In our location,manufacturer of stainless steel ball valve are mainly located in Cang County or Haixing County of Cangzhou City, Hebei Province, China。
If want to buy stainless steel ball valve lower, customers would better buy it from China markets, and from Manufacturing factory.There are many manufacturers of stainless steel valves. They are cheap to go to Wenzhou city to buy, and the quality is good to buy in Jiangsu and Hebei province.
The premise is to see what kind of occasions you use, materials, seals, leak levels, etc. should be considered comprehensively, according to the use of the right valve.
The general ball valve does not indicate the direction and can be installed casually. It is reasonable to say that the ball valve has no direction, but in actual installation, in order to prevent excessive leakage between the valve body and the valve cover, the ball valve body is generally connected to the direction of the tank or material. Some ball valves are directional, generally there are marks of direction on the ball valve, if it was installed conversely, then will achieve a bad seal results. The ball valve is divided into a one-way sealing ball valve and a two-way sealing ball valve. The former has directionality. If the installation is reversed, the sealing under the complete pressure difference cannot be guaranteed, and the latter has no directivity. If the manual ball valve is not oriented, but if it is also control valve, it is directional. V-type ball valves and eccentric hemisphere valves are directional, and generally the medium flow direction mark is marked on the valve body. The floating ball valve and the fixed ball valve are two-way, and the eccentric hemispherical valve, the V-shaped ball valve, and the poppet-type track ball valve are unidirectional. The ball valve has an O-ball valve and a V-ball valve.
Ball valve (the ball valve should be a stop valve in the oceaneering andship domain fields), refers to a kind of valve which open or close by turning the ball with a hole on it. The standard GB/T21465-2008 "Valve Terminology" is defined as: the opening and closing member (sphere) is driven by the valve stem and rotates around the square ball valve as the axis for rotary motion. It can also be used for the adjustment and control of fluids. The hard-sealed V-ball valve has a strong shear force between the V-shaped core and the metal seat of the hard facing alloy. It is especially suitable for fiber-containing, tiny solid particles medium. The multi-way ball valve not only can flexibly control the switching of the merge, split, and flow directions of the medium, but also can close any channel and connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. Ball valve classification: pneumatic ball valve, electric ball valve, manual ball valve.
1.1 Preparation before installation
(1) The pipeline before and after the ball valve is ready. The front and rear pipes should be coaxial and the two flange sealing surfaces should be parallel. The pipe should be able to withstand the weight of the ball valve, otherwise the pipe must be equipped with appropriate support.
(2) Purge the front and rear lines of the valve to remove oil, welding slag and all other impurities from the pipe.
(3) Check the sign of the ball valve and find out that if the ball valve is intact. The valve was fully opened and closed several times to confirm that it was working properly.
(4) Remove the protective parts on the connecting flanges at both ends of the ball valve.
(5) Check the valve hole to remove any dirt that may be present, and then clean the valve hole. Even small particles of foreign matter between the seat and the ball may damage the seat sealing surface.
1.2 Installation steel ball valve
(1) Install the valve on the pipeline. Any end of the valve can be mounted on the upstream end. Valves driven by the handle can be mounted anywhere on the pipe. However, ball valves with gearboxes or pneumatic drives should be installed upright, that is to install on horizontal pipes, with the drive above the pipe.
(2) A gasket is installed between the valve flange and the pipeline flange according to the piping design requirements.
(3) The bolts on the flange should be tightened symmetrically, successively and evenly.
(4) Connect the pneumatic line (when using a pneumatic drive).
1.3 Post-installation inspection(1) Operate the drive to open and close the ball valve several times. It should be flexible and free of stagnation, and it is confirmed that it is working normally.
(2) Check the sealing performance of the flange joint between the pipe and the ball valve according to the pipeline design requirements.
Stainless steel ball valves just need operation of rotating 90 degrees of and a small turning torque to close tight. The fully equal valve body cavity provide the medium a straight-through flow path with a small obstruction. The main features of the ball valve are its compact structure, easy to operate and maintain. The stainless steel ball valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The ball valve body may be integral or combined. This type of valve should generally be installed horizontally in the pipeline. Stainless steel ball valve can be divided into stainless steel pneumatic ball valve, stainless steel electric ball valve, stainless steel manual ball valve. Material of Stainless steel ball valve include SS304, SS316 and SS321.
Stainless steel ball valve Working principle:The ball valve works by rotating the valve plug to make the valve unblocked or occluded. The ball valve switch is light in weight, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and the spherical surface are often closed, and is not easily eroded by the medium, and is widely used in various industries.
The ball valve and the plug valve(cock valve) are the same type valve, only the closing member of which is a ball, and the ball rotates around the center line of the valve body to open and close a valve.
The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. Ball valves are a new type of valve that is widely used.
Advantages of stainless steel ball valve:1. The fluid resistance is small, and its resistance coefficient is equal to the pipe length of the same length.
