The strength of throat band meets the requirements. 2. Negative pressure sealing 0.08MPa, 1. Compressive strength at 4.2MPa. Negative pressure remains unchanged for 30 minutes. 3. Air leakage rate ≤ 0.5 10-4MPa/S 4. Angle range ≤ 3.5 ° f = 35mm 5. Maximum pipe end clearance 6mm 6. According to GB8259 8260 8261-87 urban construction industry standard of the Ministry of Construction and American standard UL213-93 production. 7.GB50084-2001 Code for Design of automatic Sprinkler System proposes the use of groove type throat hoop connection.

Mechanical pipe fittings connected by bolts to branch pipe, mechanical tee, four is an innovation in the pipe connection system. The branch pipe is connected directly from the main pipe without welding. The way is to drill a round hole on the main head of the branch pipe. The factory is equipped with a hole punching machine to assemble the ring branch pipe joint, and has a smooth outlet surface to ensure the maximum flow rate, and reduce the local resistance of the pipeline, with the washer. Our factory also supplies four mechanical passes.

In order to ensure the mechanical strength of the pipe, mechanical tee. The drilling size is recommended to be less than the pipe diameter size of 1/2 mechanical four, punching size is less than the pipe diameter of 2/5 of the mechanical tee or four can be used equal diameter reducing tee or four plus clamp replacement.

In conjunction with fittings, all grooved pipe fittings. All of them have been made into the standard groove shape in the factory, which can be matched with the corresponding pipes and joints when purchased, so as to achieve the best installation speed and installation effect.