Henan dark horse Industrial Co., Ltd. to develop their own research and development, to fill the gaps in the domestic valve product innovation - Double QQ double hemisphere valve is carefully weighed ball valve, butterfly valve, valve and other valves advantages and disadvantages under the premise of similar products from Germany to develop Of all domestic innovative products, the appraisal concluded that: ... in some aspects of the use of performance superior to gate valves, globe valves and ball valves and other similar products, can be widely used in petroleum, chemical, power and metallurgical industries ... Ministry of Chemical Industry Science and Technology Achievement Certificate, the core technology is a national initiative, its unique design, novel structure, has been five patents. Products put on the market for five years, by the customer's approval, the scope of orders continued to expand, indeed in different occasions to replace the ball valve, butterfly valve, gate valve and other valves, what better than where? First, the use of eccentric structure - wedge tight principle. The valve body and the spool center of rotation (ie, the stem axis) is offset by a radial dimension from the geometric center of the sealing spherical surface of the spool and also has a biased dimension in the valve body passage axis with the valve seat sealing face. The sealing pair is Metal-metal external force contact, the valve relies on two eccentric to achieve self-locking off, eccentric reasonable choice makes self-locking angle is less than the friction angle, self-locking angle selection is too small to close easily open special difficulty, the angle selected, Although the opening force is small, but the closing moment increased rapidly, the test bench repeated tests to determine the two eccentric with a reasonable amount of essential, reliable self-locking properties to ensure tight seal. This is the core technology of the semi-ball valve, from the principle of the structure through the means of manufacturing to achieve the best seal, the ball valve, butterfly valve, gate valve, globe valve, etc. are indeed inferior. Second, easy to achieve and maintain zero long-term leakage. Spool and valve seat seal is spherical contact, by eccentric to achieve self-locking, sealing pair in the whole process of opening and closing almost no contact, only in the opening and closing moment, will contact and the gate to achieve zero leakage, to ensure the static and dynamic seal Department without any leaks. Fouling on the valve seat or other deposits, spool in the process of contact with the seat, with a strong ability to remove scaling. The gate valve sealing surface in the opening and closing of the frequent reciprocating motion, mixed media scaling precipitation in the lower part of the body cavity, the valve is completely rely on positive pressure to achieve sealing, the seat on the scale without cleaning capacity, the two packing Often repeated wear and tear easily lead to gate valve, valve leakage within the leak. Ball valve seal is squeezed by the seat long-term spherical, it is certainly faster wear than the semi-ball valve, butterfly valve seal is rubber-based, it is far more than the semi-spherical valve, ball valve, gate valve metal seal performance. After long-term use of the semi-spherical valve, the valve seat will also produce a slight wear, it can be adjusted to continue to use, the stem and packing valve stem rotation during opening and closing only 90 °, there are signs of leakage, and then compress the packing gland Bolt a little, you can achieve no leakage at the packing, and other valves are still a small leak barely used, a large leak valve. China Aluminum Guangxi branch (working medium: red mud slurry, strong alkali solution) said in the use of the report, "... ... the valve operation (open, close) easy and convenient, easy maintenance, sealing performance is good, compared with ordinary gate valve Long service life, ... has been in use since July 2001 (nearly three years of work - Editor) did not find any mechanical problems and leakage problems, from the labor intensity, energy saving and leakage are welcome. " Third, the operation is extremely lightweight. Half-ball valve opening and closing of the entire process, the seal almost all without damping idle state, the external force is only in the opening and closing moments off or compressed, and the stem simply rotated 90 ° light and fast, of course, light operation. Ball valve during opening and closing process by the valve seat at both ends of the holding force under the operation, it is larger than the half-ball valve opening and closing torque, the larger the nominal diameter opening and closing torque more obvious difference, the opening and closing of the butterfly valve is to overcome the deformation of the rubber To achieve more torque. The gate valve, globe valve operating time is long and strenuous. Zhengzhou Gas Company in the use of the report said: "Since 99 years, has purchased from your company its production of 'dark horse' brand hemisphere valve Hundreds of Taiwan ..., has not found quality problems, ..., the company's products in the structure than ordinary valves Newer and lighter in operation than ordinary ball valves ...... "; The report of the use of China Aluminum Shanxi Branch said:" ... since the use of your unit product BQ double eccentric hemisphere valve has been used with the original butterfly valve, gate valve, Y-type Compared to the valve, the switch can be put in place, light and flexible, easy to use, reducing labor intensity, welcomed by the workers ... "! Fourth, long life. The sealing pair is bimetallic, and the alloy for different uses is built up on the matrix. After the special heat treatment, the mechanical properties and physical and chemical indexes reach the best condition to meet different working conditions (strong abrasion, rapid scouring and serious corrosion) In the needs of the valve seat hardness slightly lower than the spool, different materials and different heat treatment process, when necessary, the hardness of the seal up to HRC53 above, but also resistant to 560 ℃ high temperature. Practice has proved that its anti-corrosion and anti-seizure ability is 6 times the stainless steel seal pair, the valve opening and closing thousands of times without failure, extending the service life. Wuhan Iron and Steel Company in the use of the report said: "In the first phase of bituminous coal procurement your company's hand, electricity, pneumatic hemisphere valve, no fouling during use, switch flexible, good sealing performance, which used in the main line Half-ball valve and the introduction of foreign equipment is better, and the price of various types of valves is only equivalent to 15-20% of the price of similar foreign equipment for the first phase of Wuhan Iron and Steel Blowing a project to save money, ... ... for nearly three years, in good condition, Save costs, reduce equipment failure, reduce the labor intensity of workers, by ironworks leaders and managers alike. " Another example: Beijing Shougang said in the use of the report: "I plant in the new five-powder coal system test installed 'dark horse' brand semi-spherical valve to replace the original ball valve has been used for more than 10 months, the use of proven products with open flexible, Good sealing, strong pressure fluctuation on wind source, stable use, strong adaptability to winter use, suitable for use under harsh working conditions. Our factory requires the switch of production and processing every 20 minutes Once, so more than six months during the test has been opened and closed nearly 10,000 times, there is no anomaly, to meet the requirements of the pulverized coal system ... ... ". Fifth, a wide range of applications. My company's multi-series semi-spherical valve is widely used in non-ferrous smelting, gas, steel and coal dust injection, power slag, harmful gases (hydrogen sulfide, phosgene, etc.) and oil (heavy oil, crude oil, residual oil Etc.) Smelting and conveying. The reason why it is widely used, mainly because the sealing pair welding different alloys, making it a bimetal, valve, stem and other major parts using the required materials to meet different conditions, constitute our company a variety of products series. Black Horse brand BQ double eccentric half-ball valve operation light and flexible, long life, wear and tear can automatically compensate, eccentric wedge tight to automatically remove scaling, to achieve zero leakage. Its wide adoption can greatly reduce downtime and reduce the operating costs of enterprises, in many occasions to replace the ball valve, gate valve, globe valve has become an inevitable trend.