Positive displacement reciprocating multiplex plunger pumps with a fixed stroke are specifically designed for extremely high-pressure applications and full comply with the API 674 standard. They are suitable to transfer a wide range of fluids with viscosity up to 100 cst, solid contents up to 100 μm, but without vapour.
Reciprocating plunger pumps have packing type sealing to provide a seal between the plunger and sleeves. In order to ensure proper lubrication of the seal packing, a very small fluid leak is necessary. This leakage, which consists of few drops, is collected. In some applications, a collection system is available as an option to enable the recirculation of the packing leakage into the pump suction system.
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