On February 27, Yang Chuantang, Minister of the Ministry of Transport, presided over a ministerial meeting to listen to reports on the implementation of the 2015 national transport work conference in various localities, and reviewed and approved the “Regulations on the Supervision and Administration of Railway Dangerous Goods Transport Safety†and “Railway Construction. Engineering Quality Supervision Regulations.
The meeting pointed out that earnestly grasping the implementation of the decisions of the Party Central Committee and the State Council in all decision-making and national transportation work conferences will be one year harder than in a year, and that the development situation will be better every year. The national transportation system must focus on its work, and do a good job in all aspects of transportation in accordance with the strategic layout of "completely building a well-to-do society, comprehensively deepening reform, comprehensively governing the country according to law, and fully governing the party strictly." The first is to speed up the reform and implement various reform opinions and measures. The second is to insist on the development of the top priority and implement all policies and measures for stabilizing growth. The third is to strengthen the construction of the rule of law, promote the administration according to law, and advance the modernization of governance systems and governance capabilities. The fourth is to strive to improve management capabilities and management. Fifth, continue to maintain a good momentum of change in the style of work and ensure that all policies and measures take root.
The conference stressed that this year's transportation and economic development has started well, but at the same time it faces the challenges of increasing economic downward pressure and many unforeseen factors. The task of transportation reform and development is still heavy. It is necessary to study new situations and solve new problems; strengthen work style construction, attach great importance to situation analysis and policy research, strengthen the demonstration of major reform programs, major decision-making, major projects, clearly divide labor, and implement responsibilities; earnestly carry out inspections and implement special actions to ensure Major decision-making arrangements and various initiatives have been put in place to ensure that new achievements are made every year.
The meeting reviewed and approved the "Regulations on the Supervision and Administration of Railway Dangerous Goods Transportation Safety" and the "Rules on the Supervision and Administration of Railway Construction Engineering Quality." The Provisions on the Supervision and Administration of Railway Dangerous Goods Transport Safety combine the speciality and successful experience of railway dangerous goods transportation, standardize transportation conditions, strengthen source supervision, implement main responsibilities, strengthen process control, define government responsibilities, and regulate law enforcement behaviors, and promote the railway industry. Safe and continuous development is of great significance. The Regulations on the Supervision and Administration of Railway Construction Engineering clearly clarified the main body of project quality supervision and its responsibilities, detailedly clarified the quality responsibilities of the railway construction and construction units, clarified the main issues and responsibilities for the investigation and handling of the quality accidents of railway projects, and proposed the supervision of railway construction projects. Work requirements.
The meeting also studied other matters.
Department leaders and department chiefs attended the meeting. Responsible comrades of relevant departments and bureaus of the State Railway Bureau attended the meeting.
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The details are as follow,.
1. Security:
1.1 Corrosive media: the choice of plastic valve solenoid valve and stainless steel; for the corrosive medium must use isolation diaphragm. Example CD-F.Z3CF. Neutral medium, copper alloy should also be used as the valve material of the solenoid valve, otherwise, the valve shell often rust off, especially when the action is not frequent. Ammonia valves can not use copper.
1.2 Explosive environment: you must choose the appropriate level of explosion-proof products, open-air installation or dust should be more occasions use waterproof, dustproof varieties.
3, the nominal pressure solenoid valve should exceed the maximum working pressure in the tube.
Second, the applicability:
2. Media characteristics
2.1 The gas, liquid or mixed state were selected different types of solenoid valve, such as ZQDF for air, ZQDF-Y for liquid, ZQDF-2 (or -3) for steam, otherwise easy to cause malfunction. ZDF series of multi-function solenoid valve is available in the gas. Liquid. The best time to state the media state, the installation users do not have to adjust.
2.2 Different medium temperature product specifications, or the coil will burn, seal aging, seriously affect the life of life.
2.3 Medium viscosity, usually below 50cSt. If more than this value, diameter greater than 15mm with ZDF series of multi-function solenoid valve for special order. Path less than 15mm set high viscosity solenoid valve.
2.4 Media cleanliness should be equipped with a recoil filter valve in front of the solenoid valve, the pressure is low fashion can choose direct acting diaphragm solenoid valve for example CD-P.
2.5 If the medium is directional and does not allow backflow ZDF-N and ZQDF-N need to be used in both directions, please make a special request.
2.6 medium temperature should be selected within the allowable range of the solenoid valve.
3. Pipeline parameters
3.1 According to the requirements of medium flow and pipe connection options valve port and model. For example, the small diameter selection CA5 and Z3F for one pipe to two pipes, ZDF-Z1 / 2 for medium or large diameters. Another example is the control of the convergence of two pipelines, please choose ZDF-Z2 / 1.
3.2 According to the flow and the valve Kv value selected nominal diameter, but also optional with the pipe diameter. Please note that some manufacturers are not marked with Kv value, often the size of the valve hole is smaller than the interface diameter, must not be greedy price low and misleading.
3.3 working pressure
Minimum working pressure differential above 0.04Mpa is optional indirect pilot; Minimum working pressure close to or less than zero must be used direct or step direct.
4. Environmental conditions
4.1 The maximum and minimum temperature of the environment should be selected within the allowable range, if any special orders for overcommitment proposed.
4.2 Ambient high relative humidity and rain drops and other occasions, the election should be waterproof solenoid valve
4.3 The environment often vibration, bump and impact occasions should choose a special variety, such as marine electromagnetic valve.
4.4 In a corrosive or explosive environment should give priority to use according to the safety requirements of corrosion resistance
4.5 If the environmental space is limited, please use multi-function solenoid valve, because it eliminates the need for bypass and three manual valves and easy on-line maintenance.
