Welch Industrial Vacuum Pumps and Systems - Specifications
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DUOSEAL Belt Drive High Vacuum
Two-Stage Vacuum Pumps
Single-Stage
Welch Model
1400
1405
1402
1376
1397
1374
1399
1380
Free Air Displacement, (CFM) (L/min)
0.9
25
3.2
90.6
5.6
160
10.6
(300)
17.7
(500)
23
(650)
1.2
35
5.6
160
Ultimate Pressure, Torr
1. x 10 -4
1. x 10 -4
1. x 10 -4
1. x 10 -4
1. x 10 -4
1. x 10 -4
.5 x 10 -2
1.5 x 10 -2
Gas Ballast
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Pump RPM
580
525
525
525
400
510
750
535
Motor HP
1/3
1/2
1/2
1
1
1 1/2
1/3
1/2
Oil Capacity, qts
0.62
2.25
2.25
2.5
1.25
1.25
0.5
3.7
Tubing Needed, I.D. in.
7/16
7/16
13/16
13/16
1-5/8
1-5/8
7/16
13/16
Intake, Thread Type
3/4-20
1-20
1-20
1-20
1.75-20
1.75-20
3/4-20
1-20
Exhaust, Thread Type
3/4-20
1.20
1.20
1.20
1.75-20
1.75-20
3/4-20
1-20
Dimensions, L in.
W in.
H in.
17.8
9
12.6
20
12
15
20
12
15
20
14.1
15.4
26
13.7
18.8
26
13.7
18.8
17
9
10
20
12
15
Weight, lbs.
68
128
128
177
224
231
51
91
*Two-Stage pumps should not be operated continuously at pressures above 10 Torr *Exhaust connection is a 2 1/2 in. square opening with tapped holes for mounting bolts. Model 1375 includes 1417M exhauset filter. Single phase pumps 1 h.p. and below come with line cord. Above 1 h.p. conduit wiring required.


Directorr Direct Drive High Vacuum
Welch Model
8890
8905
8907
8912
8917
8920
8925
Free Air Displacement (CFM) (L/min) @60 Hz
CFM (L/min) @ 50 Hz

1.1 (31)
0.9 (26)

1.8 (51)
1.5 (43)

2.6 (70)
2.2 (63)

3.8 (108)
3.2 (91)

6.1 (173)
5.2 (148)

7.7 (218)
6.4 (181)

11.3 (320)
9.3 (263)
Ultimate Pressure (Torr)2
1 x 10 -4
2 x 10 -3
1 x 10 -4
1 x 10 -4
1 x 10 -4
3 x 10 -4
4 x 10 -4
Sound Level, dBA
58
52
52
52
52
54
55
Motor/Pump Speed (60 Hz)
3450
3450
1725
1725
1725
1725
1725
Motor Horsepower
1/4
1/4
1/2
1/2
1/2
1/2
3/4
Oil Capacity, qt. (liters)
.44 (.42)
.40 (.37)
.53 (.50)
.53 (.50)
.63 (.60)
1.11 (1.05)
1.16 (1.10)
Tubing Needed, I.D. in.
3/8
7/16
13/16
13/16
13/16
13/16
13/16
Intake Connection
3/8 in. Hose Barb
3/16 and 7/16 in. Hose Barb
7/16 and 13/16 in. Hose Barb
7/16 and 13/16 in. Hose Barb
7/16 and 13/16 in. Hose Barb
9/16 and 13/16 in. Hose Barb
9/16 and 13/16 in. Hose Barb
Exhaust Connection
Threaded 3/4 -20
Threaded 3/4 -20
Threaded 1 -20
Threaded 1 -20
Threaded 1 -20
Threaded 1 -20
Threaded 1 -20
Weight, lbs (kg)
24.5 (11.1)
24.5 (11.1)
37 (16.8)
40 (18)
57 (26)
58.5 (26.6)
69 (31.3)
Dimensions,
L in. (cm)
W in. (cm)
H in. (cm)
14.5 (36.8)
5.1 (13)
8.4 (21.3)
<
14.1 (35.9)
5.1 (13)
8.4 (21.3)

16.7 (380)
9.7 (165)
6.5 (240)

16.7 (380)
9.7 (165)
6.5 (240)

18.4 (420)
9.7 (165)
6.5 (240)

20.5 (52.1)
7.1 (17.9)
10.7 (27.2)

21.2 (53.8)
7.1 (17.9)
10.7 (27.2)
Ship Weight, lbs. (kg)
26 (11.8)
26 (11.8)
42 (19)
52 (236)
65 (29.5)
68 (30.8)
77 (34.6)
Shipping Carton Dimensions
21 x 6.5 x 11.25
21 x 6.5 x 11.25
28.9 x 10.7 x 13.6
28.9 x 10.7 x 13.6
28.9 x 10.7 x 13.6
29 x 11.5 x 15.5
29 x 11.5 x 15.5
x W x H in. (cm)
(53.3 x 16.5 x 28.6)
(53.3 x 16.5 x 28.6)
(740 x 258 x 350)
(740 x 258 x 350)
(740 x 258 x 350)
(73.7 x 29.2 x 39.4 )
(73.7 x 29.2 x 39.4 )
*Two-Stage pumps should not be operated continuously at pressures above 10 Torr

*Exhaust connection is a 2 1/2 in. square opening with tapped holes for mounting bolts. Model 1375 includes 1417M exhauset filter.
Single phase pumps 1 h.p. and below come with line cord. Above 1 h.p. conduit wiring required.



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