How to determine if the valve core of a gate valve has fallen off
Thread Content
Recently, there was a pipe blockage; it is preliminarily suspected that the valve core of the gate valve has fallen out. What methods can be used to verify that the valve core of the gate valve has indeed come loose? Please ask an expert to explain, thank you, bonus points
Judging from the sound, the valves also open very easily
Generally, it’s the valve stem that’s moving – adjusting it to a smaller or larger position to observe changes in flow rate and pressure. . . . . . . . . . . . . . . . .
The handle for manually operating the valve makes it easy to turn it on and off, and it’s possible to feel that there is nothing stuck in the screw rod.
If the valve stem rotates, it means it’s fallen off – it’s a straight-stem gate valve.
Surely, when the valve was opened, the valve stem moved upward but there was no flow.
Are there any other ways to determine it without looking at traffic?
The handwheel is light, and it can no longer control the flow of liquid
Just turn it on and off a few times to see if it can be fully closed; there are usually marks on the valve stem； The valve stem is very light, allowing for quick rotation ； If there are pressure gauges and flow meters, and they show no change ；
Based on the feel, it can be determined that once the valve core is removed, turning the gate valve handle will be very easy and effortless
The flow rate with the switch on doesn’t change, and it’s also easier to operate with it on