Fire pump seal, is one of the key factors to measure the quality of the fire pump, so how to detect fire pump sealing? What are the requirements of seal ring inspection?
1. The surface of the auxiliary sealing ring is smooth, and shall not have defects such as bubble crack notch; End size should be uniform; Rough edges of O ring seal keeps at a 45-degree angle to working face. Once the sealing ring appears bubbles and crack, it suggests that the sealing ring is leaky. Therefore, fire pump in the daily operation, or regular inspection, once the situation occurs, immediately replace or repair.
2. The compression amount of the auxiliary sealing ring should be appropriate, too much compression, better sealing effect, but the high friction resistance makes it difficult to assemble. floating compensation ability will be poor in the operation. Otherwise, the sealing effect is poor.
3. The hardness of the auxiliary sealing ring should be selected according to the pressure, the sealing pressure and hardness should be high; Lower sealing pressure, lower hardness. In general, fire pump in the manufacturing, professional manufacturers will have a standard, according to the actual type of fire pump pressure size, to plan effectively, choose appropriate hardness such as auxiliary sealing ring generally used synthetic rubber material.
4. As for Auxiliary seal compression capacity, its other role should be considered. such as the static ring without stop pin, O ring seal of static ring plays a dual role of sealing and anti-rotating, the amount of compression of ring should be larger, in order to avoid static ring rotation from seal failure, on the premise of guarantee the sealing effect, the amount of compression should be smaller, so as to prevent large amount of compression and the resistance, cannot floating compensation.