HN Nexa Series0 pages

| SEKO S.p.A.
HN0
316L
DOSING PUMP
nexa SERIES-Hydraulic Double Diaphragm
Technical data can be changed without notice.
TD_HN0_SS_rev.2.2
1 of 4
nexa series includes plunger and hydraulic diaphragm dosing pumps designed in compliance with API 675
Standards; the conformity to the API Standards implies a “heavy duty” design, high safety and severe controls of the
performances during the tests. The broad variety of heads execution offers a wide selection of dosing pumps to
cover practically any application needs. In addition the full compliance with the ATEX European Directive gives the
possibility to install these pumps in classified areas too.
Mechanism
Available in different sizes, they are mechanical return type, giving the maximum reliability in all working conditions.
General Specifications:
„h Low noise integral gearbox, worm type, oil bath lubricated
„h Reduced energy consumption based on low friction rolling bearings design
„h High flexibility multiple mechanism solution to permit different piston speeds (SPM) on the same group
„h Micrometric stroke lenght adjustment both manually and/or automatically actuated.
„h Automatic stroke length variation by electrical servomotor, pneumatic actuator or frequency converter
„h Linearity and repeatability in compliance with API 675 Standards.
„h Easy “on field” installation of electrical servomotor on manual stroke adjustment mechanism.
Diaphragm Pumphead
„h High capacity flexibility„³ On site easy volume changing by changing the piston cartridge
„h Easy to change spares parts (all “one cartridge” solution).
„h Maximum compatibility PTFE diaphragm
„h Visual or remote diaphragm failure detection
Technical characteristics
„h Flow rates: from 0,06 to 5,17 lph @ 50 Hz
„h Max Pressure: 200 bar
„h Ambient temperature: -10 °C + 40 °C
„h Max altitude: 1000 m (A.S.L.)
„h Fluid operating temperature: -10 °C + 70 °C
„h Viscosity up to 1000 cP (Higher on request)
„h Stroke adjustment during operation from 0 to 100%
„h Accuracy ± 1 % on the turndown ratio 10:1
„h Built-in overpressure valve
„h Min NPSHr: 3 mwc „³ High suction capability
„h Double diaphragm and diagnostic of the rupture
„h Diaphragm duration up to 20.000 hours, depending of
the application
„h Multiheads (up to six) solutions
„h API 675 compliance
„h CE marking
„h ATEX II 2 G c IIB T4 compliance
„h Protection: IP 55
„h Epoxy painting at 125 micron