单剪梁，不锈钢，焊接密封。
螺旋通道的端面是焊接密封的，密封性能好，结构可靠。
The end surface of spiral channel is sealed by welding, therefore the sealing performance is good with reliable structure.
合金钢材料，全部焊接密封，防油、防水、耐腐蚀，可适用于各种环境。
Alloy steel, hermetically welded, oil-proof, waterproof and anti-corrosion, suitable for all kinds of environments.
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