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The solutions adopted by BROEN in their gas distribution ball valves enable 100% tightness and safety. The advanced systems, e.g. FireSafe, the stem sealing and DBB (Double Block and Bleed) meet the stringest requirements of our customers.
We also equip our ball valves with additional accessories on custom order:
Double Block and Bleed
DBB system allows the bleeding of the pressure closed in the space between the ball and the body. This allows checking the tightness of valve closure without the need for shutdown. The body is depressurised by unscrewing special drain plug. It is possible to check the tightness of the closure for some types of valves irrespective of the position of the valve (closed or open).
Antistatic protection (EN 1983; API Spec. 6D)
The metal connection of the ball and the body ensures the continuous electrical conductivity preventing the dangerous accumulation of electrostatic charges on the ball.
Sealing of the stem
The sealing of the stems used in the valves depends on the operating temperatures of the valve and the working medium, for which the given valve is dedicated.
Front sealing is provided by a seal-washer made from PTFE + C, while the sealing on the stem's diameter is made depending on the operating temperature, i.e.:
- for temp. >150°C – sealing from PTFE;
In respect of the valves with fire safe protection the stem has additional sealing made from a graphite ring.
Fire safe protection (EN ISO 10497)
The fire protection comprises a set of special solutions of sealing elements based on metal and graphite materials, which during a fire of the installation allow maintaining the tightness of the valve according to the relevant standards. An outline of the solution is presented in the drawing.
The fire safe protection is an option made at the special request of the customer.
|Materials & Finishes|
|Material (?)||metal, Graphite|
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