2. Simple structure, small size and light weight.
3. Tight and reliable, the sealing surface material of the ball valve is widely used in plastic and has good sealing performance. It has also been widely used in vacuum systems.
4. It is easy to operate, and it can be opened and closed quickly. It can be rotated by 90° from full opening to full closing, which is convenient for long-distance control.
5. Easy maintenance, the ball valve has a simple structure, the sealing ring is generally active, and it is convenient to disassemble and replace.
6. When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.
7. Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure.
Ball valves have been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rocket and other departments, as well as people's daily lives.
In China market, normally the heavy type stainless steel ball valve are from North factories, the compact type are mostly made by south plants. So if you more care about the price and have lower budge, then you can consider the compact type ball valve, in short time there is no much differences between heavy type and compact type, but maybe 5-6 years later then you can find that the compact stainless steel ball valve need to be replaced by a new one, while the heavy ball valve are still good enough to performance its all functions in your plumbing.
Meanwhile I suggest customers to buy the stainless steel ball valve from a big factory. Even some small mills can also make stainless steel ball valve, but most of theirs finished product more or less will have some flaws, for example there is no deburring & shot blasting treatments or their treatment is not strict, their polishing is rough(not ideal). more over the size of final castings can not be correspond with their drawings.
Compared with forging process, castings process is to pour the stainless steel liquid into the molds, so if you have a higher requests for your parts, we advise you to make it by casting workshop not forging workshop.
You would better to purchase stainless steel ball valve from a big investment castings manufacturing factory.
With the development of the lost foam casting, people pay more attention to the lost foam casting. It is reported that the refractory material is the aggregate composition of the lost foam coating, a lot of variety of refractory materials, usually choose the following five:
The main components of zircon powder are ZrO2 and SiO2, namely, the zirconium silicate. Its high degree of fire resistance, is now used for lost foam casting the best one of the anti sand. Cast steel castings and large cast iron parts, the use of such refractory materials, can reduce the workload of the cleaning of the casting, to obtain a smooth surface of the castings.
The main component of quartz powder is SiO2. Because the quartz powder has different crystal form transformation under different temperature conditions, the volume change of the quartz powder is changed, thereby reducing the use value of the quartz powder. Generally used to cast columns of cast iron and aluminum, copper and other non-ferrous metal parts. The EPC is mainly used in small, so the common application of quartz powder.
Alumina is corundum powder, the main component is Al2O3. It is also a kind of excellent performance of refractory materials, can be used to cast steel castings and large cast iron parts.
Graphite powder is one of the refractory materials used in the production of cast iron. It has a high degree of fire resistance, but it is easy to be oxidized. Its thermal expansion coefficient is very low, generally within 50 x 10-7.
Kyanite refractoriness at 1800 degrees, and kyanite in high temperature 1100-1450 degree gradually transformed into mullite, mullite 1800 is still stable, 1810 degrees is decomposed into corundum. Kyanite has relatively low price, is the ideal substitute for mineral corundum materials.
Various mechanical and engineering structures are composed of a number of components. These components work to bear the role of the force, in order to ensure that the components in the working conditions and the use of life during the normal work, to meet the following requirements:
1. Have enough strength
It is a prerequisite for the normal operation of the component to ensure that the component does not occur under the external force, so the strength of the component is the ability to resist the damage under the action of external forces.
2. Have enough stiffness
The deformation caused by the member under the external force should be within the allowable limit. The capacity of the member to resist deformation under the action of external force, that is, the stiffness of the member.
3. Have enough stability
Some slender members (or thin-walled members) in the axial pressure to reach a certain value, will lose the original balance of the form and the loss of work ability, this phenomenon is known as instability. Stability refers to the ability of the component to maintain the balance of the original form.
The strength, stiffness and stability of the components are related to the mechanical properties of the materials used, and the mechanical properties of the materials must be determined by experiments. In addition, some practical engineering problems can not be solved by theoretical analysis, which must depend on the experimental methods.
The actual engineering structure in many load-bearing components such as bridges, automobile transmission shaft, the beam and column, the length of the size is far greater than the cross-sectional dimensions, this kind of component in the study of mechanics of materials, often referred to as a bar, all the centroid of cross section of the rod connecting line, called the axis for the bar, if the axis is a straight line, it is called straight rod; axis curve is called curved bar. Rod shape and size of all cross section are the same as with rod; different called variable cross-section bar. The mechanics of materials research uniform bar.
EPC coating is the role of support and protection to prevent infiltration of metal foam model, sand and sand, absorption and decomposition products and make the cavity formation and decomposition of gas through the coating, maintain the integrity of the foam model after evaporation, and keep the liquid metal heat will not soon be distributed. Therefore the use of EPC coating can reduce the surface roughness of EPC casting, to ensure the accuracy of the castings, reduce or prevent the casting sand, sand holes, porosity, permeability, cold insulation, metal casting, no carbon deposition defects. So the EPC coatings should have sufficient refractoriness, certain mechanical strength, proper insulation and thermal conductivity, suitable permeability and absorption liquid decomposition products, smooth surface, and not enough brushing performance and foam model of chemical reaction etc..
