News & Notes
The main products of this company are Bronze valves, API/DIN gate/globe/ check valves/butterfly valve/plug valve, ball valves and forged steel valves. Its products have been widely used in petroleum, petrochemical, chemical, metallurgy, electric power, water conservancy, machinery and many other fields.
Duplex 2507(5A) is a widely used variant of stainless steel (both Ferritic and Austenitic). Duplex 2507(5A) exhibits excellent corrosion resistance. It resists intergranular and crevice corrosion. It also shows appreciable resistance to pitting. Chloride stress corrosion cracking is also dealt with easily using Duplex 2507(5A), at a temperature of 150 degree Celsius. It proves to be an excellent substitute of austenitic grades in marine environments. It shows good thermal resistance up to a range of 300 degree Celsius. It can be easily welded by most of the standard methods, the only compulsion being the use of filler metals. The machinability is low on account of its high strength. This variant of steel has a wide variety of applications. It is used in oil and gas exploration, chemical processing industries also make use of this alloy. Most of the processing equipment utilizes Duplex 2507(5A). It is also used by storage and transportation units of industries. Pulp and paper digesters, liquor tanks and paper machines also use Duplex 2507(5A). It is highly suitable for usage in marine environments. Super Duplex Stainless Steel 2507 Ball Valves are internationally accepted by companies around the world. They are highly welcomed by clients from UK, Turkey, Germany, Australia & USA. Mechanical properties of Duplex Stainless Steel 2205(4A) Ball Valves, Super Duplex Stainless Steel 2507(5A) Ball Valves.
Sedelon ®---------Bronze Valves Expert Zhejiang Sedelon valve co., LTD is a professional bronze valves company production factory, we are the best bronze valves manufacturer in China. The material of Bronze has characteristics of low melting point, high hardness, plasticity, and wear resistant, corrosion resistance. So bronze valves have excellent impact resistance strength,minimum heat loss and corrosion resistance. Bronze valves are generally used in the chemical and Oil field and mainly for the offshore, platform and marine usage. Sedelon produces the bronze valves mainly according to the API 600 Standard.It’s not easy to produce and process the bronze valves. We should pay much attention especially in the casting process---This is the beginning part and the vital part. Flange end Dimension :ANSI B16.5 Butt Welded Dimensions：ANSI B16.25 Design and Manufacture：API 600 Pressure Test：API 598 Main material： C95800、C95500、C95200、C95300、C95600、C61900、C63200, ect. *The valves’ flanges are under the processing . According to the client’s requirements, the flanges finish can be processed as Raised face or Flat face or RTJ type.
Penetrant Testing（PT） By applying penetrant, the redundant parts is removed with a detergent, and if necessary, applying imaging agent to obtain an indication of some defects opening on the surface in the part. Penetration testing is based on the liquid to the solid's wetting ability and capillary phenomenon in the physics, first let contain dyes and high penetration of the liquid penetrant, coated to the surface of the tested workpiece, due to the liquid's wetting action and capillary action, the penetrant infiltration into the surface opening defects. After applying the penetrant, it is permitted to sit on the surface for a specified period of time (the "penetrant dwell time"), then the part is carefully cleaned to remove excess penetrant from the surface. A light coating of developer is then be applied to the surface and given time ("developer dwell time") to allow the penetrant from any voids or fissures to seep up into the developer, creating a visible indication.
Sedelon Valve Provide a lot of Check Valves.Such as Swing Check Valves,Lift Check Valves,Wafer or Dual Palte Check Valves,Tilting Disc Check Valve and so on. Today we specially recommend the High Pressure Seal Tilting Disc Check Valve. The High Pressure Seal Tilting Disc Check Valves’ Main Feature: 1.Design of double eccentric disc,When valves closed, the valve seat and the sealing surface gradually touch, in order to achieve no impact, no noise. 2.The design of High Pressure Seal and Micro elastic metal seat can make good sealing performance. 3.Small flow resistance and save energy 4.Butterfly valve design, quick, sensitive switch, long service life. Tilting Disc Check valve generally applies to clean medium, should not be used for medium containing solid particles and viscosity is bigger. As a one of main products in Sedelon Valve Company,The main production material of Tilting disc Check Valves is Cast steel, Stainless steel and Alloy steel ,Bronze,Cast Iron and so on.
Positive Material Identification (PMI) is the analysis of a metallic alloy to establish composition by reading the percentage quantities of its constituent elements. The object of this nondestructive testing method is to identify metal alloys in place using a portable X-Ray fluorescent analyzer that determines the elemental composition of the material. At Sedelon, we have our own hand held Positive Material Analyser for confirming all stainless steel grades, Inconels, Hastelloys, Duplexes Steels and much more, without having to transport, alter, or damage the material. For Duplex Stainless Steel and Stainless Steel valves, PMI is conducted by using PMI XRF portable test gun, pointed at the external surface of completed valves. Parts of valves to be PMI tested are: a)Body, b)Bonnet, c)Stem, (for all valves having externally-exposed stems) By using PMI test, we can confirm all material received against orders raised by clients, and all tests can be witnessed by clients or their nominated inspectors.
