2017年9月30日星期六

Some Problems in China 's Valve Industry

Domestic hardware industry, the trend of outward development of the valve business is more obvious, many enterprises within the industry, but because of low cost and intense competition, most companies rely on lower prices to get the market, so that corporate profits are very low , Basically can only achieve the maintenance of production, but it is difficult to make money in the state, the consequences are low product prices, low added value, low profits, companies do not have enough funds to continue to develop.
In the macroeconomic continued to optimistic about the situation, the hardware valve industry, most of the production and sales indicators have maintained a rapid growth, but due to the impact of price war, industry sales revenue and profits fell sharply last year. But overall, stainless steel solenoid valve industry concentration is relatively low, mainly in the production of low-end products. In the core technology, the domestic enterprises and the developed countries in the world there is still a certain gap.
At present, China's valve industry is still there are some problems, such as China's valve enterprises mainly to low-level, small-scale, family workshop-based enterprises. In the product, due to repeated investment, the introduction of technology is not enough, China's leading enterprises of the valve products is still low-quality mass products. It is understood that the current production of various types of valves in China, there are widespread leakage, internal leakage, the appearance of quality is not high, short life, the operation is not flexible and the valve electric devices and pneumatic devices are not reliable and other shortcomings, some products only the equivalent of the last century The international level of the early 80s, some high temperature and pressure and key devices on the need for the valve is still dependent on imports.
China's valve industry in the industrial structure, industrial valve industry chain, as well as the degree of specialization of the industry and foreign enterprises there is a large gap between the domestic pneumatic flow control valve product quality is low because the rapid expansion of the market, the original state-owned enterprises have Turn off and turn. According to a large market survey of air conditioning and refrigeration, although a number of township enterprises to develop rapidly, but because the township enterprises starting low, technical strength is very weak, poor equipment, most of the products are imitated production, especially for the drainage of low-pressure valve problems The above problems do not affect the future prospects of China's valve industry. This is mainly due to the support of national policy and the strong demand of the valve product market, especially the construction of the West-East Gas Pipeline, West to East, South-North Water Transfer Project requires a large number of valve products.
Until recently, Chinese valve manufacturers were also limited to some less profitable target markets such as Ethiopia, Sudan, Iran, Iraq and some Southeast Asian markets. These markets are small, the decision-making process depends entirely on the price, profit margins are limited. China's import valve manufacturers must pay attention to the undeniable fact that if they want to survive in the future, they must improve the performance of the previous downturn, access to large export manufacturing profits. The main reason for the low export earnings is that there are a lot of business opportunities in China's domestic market, and the quality of China's imported valves is not enough to sell overseas.

2017年9月24日星期日

The reason why the pressure reducing valve can not be depressurized or depressurized

The regulator reduces the inlet pressure to a desired outlet pressure and relies on the energy of the medium itself to keep the outlet pressure automatically stable. If the pressure relief two way solenoid valve does not decompress or depressurizes and leads, it may be due to one of the following reasons:
1. Main valve or valve sealing surface with dirt;
2. The main valve or valve sealing surface damage;
3. The main or the china steam solenoid valve spring is tired or broken;
4. The feedback channel 3 hole is blocked;
5. Fatigue or damage to the diaphragm;
6. Piston cylinder wear or corrosion;
7. Piston ring groove and piston ring stuck;
8. Body cavity filled with condensate.

2017年9月18日星期一

Exhaust valve installation precautions

1, the installation, and the vertical line within 5 degrees of vertical installation.
2, before installation, please fully clean the pipe.
3, in order to maintain water in the maintenance can be installed on the entrance side of the pneumatic solenoid water valves or circular state of the single coil solenoid valve (not spherical).
4, in order to prevent water from the air exhaust port leakage, please in the air exhaust port together to the drains, put on copper, plastic casing and other materials. These brass, plastic casing and other materials to the end of the drain with the overflow line to stay more than 55mm space. In addition, when using a plastic sleeve, fasten it with a fastening tape.
5, where it is possible to freeze, please take insulation measures to prevent freezing damage.
6, if the water from the air outlet leaked, please loosen the nut, twist the knob, stop the leak, the inspection.

2017年9月12日星期二

Installation of solenoid valves

The type of 3 way 2 position valve is divided into many kinds, different types of solenoid valve, with the different places are also different. But the installation matters, although different, but roughly similar. Then the solenoid valve in the installation should pay attention to what matters?
Before and after the solenoid valve should be manually cut off the valve, while the bypass should be set to facilitate the maintenance of the solenoid valve in the event of failure. Solenoid valve is generally oriented, can not be installed, usually in the valve body with the direction of the flow of media, the installation should be installed in accordance with the direction of instructions. But in the vacuum pipe or special circumstances can be installed. Try not to let the solenoid valve for a long time in the power state, so easy to reduce the coil life or even burn the coil, that is, normally open, normally closed solenoid valve is not interchangeable.
Valve Solenoid Pilot in the installation of the time, first check whether the solenoid valve with the selection parameters consistent, if wrong, it will burn the coil. The supply voltage should meet the rated voltage range. General solenoid valve electromagnetic coil components should be vertical up, vertical installed in the horizontal pipe on the ground, if the space constraints or conditions must be installed side by side, the need to order when the selection. Otherwise it may cause the solenoid valve to not work properly. Take over the pipe before the rinse, the pipeline of metal powder and sealing material residues, rust and other clear. Should pay attention to the cleanliness of the media, if the media mixed with dirt, impurities and other obstacles to the normal operation of the solenoid valve, pipe should be installed filter or filter. If the media will be the phenomenon of water hammer, then you should use a waterproof function with a mercury hammer or take appropriate precautions.

2017年9月6日星期三

Analysis on Application of Solenoid Valve in Cold Storage

Medical Check Valves as a hot industry in industrial production, its products have been widely used in a variety of medical, production, life and other aspects of the device. Of course, the solenoid valve as a production of a good helper, but also by the majority of customers love. Cold storage operation and production, the solenoid valve played a big role. In the cold storage, we often use two forms of solenoid valve, respectively, is a single type of solenoid valve and three-dimensional solenoid valve. In the installation of these solenoid valve, we have to pay special attention to some matters, or will seriously affect the realization of the various functions of the cold storage.
We should pay attention to these aspects of the matter, the first: solenoid valve and the main valve connection, do not force too much, otherwise the middle of the five-hole aluminum sheet pressure, resulting in smaller or blocked through-hole can not turn on The Second: In order to prevent damage to the internal parts of the heat, remove the valve body, and then welding. After welding, the welding slag and the oxide are cleaned to prevent the channel from clogging.
Third: the magnetic isolation sleeve flange and the air cylinder accessories seat to rely on the gasket seal, tighten the screw, the angle should be tightened, if the force will cause uneven leakage. Fourth: both ends of the catheter alignment, vertical connection side of the parallel, with spot welding to ensure that the solenoid valve seal. Fifth: check and remove the electromagnetic valve and the main valve connection parts of the sealing line of the burr or dirt, so as not to scratch the soft aluminum sheet caused by lax.
It can be seen that the manual air control valve in many production and life will often have a great effect, so in the installation and use of the process, I have to pay special attention to the details of the above problems.