For stainless steel gate valves, the valve is disconnected from the valve stem and the spool due to corrosion, wear or improper operation during opening and closing. After the valve is closed, it cannot be opened. It can only be replaced after it is cut out from the system. If it cannot be cut out from the system, only another process or device will be shut down.
When the stainless steel gate valve spool is detached and cannot be cut out, the valve cover, the valve stem, the bushing and the packing can be changed without changing the valve body, the valve core and the valve seat while the sealed medium is sealed. After the gland is assembled, the valve core is exposed, and the valve stem is reconnected to the valve core by a conventional method, so that the three seals of the valve can be continuously maintained and the valve can be reopened. After the valve cover of the stainless steel gate valve is disassembled, except for the special valve, the wedge angle of the valve spool is in the friction angle range. No matter how the pressure on both ends of the valve core changes, the valve core will not be squeezed out from the valve seat under the self-locking condition. For flat valve spools, there is no more extrusion.