Description
All the rubber-lined butterfly valves are of high reliability, and robust design in accordance with the worst prevailing ambient conditions.
Ebonite lining: has good chemical stability, excellent chemical corrosion resistance and organic solvent resistance, low water absorption, high tensile strength excellent electrical insulation, etc. features.
All the rubber-lined butterfly valves are of high reliability, and robust design in accordance to the worst prevailing ambient conditions.
Ebonite lining: has good chemical stability, excellent chemical corrosion resistance, organic solvent resistance, low water absorption, high tensile strength excellent electrical insulation, etc. features.
The ebonite lining forms a continuous covering layer on the substrate adding the special design and process of the joint to completely isolate the ferrous substrate from the service medium, thus ensuring the product’s long service time. For the corrosive service fluid, it will be a much more cost-effective solution.
The area to be protected by ebonite lining shall be sand blasted to expose the metal white and reach cleanliness Sa 2.5 to ISO 8501 and roughness medium G to ISO 8503.
Under an environment with humidity not exceeding 60% and temperature of 15-40 ℃, use the necessary lining tools such as a pressure roller and scraper to completely compact the rubber sheet and the substrate according to the strict process procedures and requirements.
The ebonite lining vulcanization is processed with hot air or steam in the vulcanization kettle.
The subsequent process can only be started after passing various tests and inspections (visual inspection, electric spark detection to holidays/pinholes/cracks, adhesion test hardness test, etc.)
The hardness range shall achieve Shore D 75±5
External corrosion protection: the following painting system is provided to suit the application of the C5 corrosivity category according to EN ISO 12944-2,
Epoxy zinc-rich primer – 60μm, Epoxy micaceous iron/ intermediate paint – 120μm, Acrylic polyurethane finish paint – 60μm, Total dry fill thickness(DFT) 240μm
Epoxy glass flake primer- 80μm, Epoxy glass flake paint two layer – 160μm, Total dry fill thickness(DFT) 240μm
All the internal and external fastenings such as nuts, bolts, screws, and fittings shall be of stainless steel grade 316L or duplex stainless steel
All the rubber-lined butterfly valves are suitable to be fixed in a vertical position or horizontal position.
The lifting eye/lifting hook is fixed in a suitable position so that the valve can be lifted in a vertical or horizontal position.
Specifications
|
Name |
Material |
|
Body |
GJS500-7/ GJS400-15/ WCB+ rubber lining |
|
Disc |
GJS500-7/ GJS400-15/ WCB+ rubber lining |
|
Shaft |
SS420/SS431/Duplex 1.4462 |
|
Disc seal ring |
EPDM |
|
Retainer ring |
Carbon steel +epoxy/ SS304/ SS316 |
|
Shaft bearing |
AL-bronze |
|
O ring |
EPDM |
|
Pin |
SS420 |
|
Key |
SS420 |
|
Packing gland |
Carbon steel +epoxy |
|
Connection flange |
Carbon steel +epoxy |
|
End cover |
Carbon steel +epoxy |
