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Mixers
Piping filter
Auto washing filter
Air Filter
Filter cartridge series
Polishing filter
Powder transferring equipment
Powder mixing equipment
Liquor material stirring equipment
Silencer
Special compact equipment
High-efficiency heat exchanger
Steam-injection vacuum pump
Water-injection type loading and unloading wagon
Structured packing
Service Hotline:0513-83351077 Tel:0513-833519400513-83841007
Fax:0513-83351087
Sight glass
Performance features
Sight glass is often used as a main accessory in piping systems of industries such as petroleum industries, chemical, medicine and foodstuff production and paper making industries, to observe medium flow and reactions such as liquid, gas and steaming vapor for the purpose of monitoring production process and preventing accidents.
Denotation of product types
Illustration of denotation
Select a single pressure flange-connected sight glass with swing-plate internal structure, nominal pressure of flange 0.6 Mpa, nominal diameter 80mm and low carbon steel main body material as an example, the denotation symbol is SG-II-P-0.6-80/C.
Table 1
Type
Clamping type
Single pressure type
Thread type
Tubular type
Floating ball type
frame type (Clamping type)
Frame type (single pressure type)
Pressure container type
others
Connecting modes
Flange
Flange
Screw
Flange
Screw
Flange
Flange
Flange
Without neck
With neck
Flange
code
I
II
III
V
Va
Vb
VI
VII
VIIa
VIIb
Ixa,b
Table 2
Structures
Straight necking type
Necking down type
Inclined necking type
Impeller type
Swing plate type
Floating-ball type
Code
A
B
C
D
P
E
Note: Connecting modes in the table mainly refer to I. II, and III.
Product specifications and technical parameters
(1) SG-I Clamping type sight glass
DN
Window diameter W
Pipe inradium D
H
L
Application case
PN≤1.6
PN≤2.5
8
58
40
75
140
160
PN≤2.5Mpa
Working pressure≤1.0MPa
Working temperature :0-180℃
10
58
40
75
140
160
15
58
40
75
140
160
20
68
50
85
160
180
25
68
50
85
160
180
40
78
60
115
180
200
(2)SG-II Single-pressure sight glass
DN
Window diameter W
Pipe inradium D
PN0.6
PN1.0、PN1.6
PN2.5
H
L
H
L
H
L
50
80/80
65/50
200
220
200
220/250
210
250/270
65
102/100
80/102
230
250
230
250/270
240
270/320
80
102/100
102/102
245
270
245
270/270
270
320/380
100
125/125
125/125
330
320
330
320/320
360
360/420
125
150/150
150/150
340
360
360
370/400
400
410/480
150
200/200
200/200
350
420
420
430/440
440
480/550
Note: Sight glass above / in the figure is swing plate glass with working pressure<1.0 MPa; working temperature<0-180OC
(3)SG-III Full threaded sight glass
DN
Window diameter W
ScrewM
H
L
Application case
PN≤1.6
PN≤2.5
6
58
G1/4
75
140
160
PN≤2.5 Mpa
Working pressure≤1.0MPa
Working temperature: 0-180℃
10
58
G3/8
75
140
160
15
58
G1/2
75
140
160
20
68
G3/4
85
160
180
25
68
G1”
85
160
180
40
78
G1½”
115
180
200
(4)SG-IV Tubular sight glass
DN
PN
H
H1
H2
Glass tube diameter
Diameter
Thickness
20
1.0
250
78
94
ф50
4
25
1.0
250
78
94
ф50
4
40
1.0
250
78
94
ф60
5
50
1.0
250
78
94
ф78
5
65
1.0
250
78
94
ф90
5
(5)SG-Va thread-connection and float-ball sight glass
DN
d
D1
D
L
H
Ballф
Drawing no.
