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Accumulator unloading valve
Accumulator unloading valves Accumulator unloading valves

SYMBOl Accumulator unloading valve
Sandwich construction
• 1-point adjustment NG6
• Pilot operated ISO 4401-03
• Q max = 24 l/min
• p max = 400 bar
• p = 350 bar
N max
DESCRIPTION FUNCTION APPLICATION
Sandwich type pilot operated accumulator un- If the P pressure exceeds the adjustable un- Accumulator loading valves are used in hydrau-
rEMarK! ScrEw-IN cartrIDGES INStallED loading valve. Mounting interface acc. to ISO loading point, the pilot spool is opening the lic systems with accumulators. They allow a low
Detailed performance data and additional hydraulic speci- The following screw-in cartridges are used in the sandwich body: 4401-03. The valve is available with two types pilot valve. A control flow starts to flow and the cost, energy saving system design in cases
fications may by drawn from the data sheets of the corres- of setting, both interlockable. There are three back end of the main spool is depressurised. where the cylinder flow demand varies consi-
20 ponding installed pressure relief cartridge. Type 10 Designation Data sheet no. pressure stages to choose from. The valve has The resultant pressure difference displaces the derably or for retaining pressures over a period
US.PM22 Accumulator unloading valve an adjustable unloading point and a defined main spool towards the spring and the valve of time, e.g. for clamping processes. Note: An
• pilot operated 2.1-548 re-switching difference. The steel bodies of switches to unloading circulation. Because of additional relief valve for system protection
cautION! the sandwich valve are phosphate coated. the difference in section in the pilot aerea, the must be installed. Please refere to the set-up
The performance data especially the „pressure-flow- Steel cartridge body and adjustment spindle pilot flow is interrupted as soon as the pressure and connection exemple on page 2.
∗
characteristic„ on the data sheets of the screw-in catridges galvanised to protect them against corrosion. in the accumulator drops by 15 % or 25 % of
refere to the screw-in cartridges only. The additional press- The aluminium knob has a natural anodised the upper switching point. The pressures at
ure drop of the flange body respectivly sandwich body must finish. The quality of this product is reflected in the main spool are equilibrated and the spring
be taken into consideration. the good performance data and design. displaces the main spool to the closed position.
The pump can now build up the system pres-
sure again as far as the unloading point and
the cycle starts again.

DIMENSIONS
TYPE CODE
20 10 US S A06 - P #

Accumulator unloading valve, pilot operated

∗ Type of adjustment screw S
knob D
Sandwich construction
International standard interface ISO, NG6
20 10
Type list / function in P
Pressure range p N 100 bar 100
∗ The exterior dimensions of the cartridge can be obtained from the ∗ 160 bar 160
corresponding data sheet 2.1-548 350 bar 350
Design-Index (Subject to change)

PARTS LIST SEt-uP aND cONNEctION ExEMPlES
Unloading point adjusted at 100 bar (OS) GENERAL SPECIFICATIONS HYDRAULIC SPECIFICATIONS
Position Article Description Differential value 15% Description Pilot operated accumulator unloading valve Fluid Mineral oil, other fluid on request
Loading point: (US) = OS minus 15% = 85 bar Norminal size NG6 according to ISO 4401-03 Contamination efficiency ISO 4406:1999, class 18/16/13
10 160.2052 O-ring ID 5,28x1,78 Gas side of accumulator loaded upto max. 90% of US = 76 bar Construction Sandwich construction (Required filtration grade ß6…10≥75)
refer to data sheet 1.0-50/2
Mounting
4 holes for socket cap screw M5
20 238.2406 Plug VSTI G1/4"-ED or studs M5 Viskosity range 12 mm /s…320 mm /s
2
2
Connections Connection plates Fluid temperature -20…+70 °C
Multi-station flange subplate Peak pressure p max = 400 bar
Longitudinal stacking system Norminal pressure p = 100 bar, p = 160 bar, p = 350 bar
N
N
N
Mounting position any Minimum pressure p = 50 bar for p 160 / 350 bar
min
N
Ambient temperature -20...+50 °C p = 25 bar for p 100 bar
min
N
Fastening torque M = 5,5 Nm (Qual 8.8) for fixing screw Diff. unloading/loading 15 ± 3 % for p = 160 / 350 bar
N
D
M = 50 Nm for screw cartridge 25 ± 3 % for p = 100 bar
D
N
Weight m = 1,7 kg Volume flow Q = 1…24 l/min
min
(over 24 l/min on request)
Leakage volume flow Maximum 4 drops/min
Technical explanation see data sheet 1.0-100 in accumulator operation P - T
For further hydraulic characteristics refer to data sheet: 2.1-548
Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no. Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no.
Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.1-920E 2/2 Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.1-940E 1/2
CH-3714 Frutigen Edition 03 35 CH-3714 Frutigen Edition 03 35
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