Hydraulic systems & components


Electro-proportional relief valve

Third Quarter 2021 Hydraulic systems & components

The new RPEI provides smooth, precise control of fan speed with full-flow relief to protect the system if the fan motor stalls. It combines an electro-proportional adjustable pilot stage and high-capacity main stage to provide precise pressure control inversely proportional to the input electrical current. The pressure setting at zero current is also manually adjustable to allow the system designer to fine tune the RPEI to their specific system requirements.

In fan drive applications, the RPEI electro-proportional inverse relief valve delivers smooth, precise changes in pressure to the fan drive motor to maintain the desired fan speed while also acting as a full flow relief valve for system safety in the event the fan motor stalls. The RPEI defaults to the maximum pressure setting to ensure the fan drive continues to cool in the event of electrical power or signal loss to the XMD driver or valve coil.

Features of the new RPEI include the following:

• 25 gpm (95 l/min) flow capacity.

• Designed and tested to 5 million on-off operational cycles.

• Exceeds new NFPA test standard T2.6.1 R2014 for fatigue and burst pressure ratings.

• Standard zinc-nickel plating for 1000 hour salt fog protection.

• Available in two nominal pressure settings: ‘A’ range manually adjustable from 60 to 210 bar; and ‘W’ range manually adjustable from 140 to 350 bar.

• Fully compatible with Sun’s XMD valve drivers for applications requiring closed-loop control.


Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Mechanical flange system
Third Quarter 2021, Parker Hannifin - Sales Company South Africa , Hydraulic systems & components
Parker Hannifin’s mechanical flange system for machines and plants − the HPF-Parker High Performance Flange System − has gained DNV GL approval for marine applications. This certifies the use of Parker’s ...

Read more...
HydraForce electro-proportional valves
Second Quarter 2021, Bearing Man Group T/A BMG , Hydraulic systems & components
BMG supplies a wide range of HydraForce electro-proportional valves, which are suitable for use in many applications in agriculture, construction, materials handling, fluid conveyance, mining and quarrying. ...

Read more...
Breathers and spin-on elements
Second Quarter 2021, Bearing Man Group T/A BMG , Hydraulic systems & components
BMG’s fluid technology filtration solutions comprise a wide range of fluid power components and systems, which are supported by the team’s broad technical capabilities to ensure fluids operate within ...

Read more...
In-field valve positioner
Second Quarter 2021, Comtest, Comtest , Hydraulic systems & components
Valves, the actuators that move them, and the electronic circuits that control them, are all subject to the effects of ageing soon after they are installed. The valve seat wears not only from the repeated ...

Read more...
Forklift products and technologies
Second Quarter 2021, Parker Hannifin - Sales Company South Africa , Hydraulic systems & components
The lift truck industry is growing not only in volume, but in sophistication. The demand for friendly interfaces, predictable performance, increased productivity, IIoT connectivity and environmental safety ...

Read more...
Proportional flow control valve
Second Quarter 2021, Axiom Hydraulics , Hydraulic systems & components
Sun Hydraulics has released the company’s first solenoid-operated, three-way proportional flow control valve as part of the expanding line of FLeX Series valves. The patent-pending, compact FREP combines ...

Read more...
High pressure hydraulic pumps
Second Quarter 2021, Axiom Hydraulics , Hydraulic systems & components
Axiom Hydraulics has the agency for the Eckerle range of high pressure hydraulic pumps. The Eckerle product line comprises gap compensated internal gear pumps for industrial, mobile and automotive markets. ...

Read more...
Land Cruiser wet brakes for mining
First Quarter 2021, Axiom Hydraulics , Editor's Choice, Hydraulic systems & components
Unfortunately, the vehicle’s OEM brakes are not built for mining; they compromise safety while suffering frequent and expensive maintenance. Simply put, the brakes were never designed for use in the highly ...

Read more...
Understanding your filtration needs
First Quarter 2021, Hydrasales , Hydraulic systems & components
Contaminants such as solid, liquid and gaseous particles are the bane of a hydraulic engineer’s life. Systems over time become less efficient and ultimately break down. This is costly. The problems are ...

Read more...
How much is a second worth?
First Quarter 2021, Honingcraft , Hydraulic systems & components
There are 86 400 seconds in a day. How much is each second worth? Honingcraft is investing in every second.

Read more...