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Introduction of hydraulic valve
The gas network of the gas-making system is the gas-generating central nervous system, which strictly executes the signal instruction sent by the microcomputer and transmits power to drive the oil pressure valve to switch the gas flow to complete the circulation work. Actuator hydraulic valve actuation, closed-door motion accuracy, tightness of the closure, open path utilization, opening and closing in place speed and reliability and operational efficiency. All these have a direct impact on the safety and operational efficiency of the gas stove. To ensure and improve the performance and quality of hydraulic valves, valve design requirements for improvement, production and material selection, etc. must mention the grade, the grade. From the gas valve application point of view, the process valve, which belongs to the full open, fully closed valve, requiring open to be through, close to tight. Its role is to switch the gas, to achieve the phase transition connection, the formation of circulating gas. With the continuous operation of the gas furnace capacity improvement, the new production features have been on the valve performance and quality put forward higher requirements. Therefore, every manufacturer should pay more attention to the performance and quality of the hydraulic valve. In the past people only pay attention to whether the valve can be closed and service life. The new idea of ​​looking at this issue is that the above two issues are important, but only stressed the above two aspects is not enough, but also focus on the valve opening degree, that is, effective path utilization. This is a new problem that has been found during the development of gas-making technology and another productivity constraint on the operating efficiency of gas stoves. Nearly 10 years of gas technology transformation, has been focused on expanding the diameter of the gas furnace and transform the aspect ratio, and simplify the process of thickening of the pipeline. Designed to improve gas production efficiency, improve single-furnace capacity to adapt to the expanding system capacity, eliminating the small row of furnaces, low thermal efficiency. However, some manufacturers after the expansion of process piping, hydraulic valve matching is not correct. Resulting in the resistance did not reduce the design requirements, investment efficiency did not fully play. The reason is that the design of the hydraulic valve is not enough to make it less than the opening degree, so the valve plate occupies a certain channel area, resulting in resistance to form a card neck phenomenon. To solve this problem, we must start with the improvement of the design plan. To improve the effective through the utilization rate, reduce resistance, improve operational reliability and reduce the failure rate as the goal. A series of improvements have been made to the hydraulic gate valve, seat plate valve and butterfly valve. 1, the improvement of the hydraulic gate valve (hereinafter referred to as the gate valve) Nowadays, the gate valve in the small nitrogen fertilizer industry gas system is still more applications. Mostly used as a hair dryer valve, nearly 70% of the single-furnace system is the use of a gate valve, plus a hydraulic butterfly valve into a valve for the location of the furnace valve. Due to the gate valve on the duct was a straight line connection will not be generated due to the installation of the valve bending angle, blowing resistance should not arise. However, the blow resistance is small? The original design of the gate valve there are two aspects of the deficiencies, one is the internal structure of complex and easy to fall off high failure rate, high maintenance costs. Second, the gate stroke is not enough, open when the gate has 20% -25% suspension at the valve port, not mention to generate resistance. Improvements: (1) improved internal parts, the original design of the number of pieces, complicated structure, connection and fastening methods are not reasonable. The actual production due to the failure of the blower gate valve to affect the production of the highest probability, the old gate valve trim a total of 12 pieces: gate two, a spool, a wedge, up iron block two, connecting earrings two Pieces, four fastening bolts, complex structure, demolition, loading are very difficult. After the improvement, the inner part is divided into six pieces, reduced in half. By two self-owned child, the claw buckle gate and an upper wedge, a lower wedge. Four pieces by clever hook each other, linked to a set. When opening and closing up, shrinking flexible and reliable. (2) the stem and the upper wedge connection improved, the original connection, the lower end of the original design stem "t" -shaped structure, and the upper end of the spool "." , Easy to fall off. Improvement method: the upper wedge is provided with an internal thread hole. Valve stem to remove the "t" -shaped head, the lower end of the screw head and the upper wedge fastening as a whole, and then off the sales. Improved Features: Simple structure, easy to fall off, long service life, failure rate reduced by more than 60%. (3) valve plate stroke improvement, the valve plate height is not enough to directly affect the hair flow, which is equal to the narrow path. So that the effectiveness of hair down, hair time extended. The improved design not only enables the valve plate to be opened and added completely, but also prevents over-positioning measures, so that the problems existing in the old-style design scheme can be effectively solved. 