Can anyone give me the structural length standard of the American Standard and the National Standard

Here are some well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

According to the pressure, the American standard gate valve is divided into: 150lb 300lb 600lb 900lb 1500lb 2500lb, and the structural length is also different, including the flange is also different.

Please refer to other information.

When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation. In actual use, it is marked by the vertex of the valve stem, that is, the position that cannot be opened.

As it's fully open position. In order to account for the lock-up phenomenon of temperature changes, it is usually reverted back to 1 2 1 turns at the apex position as the position of the fully open valve.

dn stands for national standard, and the comparison figure is as follows:

Conversion of American standard valves and national standard valves

The unit of nominal diameter of the national standard valve is mm, and the unit of the nominal diameter of the American standard valve is in (inches) The conversion is as follows: below 100, 1 inch is equal to.

PNS stands for American standard, DN stands for national standard, and the comparison chart is as follows:

Conversion of American standard valves and national standard valves

The unit of nominal diameter of the national standard valve is mm, and the unit of nominal diameter of the American standard valve is in (inches).

The conversion is as follows: below 100, 1 inch is equal to.

dn15——1/2”

dn20——3/4”

dn25——1”

dn32——1 1/4”

dn40——1 1/2”

dn50——2”

dn65——2 1/2”

dn80——3”

Rounding data with rounding. 1" is equal to inches = GB 15mm3 4 inches = GB 20mm1" = 25mm1-1 4"=32mm1-1/2"=40mm2“=50mm

PNS stands for American standard, DN stands for national standard, and the comparison chart is as follows:

How can you tell if it's an American standard or a national standard?

The main standards of shut-off valves:

1. GB T 12233-2006 "General Valve - Iron Globe Valve and Lifting Check Valve".

2. GB T 12235-2007 "General Valve Flange Connection Steel Globe Valve and Lifting Check Valve".

3. JB T53174-94 "Globe Valve Product Quality Classification".

4. JB T53165-92 "High Pressure Balance Globe Valve".

5. GB T 587-2008 "Marine Flange Bronze Globe Valve".

6. GB T 590-2008 "Marine Flange Cast Iron Globe Valve".

7. GB T 8464-2008 "Iron and Copper Threaded Connection Valves".

8. Internal thread connection gate valve, globe valve, ball valve, check valve Basic size Iron globe valve

The length of the valve structure is according to the standard of JB T2203 1999 "Structural Length of Globe Valve", and the connection size of the flange is according to GB T9119-2000 standard pressure test, according to GB T13927-2008 "Industrial Valve Pressure Test", and the standard test is JB T8859-2004 "Static Pressure Life Test Regulations for Globe Valve".

The acceptance of the valve is according to the SH3518-2000 standard.

See what else needs to be asked?

The caliber size of the American standard valve and the national standard valve is different, and the specific loss comparison table is as follows:

The American standard globe valve wall thickness standard is the national standard GB T26640 for the valve wall thickness family, only the 2011 version, not the 2010 version. This standard specifies the wall thickness requirements for iron and steel valves such as ball valves, butterfly valves, gate valves, globe valves, check reviews, plug valves and diaphragm valves. GB 26640-2011 Minimum wall thickness size specification of valve shell If it is made of national standard steel, its basic standard is GB T12224 If it is made of American standard steel, the basic standard of Zhaozai is large, but these are only basic standards, if the corresponding product standard does not indicate the minimum wall thickness, you can follow the size of the basic standard, plus a certain corrosion margin, to obtain the minimum wall thickness.