Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 128 of 165 TD/TAD4 Manual Rev 4
12.3 Unibloc
12.3.1 Unibloc General Arrangements
All Unibloc gas trains are manufactured and tested in accordance with EN 161 : 1991 'Automatic
Shut-off Valves for Gas Burners and Gas Appliances'
The Unibloc body is cast iron to BS 1452 grade 220 (the 100 N.B. body conforming to EN161 is
S.G. cast iron to BS 2789 grade 2712). All bodies are manufactured in one piece and are precision
machined to accept the various gas valve actuators that are described in section 2.
The standard unit is designed for use with 2nd and 3rd family gases and is fitted with plated carbon
steel valve seating rings. For other gas applications, e.g. bio or producer gas, the valve seating rings
are manufactured out of grade 321 stainless steel, because of the corrosive nature of these gases.
Where hydrogen sulphide (H2 S) is present in the gas advice must be sought from Dunphy
Technical Department.
A gas filter is fitted around the seating of the first stage valve to prevent foreign bodies entering the
Unibloc and causing valve seating problems. Gas filters are available to suit the various
specifications as required.
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