| VALVE BORE SORTING STANDARD |
There are different understandings for DN in different countries.It is an integer which is a little different from practical diameter.It is divided into reuced bore,full bore and flow diameter by different valve,nominal pressure,spece sizes.It is carried out by gb/t12238,GB/T7746 in China.
Inch system is applied to Bs5351.
American standard:ANSI.B16.1;ASME.B16.34;AP16D.
Japanese diameter system conform JIS.2001. |
| The Minimum Flow Diameter
(GB/T12237-1989)(mm)
|
| DN Nominal Diameter |
The Minimum Flow Diameter |
| Reduced Bore |
Non-Reduced Bore |
| MAP Nominal Pressure |
| 1.6¡¢2.5¡¢4.0¡¢6.4¡¢10 |
| 10 |
- |
9 |
9 |
| 15 |
9.5 |
12.5 |
12.5 |
| 20 |
12.5 |
17 |
17 |
| 25 |
17 |
24 |
24 |
| 32 |
23 |
30 |
30 |
| 40 |
28 |
37 |
37 |
| 50 |
36 |
49 |
49 |
| 65 |
51 |
64 |
64 |
| 80 |
57 |
75 |
75 |
| 100 |
73 |
98 |
98 |
|
| Low middle pressure ball valve inspecting and testing |
Methods&Procedures for shell test
Covering the entrance and exit of the valve,pressing the gland tightly to make the disc be in intermediate positions.Full filling with medium in the shell body to reach testing pressure gradually.Inspecting for the shell including the gland and union between the body and cap to see if there is leakage when reaches to stipulated time.
Methods&Procedures for Seal function test
Covering the two ends of the valve to make the disc be slight opening position and to reach to testing preesure with full medium in the shell body.Releasing the pressure of one end when closing.Doing the same with another end .Being tested by seal function to make sure without any leakage before selling into the makets.
Testing temperature.Testing medium.Testing pressure.The shortest continued time and allowed leak rate on shell test and seal function test as following sheet. |
Item |
Enforce standerd |
Allowed leak rate |
Shell test |
Testing pressure Mpa |
2.4 |
No leak(no obvious dropping of surface wet) |
Continued time 15 |
15 |
Testing temperature |
¡Ü120¡ã F£¨52¡æ£© |
Testing temperature |
water |
Seal function test |
Testing pressure Mpa |
2.4 |
No leak |
Continued time 15 |
15 |
Testing temperature |
¡Ü120¡ã F£¨52¡æ£© |
Testing temperature |
water |
|
 |
| NO. |
Name |
Material(part ART.NO) |
| 0 |
Screw |
Stee; zomc[a;ted |
| 1 |
Handle |
Forged steel(1) |
| 2 |
handle |
Steel,plastic(2) |
| 3 |
handle |
Aluminium(3) |
| 4 |
handle |
Aluminium(4) |
| 5 |
O-Ring |
Viton/N.B.R. |
| 6 |
Stem |
Brass MS 58 |
| 7 |
Ball |
Brass MS 58 Chrome plated/Iron |
| 8 |
Seal |
Teflon |
| 9 |
Body |
Brass MS58 |
|
| ANGLE VALVE SPECIFIATION: |
The valve used brass rods from the heat forging and treated the surface polished and chrome plated.
Selecting the high-quality ceramic sealing.Good corrosion resistance and easy for operating.NO fade,no aging,durable,environmental friendly,safe and health harmless to body.
Screw of water inlet using shaping technology to assure good seeling performance when using the anaerobic adhesive during fixing and shows more humanizaniation. |
| TECHNICAL SPECIFICATION: |
Normal pressure:16bar
Working medium:Water
Working temperature:¡Ü120¡æ
Male thread according ISO 228/I
Size:1/2¡å*3/8¡å¡¢1/2¡å*1/2¡å¡¢1/2¡å*3/4¡å |