5. Power conditions
5.1 According to the type of power supply, were selected AC and DC solenoid valve. In general AC power access convenience.
5.2 Voltage specifications exhausted preferred AC220V.DC24V.
5.3 Power supply voltage fluctuations are usually used in the exchange of +% 10% .- 15%, DC allows ±% 10 or so, if ultra poor, to take measures to stabilize the voltage or make special order requirements.
5.4 should be selected according to the power capacity of the rated current and power consumption. Should pay attention to AC starting VA value is higher, in the lack of capacity should be preferred indirect induction solenoid valve.
6. Control accuracy
6.1 Ordinary solenoid valve only open and close two positions, when the control accuracy is high and the parameters are stable, please use multi-position solenoid valve; Z3CF three-position normally open solenoid valve with micro-flow, full-flow and shut. ZDF-Z1 / 1 combination of multi-function solenoid valve with full open, big open, small open, full open four flow.
6.2 Operating time: refers to the electrical signal is turned on or off to the completion of the main valve action time, only the company's patented multi-function solenoid valve can be opened and closed separately adjusted, not only to meet the control accuracy requirements, but also to prevent water hammer damage.
6.3 leakage
The sample given the amount of leakage for the common economic level, if too high, please make a special order.
The reliability:
1, working life, this is not included in the factory test project, a type test project. In order to ensure the quality of regular manufacturers should be selected brand-name products.
2, work standard: long-term work system, repeated short-term work system and short-term work system three. The Company's conventional products are long-term working system, that is, the coil allows long-term power work. For a long time to open the valve only a short time off, it should be used normally open solenoid valve. Used in the short-term work volume and volume again
Large, special orders can be made to reduce power consumption.
3, the working frequency: high frequency of operation, the structure should be preferred direct-acting solenoid valve, the power to listen to the preferred exchange.
4, action reliability
Strictly speaking, this test has not been formally included in the professional standards of our solenoid valves, to ensure that the quality should be selected regular manufacturers of brand-name products. In some occasions, the number of actions is not much, but the reliability requirements are very high, such as fire protection, emergency protection, must not be taken lightly. Particularly important, you should also take two double insurance.
Fourth, economy:
It is one of the criteria used, but must be based on a safe, applicable and reliable economy.
Economy is not only the selling price of the product, but also the priority given to its function and quality as well as the cost of installing maintenance and other accessories.
More importantly, the cost of a solenoid valve in the entire automatic control system in the entire automatic control system and the production line is minimal, if you seek a cheap and missed the early damage caused by the group is huge.
Direct-acting solenoid valve:
Principle: When power is on, the electromagnetic coil generates electromagnetic force to lift the closing piece from the valve seat and the valve opens. When the electric power is off, the electromagnetic force disappears. The spring presses the closing piece on the valve seat and the valve closes.
Features: In vacuum, negative pressure, zero pressure can work normally, but the path generally does not exceed 25mm.
Main products involved in the Hydraulic Pump valve (solenoid valve, piston pump fist products), industrial products, drive modules, servo motors, programmable logic controller PLC, CNC transmission, sensors, power supplies, pneumatic components, industrial instrumentation. Specific main business brands and products are as follows:
Bosch Rexroth rexroth large quantities of industrial hydraulic pneumatic components (solenoid valve, throttle, check valve, proportional valve, servo valve, safety relief valve, flow control valve, pressure reducing valve, regulating valve, pressure relay, proportional amplification Plate, amplifier, axial piston pump, vane pump, gear pump, servo drive, servo motor, pneumatic components, pneumatic valve, cylinder, etc.),
Some series Model:
Solenoid valve: 4WE6, 4WE10, 4WE16; electro-hydraulic valve: 4WEH10H, 4WEH16, 4WEH25.
Check Valves: S10A, S20A, Z1S, Z2S, SL10, SL20, SV10, SV20, RVP, Cartridge Valves: LC, LFA
Relief valve: DB, DBW, DBET, DBD, ZDB, Z2DB, pressure reducing valve: DR6DP, DR10DP, ZDR6, ZDR10, DR-4X, DR-5X
Throttle valve: Z2FS6, Z2FS10, Z2FS16, Z2FS22; Speed control valve: 2FRM5, 2FRM10, 2FRM16,
Balance Valve: FD12FA, FD12PA, FD12KA, FD16FA, Relay: HED80, HED40, Electronic Unit: VT, 0811
Proportional Directional Valves: 4WRA, 4WRAE, 4WRE, 4WREE, 4WREEM, 4WRH, 4WRZ, 4WRZE, 4WRKE, 4WRBKE, 4WS2EM
High Frequency Directional Valves: 4WRPH, 4WRPEH, 5WRP, 5WRPE, 4WRREH, 4WRP, 4WRPE, 4WRP (E) H, 4WRSE, 4WRSEH, 4WRPNH, 4WRL, 4WRLE, 4WRVE, 4WRGE, 4WRL, 4WRLE, 4WRDE, 3WRCBH, Servo System : HAS, HNL, HCS, HNL
Piston pump: A4VSO, A10VSO, A2FO, Dosing motor: A2FM, A4FM, A10FM / E, Gear pump: 0510, AZPF, Vane pump: PV7
Atos ATOS and Dupuoma DUPLOMATIC Italy, the United States Parker Parker and EATON VICKERS Eaton Vickers hydraulic, Japan YUKEN Yuken pump valve advantage spot series (solenoid valve, pressure switch, piston pump, gear pump, the ratio Valve, globe valve, switch valve, etc.)
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