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The difference between American, Germany and China standard valve

The difference between American standard valve, German standard valve and China standard valve

lug type butterfly valve, ductile iron, center lined,

lug type butterfly valve, ductile iron, center lined,

(American Standard, German Standard, National Standard) The difference between the valves:
First of all, it can be distinguished from the standard codes of various countries: GB is the national standard, the American standard (ANSI), and the German standard (DIN). Secondly, it can be distinguished from the model. The valve model of the national standard is named according to the pinyin letter of the valve category. For example, the safety valve is A, butterfly valve, D, diaphragm valve, G, check valve, H, globe valve, J, throttle valve, L, drain valve, P, ball valve, Q, trap, S, gate valve, and so on. ,
There are no special specifications between American standard valves, German standard valves, and national standard valves. It is nothing more than the difference between production standards and pressure levels. The material of the valve body and internal parts are easy to say, it is nothing but cast iron, cast steel, stainless steel, etc. Taking the American standard as an example, the pressure level of the American standard ranges from 125LB to 2500LB (or 200PSI to 6000PSI), and the main standard is API, ANSI, commonly referred to as API, and ANSI valves are American standard valves; German standard valve pressures are usually PN10 to PN320. DIN standard; if the valve is flanged, the corresponding flange standard must be adopted. The world’s main valve standards are also the American Standard Petroleum Institute API standard, the American national standard ANSI, the German standard DIN, the Japanese standard JIS, the national standard GB, the European standard EN, and the British standard BS. ,
Simply put, American standard valves are valves designed, manufactured, produced and tested according to American standards. German standard valves are valves designed, manufactured, produced and tested according to German standards. The national standard valve is the valve designed, manufactured, produced and tested according to our country’s standard. The differences between the three are roughly as follows: 1. The flange standards are different; 2. The structural length is different; 3. The inspection requirements are different.
National Standard Valves American Standard Valves German Standard Valves (American Standard, German Standard, National Standard) Valve Standards: Chinese National Standards (GB) Chinese Ministry of Machinery Standards (JB) American National Standards (ANSI) American Petroleum Institute Standards (API) American Society for Testing and Materials Standards (ASTM) American Valve and Fitting Manufacturers Standardization Association Standards (MSS) Japanese Industrial Standards (JIS) German National Standards (DIN) French National Standards (NF) British National Standards, European Standards (BS, EN) Other National Valve Standards ( ГOCT, IEEE, UL)

Tianjin Tanghai Valve Manufacturing Co., Ltd. is one of the largest butterfly valve manufacturers in China. It was founded in 2006. Its predecessor was Tanghai Valve Manufacturing Factory. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services.

After 14 years of continuous development and innovation, the company now has a group of high-tech engineers, technicians and skilled production workers, advanced production technology, sophisticated manufacturing equipment, complete testing methods, in strict accordance with international standards and quality management system, formed A comprehensive quality control network.

Our products use advanced manufacturing technology, and strictly conform to API, DIN, BS, EN, ISO, GB and other international standards. The main products are butterfly valves, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…), etc. Our products are widely used in various fields such as marine industry, shipbuilding, petrochemical, metallurgy, water treatment, fire fighting, water supply and drainage, etc. The company has won unanimous recognition and praise from customers with high quality and good reputation.

Features and structure drawings of flange butterfly valve

The main features of  flange butterfly valve are:

  • Small and light, easy to disassemble and repair, and can be installed in any position.

    U type flange butterfly valve (2)

    U type flange butterfly valve (2)

  • The structure is simple and compact, the operating torque is small, and the 90° turn to open quickly.
  • The flow characteristics tend to be straight, and the regulation performance is good.
  • The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes possible internal leakage points.
  • The outer circle of the butterfly plate adopts a spherical shape, which improves the sealing performance and prolongs the service life of the valve. It still maintains zero leakage after opening and closing more than 50,000 times under pressure.
  • ​​The seal can be replaced, and the seal is reliable to achieve two-way sealing.
  • The butterfly plate can be sprayed with a coating layer, such as nylon or PTFE, according to user requirements.
  • The valve can be designed as flange connection and wafer connection.
  • The driving mode can be manual, electric or pneumatic.

Flange butterfly valves are suitable for water supply and drainage, sewage, food, heating, gas, ships, hydropower, metallurgy, energy systems, textiles and other industries with a temperature of ≤120℃ or ≤150℃ and a nominal pressure of ≤1.6MPa. They are especially suitable for two-way sealing and In occasions where the valve body is prone to rust, it is used as a flow adjustment and interception medium.

Internal structure diagram of flange butterfly valve: see attached below

Clamp flange connection sequence:
1. Piping: Use a pipe cutter or a grinding wheel cutting machine to cut the stainless steel pipe vertically according to the required length, trim the end burr, and make it round;

2. Welding: The left and right tapered flange flange pieces (with grooves, specially used for embedding the flange gasket on both sides) are respectively welded to the two piping ports that need to be connected by argon tungsten arc welding (TIG welding) ;

3. Gasket: double-sided flange gaskets are lined between the left and right flanges;

4. Fastening: clamp the two flanges with a clamp, and then use a fastening screw (hexagon socket bolt) to clamp the flange or fasten the handle (one end of the external thread is connected with the internal thread of the handle, and one end is flexibly connected with a fixed rivet) .

Executive standard: API, DIN, BS, EN, GB and other international standards.

Tanghai Valve is the best manufacturer of flange butterfly valve in China. We produce the best quality products with competitive low prices. Our products use advanced manufacturing technology, and strictly conform to API, DIN, BS, EN, GB and other international standards. The main products are butterfly valves, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…), etc. Our products are widely used in various fields such as marine industry, shipbuilding, petrochemical, metallurgy, water treatment, fire fighting, water supply and drainage, etc. The company has won unanimous recognition and praise from customers with high quality and good reputation.