- It is strictly prohibited to dismantle and disassemble the expansion flange butterfly valve at will on the pipeline construction site; it is strictly prohibited to repeatedly lengthen and shorten the expansion butterfly valve at will on the site.
- The pipes at both ends of the expansion valve shall be concentric, and the two flange surfaces on the pipes shall be parallel;
- The flange fixing bolts shall be tightened symmetrically, and do not force to tighten the flange fixing bolts unilaterally;
- The expansion pipe is installed behind the valve;
- The expansion part of the expansion valve shall not be installed at the pipe corner or at the end of the pipe.
- The expansion flange butterfly valve must be placed horizontally before installation, do not bump at will;
- The structural length of the expansion flange butterfly valve is the minimum length when leaving the factory. When installing, pull it to the installation length (i.e. design length);
- When the length between the pipes exceeds the installation length of the expansion butterfly valve, please adjust the pipe spacing, and do not forcibly pull the expansion valve to avoid damaging the expansion valve;
- The expansion flange butterfly valve can be installed at any position. When it is used for temperature compensation, after the pipeline is installed, support shall be added at both ends along the axis of the pipeline to prevent the expansion pipe of the expansion valve from pulling out. The support force of the support shall be calculated according to the following formula. It is strictly prohibited to remove the support during operation;
- When the expansion flange butterfly valve is only used for installation, replacement and maintenance without temperature compensation, it can be limited by bolts and clamped symmetrically to prevent the expansion pipe from pulling out and damaging the expansion butterfly valve, pipeline device or building. The bolt diameter can be calculated according to the flange bolt diameter, its bolt strength, bearing test pressure and pipeline tension according to the above formula. It is strictly prohibited to remove the bolts in the operation time limit position (bolts shall be provided separately).
Jan122020
