Our designers had to design google valves to meet strict conditions which are in the blast furnace in Linz. We acquired a contract for the supply of these metallurgical valves last year. The goggle valves have already integrated into the blast furnace for DN 1800 and DN 800.

The working medium is an aggressive blast furnace gas having a temperature of 80°C and a maximum pressure of 0.25 bar. The customer demanded to make a special inner coating of higher strength to withstand this aggressive media. Moreover, all the parts that could not be painted with this special paint had to be made of stainless steel.

Both google valves are operated by a special hydropower system, which is divided into two circuits. One circuit is in operation, and the other is a reserve in the case of a functional circuit failure. The hydraulic cylinders are connected to the central hydraulics. The sealing plate can be moved using a gear, chain wheel and chain manually.

Designing of documentation for google valve is always very challenging and takes a long time. The larger google valve DN 1800 was a real giant. The valve weighs over than 12 tons, is nearly four meters high, and including the console for removing the cover reaches a length of 9.3 meters! Such a valve is difficult not only to draw but also to manufacture and manipulate with it. When we count all the parts from which the goggle valve DN 1800 is made, we get 3394 pieces.