METERING PUMP Russian patent published in 2008 - IPC F04B13/00 

FIELD: engines and pumps.

SUBSTANCE: proposed device is designed to be used for metering toxic, aggressive, explosive and inflammable fluids in minor amounts. The proposed pump comprises the main housing with the valves and a flexible casing, a thrust ring and helical spring with a retainer. The flexible casing is arranged outside the main housing and fastened thereon to make a common working chamber. The cylindrical flexible casing side surface features an annular groove accommodating the aforesaid thrust ring. The said flexible casing base is fastened to the retainer of the spring enveloping this casing.

EFFECT: simpler design, higher reliability and accuracy of metering fluids in minor amounts.

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