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Duplomatic MRQA – Unloading Valve (for Circuits with Accumulator)

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Duplomatic Oleodinamica represents the real alternative in the hydraulics market.

Duplomatic’s wide range of products and worldwide service network, grant its users a real competitive advantage.

The Duplomatic MRQA pressure relief and safety valve with automatic unloading. Upon reaching the set value, the valve freely unloads the pump and puts it under pressure again when the pressure values descend in the circuit to correspond to 63% or 75% of the set value.

In order to assure this operation, it is necessary to use an accumulator that guarantees pressure maintenance in the circuit. A check valve, incorporated in the panel or available as a plate under the valve MRQA/C, prevents the accumulator unloading through the open valve.

This system maintains the pressure in the hydraulic circuit, avoiding heating of the oil and reducing energy consumption.

It is recommended to place the accumulator as close as possible to the MRQA, without reducing the connection size.

The cycle time depends on the pump flow rate, the accumulator capacity and pre-charge, and the flow requirement of the system.

Product Specification

Description Units
Maximum Operating Pressure 350 bar
Maximum Flow Rate 40 l/min
Ambient Temperature Range -20 / +50ºC
Fluid Temperature Range -20 / +80ºC
Fluid Contamination Degree According to ISO 4406:1999 Class 21/19/16
Recommended Viscosity 25 cSt
MRQA Mass 3,3 kg
MRQA*/C Mass 4,2 kg

Duplomatic – MRQA – Unloading Valve (for Circuits with Accumulator) – Data Sheet


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