Stainless steel valve pipe fittings Stainless steel valve grinding method has any special place?

Stainless steel valve pipe fittings Stainless steel valve grinding method has any special place?

Stainless steel valve fittings:
In the system pipe, pipe fittings, valves are actually a set of products. Generally speaking, in the whole pipeline, in addition to the straight pipe, all kinds of accessories can be collectively referred to as pipe fittings. However, it is customary for us to call elbow, tee, size head, pipe cap and various pipe joint diameters as pipe fittings, while flange, valve, expansion joint, pipe support, etc., respectively. Below, Taichen introduces some valve fittings manufacturers, standards, selection, classification, use and other knowledge in detail.
Valve fittings are carbon steel and stainless steel and cast steel, or other materials, in recent years with the improvement of people’s living standards, the demand for non-staple food requirements also followed by a large rise. Therefore, it drives the rapid development of food machinery, and the stainless steel sanitary valve fittings production industry is booming. People usually say that valve fittings, mostly use stainless steel sanitary valve fittings.
Stainless steel valve fittings standard:
There are many standards of stainless steel valve fittings, including GB (national standard), JB (Mechanical standard), HG (Chemical Industry standard), and ANSI (American standard), JIS (Japanese standard), DIN (German standard) and so on. However, the most commonly used standards can be divided into two categories: (1) the European system based on DIN standards (including DIN, GB, JB, HG20592); (2) American system based on ANSI standard (including ANSI, GB, HG20615). These two types of flanges can be distinguished by markings indicating flange pressure levels. (JIS is the standard of another class of systems, not this class)
Selection of stainless steel valve fittings:
1, determine the type of valve: gate valve, globe valve, ball valve, butterfly valve, throttle valve, safety valve, pressure reducing valve, steam trap, etc. Select the type of valve: closed circuit valve, regulating valve, safety valve, etc.
2, determine the parameters of the valve: for automatic valves, according to different needs to determine the allowable flow resistance, discharge capacity, back pressure, etc., and then determine the nominal diameter of the pipeline and the diameter of the seat hole;
3. Determine the geometrical parameters of the valve: structural length, flange connection form and size, the size of the valve height direction after opening and closing, the size and number of connecting bolt holes, the overall valve appearance size, etc.
4. Determine the nominal diameter and connection mode of the pipe connecting with the valve, and know which kind of connection is flange, thread, welding, etc.; Know what is the way to operate the valve, manual, electric, electromagnetic, pneumatic or hydraulic, electrical linkage or electro-hydraulic linkage?
5, according to the pipeline transmission medium, working pressure, working temperature to determine the shell and inner parts of the selected valve, choose the most suitable materials, common materials are: gray cast iron, malleable iron, ductile cast iron, carbon steel, alloy steel, stainless acid resistant steel, copper alloy, etc.
Use of stainless steel valve fittings:
Valves are divided into automatic valves and drive valves. Automatic valves (such as relief valves, pressure reducing valves, steam traps, check valves) rely on the device or pipeline itself to achieve the change of medium pressure to open and close. Driving valves (gate valves, globe valves, ball valves, butterfly valves, etc.) are driven by driving devices (manual, electric, hydraulic, pneumatic, etc.) to drive the control device or pipeline medium pressure, flow and direction. Due to the different pressure, temperature, flow and physical and chemical properties of the medium, the control requirements and use requirements of the device and piping system are also different, so the types and specifications of the valve are very much. Play is not complete statistics, I have valve product varieties have reached more than four thousand models, nearly forty thousand specifications, valves in economic life plays a very big role.
~ Solenoid valve  Solenoid valve is used to control the automatic basic components of the fluid, belongs to the actuator; Not limited to hydraulic, pneumatic. The solenoid valve is used to control the direction of hydraulic flow. The mechanical devices in the factory are generally controlled by hydraulic steel, so the solenoid valve is used. And in the general sense, the domestic solenoid valve manufacturers are not mainly to hydraulic solenoid valve, generally produce two two solenoid valve with ventilation fluid.
~ Ball valve  Ball valve and plug valve is the same type of valve, only its closing part is a ball, the ball around the center line for rotation to open, close a valve.
