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Pump Unloader Control DN16-DN65 PN420

  • Operating pressure: 420bar
  • Nominal size(s): DN40

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, fl ange 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 fl ow 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 fl ow 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 to 50°C (hydraulic fl uids, heed standard requirements)
Material Valve parts
Material Seals		Stainless steel
NBR, PTFE, PUR

Hydraulic

<h4Pump unloader control DN40, 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
5 to 40°C
see Hauhinco media requirement, water, HFA
Filter fineness 100µm
Filter fineness 25µm
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
Use of other pressure fluids on request.
Note: The maximum decrease volume flow of the consumer and the size of the
pressure accumulator control the switching rate of the pump circulation control system.

Versions

DescriptionNominal sizeWeightMax. pressureBasic positionVoltageNoteArticle number
Pump unloader controlDN4065 - 134.7420
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Spec sheet
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Catalogue

联系方式

Hauhinco机械制造 GmbH & Co. KG
Hölterstraße 街51号
德国  45549斯普罗克霍威尔

电话.: +49 2324 705-0
传真: +49 2324 705-222
电子邮箱
sales@hauhinco.de

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