2, the new hydraulic seat valve (hereinafter referred to as seat valve) seat valve is currently the most widely used gas system, the largest amount, as large as dn1000, small to dn20. Specifications, at the location of the safety butterfly valve, seat valve can be used for other valve positions. Therefore, seat plate valve to improve the significance of greater. Improvement method: (1) the first improvement of the seat plate valve: the cover from the "flat" shape, to "convex" shape. A "hiding place" valve plate has been designed for the valve plate which is fully retracted into the cavity on the bonnet when it is opened. First, open the passage to increase the flow area, and second, to avoid the gas entrainment of dust erosion. The original design of the valve plate is suspended in the body of the gas channel open, possession of an effective path of about 20%. Increase the gas resistance, affecting the gas production efficiency, improve the utilization of the path 100%. (2) to improve the sealing form: bevel seal has been used for many years, concluded that the sealing adhesion of foreign matter, often scale material in the local scope, and easy to flake off affect the sealing performance. The sealing surface is reduced to the linear form, and the sealing surface force increases. Not easy to produce foreign body adhesion on, off impact from grinding, self-healing effect. Extended use of the sealing surface automatically widened, the sealing effect to maintain long-term. 3, the hydraulic butterfly valve to improve the way (hereinafter referred to as the butterfly valve) Hydraulic butterfly valve earlier known as the "safety barrier", the butterfly valve is actually a linkage valve, the structure is a butterfly valve plus a small vent valve. The role of the damper is closed, the pressure between the two valves can be released by letting go of empty, play a role in ensuring safety. Due to its particular importance, now called "safety butterfly valve", the reliability of the valve directly affects safety in production. Requirements must have airtightness and reliability, the original design defects exist high failure rate. Mainly easy to sell off, off, travel is not enough, lax and so on. The problem is that the original design of the main butterfly shaft for the two "axle" were fixed on both sides of the disc, the structural strength of the failure rate caused by high. Often the external part of the normal work, but the disc does not move without air into the furnace, the reason is not easy to find. Improved method: The main shaft is replaced by a bold shaft through the disc center, high structural strength, accurate positioning, good sealing performance, reliability, failure rate decreased by 70% year on year. So as to play a strong guarantee of safety. 4, to improve the quality of the material to meet the conditions of today's enhanced production, wind speed, scouring power and inferior coal gasification, the downlink temperature is high. Extend the life of hydraulic valves and improve the level of continuous long-term operation. The main components of the hydraulic valve need to improve the quality of materials. Improve crack resistance, wear resistance. At present, for the hydraulic valve buffer hydraulic cylinder has been applied in some manufacturers. Due to the buffer cylinder in the valve near the closing place, suddenly slow down the piston rod spit speed, the valve plate and valve port to reduce the impact, thereby reducing the sealing surface wear and tear. At the same time, the impact force of the crosshead and other connecting components is also reduced, thereby reducing the failure rate and prolonging the use period. In addition, the hydraulic cylinder seal packing has also been greatly improved, PTFE packing filler life increased by several times than the original, is also to extend the use of the cycle, to reduce the failure rate in the direction. These two improvements have high application value and rapid promotion speed and will be widely applied in the future. The basic body part of the original basic ht-zo ordinary cast iron, replaced h h 250 cast iron can meet the needs of heat. Some plants will be key parts such as the location of the dust before the use of the upstream valve, heat recovery valve plate, valve ring, stem to stainless steel. More extended service life, it is very helpful. General position of the seat plate valve seal with ductile iron will be able to meet the need, but should not use ordinary cast iron. 5, Conclusion Hydraulic valve performance, structure, material improvement, mainly reflects the following two aspects of great significance. (1) Make full use of effective path by improving the lifting height when the valve plate is opened. So as to eliminate the existence of valve resistance for many years, the corresponding reduction in system resistance. Make the gas stove hair and gas production efficiency increased accordingly. Equivalent to the Du Pont Ducao 100 coffee around the path. (2) After the improvement, the reliability of the hydraulic valve is improved, the failure rate is obviously decreased, the safety performance of the gas furnace is improved, and the continuous operation capability is enhanced. Particularly suitable for today's situation to improve the level of continuous production. Hydraulic valve in the gas system share is relatively small, more should be more than the performance in the matching, than the quality, reliability. Otherwise, if a hydraulic valve in production fails, the entire furnace will not work. More likely to cause high oxygen content, partial explosion or a serious accident, every hydraulic valve in the gas system is a key component. Visible, hydraulic valve performance, quality and reliability, directly and largely affect the gas production efficiency and safety and energy saving. All enterprises should take this issue seriously.