BRATTLEBORO — A leak in a valve in a steam line at Vermont Yankee nuclear power plant was finally sealed Wednesday afternoon.

The fix, which involved injecting a sealant inside a clamp around the valve, is only temporary. The valve will be fixed when the plant undergoes its next refueling outage in 2010.

“You may recall that Entergy three times before clamped the valve and injected leak repair material, but it did not work,” said Neil Sheehan, spokesman for the Nuclear Regulatory Commission. The valve is located in the reactor water cleanup system, which was out of service temporarily while the repair work was conducted, he said.

“The company is continuing to monitor the valve to ensure that the repair is working.”

The NRC’s resident inspectors observed the entire repair process, said Sheehan. “They continue to periodically check to see whether the fix is holding. As recently as this morning, they were taking a look at the valve via the TV monitor providing live video of the room.”

The valve had been leaking about 3,600 gallons of water a day since the leak was discovered in early January.

“A closed circuit camera is now installed at the valve to enable technicians to ensure valve remains sealed,” said Rob Williams, spokesman for Vermont Yankee. “At our next refueling outage, we will repair or replace the valve so that the sealant will not be needed.”

pressure reducing valve Flow control valve Pump Control Valve Balance Valve

By Michelle Fay Cortez and Shannon Pettypiece

March 10 (Bloomberg) — A dozen Schering-Plough Corp. experimental drugs that are nearing marketing approval in the U.S. may pay off for Merck & Co. before that company loses patents on medicines with $8 billion in annual sales.

The purchase of Schering-Plough, of Kenilworth, New Jersey, for $41.1 billion in cash and stock gives Merck new products for cancer, immune diseases and psychiatric disorders. It also awards Merck, of Whitehouse Station, New Jersey, full control of revenue from the cholesterol pills Zetia and Vytorin, which it now shares with Schering-Plough.

Merck’s $4 billion-a-year asthma drug Singulair will face generic competition by 2012. By then, Schering-Plough has said it plans to file for approval of seven drugs, each with more than $1 billion in peak annual sales. One of the experimental medicines is a blood thinner that may help 20 million Americans.

“What makes Schering so attractive is the number of drugs in their pipeline and the lack of generic competition,” said David Moskowitz, an analyst with Caris & Co., in a telephone interview. “It’s a tremendous deal for Merck.”

Schering-Plough’s biggest sellers aren’t nearing patent expiration. The company is developing the blood thinner for heart patients, a schizophrenia drug, the once-a-month injected arthritis medicine golimumab, a treatment that reverses anesthesia’s side effects, and anti-viral remedies for hepatitis C and other infectious diseases.

The deal between the two New Jersey-based drugmakers “is about the science,” said Merck Chief Executive Officer Richard Clark in a conference call with investors.

Blood-Thinner Study

Schering-Plough is nearly finished with a study for its blood thinner, dubbed TRA, and plans to seek regulatory approval in 2010 or 2011. The medicine is designed to prevent clots without boosting the risk of bleeding, a major drawback of existing drugs for heart patients.

The medication could compete against Plavix from New York- based Bristol-Myers Squibb Co. and Paris-based Sanofi-Aventis SA. Plavix is the world’s second-biggest drug with more than $8 billion in annual sales.

Prasugrel, made by Eli Lilly & Co., of Indianapolis, Indiana, and Tokyo-based Daiichi Sankyo Co., won the backing of a Food and Drug Administration advisory panel last month for patients getting artery-clearing procedures, and other companies are experimenting with treatments to prevent clots with less bleeding than Plavix or prasugrel.

Merck also would gain Schering-Plough’s best-selling drug, the anti-inflammatory medicine Remicade, which it markets outside the U.S., and a successor known as golimumab. Schering- Plough collaborates on both drugs with Johnson & Johnson, of New Brunswick, New Jersey.

J&J Factor

J&J may bid for Schering-Plough or fight for rights to Remicade and golimumab, said Tim Anderson, an analyst with Sanford C. Bernstein & Co. in New York, in a note to clients.

Schering-Plough filed for European approval of golimumab a year ago and has predicted peak sales of more than $1 billion.

Buying Schering-Plough also gives Merck full control of the cholesterol pills Zetia and Vytorin, whose sales plummeted in 2008 after a study questioned whether they were better than an older generic drug at unclogging heart arteries. The companies plan a combination of Zetia, which lowers the body’s absorption of cholesterol, with Pfizer Inc.’s Lipitor after that medicine loses patent protection in 2011.

