Waterproof closed doors Waterproof closed doors in the style of hard solid business foundation of hard work; commitment to honesty and conviction excellent waterproof sealed door service; spirit of hard work on creating a more efficient water-tight door performance. The company in the work of adhering waterproof closed doors: "hard solid, good faith commitment, hard work and effectiveness" principle! Perseverance, never change! Waterproof closed doors of the plate thickness 12 thick, 12 mm wells stent support, 20 mm strip compress the seal, bearing and wedge entire cast, new bearings, to ensure a solid weld in mining waterproof door door body. Waterproof closed doors working environment 1, atmospheric pressure: 80kPa ~ 110kPa; 2, ambient temperature: -30 ℃ ~ 40 ℃; 3, the average relative humidity ≤95% (25 ℃); 4, a methane and coal dust explosive mixtures coal mine; 5, not enough to corrode metal shell damage and electrical insulating gases; 6, pressure: 0 ~ 3.5MPa. Waterproof closed doors commonly known as: waterproof door mine, mine closed doors, pump house closed doors, steel watertight door. Its main purpose is to enter into the underground water suddenly caused the respective lane to prevent unnecessary losses, are major underground safety equipment, waterproof closed doors installed underground coal mine main pump house transformer room must have one of the products in our In the production strictly in accordance with the national standard drawing No. B85-373 execution to ensure the quality of the product. Intention to put waterproof closed doors and innovative in order to compete within the industry is the driving force to promote development. Also sincerely invite you to visit our factory. Phone 24 hours! Hotline: ↓