1. The valve connected by pipe thread is connected with the pipe thread of the pipe end. The internal thread can be a cylindrical pipe thread or a tapered pipe thread, and the external thread must be a tapered pipe thread.
2. The gate valve with internal thread connection is connected to the pipe end, and the length of the external thread of the pipe end needs to be controlled. In order to avoid excessive screwing in the pipe end to press the inner end surface of the pipe thread of the gate valve, the valve seat is deformed and the sealing performance is affected.
3. For valves connected with pipe thread, when installing and tightening, the hexagonal or octagonal part of the same end of the thread should be wrenched, and the hexagonal or octagonal part of the other end of the valve should not be wrenched to avoid deformation of the valve.
4. The flange of the flange connection valve and the flange of the pipe end are not only consistent with the specifications, but also with the same nominal pressure.
5. When the valve stem is found to be leaking during the installation and commissioning of the shut-off valve and gate valve, tighten the compression nut at the packing, and pay attention to not excessive force, so as not to leak water.
