Differences between API6D and API598 20

Differences: API598 is a standard for various valves, while API6D is an experimental standard for pipeline valves.

Attached: API6D: American Petroleum Institute Certification API600: American Standard Gate Valve Certification.

The provisions of API 6D specification on valve testing are very different from API 598 "Inspection and Test of Valves" and ISO5208 "Pressure Test of Industrial Valves ——— Valves" and other valve test standards. The test of API 6D-2008 specification (23rd edition) consists of two parts, one is a mandatory test, and the other is a special supplementary test, which is only carried out when the buyer expressly provides for it in the contract.

The test medium for API6D is fresh water, and light oil with a viscosity of no more than water can be used after negotiation. It is very different from the API 598 standard, which stipulates the use of high-pressure liquid seal test or low-pressure gas seal test according to the different valve types, calibers and pressure levels, while the conventional pressure test of the API 6D specification does not include the low-pressure gas seal test, and the low-pressure or high-pressure gas seal test is only carried out when the user has special requirements.

First, the numbers are different, 1 is 6, 1 is 598. Section 2: 1 has the letter d, 1 does not.

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Differences: 1. The certification standards of the two are not the same. API600 refers to the American standard gate valve certification; API6D refers to the American Petroleum Institute certification.

2. API6D: pipeline valve. There is basically no mating set with API600. The gate is a monolithic type, such as a flat gate valve, and a two-piece or multi-piece type, such as an elastic gate valve.

API600: Must be a wedge-in single ram or a rigid or elastic wedge-type single ram construction, unless otherwise specified.

Valve type. Gate valve: A gate valve has a shut-off (ram) that moves in a plane perpendicular to the direction of flow of the medium. The ram can be a single piece and is used for flat gate valves; or two or more pieces for push-open gate valves.

Oil-sealed or non-oil-sealed plug valves: Plug valves should have a cylindrical or conical closure (plug) that rotates around an axis perpendicular to the direction of media flow.

Ball valve: A ball valve should have a spherical shut-off (ball) that rotates around an axis perpendicular to the direction of the balance of the medium flow.

Check Valve: The check valve should have a shut-off (disc) that automatically acts to block the flow of media in one direction.

Here are some of the 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, Su Yan, 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 the user's stove.

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 changing rapidly, and the rankings may vary by time and region. For the latest ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.