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Non-return valve

Non-return valve

Item:Non-return valve

Short Description: Non-return valve means relying on the flow of the medium itself automatically open and close the valve, the valve to prevent the media back, also known as non-return valve, check valve, reflux valve, and back pressure valve. Check valves are an automatic valve, whose main role is to prevent the media back, to prevent the pump and drive motor reversal, and discharge the container medium. Pressure valve which can also be used to exceed the system pressure may rise auxiliary systems provide supply pipeline. Check valve can be divided into the swing check valve (depending on the focus of rotation) and lift check valves (axial movement).For 1.6 ~ 6.4MPa, piping various conditions operating temperature -29 ~ 550 ℃ of petroleum, chemical, fire station and the like. Applicable medium: water, oil, steam and so on.

Materials:Carbon Steel

Size/Dimension:DN15,DN20,DN25,DN32,DN40,DN65,DN65,DN80,DN100,DN125,DN150,DN200,DN250,DN300,DN450

Place of origin: China , Sell to worldwide.

Order or Inquiry on “Non-return valve
Models & Details for “Non-return valve”

Structure and Feature:

1, selected materials, in line with domestic and foreign standards, high overall quality of the material.
2, Sealing pair advanced and reasonable, the valve seat sealing surface using iron-based alloy or Stellite (Stellite) cobalt-based alloy cladding into the surface, wear-resistant, high temperature resistance, corrosion resistance, good anti-abrasion performance ,long lasting.
3, the product according to national standards GB / T12235 design and manufacturing.
4, can be a variety of standard pipe flanges and flange sealing types to meet various project needs and user requirements.
5, the full range of body materials, gaskets, according to the actual working conditions or user requirements reasonable matching can be applied to all kinds of pressure, temperature and medium conditions.
Users can design and manufacture different forms and connection forms a check valve structure for a variety of equipment for use.

Application :
The valves are used to prevent the media on Industrial valves, backflow devices.

Dimension and Parameter:
DN15,DN20,DN25,DN32,DN40,DN65,DN65,DN80,DN100,DN125,DN150,DN200,DN250,DN300,DN450…

Application Specifications

Design and ManufacturingGB/T12235
Connecting terminal sizeStructural lengthGB/T12221
Flange sizeJB/T79
Inspection and testingJB/T9092
MaterialCarbon steelGB/T12229
Stainless steelGB/T12230
Alloy steelQ/ZB66
MarkGB/T12220
AvailabilityJB/T7928

Main parts,materials and main uses

Valve bodyValve lidValveValve SeatFor mediaTemperature
(≤℃)
WCBWCB+D507MoWCB+D577Water, oil, steam425
ZG1Cr18Ni9Ti0Cr18Ni9+
Stellite12
0Cr18Ni9+
Stellite6
Pin acids,etc200
ZG1Cr18Ni2Mo2TiCF8M+Stellite12ZG1Cr18Ni2Mo2TiPhosphoric acid, acetic acid, mixed acid200
ZG00Cr17Ni14Mo2CF3M+Stellite12CF3M+Stellite6Urea, ammonium carbamate solution, a phosphate200
ZG1Cr5MoZG1Cr5Mo+
Stellite12
ZG1Cr5Mo+
Stellite6
Water, oil, steam550