Schering-Plough’s biggest selling drugs have patent protection until the middle of the next decade, said Thomas Koestler, president of the company’s research institute, in a briefing last year. That means its experimental products will generate extra revenue, rather than replacing sales lost to competitors, he said.

No Guarantee

The experimental drugs aren’t guaranteed successes.

The FDA rejected Schering-Plough’s sugammadex, also known as Bridion, in August because of allergic reactions and other side effects. The injected medicine to reverse anesthesia is approved in Europe. Schering-Plough got the drug as part of its $16.1 billion purchase of Akzo Nobel NV’s Organon BioSciences unit in 2007.

The FDA also asked for more information about a schizophrenia drug Schering-Plough is developing called Saphris. Schering-Plough answered the agency last month. The drug, which the company said is another potential $1 billion seller, would compete with Johnson & Johnson’s Risperdal, Eli Lilly & Co.’s Zyprexa, AstraZeneca Plc’s Seroquel and Bristol-Myers Squibb Co.’s Abilify in the $16.2 billion a year market for schizophrenia treatments.

Saphris worked no better than a placebo in half its schizophrenia studies and caused side effects in patients with bipolar disorder, researchers said.

Animal Drugs

Schering-Plough also is the biggest animal health company, with sales of about $3 billion a year treating pets and working animals. Its over-the-counter and consumer health products, including the allergy pill Clariton, also generate about $1 billion in annual sales.

Merck plans to sell Schering-Plough’s 50 percent stake in an animal-health joint venture with Sanofi-Aventis SA as part of the deal, according to people familiar with the transaction.

“Assuming Merck keeps these, it would help the company achieve a greater level of revenue diversification,” said Anderson of Sanford C. Bernstein, in a note to clients. “Merck is buying a good collection of assets overall.”

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there in no such problems as clenching or disjointing.

2. It features the function of slipping between the ball with cutting edge and metal seat, which is particularly suitable for the medium containing fibre, solid particles,

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The Top Entry Trunnion Ball Valve supported design and unique seat retraction technique gives the convenience of in-line repair or replace valve internal components without dismantling it from pipe line.

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The Pump Control Valve eliminates damaging water surges (hammer) caused when pump starts up and shuts off. The electrically activated valve gradually opens when pump starts up, and slowly closes before the pump is switched off. The valve also operates as a slow control check valve, preventing reverse flow and water hammer when power failure.

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A valve is a device which can be used to control the flow of liquids, gases, and slurries. Also known as regulators, valves can be found in almost any situation: chances are that you are sitting within a few feet of a mechanical valve right now. There are a number of different designs for valves, depending on how they are being used, and they can be found in a range of sizes from smaller than a pinky to gigantic. Valves also vary from the extremely basic to the extraordinarily complex, and they are one of the oldest mechanical designs; basic valves have been in use for thousands of years.

The term “valve” can be used to refer to human anatomy as well as a mechanical device. Valves throughout the body regulate the flow of blood, oxygen, and body fluids. Valves in the body include the extremely important heart valve, which works with the heart to pump blood through the body. Individuals with heart disease may have their heart valves replaced with artificial ones to perform this vital body function. The numerous valves in the human body work together to keep things running smoothly in your daily life.

Numerous permutations of the mechanical valve exist, but the following are common valves you probably see and use on a daily basis. The most basic mechanical valve is a gate valve, which has two positions: open, and closed. A globe valve is slightly more complex, controlling not only the flow of liquid, but also the amount, and is also called a throttle. For example, most taps are forms of a globe valve, allowing users to turn the water on and determine how much water is going to flow out. Manufacturers also make check valves, designed to restrict the flow of a substance to one direction only, and safety valves, which can release dangerous levels of pressure.

A valve can be manually controlled, like a tap, or controlled by a large system, as is the case in a car, where valves open and close to permit combustible fuel to enter the cylinder. In the case of a safety valve, the valve may be set to trigger when a certain pressure level is reached, or when an emergency signal is sent out. Usually, a safety valve is equipped with a small spring that will hold it shut until it needs to be opened. In other instances, valves may be controlled by users through a computer system, as is the case with oil, gas, and water pipelines that sprawl for miles: technicians in a central control center can open and close valves remotely, as needed.

