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.
General | |
Weight | see Order information |
Installation position | any |
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 flow | P→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 unit | 0,2 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. |
Description | Nominal size | Weight | Max. pressure | Basic position | Voltage | Note | Article number |
---|---|---|---|---|---|---|---|
Pumpenumlaufsteuerung, modularer Aufbau | DN65 | 114-150,7 | 420 |
Hauhinco Maschinenfabrik GmbH & Co. KG
Hölterstraße 51
45549 Sprockhövel
Германия
телефон: +49 2324 705-0
телефакс: +49 2324 705-222
sales@hauhinco.de
Многолетний опыт в сфере проектирования и производства промышленного гидравлического оборудования обеспечил компании знание технологической специфики не только горнодобывающей отрасли, но и многих других сфер промышленности.