The regulation regulation and principle of electric valve valve commodity export quota increases year after year
The electric valve is mainly used in the adjustment of the total flow of liquid and steam daily air system software pipeline. The electric valve structure can be divided into two parts, the upper half is divided into electric actuator, the lower half is divided into the valve.
The actual operation of the electric actuator to control the valve posture, complete the opening and closing of the valve, and then realize the material in the pipe power switch or adjustment. The electric actuator of the electric valve is generally composed of three-phase asynchronous motor, transmission gear reducer, distance limiting organization, manual type and automatic conversion organization, opening indicator and electrical components. Valve motor output power is generally 0.37 ~ 5.5kW.
In order to ensure the reliable power switch of the electric valve, the over-voltage protection is strictly regulated. The common protection measures are electrical equipment type and pedal type. DL type current relay is used as overvoltage protection for electrical equipment maintenance. Pedal maintenance uses a gear limit for over – voltage protection.
1. Control rules
The regulation of the electric valve is: press the open valve button, the valve is opened, press the close valve button, the valve is closed. When the valve is fully open or closed, the stroke arrangement control organization will automatically disconnect the ac contactor control circuit, and access the valve is fully open or closed signal indicator light. DL type current relay is used for maintenance when the power circuit is blocked and overloaded in the process of opening or closing. There is an electrical interlock between the open valve ac contactor and the close valve contactor.
There is also a pedal-operated route with double overtorque maintenance and valve opening monitoring equipment.
2. The principle of
Connect the switch power supply, the indicator light is on.
Hold open the valve keys, electromagnetic contactor coil plug, ac contactor closed the main point of contact, and the motor is turned, the valve opens, at the same time relay and time controller plug, small small relay closed normally closed point, and locking current relay normally closed point, avoid excessive running electrical flow to locking current relay error operation. When the delay time of the time controller reaches, the delay contact point is broken, and the power supply of the small relay is turned off. The locking effect is started by the normally open and normally closed of the locking current relay and the normally closed point of the AC contactor. When the valve is fully open, press the travel switch, the AC contactor turns off the power, the motor turns to stop, and at the same time, the valve is fully open and the light is on.
Press the button to close the valve, the solenoid coil of AC contactor is plugged, the main contact point of AC contactor is closed, the motor turns over, and the valve is closed. Small relays and time relays operate with the opening valve. When the valve is closed, press the travel switch, the AC contactor turns off the power, the motor turns off, and at the same time the valve is closed, the display light is on. Note the following when using the time controller: The time delay of the time controller is generally 3 to 5S. If no time controller is configured, increase the time for pressing a button.
The export quota of valve commodity increases year after year
Valve requirements has been in international environment, for environment, its harm is very big, China’s valve field should calmly, improve their ability to import and export trade risk communication, especially of relatively low technical requirements of the medium generality valve products, engaged in many company, product homogeneity is more serious, overproduction, decreasing profit level, Many valve companies have been based on the expansion of export in order to survive, valve commodity export quota with gradual growth.
From January to June in 2013, Wenzhou, a key valve production place in China, exported 8109 batches of valve products, with a year-on-year growth of 0.61%, and the export quota of 260 million US dollars, a year-on-year decrease of 2.98%, a continuous decline, and in 2012, 1-6 Wenzhou valve export quota increased to 42%, the data information gap is large, It can be seen that the valve requirements are more harmful to the global economic environment.
To expand exports are not the panacea processing valve industry development predicament, also hard to avoid some problems through look glamorous export data information show slowly: many valve export company for the expansion itself export market share, from China’s market price competition countermeasure, malignant price competition continues to increase. Many small – and medium-sized companies are competing on price in order to obtain international order information. However, some small and medium-sized enterprises in the lower product price to obtain overseas orders, in order to better control the cost, usually shoddy. As a result, the finished products are not qualified and the credibility of China’s valve parts industry chain is jeopardized. ** Horror is that over time, China’s valve parts industry chain is also likely to suffer trade protection in the world market.
At this stage, valve exports are mostly cleared in DOLLARS, and the exchange rate risk caused by the appreciation of the RENMINBI is also adding fuel to the fire. Some valve manufacturers do not have solid product quality, fake and shoddy, harm the income of the same industry in China and the brand image of China’s valve export commodities. Regret, resulting in the valve field export gross margin continued to reduce.
In 2013, Chinese valve companies encountered export pressure to expand the situation, valve companies should strengthen innovation technology, from focusing on the total number, the expansion of business scale to pay more attention to the pursuit of perfect quality, economic benefits, and actively develop China’s sales market, promote the reasonable development trend of China’s valve field. And subject to the technical requirements of other small and medium-sized valve companies, can take into account the new segmentation industry, such as heating water separator valve demand, improve the capacity of engineering projects supporting facilities, enhance the added value of the valve.
Global economic recovery must still be a slow process, valve requirements by the global economic environment is relatively large, China’s valve field should calmly respond to improve the ability to communicate the risks of import and export trade, in the expansion of export at the same time, also can not release pressure on the development of China’s sales market. The premise of the company can carry out industrial structure upgrading, to the top valve commodity industry to forge ahead, such as crude oil, nuclear power plants and other national key development industries, imported valves domestic alternative market size can not be ignored.
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Post time: May-10-2022