8.4　Valve Box

8.4.1　The installation of the movable track of the mobile valve box shall be synchronized with that of the bracket of the top equipment.

8.4.2　The movable track of the valve box shall meet the following requirements:

1　The longitudinal center line shall be checked by steel ruler through drawing the wire，with the allowable deviation of 3.0mm.

2　The elevation of the top surface of the track shall be checked by level gauge，with the allowable deviation of±5mm.The height difference of two tracks in the same cross section shall be checked by level gauge，with the allowable deviation of 3mm.

3　The longitudinal levelness shall be checked by level gauge，with the allowable deviation of 1/1000.The full length shall not be larger than 10.0mm.

4　The track gauge shall be checked by steel ruler，with the allowable deviation of±3mm.The gap between the side face of the rim and the track shall be checked by the feeler gauge and shall not be less than 1.0mm.

8.4.3　The installation of the fixed valve box shall meet the following requirements:

1　The fixed valve box should be wholly lifted by the furnace top crane.

2　The joint part of the lower part of the valve box and the flange of the bellows shall be sealed by placing the filling（padding）on the flange face as stipulated in the design document and shall symmetrically fastened with the connecting bolts.

3　After the fixed valve box is installed in place，the longitudinal and transverse centerline shall be rechecked，or adjusted and centered，with the allowable deviation of 3.0mm；meanwhile，the levelness shall be adjusted and centered，with the allowable deviation of 1.0/1000.