Fanxianpu (Yunnan Natural Gas Chemical Plant, 657800) Key words: Regulating valve core safety device Gravity level transmitter patent 1, the control valve core security device (Patent No. ZL-92 220580 · 9) Introduction Kellogg synthetic ammonia The stems of the FRC-2, LRC-91, LRC-91C valves in the production plant are broken during operation. Although the FRC-2 spool breaks for more than a decade, its loss is enormous. Even if it breaks down, it only causes an emergency stop and does not cause an accident to widen. One day of maintenance also reduces the output by more than 1 million yuan. However, who can guarantee that the accident does not expand when it breaks? Regulating the valve core security device, is to solve the problem of regulating valve stem fracture design. Regulating the valve core of the security device has two important roles: First, to delay the stem rupture time, thereby enabling it to continue; Second, the stem in the rupture of the valve to work properly, is not afraid of its broken. Role of a: After the valve is put into use, the regulating valve core is subjected to the fluid unbalanced force to produce violent vibration. Especially when its natural resonance frequency and fluid vibration frequency, the vibration is very dramatic. In this case, over time, the valve stem and the valve junction will have fatigue, resulting in the stem and the valve core junction due to fatigue fracture. Obviously, the main cause of valve stem breakage is fatigue and resonance. Regulating valve core security device to make the valve core is a greater than its upward pressure on the gravity so that the stem and the valve core connection from the original tensile stress to withstand compressive stress. For compressive stress, the allowable compressive stress is many times greater than the allowable tensile stress. The place under stress is not prone to fatigue damage, thus solving the problem of fatigue damage. And then due to the support function of the security device, the valve core and the valve body become a whole, so that the valve core to a certain extent the cantilever flexible state becomes a relatively rigid body connected with the valve body, and the resonant frequency is changed , Consistent with the body, will no longer occur with the fluid resonance problem. Role two: the regulator valve spool increased security devices, although not prone to fracture, but there is still the possibility of rupture, the second role of regulating valve security device is the valve stem fracture, the support of its valve stem Core, spool will not drop due to gravity and close the valve. The supporting force of the security device is less than the thrust of the actuator so that the valve core can still operate normally under the support of the security device and the valve can be repaired at least when the overhaul is over. The utility model relates to a security device, in particular to a security device for regulating a valve core. Its characteristics is to increase the control valve set of security devices, so as to ensure that the stem will not fall off after the valve stem off the valve, interrupt production. The utility model has the advantages of simple manufacture, it can be used for the reforming of the regulating valve which has been used for share, and can also be used in the newly-produced regulating valve. Regulator valve security device, Yunnan Natural Gas Chemical Plant in 1989 in FRC-2 valve installed on the use of four years without exception, the valve stem has never been broken. In 1993, Luzhou Natural Gas Chemical Factory was installed on the FRC-91C valve and was operating normally. 2, the gravity level transmitter (Patent No. ZL-92 220579.5) Introduction High-real, such as the surface of the condenser; high corrosion, such as acid absorption tower level detection, both have great difficulty. With differential pressure transmission detection of high vacuum environment level, the diaphragm will be high real suction convex deformation damage. Therefore, liquid level detection like surface condensers is routinely used with buoy level gauges, whereas buoy level gauges are expensive and not easy to maintain. As acid gas absorption tower absorption zone, and corrosion, so the conventional differential pressure transmitter level detection, the maintenance of large, serious damage to the instrument. Similar to the above two cases of liquid level detection, the simplest and most effective method is the use of gravity level transmitter. The utility model relates to a transmitter, in particular to a transmitter for liquid level measurement. The existing level transmitter, a differential pressure, buoyancy, capacitance and gamma-ray and so on. These level transmitter for high temperature, high pressure, vacuum, corrosion and other environments under the level of detection, the instrument is not used, that is, the instrument can not be long-term stable operation, and then the ray is harmful to the human body, the price is high. The purpose of the utility model is to design a new type of liquid level transmitter for liquid level detection, which not only applies to the environment normally used by liquid level transmitters, but also to conventional liquid level change Send can not use the high temperature, high pressure, vacuum, corrosion and other environments.
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