Precautions for operating marine valves

Precautions for operating marine valves:

During the installation and debugging of marine valves, whether the operators are familiar with the operating procedures of the valves and understand the usage standards not only directly affects the service life of the valves, but also impacts on the stability and safety of the equipment and devices.

When operators operate manual valves through handwheels and handles, they should pay attention to the following points:

1. The opening direction of the valve, usually counterclockwise means the valve is open, and clockwise means the valve is closed. Therefore, pay attention to the direction when opening and closing the valve to prevent misoperation.

2. Gate valves and globe valves cannot be used for throttling, otherwise, which will easily damage the valve plate and sealing surface, and cause vibration, leakage, and damage.

3. When the closed opening gate valve and stop valve are tightened to the maximum limit, turn them 1/4 to 1/2 turns to make the threads better tight fitting to avoid over-tightening and damaging the valve parts.

4. Do not press the valve packing gland too tightly for suring that the valve stem can rotate flexibly. Too tight pressing will increase the friction of the valve stem, increase the operating torque, etc. During working, under normal circumstances, you cannot replace or add packing with pressure, otherwise, it will cause media leakage by danger.

5. When using the steam valve, it should be opened slowly to remove the condensate in the pipeline to prevent water shock and damage the valve and pipeline.

6. After some marine valves are closed, as the temperature drops, the valve parts shrink and slight leakage occurs on the sealing surface. At this time, the valve should be properly tightened once again.

7. The handle and handwheel size of the valve are designed according to the manual switch of the valve. Depending on the manpower, more comprehensive considerations should be taken into consideration when designing.

8. For marine valves that work at high temperatures, when the temperature rises above 200°C, the bolts will elongate due to heat, which may easily cause the valve to become loosely sealed. If necessary, the bolts should be "thermally jumped". When hot-tightened, the valve will not be fully tightened. Off position. This will prevent the valve stem from being stuck and making it difficult to open again.

9. In the low temperature in the season below 0 ° C, pay attention to anti-freeze for deactivated valves, open the valve bottom plug in time, and discharge the condensed water inside. For valves that cannot be eliminated and that work intermittently, measures must be taken to keep them warm so that they can continue to be used.

10. To prevent valves from being staggered, wrongly closed, missing open, or missing closed, operators must clearly understand the function of each marine valve and its position in the process pipeline to prevent misoperation, otherwise it may cause running, mixing, pressure and other accidents.