Rubber-seat Double-Eccentric Small-resistance
Slow-closing Flanged Butterfly Check Valve
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TEL:+8610 88580010/20/30
FAX:+8610 88580150
V-FLO
Rm A-205 Ziyunxuang Building
No.81 Zizhuyuan Rd. Haidian Dist. Beijing China
Rubber-seat Double-Eccentric Small-resistance
Slow-closing Flanged Butterfly check valve
Technical Data:
Nominal Diameter DN
Nominal Pressure PN
Testing Pressure
mm
1200～1800
1.0
1.6
0.6
1.0
Sealing
1.1
1.76
0.66
1.1
Shell
1.5
2.4
0.9
1.5
Working Temperature ℃
Suitable Mediums
300～1000
MPa
-10～+120
Fresh water, Sewage, Sea water, Food, Medicine, Oils, Acids, etc.
Features:
(1) Small in size, light in weight, compact in structure, easy in maintenance.
(2) Newly designed in slow-closing equipment, reasonable and compact structure, safe and reliable in operation. And
mounted out of pipelines to avoid contaminating mediums.
(3) Run steady without noise and shaking.
(4) The double-eccentric structure with best structure parameters is good at reducing shaking, current resistance and waterhammer effect.
(5) This valve is tightly sealed without leakage.
(6) Quick ON-OFF operation with ON-OFF pressure below 0.08MPa, "Closing" operation can be operated in Fast-Slow two
stage model which is adjustable and in large range of slow-closing time, suitable in various working conditions.
(7) Avoiding hurting people and slow-closing failure in case of burst of oil pipeline. And good at energy saving.
Products Standards:
(1) The connection dimensions of flanges accord with the standards of GB/T17241.6-98 "Grey Cast Iron Pipe Connection Dimensions of Flanges ", or JB/T 79.1, BS 4504, DIN, ANSI B16.5 etc.
(2) The face to face dimensions are in accordance with the dimensions of long series of double flanged butterfly Valve given in
GB12221-89 "Metal valves for use in Flanged Pipe Systems Face-to-Face and Centre-to-Face Dimensions".
Working Principle
This valve comprises body, disc, shaft, cushion pressure gauge,
etc. Under the mediums pressure, the disc opens to make mediums flow through. By which, the piston stem is pulled to the
"ON" point.
The disc closes automatically with the mediums flowing back
and the weight of the disc itself as the mediums stop flowing.
(EX: the pump stops abruptly) With the effect of cushion pressure gauge, the closing of the disc shifts from Fast-closing state
(from full open point which is 85°to the point 70°) to slow-closing
state, in which the damp is larger than that in the former state.
So the destructive water-hammer effect can be eliminated.
Caution: This valve works well to eliminate destructive waterhammer under the condition that tire purlieus are in normal case
when there is a power-cut accident. So, under normal case, this
valve is open.
Recommendation: To get the best efficiency, this valve should
be installed with the same size electric butterfly valve simultaneously.
Opening
Angle 85°
1
2
3
4
1 — Oil Injection Plug
3 — Drain Valve
®
V-FLO
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2 — Hydro Cylinder
4 — Lock Nut
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Product Introduction
The Rubber-seat Double-Eccentric Small-resistance Slow-closing flanged Butterfly check valve,
newly developed by our company, is suitable for systems in the industries of oil, petrochemical, food
processing, medicine, textile, paper-making, water supply and drainage, metallurgy and energy used
as a check valve in one way, to prevent the mediums from flowing back and eliminate destructive
water-hammer effect.
