The valve connected by pipe thread is connected with the pipe thread of the pipe end, wherein the internal thread can be a cylindrical pipe thread or a tapered pipe thread, and the external thread must be a tapered pipe thread.
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 prevent the pipe end from being excessively screwed in to press the inner end surface of the thread of the gate valve pipe, the valve seat will be deformed and the sealing performance will be affected.
For valves connected with pipe threads, when installing and tightening, wrench the hexagonal or octagonal part on the same end of the thread, and should not wrench the hexagonal or octagonal part on the other end of the valve to avoid deformation of the valve.
The flange of the flange connection valve and the flange of the pipe end are not only consistent with the specifications and dimensions, but also with the same nominal pressure.
When the valve stem is found to be leaking during the installation and commissioning of the stop valve and gate valve, tighten the compression nut at the packing, and pay attention to not excessive force, as long as there is no leakage.
