Construction work
Installation and construction must be careful, and avoid hitting the valve made of brittle materials.
Before installation, the valve should be inspected, the specifications and models should be checked, and any damage should be identified, especially for the valve stem. It is necessary to turn it a few times to see if it is skewed, because the valve stem is most likely to be knocked during transportation. Also remove debris from the valve.
When the valve is lifted, the rope should not be tied to the handwheel or the stem, so as not to damage these parts, it should be tied to the flange.
The pipeline to which the valve is connected must be cleaned. Compressed air can be used to blow off iron oxide chips, mud, welding slag and other debris. These debris are not only easy to scratch the sealing surface of the valve. Among them, large particles of debris (such as welding slag) can also block the small valve and make it invalid.
When installing the screw valve, the sealing packing (wire hemp plus aluminum oil or PTFE raw material tape) should be wrapped on the pipe thread. Do not get into the valve, otherwise the valve will accumulate and affect the medium circulation.
When installing the flange valve, pay attention to tighten the bolts symmetrically and evenly. The valve flange and the pipe flange must be parallel and the gap is reasonable to avoid excessive pressure or even cracking of the valve. Special attention should be paid to valves with brittle materials and low strength. Valves that must be welded to the pipe should be spot welded first, then the closing part should be fully opened, and then welded to death.