TEL:+8610 88580010/20/30
FAX:+8610 88580150
V-FLO
Rm A-205 Ziyunxuang Building
No.81 Zizhuyuan Rd. Haidian Dist. Beijing China
WWW.CHANGCHA.COM
Structure:
Flow
Drain Valve
Main Parts Material:
SN
Part Name
Material
1
Cushion Pressure Cylinder
Steel (main)
2
Body
Cast Iron, Ductile Iron, Cast Steel
3
Sealing Ring
Buna-N, EPDM
4
Retainer
Q235-A (Carbon Steel)
5
Disc
Ductile Iron
6
Rocker
Q235-A (Carbon Steel)
7
Normal Key-On-Flat
45
8
Shaft
2Cr13
9
Pins
2Cr13
10
Shaking-Resistance Shim
Buna-N
DN
(mm)
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600
1800
Capacity
(m3/h)
665
923
1224
1568
1953
2852
3920
5158
6417
7977
4408
15680
20632
26261
Head Loss (m)
0.13
0.12
0.11
0.10
0.10
0.09
0.12
0.11
0.11
0.09
0.06
0.06
0.06
0.07
Pressure
Loss(Pa)
1300
1200
1100
1000
1000
900
1200
1100
1100
900
600
600
600
700
Flow
Resistance (ξ)
0.39
0.35
0.32
0.29
0.26
0.23
0.32
0.29
0.29
0.23
0.17
0.15
0.16
0.16
C Value
5875
8487
11672
15459
19878
30709
35257
48610
61521
85292
142845
204775
258832
317644
®
V-FLO
3
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Technical Data (Medium: Water, Flow Velocity: 3m/s)
V-FLO
TEL:+8610 88580010/20/30
FAX:+8610 88580150
Rm A-205 Ziyunxuang Building
No.81 Zizhuyuan Rd. Haidian Dist. Beijing China
WWW.CHANGCHA.COM
Dimensions:
Flow
Direction
A
300
460
350
520
400
580
450
500
615
C
400
410
460
470
515
525
565
640
585
670
620
715
650
780
725
840
770
700
910
800
600
B
D
L
b
f
L1
L2
E
F
G
H
J
K
Ø
Ø1
370
310
270
32
4
116
75
300
485
500
490
380
210
152
20
430
360
290
32
4
116
103
320
510
500
470
400
230
152
20
482
405
310
38
4
116
130
330
540
500
470
442
252
152
20
532
455
330
4
170
157
355
585
590
510
450
260
200
20
585
505
350
685
605
390
840
800
708
430
1025
950
905
808
900
1125
1050 1005
1000
1255
1200
1455
1400
1675
1600
1915
1800
2115
1160
1170
1340
1380
1560
1590
1760
1820
1970
2020
32
40
34
42
36
4
170
185
380
645
590
495
490
280
200
20
5
170
240
440
725
590
490
672
300
200
20
54
5
211
295
498
808
770
560
700
340
230
20
470
56
5
211
350
570
850
770
540
790
380
230
26
908
510
58
5
236
405
638
935
920
785
870
400
260
26
1110 1010
550
60
5
236
160
695
1050
920
765
950
420
260
26
1330 1210
630
56
5
287
570
880
1230 1180
920
1040
450
285
26
1530 1415
710
62
5
287
665
995
1380 1180
870
1500
475
285
33
1750 1620
790
68
5
344
775
1078 1525 1420 1060 1600
530
340
33
1950 1820
870
70
5
344
885
1125 1575 1420 1010 1900
570
340
33
48
®
V-FLO
4
n-Ø2
12-Ø22
12-Ø16
16-Ø22
16-Ø26
16-Ø26
16-Ø30
20-Ø26
20-Ø30
20-Ø26
20-Ø33
20-Ø30
20-Ø36
24-Ø30
24-Ø36
24-Ø33
24-Ø39
28-Ø33
28-Ø39
28-Ø36
28-Ø42
32-Ø33
32-Ø39
36-Ø36
36-Ø42
40-Ø36
40-Ø48
44-Ø39
44-Ø48
Cylinder
Model
Weight
(kg)
XHG63
202
XHG63
220
XHG63
230
XHG80
XHG80
XHG80
248
268
296
326
457
487
XHG100
668
XHG100
873
XHG125
1089
XHG125
1298
XHG140
1970
XHG140
2860
XHG160
4057
XHG160
4920
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DN
(mm)
V-FLO
TEL:+8610 88580010/20/30
FAX:+8610 88580150
Rm A-205 Ziyunxuang Building
No.81 Zizhuyuan Rd. Haidian Dist. Beijing China
C Value:
The valve C is the flow rate (m3/n) of pure water at normal temperature passing
through the valve when the valve disc is fully opened and the pressure differential
between the two ends of the valve is (kg/cm2) 100kPa.
Opening Angle of the Disc
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C: Flow coefficient (m2) P1: Flow-in-side pressure (100kPa)
Q: Flow (m2/n) P2:Flow-out-side pressure (100kPa)
P: Medium density (kg/m3) 4P: Pressure loss in valve (100kPa)
Cv %
Numbering:
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H 4 7 X — 16
H : Check Valve
4 : Flanged Ends
7 : Butterfly Type Disc
X : Rubber Seated,
X1 — NR
X3 — EPDM
X5 — NBR
X7 — Viton
16: Nominal Pressure
10 — 10 kg, 1.0 Mpa
16 — 16 kg, 1.6 Mpa
Body Material: Cast Iron
®
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