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Pressure relief valves DN20-DN25 PN450-PN500

  • Operating pressure: 500bar
  • Nominal size(s): DN20, 25
  • max. Flow rate: 700l/min

Features

  • Directly actuated pressure relief valve
  • Seat valve with a leak-free, metallic conical seat seal
  • All parts are made of corrosion-resistant materials, and they are easily replaceable.
  • Hydraulic accumulator as a preload element, adjustable spring (force)
  • Attachment, structural plate form or fl ange design

Pressure relief valve for the primary pressure setting at the hydraulic pumps and the pressure protection of the hydraulic drives and hydraulic components.

In the basic valve position, the hydraulic power of the hydraulic accumulator (7) acts on the piston valve (4) and transfers it to the valve piston (3). The valve seat (2) and the valve piston (3) form the valve seal at the conical surface. On the gas side, the hydraulic accumulator (7) has been prefi lled with nitrogen and is preloaded hydraulically with the pressure setting on the liquid-side until the requested pre-set pressure „Pe“ is reached. The gas within the accumulator is compressible and acts as a fl exible spring

Within the operation of the valve, the system pressure „Ps“ enters the valve body (1) at the P-connector generating a hydraulic (opening) force at the valve seat area of the valve piston (3). The piston valve (4) maintains the valve piston (3) in the shut o basic position as long as the hydraulic opening force is < than the closing force at the piston valve (4). If the system pressure „Ps“ increases to the extent that the force ratio reverses to be opening force > closing force, then the valve piston (3) is pressed out of the basic position, lines P and T are connected thus opening the valve. The valve opening increases proportionally with increasing system pressure until the maximum admissible volume fl ow for the valve has been reached, see valve characteristic

The pressure of the valve is set via the adjustment valves (5, 6). Thus, the pressure of the accumulator (7) is set. Depending on the pressure setting of the accumulator a hydraulic power is generated, which is transferred to the valve piston (3). From the control ratio „SK“ (see Technical data) and the pre-set pressure „Pe“ follows the required accumulator pressure „Pap“.

Technical data

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

General

WeightDN3 1,3kg
DN6 2,4kg
Installation positionany
Ambient temperature-10 to 50°C (hydraulic fl uids, heed standard requirements)
Material Valve parts
Material Seals		Stainless steel, bronze
NBR, PTFE, PUR

Hydraulic

hydraulic pressure connector P, M≤ 400 bar bzw. ≤ 500bar, see Order information
hydraulic pressure connector T<= 50bar (observe counterpressure within the pressure setting)
Setting range of hydraulic response pressurePeDN20: 30 – 450 bar
DN25: 30 – 500 bar
Control ratio SkDN20: 1:1,9 – 2,20 (area piston valve/valve piston)
DN25: 1:2,0 – 2,22 (area piston valve/valve piston)
Pressure range accumulator PSp14 – 260 bar
max. volume flowDN20 500 l/min
DN25 700 l/min
direction of flowP->T
Pressure fluid
- Medium - Temperature range
- Medium - Quality
- min fi lter fi neness		Water, HFA
5 bis 40°C
see Hauhinco media requirement, water, HFA
Filter fi neness 100µm
Pressure fluid
- Medium - Temperature range
- Medium - Quality		Mineral oil HLP according to DIN51624-2
5 to 50°C
Cleanliness class -/19/16 according to ISO 4406
Optional featuresPressure display „PSp“, see order data
Use of other pressure fl uids on request.

Included in the scope of supply

Mounting screws for the valves
Pressure setting according to customer specification
Factory test certificate on request

Versions

DescriptionNominal sizeWeightMax. pressureBasic positionVoltageNoteArticle number
Pressure relief valve U504DN2022,0kg400--Einstellbereich 30-400bar6159362
Pressure relief valve DN20DN2016kg500--Einstellbereich 30-450bar6261981
Pressure relief valve DN20, with pressure displayDN2016,0kg500--Einstellbereich 30-400bar6392660
Pressure relief valve DN20, with pressure displayDN2016,0kg500--Einstellbereich 30-250bar6267092
Pressure relief valve DN20DN2030,0kg500--Einstellbereich 30-500bar6167861
Pressure relief valve DN25, with pressure displayDN2530,5kg500--Einstellbereich 30-400bar6272673
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Контакты

Hauhinco Maschinenfabrik GmbH & Co. KG
Beisenbruchstraße 10
45549 Sprockhövel
Германия

телефон: +49 2324 705-0
телефакс: +49 2324 705-222 
sales@hauhinco.de

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