How to correctly choose the right inlet valve solenoid valve, solenoid valve types, maintenance, maintenance, overhaul

How to correctly choose the right inlet valve solenoid valve, solenoid valve types, maintenance, maintenance, overhaul

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Import valve key is derived from foreign well-known brand valves, mainly European and American countries, Japan’s well-known brands, is a symbolic sign have sent her in the United States, the French force, LIT, Japan north jersey KITZ, the UK, a RETZ, valve type primary products are imported ball valve, cut-off valve imports, import control valve, imported disc valve, Imported pressure regulating valve, imported solenoid valve, and commodity specifications, working pressure, ambient temperature, materials, interface, practical operation methods and other main parameters many, must be in accordance with the specific must, the characteristics of goods to select the appropriate valve; In this paper, the fusion of the customer five-star praise of the German brand France LIT, analyze the actual model selection of imported valves:
A, the characteristics of the imported valve application characteristics and structural characteristics
1, the application characteristics of imported valves
The key performance indicators and application categories of the valve are defined in the application characteristics of the valve: valve type (cable digital TV valve, adjusting valve, safety valve, etc.); Product type (globe valve, globe valve, disc valve, valve, etc.); Raw materials of key valve parts (oil circuit plate, single flow valve, seat, piston valve, protruding surface); Valve transmission system method, etc.
2. Structural characteristics
The structural characteristics of the valve assembly, maintenance, maintenance and other ways of some structural characteristics, belonging to the structural characteristics are: the size of the valve structure and the overall relative height, and the connection with the pipeline (flange connection, flange connection, clamp connection, external flange connection, electric welding welding end connection, etc.); Protruding way (insert ring, outer thread ring, spray welding, spray welding, oil circuit board itself); Seat structure (rotating rod, electric push rod), etc.
Two, the selection of valve process
Establish the main purpose of the valve in the facility or equipment, specify the valve operating standards: applicable medium, pressure, operating temperature, etc.; For example, to select a French LIT cut-off valve, make sure the medium is steam, the principle is 1.3Mpa, operating temperature is 200℃.
Make clear the nominal diameter of the pipe connecting with the valve and the way of interface: flange, external thread, electric welding, etc. For example, select the inlet of the cut-off valve, determine the interface is flange.
Clear the actual valve operation method: manual, electric, electromagnetic induction, pneumatic or hydraulic control valve, hydraulic push rod linkage, etc. For example, the manual stop valve is selected.
According to the medium, pressure and operating temperature of pipeline transmission, the raw materials of the shell and main parts of the valve are clearly selected: cast steel, carbon steel, stainless steel plate, carbon steel, stainless steel acid resistant steel, gray cast iron, malleable cast iron, ductile iron, alloy copper, etc. For example, the steel casting material selected by the cut-off valve.
Select the type of valve: cable digital TV valve, adjustment valve, safety valve, etc.
Clear valve form: globe valve, globe valve, valve, disc valve, one-way throttle valve, valve, pressure regulating valve, steam trap, etc.
Clear the main parameters of the valve: for automatic valves, according to the different must first clear allowable fluid density, discharge capacity, back pressure type, etc., and then clear the nominal diameter of the pipeline pipe diameter and the aperture of the high-pressure gate valve hole;
Make clear the main parameters of the selected valve: the length of the structure, flange connection and specification, the specification of the relative height of the valve after opening and closing, the size and total number of connected anchor bolt holes, all valve appearance specifications, etc.
The use of original materials: valve catalogue, valve sample selection of appropriate valve products.
Three, choose the basis of the valve
The main use of the valve, the application of working standards and control methods;
Working medium characteristics: pressure, operating temperature, corrosion, is not with solid particles, medium is not harmful, is not inflammable, flammable and explosive medium, medium viscosity, etc.; For example, want to choose France LIT imported solenoid valve, medium and natural environment flammability, flammable and explosive, generally choose explosion-proof solenoid valve; For example, to select the Valve LIT in France, the medium with solid particles, generally choose V type hard sealing ball valve.
The provisions of valve liquid characteristics: fluid density, discharge capacity, total flow characteristics, sealing level, etc.;
Assembly specifications and size requirements: nominal diameter pipe diameter, connection structure and connection specification, size or net weight limit with the pipeline;
Additional provisions on the stability of valve products, life and fire protection characteristics of intelligent equipment, etc. (Note when selecting the main parameters: If the valve is to be used for the purpose of operation, be sure to specify the additional main parameters as follows: Operation steps, the small total flow of diamond, the normal flow of gas pressure, gas pressure when closing, the valve of the small inlet of diamond working pressure).
According to the above selection of the valve according to the process, effective and appropriate selection of valves also need to carry out in-depth analysis of the structure of a variety of types of valves, easy to choose the valve to make an accurate choice of priority.
The final control of the line is the valve. The valve open and close parts control the medium in the pipeline into the method, the valve through the flow channel so that the valve has a certain total flow characteristics, in the selection of pipeline system software suitable assembly of the valve need to consider this point.
Summary, model selection several major factors: clear to choose what role of the valve, determine the medium ambient temperature, working pressure, determine the valve data flow and its necessary specifications, determine the valve material, the actual operation method; Solenoid valve, solenoid valve types, maintenance, maintenance, overhaul