Function analysis of lost foam casting coating
Casting coating can prevent the penetration and thermochemical sticky sand, formation of castings improve the stiffness of EPC foam model, prevent buried type deformation, contribute to the decomposition of gas foam pattern heat rapid discharge effect, then disappear why EPC coating brought together so many functions, we will analysis from the following six aspects.
Lost foam casting coatings with these six characteristics
1. High strength and stiffness to prevent deformation and damage to the dry sand;
2. High refractory performance to prevent the casting of the casting surface sticky sand;
3. Excellent permeability, can be quickly derived from the appearance of gasification products;
4. Strong adhesion to prevent the production process of coating cracking or even off;
5. Good coating and hanging, can be used to facilitate the use of a certain thickness of the coating;
6. Good sintering and peel off, that is, after casting, forming the coating shell which is easy to peel off automatically, so as to obtain the surface finish.
Fan impeller wear and abrasive composition, particle size, concentration, shape, impact velocity, impact angle, gas chemical composition, properties, temperature and humidity and other factors. And the flow of gas inside the impeller is not uniform and accelerates the wear and tear. As to prevent the impeller wear measures: one is to reduce dust and corrosive gas into the fan, this must be the transformation of the fan operation system; two is to make local wear uniform wear, it needs to improve the wear resistance of the impeller. High hardness and good wear resistance can be used to improve the wear resistance of the impeller. This will not only bring difficulties to the impeller manufacturing process, but also from an economic point of view is not reasonable. Therefore, it is an economical and reasonable solution to improve the surface quality of the fan impeller, to weld or spray welding (spray) wear layer and to add a layer of lining board to the blade.
Coating anti abrasion coating
The main anti - wear coatings are resin anticorrosive and wear-resistant coating, rubber anticorrosive and wear-resistant coating, silica, water glass and ceramic anticorrosive and wear-resistant materials, etc..
In order to make the 890 wear resistant compound can be used on the impeller of the fan, we have carried out some experiments with the company of Chesterton. 890 wear resistant compound is a ceramic composite metal surface from abrasion for repair and protection, and combined with the wear resistance and the parent material force of this kind of compounds are good. But the 890 wear compound coating thickness must reach 6mm or more thick, this is not appropriate, the rotor some narrow channel or start more stringent requirements as a layer of wear-resistant liner to solve the fan impeller wear also exist such problems in leaves.
Surfacing of blade surface
Surfacing is the selection of a certain welding rod (or welding wire), manual arc (or automatic welding) welding in the blade easy to wear parts, to improve the quality of the blade surface, to protect the blade and improve the blade life. The blade surfacing electrode in general use D217, D237, D317B, D707 and D717, D217 and D237 belong to the Ma steel welding metal abrasion resistance, there is certain, but the welding crack tendency greatly. D317B surfacing material is composed of a large number of tungsten carbide (WC) is a kind of hardfacing alloy particle distribution formed on the metal substrate, the melting point of WC and the hardness is very high, so the weld metal hardness is very high hardness and impact resistance, HRC = 60, smaller crack tendency of surfacing metal. As for the D237 and D317B welding rod of our company in Ma'anshan Steel Corp sintering fan impeller has been carried out on the comparison test, the test results show that the D317B welding rod welding resistance to wear and impact resistance is better than D237. D217, D237 and D317B electrode has been successfully used in our company's sintering fan impeller, the use of the various steel companies are also good.
Surface spray welding (spray)
Spray welding process is a process that uses heat source to spray and melt on the surface of the work piece to form a dense spray welding layer. Wear resistance of the spray welding powder basically all is the use of Ni-Cr-B-Si series of nickel base spray welding powder. The spray welding layer basic organization is a solid solution of Ni-Cr-Fe, at the same time, there are a lot of boron compounds and tungsten carbide, the uniform distribution of WC particles in Ni based spray layer, these particles are uniform and discontinuous, but can form a hardness of HRC70 skeleton. Ni base material is filled in the skeleton, in the wear debris, can withstand high abrasive wear. Spray welding surface hardness is HRC55 ~ 70, the basic component is Ni60%+WC35%. My company in the two phase of the project in the application of the technology, and then in the Panzhihua Steel Corp, Steel Corp, Anshan, Ma'anshan Steel Corp, Steel Corp and other Steel Corp in the application, the use of good results. In 2001, also in the Wuhan Iron and Steel Corporation IDF rotor spray welding and partial spraying WC powder, the effect is good. Some nickel based powder and nickel based cemented carbide have been developed in Harbin Welding Research Institute.