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Sep 26,2022

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Related Problems and Solutions of Pneumatic Ball Valve Maintenance Before Operation


What are the related problems and solutions for the maintenance of pneumatic ball valves before operation? First, check that the valve of the pneumatic ball valve is in the fully open position. After completing the grease injection operation, first check whether the diameter of the valve ball is flush with the inner cavity of the valve seat. If there is a difference, adjust the open limit bolt on the actuator to ensure that the valve Fully open, otherwise, once the valve is installed, it is impossible to judge whether the valve is in the fully open position. Next, MSTN will explain in detail the related problems and solutions about the maintenance of pneumatic ball valves before operation.

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1. Check whether the pneumatic ball valve is in the fully open position


After completing the grease injection operation, first check whether the diameter of the pneumatic operated ball valve is flush with the inner cavity of the valve seat. If there is a difference, adjust the opening limit bolt on the actuator to ensure that the valve is fully opened, otherwise, the valve cannot be installed once it is installed. Determine if the valve is in the fully open position.


2. Pneumatic ball valve cannot be injected with grease


(1) When the valve shaft (rod) is being greased, the sealing pressure in the valve shaft (rod) shall not exceed 20.68MPa. Once it exceeds, check whether the grease gun is faulty and whether the outlet valve at the grease outlet of the grease gun is open. 


(2) If there is no fault in the valve grease injection gun, check whether the grease injection nozzle is blocked, that is, slowly unscrew the grease injection nozzle and install it at the grease outlet of the grease injection gun. If there is no grease, it means that the one-way valve in the grease injection nozzle is faulty, and the grease injection nozzle should be replaced. If the grease injection nozzle can produce grease, it is necessary to check the check valve located in the grease injection hole downstream of the grease injection nozzle, and use a special tool to unscrew it for inspection. should be replaced. If it is still unable to inject grease, it should be reported to professional engineers and on-site supervision, and the factory will solve it on site.


3. The grease injection hole of pneumatic ball valve is uneven


After the valve is greased, sometimes the valve seat seal grease injection pipeline is blocked, resulting in uneven or no grease output from the valve seat grease injection hole. Observe the grease outlet hole of the valve seat, and use a soft tool to gently unblock it, and then observe the grease injection. Special attention should be paid to the fact that grease cannot be injected during the rotation of the valve ball, so as not to damage the seat seal. Under normal circumstances, the grease output of 4 grease injection nozzles on each side of the valve seat is relatively uniform, and the grease output of 2 grease injection nozzles is relatively uneven.


The above is the explanation of the relevant problems and solutions for the maintenance of pneumatic ball valves before operation. If you want to know more about pneumatic ball valves, you can pay attention to MSTN International Technologies Company!


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