~ Butterfly valve  Butterfly valve is with the stem rotation of the circular butterfly plate as the opening and closing parts, in order to achieve the opening and closing action of the valve. Butterfly valve is mainly used with truncation valve, can also be designed to have adjustment or truncation and adjustment function. At present, butterfly valve is used more and more in low pressure and large diameter pipeline.
[Stop valve] Stop valve is a common truncation valve, mainly used to put through or truncate the medium in the pipeline, generally not used to adjust the flow. The globe valve is suitable for a wide range of pressure and temperature, but it is generally used for medium and small caliber pipelines.
[Reversing valve] Reversing valves mainly include electromagnetic reversing valve, manual reversing valve, electro-hydraulic reversing valve, four-way reversing valve, multi-way reversing valve, air-controlled reversing valve, five-way multi-way reversing valve, two-position two-way reversing valve and so on.
Check valve: Check valve is also called check valve or check valve. Used in hydraulic systems to prevent reverse flow of oil.
~ Electric valve  The electric valve is used as the power of the motor to open and close the valve, which is used for relatively large valves and advanced electric valves. It can be used for flow control on the process.
Valve fittings:
Shanghai Taichen Valve Factory specializes in the production, development and design of valves, always adhere to continuous scientific and technological innovation, has developed in line with international standards of high, medium and low voltage power station valves, gate valves, butterfly valves, ball valves, globe valves, check valves, regulating valves, sewage valves, plunger valves, and other products, and can design and manufacture special valves according to user requirements. The main material is QT450-10, WCB, WC1, WC6, WC9, ZGCr5Mo, ZG20CrMoV, ZG15CrMoV, CF8, CF8M, CF3, 12Cr1MoV, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti. Nominal diameter DN10 ~ DN4000mm: nominal pressure 1.0MPa~50.0MPa. The products are widely used in power station, petroleum, chemical industry, boiler, oil transmission, liquefied petroleum gas and other pipelines and various equipment, and exported abroad.
Classification of stainless steel valve fittings:
Pipe fittings are the parts that connect pipes into pipes. According to the connection method, it can be divided into socket pipe fittings, threaded pipe fittings, flange pipe fittings and welded pipe fittings. Often made of the same material as the pipe. There are elbows (elbow tube), flanges, three-way pipe, four-way pipe (cross head) and reducing pipe (size head), etc. A bend where a pipe turns; Flange is used to make the pipe and pipe connected to each other, connected to the end of the pipe, the three-way pipe is used for three pipes gathering place; A four-way pipe is used where four pipes are gathered together; Reducers are used where two pipes of different diameters are connected.
Pipe fittings are divided by purpose:
1. Pipe fittings used for connecting pipes are: flanges, loose joints, pipe hoops, clamps, clamp sleeves, throat hoops, etc
2, change the direction of the pipe fittings: elbow, bend pipe
3, change the pipe diameter of pipe fittings: reducing diameter (reducing pipe), reducing elbow, branch pipe, reinforcing pipe
4, increase the pipe fittings of pipeline branches: three, four
5. Pipe fittings for pipe sealing: gasket, raw material belt, thread hemp, flange blind plate, pipe plug, blind plate, head, welding plug
6. Pipe fittings for pipe fixation: clamp ring, tow hook, hanger ring, bracket, bracket, pipe clamp, etc
Pipe profile:
Pipe is the material used to make pipe fittings. Different pipe fittings should use different pipes, which directly determines the quality of pipe fittings. Construction projects, power plants, chemical plants and other multi-purpose this kind of pipe, has the implementation standard GB/T5310, used for high pressure boiler: has the implementation standard GB/T8163, seamless steel pipe for conveying fluid: has the implementation standard GB3087, seamless steel pipe for low pressure boiler: has the implementation standard GB/T9948, seamless steel pipe for petroleum cracking: Has the implementation of standard GB/T14976, stainless steel seamless steel pipe for fluid transmission, common materials are alloy (15CrMo, 12Cr1MoV) carbon steel (10#, 20#, 45#) stainless steel (304, 316).
