China Drying Network News The anti-dumping bureau of Ministry of Commerce and Industry of India informed the Ministry of Commerce of the People's Republic of China in India on the 20th that it has received domestic industry requirements for 4,4'-diaminostilbene-2,2' from China. - The disulfonic acid product [4,4' Diamino Stilbene 2,2' Di Sulfonic Acid (DASDA)] initiated an anti-dumping investigation and it is expected that the investigation will be formally initiated soon.

Tongue And Groove Face Flanges

The Tongue and Groove faces of this flanges must be matched. One flange face has a raised ring (Tongue) machined onto the flange face while the mating flange has a matching depression (Groove) machined into it's face.

Tongue-and-groove facings are standardized in both large and small types. They differ from male-and-female in that the inside diameters of the tongue-and-groove do not extend into the flange base, thus retaining the gasket on its inner and outer diameter. These are commonly found on pump covers and Valve Bonnets.

Tongue-and-groove joints also have an advantage in that they are self-aligning and act as a reservoir for the adhesive. The scarf joint keeps the axis of loading in line with the joint and does not require a major machining operation.

General flange faces such as the RTJ, TandG and the FandM shall never be bolted together. The reason for this is that the contact surfaces do not match and there is no gasket that has one type on one side and another type on the other side.

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