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with 10-bar locking mechanism
At the request of partners in France, Germany and Italy in particular, Brakel has introduced a new compressed air operating system with a 10-bar locking mechanism to the market. This innovative cylinder is aesthetically pleasing, easy to maintain and extremely reliable. Furthermore, it is compliant with the EN-12101-2 standard.
Various compressed air systems
The Brakel Eura/Eura-R type louvered ventilators are available fitted with a choice of compressed air operating systems – in accordance with the provisions of the European EN12101 standard: Smoke and heat control systems.
In addition to the single-circuit PB-FS (compressed air operated failsafe closure) system and the dual circuit P2B (compressed air operated closure and opening) the single-circuit PB (compressed air operated opening) system is widely used in various European countries. These cylinder types are naturally compliant with the aforementioned EN 12101-2 standard.
Standard PB cylinder
In the event of fire, the standard PB cylinder secures the ventilator in the open position, due to the fact that the glass bulb breaks at a certain temperature (generally 68ºC). This PB cylinder is primarily fitted as part of a compressed air system comprising a compressor and pressure vessel.
New 10-bar PB cylinder
As a variation on the standard cylinder, the PB cylinder is one which can be secured in the open position by means of a 10-bar compressed air locking mechanism. Until now, this was generally achieved by fitting the – rather dated – cylinder known as the PB-DIN. These are used in combination with a control panel and central CO2 cylinder pressure system. However, the cylinder is not covered by the EN12101-2 test.
Brakel partners, based in France, Germany and Italy in particular, indicated that there is demand for a PB cylinder with a 10-bar locking mechanism which does comply with this standard. Brakel’s product development therefore proceeded to develop an innovative 10-bar PB cylinder.
Concealed springs
Other brands of PB cylinders generally available on the market are usually fitted with exterior springs. Both the old type and new PB cylinder with bar locking mechanism manufactured by Brakel, however, feature integrated (concealed) springs, which not only renders them aesthetically slim, but also more reliable and low-maintenance than cylinders with external springs.
Daily ventilation
In the case of both the standard PB cylinder and the new PB-10 cylinder, a standard operating pressure of 6 bar supplied by the compressor ensures that the louvers of the Eura/Eura-R open to provide daily ventilation.
Test procedure
The Brakel PB-10 bar cylinder is currently being tested according to the EN12101-2 procedure, which prescribes the following loads:
- snow load 500 N/m²
- wind load 1500 N/m²
- durability test Re 1000 (= 10,000 x natural ventilation +
1000 x fire cycles).
We expect to be awarded the certificate in June 2010.
Characteristics of the 10-bar locking cylinder
Brakel’s new 10-bar locking cylinder features the following characteristics:
- applicable with Eura/Eura-R types 60-3 to 240-13
inclusive
- single-circuit system
- natural ventilation by means of 6 bar operating pressure
- fire ventilation by means of 10 bar (CO2) pressure,
causing cylinder to lock in open position in event of fire
- always locked in closed position
- can be conveniently reset using 6-bar cylinder after fire
(or fire simulation)
- concealed spring. |
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