Dosing plunger pumps and units are designed for volumetric pressure dosing of neutral and aggressive liquids, emulsions and suspensions with a density of not more than 1300 kg/m3, with kinematic viscosity fr om 8.5x10-7 to 8x10-4 m2/s (from 0.0085 to 8 St), with a temperature from -15 ºС to +150 ºС, with a solid non-abrasive phase concentration of not more than 10% by weight with a maximum particle density of up to 2000 kg / m3, with a grain size of the solid non-abrasive phase not more than 1% of the nominal diameter of the inlet pipe.
The ND unit consists of a drive and a pump. An electric motor and a geared motor can act as a drive. The pump consists of a single or double movement mechanism and a corresponding number of hydraulic cylinders. The movement mechanism includes a built-in worm gear, a crank mechanism for converting rotational motion into reciprocating motion, and a plunger stroke length adjustment mechanism. The worm gear may be absent (for pumps driven by the balancer of the pumping unit). The hydraulic cylinder consists of a housing, a plunger with a seal, ball valves and connecting pipes.
Implement designation example 2ND 800/63 D14B, wh ere:
2 - the number of plungers (single-plunger - not indicated; 2 - double-plunger);
ND - purpose and design differences:
ND - dosing pump without a heating (cooling) jacket,
NDR - dosing pump with adjustment on the go;
800 - supply, l / h;
63 - pressure at the outlet of the pump, kgf / cm²;
D - execution according to the material of the flow part (steel 20X13 (AISI 420) - D, steel 12X18H10T (AISI 321) - K);
1 - execution according to the type of plunger seal (chevron cuffs - 1, gland packing - 2);
4 - execution according to the design of the plunger seal (without a supply of cooling, sealing or flushing liquid - 3; with a supply of cooling, barrier or flushing liquid - 4);
B - execution according to the degree of explosion protection of the electric motor (general industrial - A, explosion-proof - B).
