Oil lubrication hard seal plug valve can be classified into conventional oil lubrication plug valve and pressure balance plug valve. Tailor-made grease is injected between body and plug from top of plug, forming oil film to reduce torque of valve, highly improving sealing and service life. Conventional oil lubrication plug valve a. For conventional oil lubrication plug valve, the installation of plug cone is forward assembling. To reduce friction between body and plug sealing face, the valve...
Types of Oil Lubrication Hard Seal Plug Valve Read
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Nowadays, superhigh pressure technique has already been used for petrochemical industry, chemical industry, metal forming, powder metallurgy and other industries. Due to superhigh pressure technique widely applied, the performances of superhigh pressure valve have directly influenced on security, reliability, operating efficiency and service life of the whole superhigh pressure system. The main reasons causing superhigher pressure valve losing efficacy are cavitation and erosion. There...
Properties of Materials Used for Superhigh Pressure Valve Read
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The excellent properties owned by full forging duplex stainless steel globe valve are determined by materials performances and valve structural features. Duplex stainless steel refers to ferrite and austenite inside solid solution account for half of proportion. So, duplex stainless steel combines high intensity and stress corrosion resistance to chloride of ferrite and good toughness and welding performances of austenite. Full forging duplex stainless steel globe valve features: 1....
Full Forging Duplex Stainless Steel Globe Valve Profile Read
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It is well known that valves are used to transport or control fluid and gas. Valves have wide application in fluid pipe system. Valves are mainly used to separate equipment and pipe system, control flow rate, prevent backflow, control and release pressure. And in order to ensure that valves can play important role, selection is very important. 1. Valves can be classified into butterfly valve, gate valve, ball valve and plug valve. Nevertheless, usage scope of valves must be noticed when choose valves....
Tips for Choosing Valves Read
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Pull rod welding ball valve has impressive performances in various industries. Because of excellent properties and high reliability, pull rod welding ball valve attracts more attentions than cast steel ball valve. Currently, pull rod welding ball valve has been widely applied in urban gas, urban heating, petrochemical industry, shipbuilding, steel and other industries. The followings are the features of pull rod welding ball valve. 1. The body is fully welded in case of external leakage; ...
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Extension rod butterfly valve is widely applied in chemical engineering, petrifaction, petroleum, paper making, mining, power, liquefied gas, food, pharmacy, drainage, municipal administration, electric industry, urban construction, etc. Several factors should be considered when choose extension rod butterfly valve First of all, when media flow through extension rod butterfly valve, the pressure loss is quite large, three times of gate valves. So when choose extension butterfly valve, regulation...
Features of Extension Rod Butterfly Valve Read
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Double offset butterfly valve is widely used in water supply, circulating water of electricity, petroleum, chemical engineering, etc. The common nominal diameter ranges from DN100mm to DN2000mm. The nominal pressure is 0.6MPa~1.6Mpa. In general, double offset butterfly valve is used as regulation or throttle equipments. High strength gray iron and nodular cast iron are used as raw materials. Double offset can separate disc from seat after valves being opened, eliminating over compression and scraping...
Types of Infiltrants Used to Repair Butterfly Valve Read
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Structural features of stainless steel butterfly valves The spring of stainless steel butterfly valves is assembled together with adjusting bolts on plate. The structure compensates effectively tolerance zone between shaft sleeve and body and elastic deformation of stem under the pressure of media, realizing sealing of valves when transmitting two-way interchangeable media. Stainless steel butterfly valves adopt sealing ring consisting of multi-lever stainless steel plates, having metal-to-metal...
Structural Features of Stainless Steel Butterfly Valves Read
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Working principles of plug valves Plug valves are a type of valves which use plug with a hole as disc. The plug rotates along with the stem to realize on-off. Small plug valves without packing are also called as corker valve. Most of plug used by plug valves are cone (some also cylinder). The plug cooperates with surface of concial hole on plug to form sealing pairs. Plug valves are one of valves which are used in the earliest, having simple structure, rapid on-off and low fluid resistance. ...
Working Principles of Plug Valves Introduction Read
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The disc or butterfly plate of butterfly valves rotates shaft roundly to open or close. Butterfly valves are mainly used for cutting-off or throttling in pipes. Butterfly valves are suitable for pipelines of engineering systems to transmit corrosive or non-corrosive fluid media, including coal gas, natural gas, liquefied petroleum gas, etc. Applicable working conditions of butterfly valves: Butterfly valves are appropriate for flow regulation. Because butterfly valves have large pressure...
Applicable Working Conditions of Butterfly Valves Read
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