The flat gate valve is a sliding valve whose closing part is a parallel gate. The closing part can be a single gate disc or a double gate disc with a supporting mechanism between them. The pressing force of the wedge to the valve seat is controlled by the medium pressure acting on the floating wedge or floating valve seat. If it is a double wedge flat gate valve, the support mechanism between the two wedges can supplement this pressing force. Features of flat gate valve: 1. The valve seat adopts O-ring seal and floating valve seat structure with preload, so that the inlet and outlet of flat gate valve are sealed in both directions. The opening and closing torque is only 1/2 of ordinary valves; 2. When fully open, the channel is smooth and straight, the flow resistance coefficient is very small, there is no pressure loss, simple cleaning; 3. The packing structure with self sealing ability is adopted, the sealing performance is more reliable than ordinary graphite packing. In addition, grease is injected into the sealing surface of the packing, the sealing surface meets the zero leakage standard; 4. When the flat gate valve is closed, it can automatically remove the high pressure in the inner cavity to ensure the safety of use; 5. Fully enclosed structure, good protection performance. Flat gate valve is divided into single gate plate and double gate plate. According to the connection mode, it can be divided into butt welded flat gate valve and flange flat gate valve. Features of butt welded flat gate valve: 1. Small fluid resistance and small scouring and erosion of sealing surface by medium; 2. Opening and closing is labor-saving; 3. The flow direction of the medium is unrestricted, no turbulence and no pressure reduction. 4. Simple shape, short structure length, good manufacturing technology and wide application range. Flange flat gate valve is stable and reliable when used in pipeline, Therefore, DERVOS recommends that flange flat gate valve could be used in high pressure pipeline. Features of flange type flat gate valve: 1. The sealing structure of flange flat gate valve is elastic with preload, and the upstream and downstream sealing seats are sealed at the same time. There is always face-to-face seal between the valve seat and the seal; 2. The valve seat has self-cleaning function and is not directly scoured by the air flow during the opening or closing of the valve. The valve seat is made of lubricated and non abrasive materials; 3. The problem of the valve actuator will not affect other parts of the valve, and the maintenance and replacement can be carried out without removing the valve; 4. When the flange flat gate valve is fully opened, the channel is smooth and straight, the flow resistance coefficient is very small, there is no pressure loss, and the pipeline can be cleaned by wool ball.

In Short, the role of the check valve in pipe system is to prevent backflow of media. Check valve alsocan be divided into hard seal check valve and soft seal check valve--soft seal check valve sealing performance isoutstanding and it can reach zero leakage, butcanonlybe putin the normal temperature and low pressure pipeline, while hard seal check valve can. And due to the manufacturing process,hard seal check valvealwayshas a certain amount of leakage. But the advantage of hard seal is that it can adapt to high temperature and high pressure environment. Therefore, you can nothave a frivolous judge that the hard seal check valve is good or soft seal check valveis. Both have their advantages as long as they are correctly installed in the appropriate working conditions on the pipeline. So how to make a choice between them two? 1. Soft seal The spin or seat of soft seal check valve is made of non-metallic materials (mainly PTFE, and rubber, etc.). It enjoys remarkable sealing performance, but sustains reproof that it may leave more or less residues (such as welding slag, iron filings, etc.) in the pipeline system as they flow through the regulating valve, which is prone to hurt the valve seat or spool. Therefore, choosing soft seal check valve means extra notices on the purity of  medium and cleanness of the pipeline before commissioning. 2. Hard seal Hard seal check valve would adopts welded wear-resistant alloy on its sealing surface which balances sealing performance and the service life and reliability. Although it dwarfs as a competitor with soft seal check valve when it comes to sealing performance, it is enough to meet the needs of most working conditions, and it enjoys durable and longer service life. Xiamen Dervos is an API-Certified ball valve manufacturing and trading company who specializes in the production of various kinds of valve. In addition to all kinds of common valves such as gate valves, globe valves, plug valves and butterfly valve , we also produce other unconventional valves as long as our customers file their requirements. We stand ready whenever you have any requests. Contact us today for the best valve purchasing experiences.

Q: What is the Q41F ball valve and what do the letters on the Q41F-16C ball valve model number mean? Dervos: According to the "valve type composing method", we can disassemble and analyze the Q41F-16C ball valve letter by letter.   --Valve type: Q stands for ball valve.   --Drive mode: handle operation can be omitted.   --Connection mode: 4 stands for flange connection.   --Structure: 1 stands for floating ball straight channel   --Seal surface and lining material : F stands for fluoroplastic.   --Nominal pressure: 16 represents pressure of 16 kg, namely 1.6 mpa, or PN16   --Valve body material: C for cast steel Based on information above, we now get Q41F-16C ball valve is 16PN handle-operated PTFE-lined flanged ball valve. If you want have a quota of Q41F-16 ball valve or other types of valves, welcome to leave a message. Xiamen Dervos is an API-Certified valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to all kinds of common valves such as gate valves, ball valves, globe valves, plug valves and butterfly valve, we also offer you the best actuators as long as our customers file their requirements. To learn more about our industry-leading products, contact us today.

