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PLUG VALVE VS. BALL VALVE
PLUG VALVE VS. BALL VALVE
2020-10-16

Generally speaking, a plug valve and a ball valve may absolve the same function (fluid shut-off). The main differences are:   Plug valves are more economical than ball valves, generally, due to their simpler design   Plug valves are less prone to contamination by debris, and accumulation of dirt in the interstitial spaces, compared to ball valves (an issue that is frequently faced by ball valves, due to the spaces existing between the sphere and the body of the valve)   Ball valves require more maintenance than plug valves, especially after planned or unplanned plant shut-downs   Plug valves have a full port design, without pressure drops, ball valves may be reduced or full port (a full port ball valve would be heavier and bulkier than a plug valve of the same size)   In general, plug valves are good alternatives to ball valves, even if ball valves are still considered industry standard for shut-off operations at least in the oil & gas industry.

Two Festivals Meet, Double Joy We Have In Dervos
Two Festivals Meet, Double Joy We Have In Dervos
2020-10-01

This year the holiday for family reunions, Mid-Autumn Festival, and for the country's founding, National Day, coincide.   As the two special festivals both fall on October 1 this year, Chinese cities, certainly including Xiamen where Dervos lays its root in, are festooned with flowers and lanterns and holding colorful activities to celebrate the joyful occasion.     And here in Xiamen, we have a traditional activity called Bo Bing, or "gambling for cakes", to celebrate the Mid-Autumn Festival. The game requires six dice and a wide mouthed bowl. Players throw the dice in turn and wins a specific prize depending on the dice combination. We divided into three groups. Screams and cheers rose up and fell down as every time dice being tossed. Because the quantity of gifts is limited, whoever tosses the specific number earlier, gets more presents till all are given out.   After the exciting game, we headed towards a beautiful and cozy coastal hotel for the rest of this happy time. In there, the games, the songs and the palatable food all added together to make a memorable occasion.  At the stretching beach and on the pleasant moment, we flew balloons that carry our best wishes and sang our company song --“we are a loving family”. Happiness and group cohesion drew a perfect period of this wonderful night.

Advantages of V-port Valves
Advantages of V-port Valves
2020-09-18

The V-ball valves or V-port ball valves are similar to traditional ball in which there is a V-notch on a ball-shaped disc to control flow by a rotating quarter-turn motion. The “V-port" is a particular design that bring about precise flow and the ability to regulate and control flow by V balls of  different degrees. These special valves are used in a wide range of chemical applications, including the most challenging services with many advantages.   Flow Modulating The accuracy of V-ball valves provides equal percentage flow characteristics. As the ball rotates, desired flow rates can be achieved by positioning the ball anywhere between 0° and 90°.   Bubble tight shutoff V-ball valves have the ability to close tightly. Therefore, no other shutoff valves is required when using a V-ball valve on a globe valve.   Lower pressure drop V-ball valves also have a higher coefficient of flow (Cv) than the same size globe valve, which directs the flow and uses a plug to control the flow through the valve. This means that the flow rate achieved by one shut-off valve can be achieved with a smaller V-ball size.   Higher shutoff pressure. A 90°rotation of the ball allows the V-ball to close at a higher operating pressure. This therefore allows the use of lower torque actuators, resulting in cost savings and increased efficiency for the end user.

완전 용접 된 볼 밸브는 밸브 본체의 나사산 연결부가 용접 부품으로 대체 된 밸브입니다. 나사산이 제거되어 밸브가 가벼워 지지만 누설이 거의 없습니다. 지상 또는 지하 설치에서 유지 보수가 필요하지 않은 경우 완전히 용접 된 볼 밸브가 바람직합니다.

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