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Gear pumps - Group 3 - HESPER - #4

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DOUBLE GEAR PUMPS HP 33
Note:
-At request, can be manufactured:
- double gear pumps HP 32 (HP 2 with Vg = 4...22,5 cm3/rev)
- double gear pumps HP 31 (HP 1 with Vg = 0,85...7,8cm3/rev)
- pumps with otherdisplacements
- pumps with:
a. valve with external return (to the tank)
b. valve with internal return
c. flow control valve with external return
d. flow control valve with internal return.
Not :
-La cererese potconstrui:
- pompe duble HP 32 (treapta a doua din familia HP 2 cu Vg = 4...25 cm3/rot)
- pompe duble HP 31 (treapta a doua din familia HP 1 cu Vg = 0,85...7,8 cm3/rot)
- pompe cu alte volume geometrice.
- pompe cu:
a. supap cu retur extern (la bazin)
b. supap cu retur intern
c. regulator de debit cu supap , cu debit excedentar returnat in exterior
d. regulator de debit cu supap , cu debit excedentar returnat in aspira ie.
l2
19
l1
47
17
x
x
CARACTERISTICITEHNICE - TECHNICAL CHARACTERISTICS
Vg
L
%
Presiune
Pressure
Presiune asp Inlet pressure
Tura ie - Speed
Temperatura Temperature
(°C)
Vâscozitate Viscosity
(cSt)
(cm3/rot ccm/rev)
(L1,L2) (mm)
Pn (bar)
Pmax
(bar)
Pa
(bar)
nn
(rot/min rev/min)
nmin
(rot/min rev/min)
nmax
(rot/min rev/min)
19,5
73,3
90
22,5
75,4
91
24,5
76,7
91,5
750
2800
28
79
92
180
200
-15...+80
12...2000
32,7
82,3
93
38
86
93,5
min.-0,3
1500
recomandat
recomandat
42,6
89,1
94
max. 1,5
recommended
recommended
45
90,7
94,5
0...60
25...2000
50
94
95
170
190
500
2400
56
98,2
95,5
160
180
60
101
96
150
170
63
103
96,5
140
160
Finete filtrare Filtration
(u.m)
30
Nota:
- Pn: presiunea nominala la care se garanteaza functionarea continua, durabilitatea i randamentul volumic.
- Pmax: presiunea maxima la care poate lucra pompa intermitent (max. 20 s); presiunea medie nu va depa i presiunea nominala.
- Vārfurile de presiune, de comutare, pot depa i presiunea maxima cu 10 bar.
- Randamentele volumice rrvn se garanteaza in conditii nominale i la o vāscozitate a uleiului de 30....40 mm2/s.
- Caracteristicile de mai sus sunt valabile i pentru pompele duble (la fiecare treapta in parte).
- La cerere se pot construi:
- pompe cu alte volume geometrice;
- pompe cu:
a. supapa cu retur extern (la bazin);
b. supapa cu retur intern (la aspiratia pompei);
c. regulator de debit cu supapa, cu debit excedentar returnat in exterior;
d. regulator de debit cu supapa, cu debit excedentar returnat in aspiratie.
- Pentru n>1500 rot/min, P<12 500 000 (Vg x nef)
- Functionarea pompelor la turatii ridicate, fara cavitatie, este posibila numai cu o aspiratie suficient de larga.
- Presiunea de aspiratie nu va scadea sub 0.7 bar abs.
Note:
- Pn: nominal pressure for which, continuous running, life time and volumetric efficiency are guaranted.
- Pmax: maximum pressure at which the pumps can intermittently work (max. 20 s); average pressure should be lower than Pn.
- Pressure peaks, in comutations can be 10 bar higher as Pmax.
- Volumetric efficiency r\vn is guaranted in nominal conditions and viscosity 30....40 mrrf/s.
- The characteristics mentioned above are valid also for double pumps (for every stage).
- At request, can be manufactured:
- pumps with other displacements;
- pumps with:
a. valve with external return (to the tank);
b. valve with internal return (to the inlet port);
c. flow control valve with external return;
d. flow control valve with internal return.
- For n>1500 rev/min, P<12 500 000 (Vg x nef)
- Functioning at high speed, without cavitation, it is possible only with an enough large inlet.
- The inlet pressure should not decrease under 0.7 bar absolute.
Str. C. Istrati nr.1, Sector 4, Bucure ti 7T7'1
Tel.: 021.336.23.52; 021.335.09.85; 021.335.10.50; Fax: 021.337.24.60 E-mail: hesper@pcnet.ro; www.hesper-ro.com
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