What causes the stem to be stuck?
Many reasons, stem, valve shaft assembly size is not right, or packing with too tight can cause, stem finish is not enough, can produce
1. is the pressure plate, the root screw is too tight, you can loosen the screw, you can add a lubricant in the packing and stem connection.2. may be too tight packing, but there may be stem rust.Of course, the most important question is what you operate is the valve? Different types of valves are available for various reasons.
The key is the gap between the valve stem and the sleeve, especially when the temperature is too high, easily blocked; it also includes the stem shaft end clearance, valve plate and valve body clearance, valve stem sleeve lubrication, stem wear serious.
