Butterfly valve pipeline installation instructions

1. The valve can be installed on the flange only after the flange is welded to the pipeline and cooled to the ambient temperature. Otherwise, the high temperature generated by welding will affect the performance of the elastic seat.

2. The edge of the welding flange must be machined with a lathe until the surface is smooth, so as to avoid damaging the elastic seat during valve installation. The flange surface must be completely free from damage and deformation. All dirt, dust and foreign matters must be removed to avoid liquid leakage at the valve and flange interface.

3. Clean the flange and the inner cavity of the pipe to completely remove the spatter, peeling scale and other foreign matters left by welding.

4. When installing pipes between valves, accurate alignment of the center of the upper and lower water pipes is very important for trouble free operation. The inaccurate center points shown in Figure 1 must be avoided.

5. When installing the valve, set the positioning bolts under the pipeline at the same height to support, and adjust the distance between flanges until the distance between two sides of the valve body is about 6-10mm. Remember that the valve can only be opened from the closed position to the 10 ° position.

6. Insert the two bolts into the lower guide rod of the valve, and then install them carefully so that the flange surface will not damage the elastic seat. (see Figure 2)

7. Then place the other two bolts into the guide rod above the valve to ensure accurate centering between the pipe and the valve.

8. Open the valve three times to check whether there is poor contact between the valve plate and the flange.

9. Remove the locating bolts, place all bolts around the valve body and tighten them alternately diagonally (see Fig. 3 and Fig. 4) until the flange touches the valve body. Refer to the following table for recommended torque values.

10. When installing the actuator, provide a support for the valve to avoid the distortion of the valve neck and reduce the friction between the valve and the pipeline.

11. Do not step on the valve neck or valve handwheel.

12. Do not install DN350 or larger valves upside down.

13. Do not directly install the butterfly valve on the check valve or pump, which may cause damage when contacting the valve plate.

14. Do not install the valve on the downstream side of the elbow and reducer, or calibrate the valve when the flow rate changes. In this case, it is recommended to install the valve at a distance of about 10 times the nominal diameter of the valve.

15. When installing the valve, it is necessary to consider which valve plate will be subjected to flow rate and pressure during liquid delivery