20
16
G3/4”
38
120
70
18
HGS0-128-01-1~4
25
16
G1”
40
120
70
18
HGS0-128-01-1~4
32
16
G1¼”
50
124
76
18
HGS0-128-01-1~4
40
16
G1½”
56
124
80
18
HGS0-128-01-1~4
50
16
G2”
66
124
85
18
HGS0-128-01-1~4
Notes: PN≤0.6Mpa;working pressure≤0.3 Mpa;working temperature≤180OC
(6)SG-Vb flange-connection and float-ball sight glass
DN
d
D1
D
L
H
BallΦ
Drawing no.
65
65
130
160
340
260
40
HGS0-128-01-1~4
80
80
150
185
340
270
40
HGS0-128-01-1~4
100
100
170
205
340
277
40
HGS0-128-01-1~4
125
125
200
235
340
290
40
HGS0-128-01-1~4
150
150
255
260
340
302
40
HGS0-128-01-1~4
Notes: PN≤0.6Mpa;working pressure≤0.3 Mpa;working temperature≤180OC
(7)SG-VI frame clamping sight glass
DN
W
A
H
B
L
Application case
PN≤1.6
PN≤2.5
15
18
75
85
110
200
200
PN≤2.5Mpa
Working pressure≤1.0 Mpa;
Working temperature: 0-180OC
20
18
75
85
110
200
200
25
22
80
95
120
210
210
40
30
90
125
120
210
230
(8)SG-VII frame-type single pressure sight glass
DN
W
A
H
B
L
Application case
PN≤1.6
PN≤2.5
50
30
90
140
120
210
250
PN≤2.5Mpa
Working pressure≤1.0 Mpa;
Working temperature:0-180OC
65
30
90
155
120
220
250
80
35
100
180
120
230
250
100
35
100
205
120
230
260
125
40
110
235
130
260
290
150
40
110
260
130
260
290
(9)SG-VIIIa container sight glass
DN
PN
D
D1
b1
B2
≈H
Bolts
n
d
50
1.0
130
100
34
22
79
6
M12
1.6
130
100
34
24
79
6
M12
2.5
130
100
34
26
84
6
M12
80
1.0
160
130
36
24
91
8
M12
1.6
160
130
36
26
91
8
M12
2.5
160
130
36
28
91
8
M12
100
1.0
200
165
40
26
100
8
M16
1.6
200
165
40
28
105
8
M16
125
1.0
225
190
40
28
105
8
M16
150
1.0
250
215
40
30
110
12
M16
Note: temperature 0 - 180 ℃
(10)SG-VIIb container with sight glass
DN
PN
D
D1
B1
B2
dh×S
H
≈H
Bolts
n
d
50
1.0
130
100
34
22
57×3.5
70
79
6
M12
1.6
130
100
34
24
57×3.5
70
79
6
M12
2.5
130
100
34
26
57×3.5
70
84
6
M12
80
1.0
160
130
36
24
89×4
70
86
8
M12
1.6
160
130
36
26
89×4
70
91
8
M12
2.5
160
130
36
28
89×4
70
96
8
M12
100
1.0
200
165
40
26
108×4
80
100
8
M16
1.6
200
165
40
28
108×4
80
105
8
M16
125
1.0
225
190
40
28
133×4
80
105
8
M16
150
1.0
250
215
40
30
159×4.5
80
110
12
M16
Notes: the container refers to HGJ501-501-86 standard with working temperature 0-180OC
(11)SG-IXa single-pressure reducing sight glass
DN1×DN2
L
D
H
Application case
PN0.25
PN0.6
25×32
260
95
226
234
Working temperature:0-180℃
40×50
320
140
226
278
50×65
320
140
226
278
65×80
360
165
300
308
80×100
360
165
300
308
(12)SG-IXb single-pressure reducing sight glass
DN
L
D
H
I
II
III
PN0.25
PN0.6
25
40
40
260
95
226
234
25
50
50
320
140
266
278
25
65
65
320
140
266
278
40
80
80
360
165
300
308
40
100
80
360
165
300
308
25
40
50
320
140
266
278
40
50
65
320
140
266
278
50
65
80
360
165
300
308
50
80
100
360
165
300
308
Note: temperature 0 - 180 ℃