The valve stem becomes \"twisted\""
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It’s a new valve; there are no foreign objects in the manually operated valve core. The valve is relatively large, and the valve core has been bent, which prevents the valve from opening fully. Let’s discuss together the possible reasons for this. {:9009:}
The valve stem developing a \"twisted\" deformation is usually caused by the following factors: 1. Poor fit between the valve core and the valve seat during valve manufacturing or installation, resulting in high frictional resistance; forced manual operation that causes the valve stem to become twisted and deformed； 2. The material or strength of the valve stem is inadequate; its resistance to torsion is insufficient, resulting in permanent deformation when a large torque is applied ； 3. Design flaws in the valve, such as an overly small valve stem diameter, inappropriate material selection, or insufficient structural rigidity ； 4. There was slight seizure between the valve disc and the valve seat; it was not detected in time and the valve was forced to be opened, resulting in deformation of the valve stem ； 5. Improper use of tools during manual operation (such as extended levers) or excessive force application, resulting in a torque greater than the valve’s maximum allowable value, causes the valve stem to twist. To address this phenomenon, the specific cause can be identified by examining each of the points mentioned above. .
I’ve encountered the same situation; there’s no other good solution – just apply oil to various areas, turn it on and off several times, and it will get better gradually.
The main reason is that this valve is from a top domestic brand, it has a soft seal, and no increased torque is used.
Is the sealing material PEEK?