Sealing principle

The body of this valve has packing, and the seal between the valve plug and the sealing surface of the valve body is achieved by pressing the packing.

This type of valve is the use of non-lubricating oil metal seals, due to the high friction between such sealing surfaces, in order to ensure that the valve plug in the valve body can rotate freely, the permissible sealing load to be limited. Therefore, the leakage gap of the sealing surface is relatively wide, and it is estimated that this type of valve can only achieve satisfactory results when used in liquids with high surface tension and viscosity.

Photo of Marine Bronze Packed Cock