Non-return valve dimension

DN
L
D
Dl
D2
b
Z一φd
H
WT(Kg)
H41H一16C H41Y一16C H41Y一16P H41Y一16R H41Y一161
15
130
95
65
45
14
4一φ14
77
3
20
150
105
75
55
14
4一φ14
77
4
25
160
115
85
65
14
4一φ14
80
5
32
180
135
100
78
16
4一φ18
85
7
40
200
145
110
85
16
4一φ18
95
9
50
230
160
125
100
16
4一φ18
105
10
65
290
180
145
120
18
4一φ18
120
20
80
310
195
160
135
20
8一φ18
130
30
100
350
215
180
155
20
8一φ18
140
39
125
400
245
210
185
22
8一φ18
155
50
150
480
280
240
210
24
8一φ23
180
70
200
600
335
295
265
26
12一φ23
211
231
250,
730
405
355
320
30
12一φ25
260
25l
300
850
460
410
375
34
12一φ25
323
395
H41H一25 H41Y一25 H41Y一25P H41Y一25R H41Y一251
15
130
95
65
45
16
4一φ14
100
3.4
20
150
105
75
55
16
4一φ14
105
5
25
160
115
85
65
16
4一φ14
120
5.7
32
180
135
100
78
18
4一φ18
130
9.1
40
200
145
110
85
18
4一φ18
135
11.8
50
230
160
125
100
20
4一φ18
149
14.4
65
290
180
145
120
22
8一φ18
160
23
80
310
195
160
135
22
8一φ18
169
30
100
350
230
190
160
24
8一φ23
194
44
125
400
270
220
180
28
8一φ25
222
65
150
480
300
250
218
30
8一φ25
255
99
200
600
360
310
278
34
12一φ25
305
190
250
730
425
370
332
36
12一φ30
355
323
300
850
485
430
390
40
16一φ30
410
450
DN
L
D
D1
D2
D6
b
Z一φd
H
WT(Kg)
H41H一40 H41Y一40 H41Y一40P H4lY一40R H41Y一401
15
130
95
65
45
40
16
4一φ14
100
4
20
150
105
75
55
51
16
4一φ14
105
5.5
25
160
115
85
65
58
16
4一φ14
120
6
32
180
135
100
78
66
18
4一φ18
130
12
40
200
145
110
85
76
18
4一φ18
135
14
50
230
160
125
100
88
20
4一φ18
149
18
65
290
180
145
120
110
22
8一φ18
160
27
80
310
195
160
135
121
22
8一φ18
169
36
100
350
230
190
160
150
24
8一φ23
194
50
125
400
270
220
188
176
28
8一φ25
225
75
120
480
300
250
218
204
30
8一φ25
255
119
200
600
375
320
282
260
38
12一φ30
305
217
250
730
445
385
345
313
42
12一φ34
360
365
300
850
510
450
408
364
46
12一φ34
415
310
DN
L
D
D1
D2
D6
b
Z一φd
H<, /o:p>
WT(Kg)
H41H一64 H4lY一64 H41Y一64P H41Y一64R H41Y一641
15
210
105
75
55
40
18
4一φ14
100
7
20
230
125
90
68
51
20
4一φ18
110
ll
25
230
135
100
78
58
22
4一φ18
125
13
32
260
150
110
82
66
24
4一φ23
140
14
40
260
165
125
95
76
24
4一φ23
168
20
50
300
175
135
105
88
26
4一φ23
170
23
65
340
200
160
130
110
28
8一φ23
188
37
80
380
210
170
140
121
30
8一φ23
205
46
100
430
250
200
168
150
32
8一φ25
230
68
125
500
295
240
202
176
36
8一φ30
230
89
150
550
340
280
240
204
38
8一φ34
265
131
200
650
405
345
300
260
44
12一φ34
310
235

 

Buying guide to “Non-return valve ”
Installation and maintenance on “Non-return valve ”

1, the valve passages to be blocked at both ends, there is a dry and ventilated room. If long-term storage should always check the anti-rust.
2, the valve should be cleaned before installation, and eliminate defects caused during transport.
3, must be carefully checked when installing signs and nameplates on the valve meets the requirements.
4, vertical lift check valve should be installed in a vertical pipe.
5. The level of valve lift check valve should be installed in horizontal pipelines.
6. Do not check valve in the pipeline to withstand the weight of large non-return valve should be self-supporting, so that the impact of unmanaged system pressure.
7, check valve, flow direction should pay particular attention to the media, the media should be consistent with the direction of the normal flow direction indicated by the arrow on the valve body, otherwise it will cut off the normal flow of media. Bottom valve should be installed in the bottom of the pump suction piping.
8, the formula lift check valve should be installed in horizontal pipelines, vertical lift check valve and bottom valve is usually installed in a vertical pipeline and the medium flows from bottom to top.
9, when the check valve is closed, it will produce water hammer pressure in the pipeline, can cause serious damage to the valves, piping or equipment, especially for large mouth lines or high-pressure line, it should cause the check valve’s choice close attention.

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