Electric ball valve is a hollow valve product used for flexible connection between metal pipes. Electric ball valve is also called valve pipe electric ball valve, flexible electric ball valve, valve electric ball valve, flexible electric ball valve, high pressure electric ball valve, valve shock absorber, etc. It is a pipe joint with high elasticity, high air tightness, medium resistance and weather resistance. This product takes advantage of the elasticity, high air tightness, medium resistance, weather resistance and radiation resistance of the valve. It is made of polyester cord fabric with high strength and strong cold and hot stability, which is compounded diagonally with it, and then vulcanized by high-pressure and high-temperature molds. It is widely used in various pipeline systems. Classified according to the external form: single ball electric ball valve, double ball electric ball valve, three ball electric ball valve, concentric reducing electric ball valve, eccentric reducing electric ball valve, clamp type electric ball valve, 90 ° valve elbow, etc. Classification according to the medium used: general (ordinary) electric ball valve, high temperature resistant electric ball valve, acid and alkali resistant electric ball valve, wear-resistant electric ball valve, desulfurization special electric ball valve, etc. Classification according to working pressure: 0.25Mpa, 0.6Mpa, 1.0Mpa, 1.6Mpa, 2.5Mpa, 4.0Mpa.
Sealing requirements: 1. When the upstream surface is a corrosive medium, the gap can be sealed with sealing materials. See the waterproof casing atlas for the practice; Installation drawing of flexible waterproof sleeve (Type A).
2. Filler materials of flexible waterproof casing: asphalt hemp fiber, polystyrene board, PVC foam plastic board.
3. Sealing paste: polysulfide sealing paste, polyurethane sealing paste.
4. The dimensional tolerance and geometric tolerance of welding structure shall comply with JB/T5000.3-1998. Manual arc welding is adopted for welding, and the welding rod model is E4303, and the brand is J422. The basic shape and size of weld groove shall comply with GB985-88. 5. When flexible waterproof casing is rolled, the allowable deviation of perimeter is D2 ≤ 600, D2>600 ± 0.0035D2. 6. The thickness of the concrete wall where the wall passes through shall not be less than 300, otherwise the wall shall be thickened on one side or both sides, and the diameter of the thickened part shall be at least D5+200.
7. The weight of flexible waterproof casing shall be calculated with L=300. If the wall thickness is greater than 300, it shall be calculated separately.
8. If a non concrete wall is encountered at the place where the flexible waterproof casing passes through the wall, the concrete wall shall be used locally, and the pouring range shall be 200 larger than the diameter of the wing ring (D5). Moreover, the casing must be poured at one time on the inner wall for good sealing effect, because the duckbill valve realizes self tightening sealing in the pipeline connection through the elasticity of the valve sealing ring, The constant stress on the valve sealing ring forms another double sealing system with the external sealing ring carrier, forming a perfect triple sealing effect. The reliability of the outer card sealing ring and the sealing ring is the main part that directly affects the sealing performance of the product. Therefore, when Jintong Pipeline processes the cover sealing parts, it selects a high-precision lathe and a one-time forming valve sealing ring mold, forming a perfect sealing effect.