Product category:
Hydraulic Components
News Release from: Nordhydraulic | Subject: RSQ 240 mobile valve
Edited by the Engineeringtalk Editorial
Team on 08 January 2002
Valve adds new features to mobile
equipment
Nordhydraulic's RSQ 240 is a valve which creates possibilities for more efficient use of cranes and shows that the well-proven spool type mobile valve still has potential for further development
Nordhydraulic's RSQ 240 is a mobile valve which adds new features to mobile equipment The maximum capacity of a crane in metric tonnes depends on the maximum speed of the various functions
If the maximum speed is reduced, the maximum permitted payload can be increased due to less dynamic forces.
Also, in certain critical operations, the option to reduce maximum speed and to control a movement in a very precise way is very valuable.
These features can be realised using the RSQ 240 valve.
In one way, it is a conventional open centre directional valve but with a new unique patented design which offers two preset maximum flow levels.
The ingenious design concept is such that, even in the low flow mode, the whole spool stroke is used to achieve good metering characteristics.
The RSQ 240 valve actually consists of two valves, optimised for two different flow rates, incorporated into one.
The RSQ 240 valve is a sectional parallel circuit directional control valve.
It is available in a large number of versions to allow the machine designer to create the hydraulic system he really needs in order to make his product competitive.
The valve is designed for a maximum system pressure of 350 bar and a pump flow of 100 l/min.
The valve can be used in combination with both fixed and variable displacement pumps.
For example a system using a 'load-sensing' variable displacement pump, the soft working properties of an open centre valve system are combined with the energy-saving features using a variable pump.
The maximum number of spool sections per valve assembly is ten.
High pressure carry-over is a standard option.
Each working section is fitted with load check valves in both low and high flow inlet passages.
A wide choice of spools for different system solutions as well as various types of service port valves and different types of inlet and outlet sections are available.
Based on customer specifications, the notches in the metering lands for both high and low flow are optimised to obtain the best possible control of the flow for the operator.
The RSQ 240 can be lever operated or it can be supplied with electrohydraulic or electrohydraulic proportional control with internal pilot oil supply.
The valve is a very compact one.
The lever can be mounted on either side of the spool.
LH and RH side inlet configurations are available as standard.
The installation dimensions as well as the symmetrical design are such that they allow the machine designer to incorporate the valve into his machine in the optimal way.
The RSQ 240 was officially launched on the market during the Scanautomatic Fair in Stockholm in November 1997.
It was awarded the prize for the best component.
The reasons given by the jury were: * A simple and brilliant design and therefore reliable.
* Patented concept at a high level of innovation.
* Shows that the well-proven spool type mobile valve still has potential for further development.
* Creates possibilities for more efficient use of cranes and other types of handling equipment.
In addition to cranes, there are many other applications where the features of the valve are of great interest.
Examples include backhoe loaders, smaller excavators used for precision work, telescopic load handlers, towing cars and forklift trucks.
In all this equipment, the low flow operating mode with excellent control characteristics improves performance.
The reception of the valve on the market has been very good.
To date, the valve has been installed in a number of prototype mobile machines.
Bulk deliveries are already being made to a major manufacturer of truck-mounted cranes in Europe.
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