Water Control Valve water-level valve remote control float valve pressure reducing valve Pressure Difference Balance Valve Emergency Shut-off Valve Flow control valve pressure relief or sustaining valve electrical control valve Pump Control Valve

Sometimes referred to as a compressor relief valve, the compressor bypass valve is a mechanical device that makes use of vacuum action to release pressure from the intake system on various types of motors. Found in the design for many turbocharged and supercharged automobile engines, compressor bypass valves are also found in the engines of various types of planes and in some train engine designs as well. Developed in the early 20th century, the efficiency and use of the compressor bypass valve has continued to be refined over the years.

Designed to function as a vacuum actuated valve, the compressor by pass valve helps to route the pressure generated within a turbo or supercharged engine back into the non-pressurized end of the intake system. At the same time, the pressure is not reintroduced into the mass airflow sensor, so the action of the valve does not inhibit overall efficiency of the use of air in the creation of power and motion. However, the compressor bypass valve does make it possible for the intake system to avoid the generation of compressor surges that could result in spikes of pressure that would weaken the overall intake process.

The main function of the compressor bypass valve is to allow the escape of pressure during the segment of operation when the throttle plate is closed. Without the presence of the valve to allow the pressure to be rerouted, the pressurized air would simply crash into the plate, build up, and eventually be repelled back into the turbo. This strong wave of pressurized air would not only create additional wear on the turbo proper, but also slow and possible stop the action of the turbo altogether.

One of the first designs for the compressor bypass valve was included in the AEM, a design for an electric vehicle developed in France and released in 1924. Since that time, the compressor bypass valve has continued to be enhanced, allowing the basic function of the valve to easily adapt to larger and more powerful engines.

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A ball valve, one type of quarter turn valve, is quite literally a ball placed in a passageway through which fluid flows. The ball has a hole through it, by which the valve opens and closes. When the ball is positioned so that the hole runs the same direction as the passageway, the fluid simply flows through the hole, and the valve is open. However, when the ball is positioned so that the hole is perpendicular to the passageway, the fluid cannot pass through, and the valve is closed. The ball is controlled from outside the valve, often with a handle that is turned 90 degrees, or a quarter turn, back and forth to open and close the valve.

The basic ball valve, described above, is a two-way valve. This ball valve has a single, straight passageway bored through the ball, making two openings: one on each side, an inlet and an outlet. A ball valve can also be a three-way valve if a third hole is bored partially through the ball, until it meets the main hole, forming a T. A three-way ball valve can shut off one or all of the three passageways it connects.

Because of the nature of the ball valve, it does not work well in situations in which fine control of the valve is needed, such as the valve that controls the throttle in a car. However, a ball valve works very well for situations in which a flow needs to be completely shut off, such as the shut-off valve on the main water line in your house. Ball valves also do not tend to develop problems if they are not used for long periods of time; they will still work perfectly when needed again.

There are three different types of ball valve. A full port ball valve offers no flow restriction, which means that when the ball valve is open, the liquid can flow freely through it. This is achieved by making the ball larger than the passage size, so that the hole bored through it can be the same size as the passage. A standard port ball valve does not have an oversized ball, and as a result the hole is one size smaller than the passageway. This presents a small amount of flow restriction as the fluid passes through the ball valve. A reduced port ball valve, on the other hand, has an even smaller ball and an even smaller hole, which creates significant flow restriction as the fluid passes through the valve. Floating Ball Valve Two-piece Mounted Trunnion Ball Valve V Type Ball Valve Three Way Ball Valve Floating Ball Valve With Reduced Bore Forged Steel Floating Ball Valve Trunnion Ball Valve With Reduced Bore Three-piece Forged Steel Trunnion Ball Valve Metal To Metal Sealed Ball Valve

DRVZ silence check valve consists of valve body,seat,diversion shuttle,disc,bearing and spring etc..The bore is flow-line designed so pressure loss is very little.The disc’s stroke is very short and when stop the pump the valve can close quickly and prevent the great noise from water-hammering so the valve can close quietly without any noise .It is widely used in feeding/draining system,fire protection and heat supplying system,and it is installed at the outlet of the pump to prevent backward fluid’s and water-hammering’s damage to the pump.

