The valve seal is the key part to determine valve performance. The other factors like corrosion, friction, flash, erosion, oxidation, and ect should be considered when selecting sealing surface material. Valve seals are usually divided into two categories, one is a soft seal such as rubber (including butene rubber, fluoro rubber, etc.), plastic (PTFE, Nylon, […]
Nuclear valve refers to the valves used in the Nuclear Island (NI), Conventional Island (CI) and auxiliary facilities, the balance of Nuclear Island (BOP) system of the power plant. These valves can be divided into class Ⅰ, Ⅱ, Ⅲ, non-nuclear according to its security requirements in sequence. Valves are the most used control equipment transporting […]
The common material of valve body includes carbon steel, low-temperature carbon steel (ASTM A352 LCB/LCC), alloy steel (WC6, WC9), Austenitic stainless steel(ASTM A351 CF8), cast copper-alloy titanium alloy, aluminum alloy, etc., of which carbon steel is the most widely used body material. ASTM A216 WCA, WCB and WCC are suitable for medium and high-pressure valves […]
The element Molybdenum (Mo) is a strong carbide and was discovered in 1782 by Swede chemist HjelmPJ. It usually exists in alloy steels in amounts of less than 1%. Chromium-molybdenum steel can replace chromium-nickel steel sometimes to produce some important working parts such as high-pressure valves, pressure vessels, and has been widely used in tempered […]
Polyetheretherketone (PEEK) is a high-performance polymer (HPP) invented in the United Kingdom in the late 1970s. It is regarded as one of the six major specialty engineering plastics along with polyphenylene sulfide (PPS), polysulfone (PSU), polyimide (PI), polyaromatic ester (PAR) and liquid crystal polymer (LCP). PEEK offers excellent mechanical properties compared with other special engineering […]
Globe valve and butterfly valve are two common valves used to control the flow in the pipeline. The disc of the globe valve moves in a straight line along the centerline of the seat to open and close the valve. The stem axis of the globe valve is perpendicular to the sealing surface of the […]