Pipe is a necessary material for construction engineering, commonly used are water supply pipe, drain pipe, gas pipe, heating pipe, wire conduit, storm pipe and so on. With the development of science and technology, the pipe used in home decoration has also experienced the development of ordinary cast iron pipe ¡ÃƒÂº cement pipe ¡ú (reinforced concrete pipe, asbestos cement pipe) ¡ú ductile iron pipe, galvanized steel pipe ¡ú plastic pipe and aluminum-plastic composite pipe.
Pipe classification:
(1) Water pipe: galvanized steel pipe, copper pipe, aluminum-plastic composite pipe, ABS plastic pipe, polyethylene pipe, polypropylene pipe, etc.
(2) Drainage pipes: steel pipe, cast iron pipe, spigot type prestressed reinforced concrete pipe and spigot type self-stressed reinforced concrete pipe, GPR polyester resin pipe, HOBAS centrifugal casting glass fiber reinforced polyester resin pipe, polyethylene pipe, PVC plastic pipe, etc.
(3) Heating and gas pipes: galvanized steel pipe, CPVC plastic pipe, ABS plastic pipe, polyethylene pipe and so on.
(4) wire sleeve: magnetic tube, aluminum-plastic composite pipe and so on.
(5) rain pipes: iron pipe, cast iron pipe, aluminum plastic composite pipe, PE plastic pipe, etc.
What is special about the grinding way of stainless steel valve?
Stainless steel valve refers to the use of stainless steel materials made into the valve, in the food and biscuit industry, instant noodles and rice noodle industry, all kinds of frozen food dehydration line equipment, glass products industry, these industries are the existence of stainless steel valves. The valve is a control component in the pipeline fluid delivery system. It is used to change the channel section and the direction of the flow of the medium. It has the functions of diversion, cut-off, regulation, throttling, check, shunt or overflow pressure relief. Valves for fluid control range from simple globe valves to valves used in extremely complex automatic control systems in a wide variety of varieties and specifications.
Stainless steel valves can be used to control the flow of water, steam, oil, gas, mud, all kinds of corrosive media, liquid metal and radioactive fluid and other types of fluids. The working pressure of the valve can be from 0.0013MPa-1000MPa ultra-high pressure, and the working temperature can be from the first temperature of -269¡æ to the high temperature of 1430¡æ.
Stainless steel valve to the workpiece grinding is first of all to the grinding tool sanding, and then with the aid of abrasive particles and grinding liquid mixed composition of the abrasive agent to achieve the purpose of grinding processing. Grinding force refers to the force acting on the unit grinding surface area, which is applied to the tool and the force acting on the processed surface through the abrasive particles. If the pressure is too small, the grinding effect is very small. The increase of the pressure, the grinding effect will be enhanced, and the grinding efficiency will be improved. However, when the pressure increases to a certain value, the phenomenon of saturation appears, and the grinding efficiency generally reaches the peak. After that, if the pressure per unit area continues to increase, the efficiency decreases.
This is because the valve abrasive has a certain anti-pressure limit, when the limit is exceeded, it will be crushed, so that the abrasive finer, grinding self-reliance reduced. Therefore, the selection of unit pressure should be determined according to the strength and crushing characteristics of abrasive after the test, the following parameters should be generally selected:
In the rough grinding, white corundum abrasive, select 0.2-0.5MPa.
In the fine, cut the jade abrasive, select 0.03-0.12MPa.
Grinding speed refers to the speed of relative motion of the tool to the workpiece surface. Grinding speed is an important process parameter to control the amount of residual removal, removal speed and machining surface quality.
The function of the tool and its material tool is to make the abrasive agent temporarily fixed and obtain a certain grinding motion, and transfer its own geometry to the workpiece in a certain way. Therefore, the materials used for fabrication of research tools should have proper embeddedness of abrasive particles and maintain their geometric shape accuracy for a long time. Gray cast iron is an ideal material for making research tools. It has both hard and wear-resistant cementite and ferrite with good toughness and plasticity. It also contains graphite component, which plays a lubricating role and is easy to be formed and processed.