- Principle of action of high pressure check valve
- When the medium flow in accordance with the prescribed direction, the disc by the role of the medium force, is opened; when the medium countercurrent, because the disc weight and disc by the role of the dielectric anti-force, so that the disc and the sealing surface of the seat is closed to close, to prevent the media countercurrent.
- Advantages of high temperature and high pressure cutoff valves
1, simple structure, manufacturing and maintenance is more convenient.
2, small work itinerary, short opening and closing time.
3, good sealing, sealing surface between the grinding force is small, life is longer.
- Working principle of high pressure ball valve
High pressure ball valve it has the action of rotating 90 degrees, the plug body is a sphere, there is a circular through hole or passage through its axis. Ball valve in the pipeline is mainly used to cut, distribute and change the flow direction of the medium, it only needs to rotate 90 degrees of operation and a very small rotation torque can be closed tight.
Ball valve is most suitable for switching, cutting valve use, but recent developments have designed the ball valve to have throttling and control flow, such as V-shaped ball valve. The main characteristics of high-pressure ball valve is its own compact structure, reliable sealing, simple structure, easy maintenance, sealing surface and surface is often closed state, not easy to be eroded by the media, easy to operate and maintain, suitable for water, solvents, acids and natural gas and other general working media, but also suitable for harsh working conditions of the media, such as oxygen Methane and ethylene, etc., are widely used in various industries. The ball valve body can be whole or combined.
- Inspection after installation of ball valve
1. Operation Drive sta rt, closed ball valve several times, should be flexible without stale, to confirm that its work is normal.
2. According to the piping design requirements for the pipeline and Shanghai good ball valve between the flange bonding surface for sealing performance inspection.
- How to install ball valves
⑴ The loaded the valve into the pipeline. Any end of the valve can be mounted on the upstream end. Valves driven with handles can be mounted anywhere on the pipe.
However, a ball valve with a gearbox or pneumatic driver should be mounted upright, that is, mounted on a horizontal pipe, and the drive is above the pipe.
⑵ The valve flange and the pipeline flange are fitted with gaskets according to the piping design requirements.
⑶ The bolts on the flange need to be symmetrical, successive and evenly tightened.
⑷ Connect pneumatic pipelines (when pneumatic drives are used).
- Preparation of ball valves before installation
⑴ The front and rear lines of the ball valve are ready. The front and rear piping shall be coaxial and the sealing surface of the two flanges shall be parallel. The pipe should be able to withstand the weight of the ball valve, otherwise the pipe must be equipped with appropriate support.
⑵ the valve front and rear pipeline sweep clean, remove the pipe in the oil, solder slag and all other impurities.
⑶ Check the logo of the ball valve to find the ball valve intact. The valve is fully closed several times to confirm that it is working properly.
⑷ remove the protective parts on the flange at both ends of the ball valve.
⑸ Check the valve hole to remove possible dirt and then clean the valve hole. A foreign body between the seat and the ball, even if only tiny particles, may damage the seat seal surface.
- Valve Maintenance Tips
1, the sealing performance of the valve should be tested to ensure its performance.
2, should check whether the valve sealing surface wear, and according to the situation for repair or replacement.
3, Valve storage environment needs attention, should be stored in a dry and ventilated room, and clogging the two ends of the path.
4, installed and in use of the valve, it should be regularly overhauled to ensure that it is working properly.
5, the operation of the valve should be intact, flange and bracket on the complete bolts, thread non-destructive, no loosening phenomenon.
6, check the stem and stem nut trapezoidal thread wear, whether the filler is outdated failure, and so on, and carry out the necessary replacement.
7, if the valve use environment is relatively bad, vulnerable to rain and snow, dust, wind and sand and other dirt contamination, you should install a protective cover for the stem.
- What is a vertical check valve
Vertical check valves are widely used in systems that need to prevent dielectric backflow, such as pump exits, hot water recharge ends, and water suction ends of centrifugal pumps. Its role is to prevent the media backflow may have a variety of consequences, such as the pump outlet does not install vertical check valve, in the sudden shutdown of the pump when the high-speed reflux water will cause a huge impact on the pump impeller, centrifugal pump suction end does not install vertical check valve (bottom valve), each boot needs to pump.
- Precautions for installation of check valves
1, in the pipeline do not make the check valve bear weight, large check valve should be independently supported, so that it is not affected by the pressure generated by the pipe system.
2, the installation of attention to the direction of media flow should be consistent with the valve body ticket arrow direction.
3, lifting type vertical valve check valve should be installed on the vertical pipe.
4, lifting type horizontal valve check valve should be installed on the horizontal pipe.
- How the valve industry develops in the future
In SINGAPORE's current valve market, in addition to low-pressure valves to reach the international market acceptable level, high-pressure valves still need to rely on imports. In the context of sustained macroeconomic optimism, most of the valve industry's production and sales indicators have maintained a relatively rapid growth, but affected by the price war, the industry sales revenue and profits fell sharply from the same period last year.
With the recovery of the world economy, SINGAPORE's valve products import and export has also increased, but because of high-end technology and foreign manufacturers still exist a large gap, in the future period, product technology will become a bottleneck restricting the development of valve products in SINGAPORE. From the product situation, SINGAPORE's valve industry has now been able to produce more than 10 categories of products, such as gate valve, globe valve, check valve, ball valve, safety valve, pressure relief valve, needle valve, regulator valve, diaphragm valve, butterfly valve, solenoid valve, trap, plunger valve, plug valve, forging steel valve, needle valve, instrument valve, level meter, flowmeter, exhaust valve, flame retardant , knife type gate valve, slurry valve, copper valve, balance valve, stainless steel valve, lining fluorine liner valve, pipe clamp valve, American standard valve, power station valve, breathing valve, hydraulic control valve, vacuum valve, discharge valve, pneumatic angle seat valve, insulation valve, filter, bottom valve, balance valve, sewage valve, etc., the maximum use temperature reached 570 ℃, the lowest is 196 ℃ With a maximum pressure of 600MPa and a maximum diameter of 5350 mm. In addition, according to the relevant department statistics, SINGAPORE's annual valve market turnover of about 50 billion yuan, of which more than 10 billion yuan of the market by foreign valve enterprises occupied.
- How to distinguish whether the ball valve is cast or calcined
One: Casting ball valve, insiders at a glance to see out is casting, casting Simple said is to put iron into the furnace for melting, in the casting molding after the ball valve, this is casting, of course, in the casting process also has a lot of tedious processing technology.
Second: Forging ball valve, is also often said to forge steel ball valve, forging process: Forging is the use of forging machinery to pressure metal blanks, so that it produces plastic deformation, in order to obtain a certain mechanical properties, a certain shape and size of the forgings processing method. Forging and stamping belong to plastic processing properties, collectively known as forging.
