factory test certificate on request |
Description | Nominal size | Weight | Max. pressure | Basic position | Voltage | Note | Article number |
---|---|---|---|---|---|---|---|
Pressure relief valve U504 | DN20 | 22,0kg | 400 | - | - | Einstellbereich 30-400bar | 6159362 |
Pressure relief valve DN20 | DN20 | 16kg | 500 | - | - | Einstellbereich 30-450bar | 6261981 |
Pressure relief valve DN20, with pressure display | DN20 | 16,0kg | 500 | - | - | Einstellbereich 30-400bar | 6392660 |
Pressure relief valve DN20, with pressure display | DN20 | 16,0kg | 500 | - | - | Einstellbereich 30-250bar | 6267092 |
Pressure relief valve DN20 | DN20 | 30,0kg | 500 | - | - | Einstellbereich 30-500bar | 6167861 |
Pressure relief valve DN25, with pressure display | DN25 | 30,5kg | 500 | - | - | Einstellbereich 30-400bar | 6272673 |