TTF gate valve has three types of bonnet. One is bolted bonnet, which the body is connected with bonnet by bolts and sealed by spiral gasket with advantages of convenient maintenance; one is welded bonnet, which the body is fully welded with sealing bonnet of no leakage; another is pressure-in bonnet, which the body is screwed into the bonnet and sealed by inner pressure-in ring with better sealing ability for higher pressure. For the more information, please visit our website: .