The packer and telescopic tube are designed to a whole body and V-shaped inflatable graphite sealing ring is used to form the sealing system, ensuring the sealing performance of.
The carbon graphite material prepared by the means of improving the oxidation resistance of the basic body materials and impregnated with phosphates had better oxidation resistance.
According to the maximum pressure to bear, pump body and cover can be made of grey cast iron (1.6mpa), spheroidal graphite cast iron (2.0mpa) or cast steel (2.5mpa, including stainless steel).