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Pump Unloader Control, DN65 PN420, modular construction

Features

  • Electro-hydraulically actuated valve
  • The pump unloader control is modular designed based on the 2/2 way valve
  • Pilot valve as a separate unit to be attachment, 3/2 way or 2/2 way in diffrent versions
  • Further components optional: Non-return valve, Pressure relief valve, filter and optical clogging indicator
  • The valve seats seal hermetically preventing internal leaks
  • All parts are made of corrosion-resistant materials, and they are easily replaceable
  • Attachment, flange design to be mounted directly to pumps
  • Internal pressure supply of the pilot control
  • Internal or external leakage return of the pilot control

Control function

The pump unloader valve, and the pilot valve form a valve unit controlling a pump in a pressure supply system with a pressure accumulator. Depending on the system pressure, the valve controls the working cycle of the pump, „pressure build up“, „load accumulator“ or „depressurised bypass“. The P-connector is connected to the pressure port of the pump, the A-connector to the pressure line of the system and the T-connector to the pressure-free tank.

The flow of the pump enters the pump unloader valve at the P-connector. The pump flow is connected to the pressure port of the pilot valve (1) via the filter (5). In the circulation position, the control piston (3) of the 2/2-way valve (2) is pressure-relieved on the control side, the 2/2-way valve is open and the pump flow is pressureless discharged from P to T.

By switching over the pilot valve (1), the piston (3) is pressurized on the control side and the 2/2-way valve (2) closes and blocks the connection P to T. At the same time, the check valve (4) opens and connects the lines P to A. The pump flow is supplied via the A connection to the system.

Technical data

measured with HFA medium 97/3%, at 20°C

General

Weightsee Order information
Installation positionany
Ambient temperature-10 bis 50°C (hydraulic fluids, heed standard requirements)
Material Valve parts
Material Seals
Stainless steel
NBR, PTFE, POM

Hydraulic

Pump unloader control DN65, PN420

Hydraulic pressure connector P, A, MA≤ 420 bar
Hydraulic pressure connector Y≤ 2 bar
Hydraulic pressure connector≤ 2 bar
Direction of flowP→T, P→A
Pressure fluid
- Medium - Temperature range
- Medium - Quality
- min. filter fineness connection P, A
- min. filter fineness Pilot control valve
Water, HFA
see Hauhinco media requirement, water HFA
5 - 40°C
Filter fineness 10μm
Filter fineness 25μm (im Anschlussblock)
Pressure fluid
- Medium - Temperature range
- Medium - Quality
- Viscosity
Mineral oil HLP according to DIN51624-2
5 to 50°C
Cleanliness class -/19/16 according to ISO 4406
0.6 up to 100 mm2/s
max. switching rate of the valve unit0,2 Hz
Note: The maximum decrease volume fl ow of the consumer and the size of the pressure accumulator control the switching rate of the pump circulation control system.
Use of other pressure fl uids on request.

Versions

DescriptionNominal sizeWeightMax. pressureBasic positionVoltageNoteArticle number
Pumpenumlaufsteuerung, modularer AufbauDN65114-150,7420

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