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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.
The manual valve is a valve operated by the handle and the hand wheel, and is a commonly used valve on the equipment pipeline.
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...
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
The sealing principle of the floating ball valve, because the ball of the floating ball valve is not restricted by any component, when the valve is in the closed state, the medium is pressed from one end (upstream) of the valve, the ball can generate a certain displacement and press at the outlet end of the valve ( On the sealing surface of the downstream), an outlet end seal is produced.
Advantages of the floating ball valve: the valve has small flow resistance, simple structure, good sealing performance, and high cost performance in a certain caliber and a certain pressure range.
Disadvantages of the floating ball valve: the load of the working medium of the ball will all act on the downstream sealing ring. At the same time, the gravity of the ball itself will be directly absorbed by the sealing ring. Therefore, if the valve pressure is too high, or the caliber is too large, it will Causes the following problems:
1. As shown in Figure 2, the load on the working medium of the sphere (F1) = ball valve runner area (S) * valve nominal pressure (PN / MPA)
It can be seen from the above formula that (1), when the valve diameter is constant, the larger the nominal pressure of the valve, the greater the load on the working medium of the sphere; when the nominal pressure of the valve is constant, the larger the valve diameter, the sphere The greater the load on the working medium.
Therefore, the valve of the same diameter, when the nominal pressure is large enough, it is not suitable for the floating ball valve structure; the valve of the same nominal pressure, when the diameter is large to a certain extent, is not suitable for the floating ball valve structure.
2. Because the gravity of the ball itself will be directly received by the seal ring, when the ball weight is too large, the different positions of the seal ring will be severely uneven, resulting in irregular deformation of the seal ring, affecting the valve life or valve seal. Therefore, when the caliber is large enough, no matter how low the pressure is, it is not suitable for the floating ball valve structure.
3. The torque of the ball valve is mainly from the friction between the ball and the seal.
There is a concept in the mechanical foundation: the friction between two objects (M) = positive pressure (F) * friction coefficient (f)
The coefficient of friction (f) is determined by the nature of the material itself, the material is selected, and the coefficient of friction is constant.
The positive pressure (F) is proportional to the load (F1) of the working medium that the ball is subjected to.
Therefore, when the load (F1) of the working medium of the ball is large, the friction between the ball and the sealing ring will be large, and the torque of the floating ball valve will also increase. Therefore, when the valve diameter is constant, the larger the nominal pressure of the valve, or the larger the valve nominal pressure, the larger the valve diameter will greatly increase the torque of the ball valve.
In general, the selection specifications of the floating ball valve can be referred to as follows:
PN ≤ 2.5MPA (or 150lb), DN ≤ 200mm (or 8")
(DN≤200mm (or 8") is a defective product, preferably a fixed ball valve)
PN=4.0MPA (or 300lb), DN≤150mm (or 6”)
DN ≤ 150mm (or 6") is a defective product, preferably a fixed ball valve)
PN=10.0MPA (or 600lb), DN≤100mm (or 4”)
PN=16.0MPA (or 900lb), DN≤50mm (or 2”)
PN=25.0MPA (or 1500lb), DN≤40mm (or 1.5”)
PN=42.0MPA (or 2500lb), DN≤25mm (or 1”)
If the actual manufacturer exceeds the above specification range and adopts the floating ball valve structure, due to the structural characteristics of the floating ball valve, the valve will also have a high fixed torque ball valve with the same torque. At the same time, the service life will be shortened. Please be cautious use.