Design of pumps: volume action — vacuum.
Execution of pumps: spool-type.
Execution materials: gray cast iron and steel of usual brands. Consolidation of a shaft of the pump — manzhetny.
The pumped-over environment: the nonaggressive air, gases, vapors which are previously purified of the liquid which is contained in them and mechanical impurity.
Temperature of the pumped-over and surrounding environments — from 283 K to 308 K (from +10 °C to +35 °C).
Scope: pumps are used to suction of air, inert and nonaggressive gases and creation of vacuum in stationary installations coal, food, pulp-and-paper, chemical, etc. industries.
Application restriction: pumps are unsuitable for pumping of the hostile environment reacting with lubricant oils and ferrous metals; pumps are unsuitable for transfer of environments from one capacity in another.
Symbol: AVZ-20D, where
AVZ — the unit vacuum spool-type;
20 — speed of action, p/a;
D — two-level, i.e. consecutive action of two steps.
NVZ — the pump vacuum spool-type