Applications of the globe valve (Part two)

Globe valves used for high temperature and high voltage power stations
The valve body and the valve bonnet of globe valves used for high temperature and high voltage power stations adopt self sealed pressure or clamp connections. The connection between the valve body and the pipeline is butt welding connection. The valve body mostly is made of chrome molybdenum steel or chrome molybdenum vanadium steel, and the sealing surface is welded by hard alloys. Therefore, the globe valves are resistant to high temperature, high pressure and heat; the sealing surface of the globe valve is wear, scratch and corrosion resistance, and the globe valves have good sealing performance and long service life. All of these make the globe valves very suitable for high temperature and high pressure water, steam, oil and superheated steam pipelines in thermal power industrial systems, petrochemical systems and metallurgical industries.
 
Globe valves used for oxygen pipelines
Globe valves used for oxygen pipelines are strictly design according to the requirements of the oxygen pipeline. The outer part of the stuffing box is strictly sealed so as to prevent external dirt from entering the stuffing box. There are grounding devices on both ends of flanges of valve bodies. After the pipe is installed, ground wire should be connected in order to prevent static ignition. Austenitic stainless steel or copper alloy is often selected for the housing material of the globe valve, which makes the globe valve have good electrical conductivity and not easily generate static ignition. The sealing pair's material is PTFE which is good for the valve body's material. The sealing performance is good, and the leakage rate is zero after inspection. The globe valves are mainly applied to oxygen pipelines in metallurgical systems as well as other industries.
 
Globe valves used for liquefied petroleum gas 
Globe valves used for liquefied petroleum gas are designed for pipelines or devices of liquefied petroleum gas. The structure of globe valves used for liquefied petroleum gas should confirm to fireproof requirements. The packing box is made of polytetrafluoroethylene, which is reliable in sealing and has no external leakage. The sealing pair's material is made of Teflon or nylon which is good for the valve body's material, and the sealing is reliable. The globe valves are suitable for pipeline systems of liquefied petroleum gas, as an opening and closing device, and they can also be used as shut off valves for other pipelines whose media's temperature is lower than 80℃.

Globe valves with upper threaded stems 
Globe valves with upper threaded stems are not in direct contact with media, and they are used for different working conditions based on different materials of housing and inner parts. If the housing is made of carbon steel, the sealing pair should be made of alloy steel, the packing box flexible graphite and the valve stem Cr13 stainless steel. This kind of globe valve is used for water, steam and oil pipelines. The housing adopts 12Cr18Ni9 or 06Cr19Ni10, and the sealing pair's material is the same as the valve body's material or hard alloys; the packing box is made of PTFE, and the valve stem is made of 1Cr18Ni12Mo2Ti. This kind of globe valve is applied to pipelines or devices which carry corrosive media, mainly acetoxy. The maximum nominal size of the upper threaded stem globe valve is generally DN200. It is best to install internal or external bypass valves for the upper threaded stem globe valve whose nominal size is above DN200.
Aug 24,2018
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