What is the structure of diamond super wear-resistant ball valve? Where are they mainly used?

Application of Diamond Process in 1 Hard-sealed Ball Valve Coal gasification, polysilicon and silicone working conditions 1. Summary: With the rapid development of economy, people put forward new requirements and expectations for the rational utilization of energy, and it is very important to develop and utilize a new generation of clean and efficient new energy. Coal gasification technology is one of the key technologies to realize clean coal conversion. The chemical industry and energy system based on coal gasification has become a world hotspot for efficient, clean and economical utilization of coal resources. As the leader of coal chemical industry, the gas loading terminal has a huge investment, and most of the high-demand valves in special locations are imported, which is expensive and has a long delivery cycle. The use of these valves under this working condition is directly related to the safe production and operation of gas loading and unloading terminals. 2. Working condition characteristics: 1. The lock hopper system of slag lock valve is the most important slag removal system in pressurized gas equipment of coal water slurry or dry pulverized coal entrained flow bed, which is mainly composed of slag tank, slag lock valve, slag lock valve and flushing water tank, and adopts automatic circulation control. Numerous hard particles, large and small, in the slag-water mixture flow at high speed under the system pressure of 4. 1-6.5 MPa, which causes great impact and serious friction on the valve seat, stem and ball, thus causing serious wear and tear, making the valve unable to open or close tightly. In addition, the slag-water mixture itself is corrosive, which accelerates the damage of the valve. However, the ash in the slag-water mixture is easy to deposit and adhere to the surface of the ball, and even tiny ash-2 slag will invade the sealing surface between the valve seat and the ball, causing the valve seat to fail, making the valve leak or even unusable. 2. In the installation of black water valve gas, several black water regulating valves are installed from the bottom of gasifier to gasification high-temperature water heater and from the bottom of washing tower to high-temperature water heater. These control valves have high working temperature, large pressure drop and the highest ash content, and should be able to withstand high flow caused by pressure drop through the valves, as well as cavitation of dissolved gas in flash evaporation, vaporization of water and corrosion and wear caused by coal ash particles. Especially in the first flash, the black water is directly reduced from high pressure to medium and low pressure through the flash valve. Because a large amount of process steam is flashed out, the material flows through the throttling element of the flash valve at a very high speed, causing serious wear. 3. Pulverized coal valve In the process of pulverized coal gasification, the delivery and adjustment of pulverized coal directly affect the start-up and operation of the charging device. In the process of powder transportation, the powder constantly washes and impacts the sealing surface of the valve, peeling off layer by layer, which is extremely worn and frequently replaced. Third, technical improvement: Newkin brand introduced and developed diamond ball valves for coal gasification according to the special working conditions of coal gasification, and adopted special surface treatment technology (diamond high vacuum laser cladding technology), with surface hardness above HRC78, service temperature of 650℃~750℃ and friction coefficient of 0.03~0.05, which made the service life of wear-resistant ball valves on gas dressings reach supersonic jet level 3. The spherical surface treated by diamond also has good self-lubricating properties of anti-friction and anti-erosion. Diamond super wear-resistant diamond ball valve is used in very harsh coal gasification conditions such as high temperature and high pressure, high-speed medium, high-frequency switch and a large number of solid particles. According to the special working conditions of coal gasification, Shanghai Newkin Company made the following improvements to the design structure of the traditional hard seal ball valve: 1. The solution to the leakage of the outer tank accurately locates the valve stem to avoid the uneven wear of the packing caused by its lateral displacement. The combination of leaf spring preloading packing gland and double sealing ring with elastic compensation provides excellent sealing performance of valve stem and avoids leakage of outer pool under extreme environment and working conditions. 2. Excellent sealing performance adopts unique ball milling process. By rotating the ball and grinding tool in different directions in space, the surface of the ball reaches absolute roundness and smoothness. The sealing surface of the valve seat adopts a wider spherical sealing structure, which can reduce possible nicks and scratches and minimize the damage rate of the valve seat. The sealing performance of the valve completely meets or exceeds the standard requirements. The sealing grade reaches VI (zero leakage). 3. The ball and valve seat meet the requirements of self-shearing and self-cleaning. The sealing pair adopts all-O-ball, double valve seats and leaf spring loading structure; The sealing surface of the valve seat is designed as scraper structure (patented by Newking Company), which can remove 4 silicon powder stuck on the spherical surface when the valve is opened and closed, and has the functions of self-shearing and self-cleaning; The leaf spring adopts double graphite sealing structure. When the valve is sealed, the leaf spring is also sealed, so the medium will not enter the deformation cavity of the leaf spring, and the leaf spring will not be blocked and fail, which can meet the loading requirements for a long time and improve the durability of sealing performance. 4. Prevent the valve stem from flying out. The valve stem is designed with an anti-blow-out structure, which can ensure that the valve stem will not be blown out by the medium even under extreme conditions such as abnormal pressure increase in the valve cavity and failure of the packing pressure plate. The valve stem adopts the bottom-mounted structure design of inverted seal, and the sealing force of inverted seal increases with the increase of medium pressure, thus ensuring the reliable sealing of the valve stem under various pressures. 5. In order to prevent the valve from expanding and dying at high temperature, the ball and valve seat will easily expand and die due to the thermal expansion surface, and the valve cannot be opened. The metal hard sealing ball valve adopts the unique leaf spring loading sealing structure of the utility model, and the thermal expansion between parts can be absorbed by the leaf spring or spring at high temperature, thus ensuring that the valve will not expand and die at high temperature and can be opened flexibly at high temperature. 6. Perfect and optimized fire protection structure design: the valve sealing surface adopts metal hard sealing structure, the filler adopts flexible graphite, and the gasket adopts stainless steel+flexible graphite structure. Therefore, the valve can ensure reliable sealing even in the case of fire. 5. Anti-static function: The parts of the valve are closely connected, which naturally forms an electrostatic channel, so it is unnecessary to design an electrostatic channel to protect the valve. Double blocking function: diamond ball valves generally adopt the sealing structure of the ball front seat, and the two valve seats of the ball valve can independently cut off the medium at the inlet and outlet ends to realize the double blocking function. Anti-misoperation: it is equipped with a 90-degree switch positioning piece with a keyhole, which can be locked as needed to prevent misoperation. Installation platform: Diamond ball valves are equipped with a bracket platform for installing driving gears. Worm gear, pneumatic gear or electric gear can be installed conveniently by driving the mounting bracket. Surface-treated diamond coating sprayed with tungsten carbide POD morphology (equipment: POD2 pin-and-disc wear tester, load 20N, wear time 1800s) Wear rate: 6.00E- 17 2.40E- 15 microhardness (load 50g) Equipment: MH-6 microhardness tester 2776HV/. From the POD wear tester, it can be seen that the wear mark of sprayed WC is obviously deep, while the diamond coating has almost no wear depth after 1800s wear, and the wear resistance is good.