Hydrastore power unit

Atos Relief Valve Module

Complete Relief Valve Module data, part of the Atos Directional Valves & Modules range at Hydrastore

 illustration 1

HMP are direct operated pressure relief valves. HM and KM are double stage pressure relief valves with balanced poppet 1.

The pressure adjustment is operated by loosening the locking nut 2 and turning the screw 3 protected by the cap 4. Optional versions with setting adjustment by handwheel 5 instead of the screw available on request. Clockwise rotation increases the pressure.

Valve size and max flow:

Ordering Chart

Part noSymbolDescriptionMax flowMax pressure
HMP-011-***HMP-011-*** symbolCETOP 03 relief valve module35350
HMP-012-***HMP-012-*** symbolCETOP 03 relief valve module35350
HMP-013-***HMP-013-*** symbolCETOP 03 relief valve module35350
HMP-014-***HMP-014-*** symbolCETOP 03 relief valve module35350
HMP-015-***HMP-015-*** symbolCETOP 03 relief valve module35350
HM-011-***HM-011-*** symbolCETOP 03 relief valve module60350
HM-012-***HM-012-*** symbolCETOP 03 relief valve module60350
HM-013-***HM-013-*** symbolCETOP 03 relief valve module60350
HM-014-***HM-014-*** symbolCETOP 03 relief valve module60350
HM-015-***HM-015-*** symbolCETOP 03 relief valve module60350
KM-011-***KM-011-*** symbolCETOP 05 Relief valve module120350
KM-012-***KM-012-*** symbolCETOP 05 Relief valve module120350
KM-013-***KM-013-*** symbolCETOP 05 Relief valve module120350
KM-014-***KM-014-*** symbolCETOP 05 Relief valve module120350
KM-015-***KM-015-*** symbolCETOP 05 Relief valve module120350

Available Pressure range (bar)

3 MAIN CHARACTERISTICS, SEALS and HYDRAULIC FLUIDS - for other fluids not included in below table, consult our technical office

Assembly position / location
Any position
Subplate surface finishing
Roughness index Ra 0,4 - flatness ratio 0,01/100 (ISO 1101)
MTTFd values according to EN ISO 13849
150 years, for further details see technical table P007
Ambient temperature
Standard execution = -30°C ÷ +70°C
/PE option = -20°C ÷ +70°C
/BT option = -40°C ÷ +70°C
Seals, recommended fluid temperature
NBR seals (standard) = -20°C ÷ +60°C, with HFC hydraulic fluids = -20°C ÷ +50°C
FKM seals (/PE option)= -20°C ÷ +80°C
HNBR seals (/BT option)= -40°C ÷ +60°C, with HFC hydraulic fluids = -40°C ÷ +50°C
Recommended viscosity
15÷100 mm2/s - max allowed range 2.8 ÷ 500 mm2/s
Fluid contamination class
ISO 4406 class 21/19/16 NAS 1638 class 10, in line filters of 25 µm (β25 ≥75 recommended)
Hydraulic fluidSuitable seals typeClassificationRef. Standard
Mineral oilsNBR, FKM, HNBRHL, HLP, HLPD, HVLP, HVLPDDIN 51524
Flame resistant without waterFKMHFDU, HFDRISO 12922
Flame resistant with waterNBR, HNBRHFC

4 REGULATED PRESSURE VERSUS FLOW DIAGRAMS (Based on mineral oil ISO VG 46 at 50°C)

, section 4, illustration 1, section 4, illustration 2, section 4, illustration 3

5 MINIMUM PRESSURE VERSUS FLOW DIAGRAMS (Based on fluid viscosity of 25 mm2/s at 40°C)

, section 5, illustration 1, section 5, illustration 2, section 5, illustration 3