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RKS fluid was founded in 1997. We are a production workshop for both foundry and machining, research & development center, and quality inspection cent...
Swing check valve is mounted with a disc that swings on a hinge or shaft. The disc swings off the seat to allow forward flow and when the flow is stop...
Features： Fully bore globe pattern design, lowest head loss while fully open Keep stable working condition even the flow rate close to zero High sens...
Ⅰ Business area: fluid control products, technology and environmental protection products. Ⅱ Advanced CNC machining centers, professional process ce...
RKS fluid was founded in 1997. We are a production workshop for both foundry and machining, research & development center, and quality inspection cent...
Series: SASQUATCH series soft seal gate valve Port size: DN50 - DN900 (NPS2-NPS36) Pressure rating: PN10, PN16 Temperature: 0℃~80℃ Connection: Flange Certificate: CE ,WRAS,API,OHSAS18001:2007,ISO9001:2015
Series: HYDRA Series Resilient Seat Butterfly Valve Temperature: -29℃ ~ +120℃ Pressure: PN6, PN10, PN16(Class 150) Port Size: DN32-DN2400(NPS1 1/4-NPS96) Power: Manual, Electric, Pneumatic, Hydraulic
Butterfly valves have been around for a long time, and are used for a variety of applications. They made their first appearance during the 1930s, and have been utilized by several industries ever since. Often made out of cast iron, butterfly valve's name is based from the functionality of its disc.
The wafer butterfly valve is one of the most common types of valves in industrial pipelines. The structure of wafer butterfly valve itself is relatively small. It is only necessary to put the butterfly valve in the middle of the flange at both ends of the pipe, and use the stud bolt to pass through the pipe flange and the pair.
Valves are the most common equipment in chemical companies. It seems easy to install valves, but if they are not implemented in accordance with the re...
The manual valve is a valve operated by the handle and the hand wheel, and is a commonly used valve on the equipment pipeline.
DIN standard now uses EN standard structure length
EN 558-1 PN flange connection valve construction length (instead of DIN 3202), EN 558-2 CLASS flange connection valve construction length (instead of BS2080), EN 12982 butt weld end valve construction length (instead of DIN 3202), DIN standard The length of the structure including the length of the API valve is basically the same as the length of the GB...
Resilient-seated gate valve with bolted cover connection; made of ductile iron materials and with epoxy coating, designed as both clockwise and anti-c...
The butterfly valve disc is a key component of the butterfly valve, which acts on closing and opening and closing. Butterfly valve seat and butterfly ...
What is Kieselguhr Filter? What's the working principle of Kieselguhr Filter? The kieselguhr filter (Candle filter / Cake Filter) which we for customized for fluorine chemical plant six more lithium fluoride phosphate phosphorus process have been installed and working for two years
MINOTAUR series replaceable seat high performance butterfly valve
"Water hammer effect"
It means that when the open valve is suddenly closed, due to the inertia of the pressure water flow, the water flow shock wave is generated and the damage is caused. This is the "water hammer effect" in the hydraulics, that is, the positive water hammer.
On the contrary, after the closed valve is suddenly opened, it will also produce a water hammer, called a negative water hammer, which also has a certain destructive power, but it is not as large as the former.
Usually, the closing element suddenly sucks into the valve seat when the valve is close to closing, which is called the cylinder blocking effect.
The tank lock-up effect is caused by a low-thrust actuator that does not have sufficient thrust to maintain a position close to the valve seat, resulting in a sudden closing of the pump or a sudden closing of the valve, resulting in a water hammer effect. For control valves, in some cases, valves with a quick-open flow characteristic can also cause a water hammer effect.
Although the water hammer produces a lot of noise, the real damage is caused by mechanical failure. Because the kinetic energy changes drastically into a static line pressure, the water hammer can break the line or damage the pipe support and damage the pipe joint. For valves, water hammer can cause severe vibration through the spool, which can cause failure of the spool, gasket or packing.
For valves, the way to prevent water hammer is to prevent any sudden pressure changes in the system.
This includes slowing down the closing speed of the valve itself or providing a greater degree of tension and rigidity when the closing element approaches the valve seat. To prevent pressure fluctuations, the valve should be closed at a uniformly varying speed. In some cases, when using the fast-open feature, it may be required to change to an equal percentage characteristic. For control valves that must be throttled when approaching the seat, an actuator with a sufficiently large output thrust, such as a piston-type pneumatic actuator or a hydraulic actuator, or a special notch on the stroke sleeve of a manually rotating operator, should be used. Will reduce or prevent the cylinder blockage effect. Setting a type of anti-fluctuation on the pipeline system also reduces water hammer. This can be done using a pressure relief valve or a buffer tank. In addition, gas can be injected into the system, and gas injection can reduce the density of the fluid and provide some compressibility to handle any sudden fluctuations.