Related Products of DRVZ silence check valve:

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diaphragm type adjustable pressure reducing\sustaining valve

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1, Technology

　　Butterfly Valve by Butterfly valve body, the hydraulic bypass valve joint, a heavy hammer, the release of devices, manual pumps (or electric pumps), rack of electronic transmission and control of the fuel tank, and other parts. Oil from the pressure of imported oil tank rack drive, the piston rack on promoting butterflies My training gear axis of rotation to open the butterfly plate, and coaxial on the move Zhigao Dian weight. Weight on the pallet through the device to release the lock on the spindle axis spindle lock; lock spindle axis fixed by the electromagnet and support up to control the device. When the time of the accident, as part of the electronic control of the movement, electricity electromagnet, the spindle axis lock out of control, a heavy hammer in the role of the self-release under the rotation axis around so that the butterfly valve to close automatically.

　　The butterfly valve of the hydraulic system, the use of cutting 2 to close the butterfly valve to control the speed at the beginning of the closure of speed in order to reduce the time for Speed and the continued rise in rates; stage after the closure of the slow rate of up to control water pressure.

　　2, and the technical characteristics of the main technical parameters

　　2.1 technical features

　　The whole assembly with a flashlight dual-use hydraulic system so that the whole structure of the compact, easy to use.

　　In the absence of external power supply, the use of gravity to shut down its own storage. When the unit has been growing too fast, overheated bearings and loss of field when the generator can automatically shut down, which had a crew of the automatic protection.

　　With a speed of the closure of two properties.

　　Electromagnet used to control the spindle lock body of a safe, reliable operation and small power.

　　2.2 The main technical parameters, indicators

　　D741-10 with a heavy hammer-type butterfly valve, for example, the main technical data: pressure, 1MPa; diameter, φ400, φ500, φ600, φ800, φ1000, φ1200; the use of the highest-head, 100m; the highest step-up head, 145m; open , 5min manual about 1min or so electric; closing time, fast paragraph 5 ~ 10s; slow clearance above 10 ~ 50s; the scope of protection has been growing too fast, 1.8 times the rated speed (adjustable).

　　3, application specific locations and results

　　Linhai City, Zhejiang Province, Tan Chai Station Pingyang County, Zhejiang use of hydropower plant equipment, automatic production of two weight-D741X-10 butterfly. Power for the type of hybrid, there is pressure tunnel 1100m, diameter 2.6m, pressure pipe length 50m, diameter 1.2m, design head 45.5m, the highest-head 47m, the design flow 1.8m3 / s, turbine HL220-WJ-50A, power generation Machine SFW-630-6/990 (reactance shunt excitation), rated voltage 400V, rated capacity of 630kW, the rated speed of 1000r/min. Jan 2, 1991 into the big power grid to March 1993, the two machines running together, 7780h. Valve weights running well, the evaluation are as follows: (1) moves in the right equipment to achieve safe production, two open 203 butterfly, to close at 203, 100% accuracy rate movements; (2) the average time to open the electric 55s, Load rejection of fast time set to 5s, to quickly reduce the rate of increase in speed, the rate of increase of 40%, slower clearance time is set to 20s, after the slow rise in water pressure to reduce the rate of increase in the rate at 21 %; (3) stands in the accident in the process of generating units has been growing too fast when more than 1.4 times the rated speed, the device made by the gun so that a heavy hammer into the automatic closure of the release valve to prevent the expansion of the accident, an increase of running a sense of security.

Tripe Eccentric Butterfly Valve wafer soft seat butterfly valve single eccentric manual wafer soft seat butterfly valve

　　4 Conclusion

　　First of all, to improve the reliability of the equipment to ensure the safety of the stands. Second, to reduce the labor intensity of workers to run, to reduce the maintenance workload. Two units to reduce the staff on duty 4, the annual savings of about 80,000 yuan.

　　In addition, the valve in one (less) were on duty and power networks in isolation or in power when the electricity lost when the plant automatically shut down a heavy hammer release, without back-up DC power to operate.

　　In some of the power plant design, if the unit is scheduled to GD2 hydraulic structures and layout of the conditions, can not find a suitable guide vane closing time to ensure that the unit rate on the rise and water pressure on the appreciation is less than the standard required to allow the value of At this time can be taken to speed weight-2 butterfly valve closed fast to the benefit of reducing the speed increase, after the slow reduction in water pressure can rise. This law set up than the artificial resistance reliable than the surge tank to set the economy.