Sedelon Valve Provide a lot of Pressure Seal Valves,Today we main talk about Pressure Seal Valves. Pressure Seal Gate Valves are suitable for the nominal pressure PN20.0 ~ 32.0 Mpa (900 lb to 2500 lb) and P (54) 100 v ~ P(57)170 v ,working temperature 540 ℃ or less (P (57) 170v of whom working temperature is 570 ℃) of oil, chemical industry, hydropower and thermal power plant under various working conditions such as the pipeline, cut off or connect medium. Valve filling flexible graphite, braided graphite and middle packing set combination.Both has good sealing performance and has certain strength, to ensure that the valve without leakage, accord with environmental protection requirement. Pressure is used to connect the valve body and cover the self-sealing sealing structure. Slot wedge zone of the sealing ring (mild steel or stainless steel) and the four open loop combination;Body parts corresponding carbide surfacing, forcing a reliable sealing ring deformation under high pressure. The higher the pressure sealing is more reliable. Feature: Pressure Range:(900LB-2500LB),(P (54) 100 v ~ P(57)170 v ) Applicable medium:water, oil, steam, etc. Operation mode: manual, electric, hydraulic, etc. Temperature:<=540 ℃, Connections:Butt Welding ends, Design Standard:AISI,DIN,JIS,BS ,Etc. Material:Cast Steel,Carbon Steel,Bronze,Stainless Steel ,Etc.
Heat treatment for Sedelon Valves Heat treatment is a method used to alter the physical, and sometimes chemical properties of a material. The most common application is metallurgical. It involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. It applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally Types of Heat Treatment (Steel): 1) Annealing / Normalizing, 2) Case hardening, 3) Precipitation hardening, 4) Tempering, and Quenching The purpose of Heat Treatment:
Forged steel flange globe valves are the valves whose disc move along the valve seat center-line when closing and opening. Regarding these kinds of valves , the most obvious advantage is: In the process of opening and closing, due to the friction between the disc in the valve sealing surface is smaller than gate valves, so it is much durable and wear-resisting. The rising height in the process of opening is generally only a quarter of the seat channel’s diameter, so the shape and size are much smaller than gate valves. Typically there is only one sealing surface on the valve body and disc, thus it is easy to maintenance.
API598 Inspection and Testing Inspection Range: This standard covers the inspection, test, complementary inspection and pressure test of Gate, Globe, Check, Ball, Butterfly and Plug valves. Testing Types: A shell test B backseat test C low pressure seal test D high pressure seal test E appearance inspection of casting F high pressure gas shell test．
Sedelon®Lift Check Valve Sedelon Valve Provide a lot of Check Valves,Today we main talk about Lift Check Valves.
The Difference Between Gate Valves and Globe Valves @Sedelon® In the process of regulating the flow，the valves play an important role. With the rapid development of the valve's usage, the types of valves are becoming diverse. Gate valves and globe valves are two typical valve types among them. So what are the differences between these two kinds of valves? Regarding the gate valve, when the valve opens and closes, the stem of the valve will move along with the wedge. This type is rising stem gate valve. Through the slot on the valve body and the nut on the top of the valve, the rotation movement is turned into the straight-forward movement with the help of the acme thread on the stem, thus making the operating torque to become operating thrust. Glove Valves: The globe valves can be used to cut and throttle the fluid. As a kind of typical cut-off valve, the sealing performance can be accomplished by exerting torque on the valve stem which will make pressure on the disc in axial direction, then the sealing face and the seat face will touch tightly to avoid the leakage of the fluid through the sealing parts. Advantages and disadvantages Regarding the gate valves, flow resistance is smaller, because channel in the eternal body is direct and straight. Different from the globe valves, the movement of the wedge in the gate valve is axis to the flow of fluid when opening and closing. But the disadvantage is that the sealing face will easily have erosion and abrasion so the maintenance will be difficult. The size is big, thus the opening of it needs more space and time. Globe valves: the structure is simpler, the maintenance and repair are easier. The sealing face is not easily eroded. The sealing performance is good! The maintenance procedures: The maintenance of the gate valve is not suitable to operate in the pipeline site. Under this circumstance, the valves and pipes which are welded together is prior to use globe valves. The operators don't need to dismount the globe valves from the pipes. The characteristics of the gate valves and globe valves are quite clear according to the analysis of the advantages, structures and maintenance procedures. With the development of the economy and industry, choosing the suitable type of valves are very significant.
Top entry ball valve is mainly used in pipeline and industry system. It has top entry and on line maintenance function and many other advantages, such as small fluid resistance, simple structure, small volume, light weight, reliable sealing, convenience for operation and maintenance, quick and flexible opening and closing. Top entry series ball valve with trunnion mounted ball, which is ground, polished and hard face treated on the surface. The ball and stem is integrated, sliding bearing is installed on the external bore so that the friction radius is small and operation torque is very low. It is possible to remove the bonnet of the Top-entry valve allowing free access to the body cavity without dismantling the valve from the line. A set of special maintenance tools permits to take out both ball and seat-rings; this maintenance operation requires very little space around the valve, thus allowing it in areas where space is a limiting factor. Top Entry construction is available in forged or cast execution, one piece symmetric body closed by a bolted bonnet. The range includes both full and reduced bore, pressure ANSI class from 150 to 2500 , with all possible combination of ends connections: flanged (RF-RTJ), butt welding and HUB ends.