First, scope of application
The liquid in the pipeline must be consistent with the medium marked in the model specifications of the solenoid valve series.
The temperature of the liquid must be lower than the calibration ambient temperature of the solenoid valve. Solenoid valve allows liquid viscosity generally below 20CST, more than 20CST should be marked. Pressure difference in the work, the highest pressure difference in the pipeline is less than 0.04mpa to choose such as ZS,2W,ZQDF,ZCM series products and other direct mobile and phased direct mobile; The lowest working pressure difference is greater than 0.04mpa, can choose the leading type (pressure difference) solenoid valve; Maximum working pressure difference should be lower than the solenoid valve maximum calibration working pressure; The general solenoid valve is all unilateral work, so we should pay attention to whether there is a backpressure difference, if there is an assembly of the cut-off valve.
Liquid cleanliness is not high should be assembled in front of the solenoid valve filter device, liquid gas solenoid valve on the medium cleanliness is better. Pay attention to the total flow diameter and take over specifications; Solenoid valve generally only power switch two control; The standard allows the assembly of bypass pipe, which is conducive to maintenance; Water hammer phenomenon to customize the solenoid valve opening and closing time adjustment. Pay attention to the harm of the working temperature on the solenoid valve: the current of the switching power supply and the output power consumption should be selected according to the output volume, the power supply voltage is generally allowed ±10%, be sure to pay attention to the high VA value when the communication is started.
Ii. Stability
Solenoid valve is divided into normally open normally closed and open and closed two; Generally choose normally closed type, plug open, off power off; But in the open for a long time to close the very short time to choose the open and closed type.
Life test, processing plants generally belong to the new type of inspection project, to be precise, there is no professional specification of solenoid valve in Our country, so the selection of solenoid valve manufacturers cautious.
Posture time is very short when the working frequency is high, the general choice of straight mobile, large diameter selection of rapid series of products.
Three, safety factor
General solenoid valve is not moisture-proof, in the standard does not allow you to choose moisture-proof type, processing plants can be customized. The solenoid valve must exceed the maximum working pressure in the pipeline, otherwise the service life will reduce or cause other accidents. Corrosion liquid should be selected all stainless steel plate type, strong corrosion liquid should be selected plastic King (SLF) solenoid valve. The natural environment must choose the corresponding explosion-proof equipment.
Iv. Rationality
There are a lot of solenoid valves can be universal, but in order to achieve the above three basic should choose the most economic development of goods.
The basic principle of the construction of solenoid valve
A straight mobile solenoid valve
There are normally closed type and open and closed type two. When the electromagnetic coil is connected to the power supply, the magnetic field force is caused, so that the moving iron core gets rid of the torsion spring force and the static iron core is sucked immediately open the valve, and the medium is a channel; When the electromagnetic coil power failure when the magnetic field force fade, the moving iron core in the torsion spring force under the action of calibration, immediately shut off the valve, medium blockage. Simple structure, reliable posture, in zero pressure difference and micro vacuum pump under normal work. On and off are exactly the opposite. Such as less than φ6 flow diameter solenoid valve.
Two, phased direct mobile solenoid valve
The valve selection of a valve and two open valve connected in one, distribution valve and proportional pressure reducing valve stage magnetic force and pressure difference immediately open distribution valve port. Caused when electromagnetic coil processing power, make the moving iron core and static iron core and magnetic field force, proportional pressure reducing valve mouth open and proportional pressure reducing valve was built on the distributing valve mouth, mouth and moving iron core and the main valve core together, then work on the distributing valve cavity pressure according to the proportional pressure reducing valve pressure relief, in the pressure differential and under the effect of magnetic field strength at the same time to make up the main valve core fitness, Open the distribution valve medium commodity circulation. When the electromagnetic coil power failure when the magnetic field force fade, then the moving iron core in its own weight and torsion spring force under the action of the proportional pressure reducing valve hole, then the medium in the balance hole into the main valve cardiothoracic cavity, so that the upper chamber working pressure rise, then under the effect of torsion spring calibration and load off the distribution valve, the medium off line. Good construction, good posture, good work at zero differential pressure. For example: ZQDF, ZS, 2W, etc.
Three, indirect leading solenoid valve
The solenoid valve is composed of liquid control valve and main valve with a safety channel; Normally closed type is turned off when the power supply is not connected. When electromagnetic coil processing power, caused by the moving iron core and static iron core and magnetic, proportional pressure reducing valve mouth open, medium into the inward and outward, at this time the main valve thoracic abdominal cavity pressure is reduced, less than the import side of work pressure, producing pressure difference to get rid of the torsional spring up frictional resistance and with exercise, do open the aim of distributing valve mouth, medium circulation of commodities. When the electromagnetic coil power failure, magnetic fade, the moving iron core under the action of torsion spring force calibration off the main mouth, then the medium injected from the balance hole, the main valve cardiothoracic cavity working pressure expanded, and under the action of torsion spring force down fitness exercise, close the distribution valve mouth. The usual open basic principle is reversed. Such as: SLA, DF (φ15 above specification), ZCZ and so on.


Post time: May-18-2022

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