With the rapid development of the coal industry, China's coal seam mining technology has reached an advanced level. Pneumatic hard seal ball valves are one of the essential components of the hydraulic system in coal mine. Dervos lists following common failures when the pneumatic hard seal ball valve does not work. Troubleshooting should be done from the following aspects. 1. Coil Burnout The wiring of the pneumatic hard seal ball valve can be removed and measured by a multimeter. If there is an open-circuit, the coil could burn out. 2. The slide valve sleeve is stuck The distance of pneumatic hard seal ball valve ‘s slide valve sleeve and spool clearance is very small. They are usually assembled into a whole. When there are mechanical impurities or too little oil, it is easy to jam. 3. Air leakage Insufficient pressure caused by air leakage will lead to difficulties in opening and closing the pneumatic hard seal ball valve. This is due to damage of the gasket or wear of the slide valve. Burnt coil, stuck slide sleeve and air leakage are the three common faults of pneumatic hard seal ball valve. Through the above introduction, if you encounter these three situations, you can quickly repair the pneumatic hard seal ball valve. Of course, the best way to prevent these problem is to solve them at the very beginning by find a reliable supplier and quality products. Xiamen Dervos is an API-Certified valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to all kinds of common valves such as gate valves, ball valves, globe valves, plug valves and butterfly valve, we also offer you the best actuators as long as our customers file their requirements. To learn more about our industry-leading products, contact us today.

What is the difference between a forging steel ball valve and a casting steel ball valve? The difference is mainly in the process of processing steel: Cast steel, produced by the casting method, is divided into cast carbon steel, cast low alloy steel, and cast special steel. A cast steel ball valve is formed by pouring liquid into a mold and then solidifying it. Alloy steel is the most common casting material and cast steel is mainly used to make parts that are complex in shape, difficult to forge or cut, requiring high strength and plasticity. The forging steel ball valve is a variety of ball valves made from forged steel and forged parts. Forged steel ball valves are stronger than cast steel ball valves and can withstand larger forces. Its plasticity, toughness, and other mechanical properties are also higher than the casting steel ball valve. That’s why for certain important mechanical parts, forged steel parts should be the first choice. Casting is something solidifying from the liquid while forging is a process of physical formation. Forged pieces, with good internal structure, good mechanical properties, and uniform grain organization, are ideal for important heavy parts. On the contrary, casting produces structural bias, structural defects. But casting has its own advantages. The production of complex parts is not easily done by forging, in which case it is easy and economical to cast the piece. Xiamen Dervos is an API-Certified ball valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to all kinds of common valves such as gate valves, globe valves, plug valves and butterfly valve , we also produce other unconventional valves as long as our customers file their requirements.

The bellow globe valve is particularly outstanding in terms of quality and life. It has a double seal to ensure zero leakage, and it is a safe and reliable standard for zero leakage of helium mass spectrometry. The number of bellows cycles can reach more than 10,000 cycles without damage, far exceeding the switch life of the ordinary shut-off valve packing seal several times. In addition, the bellows valve can prevent external dust from the valve body, ensuring the cleanliness of the medium. For example, under the conditions of high-purity silicon powder, pure oxygen, food, vacuum, etc., the performance of the bellows shut-off valve is very outstanding.   Ordinary shut-off valve packing and valve stems will have dynamic friction during the switching process, and the filler will be worn out and fail. Especially in the case of high temperature and low temperature, the filler will expand and contract as temperature changes. In summary, the advantages of bellows globe valves compared to conventional globe valves can be summarized as follows: 1. The bellows globe valve can meet the zero leakage standard of helium mass spectrometry detection, which is very safe and reliable. 2. The service life of the bellows cut-off valve is much higher than that of the ordinary globe valve. The packing of the ordinary globe valve is easy to be damaged and the replacement frequency is high. 3. Bellows Valve’s stem seal has a metal barrier that can be used in high-demand conditions such as oxygen, which requires absolute isolation inside and outside the valve. 4. The bellows valve has a double seal. When the bellows is intact, the filler is completely isolated from the medium, which protects the filler well and greatly prolongs the service life. Xiamen Dervos is an API Certified globe valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to Knife gate valve, we also produce other industrial pipeline valves, such as ball valves, check valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.