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Yuhuan Yunda Valve Co., Ltd.
Add: Qinggang Industrial Zone, Yuhuan, Zhejiang, China.
P.C.: 317606
Tel: 0086-576-89929181
Fax: 0086-576-87105853
E-mail:sales@ydvalve.com
Http://www.ydvalve.com
Technical Parameters Your Position: Home >> Technical Parameters
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
1.62.54.06.410
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

120 F52棩

Testing temperature

water

Seal function test

Testing pressure Mpa

2.4

No leak

Continued time 15

15

Testing temperature

120 F52棩

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:120
Male thread according ISO 228/I
Size:1/2*3/8塢1/2*1/2塢1/2*3/4
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