(1) It is used for an important adjustment system with high adjustment quality to improve the positioning accuracy and reliability of the regulating valve. (2) For the case where the pressure difference across the valve is large (â–³p>1MPa). The output force of the actuator is increased by increasing the pressure of the air source to overcome the imbalance force generated by the liquid on the spool, and the stroke error is reduced. (3) When the medium to be adjusted is high temperature, high pressure, low temperature, toxic, flammable, and explosive, in order to prevent external leakage, the packing is often pressed very tightly, so the friction between the valve stem and the packing is large. The positioner can be used to overcome the time lag. (4) When the medium to be conditioned is a viscous fluid or contains a solid suspension, the positioner can overcome the resistance of the medium to the movement of the valve stem. (5) For large-diameter (Dg>100mm) regulating valves to increase the output thrust of the actuator. (6) When the distance between the regulator and the actuator is more than 60m, the positioner can overcome the transmission hysteresis of the control signal and improve the reaction speed of the valve. (7) Used to improve the flow characteristics of the regulating valve. (8) When a regulator controls two actuators to implement split-range control, two positioners can be used to receive low input signals and high input signals respectively, then one actuator performs low-range action and the other elevation action constitutes points. Process adjustment. These points cannot be ignored in the construction of steel structure workshop Steel Structure Workshop,Steel Frame Workshop,Workshop Steel Structure,Steel Structure Warehouse Workshop Henan Jinming Metal Material Co., Ltd. , https://www.jinminghouse.com
The cost of the steel structure factory building is low, and the construction efficiency is high. It only needs to complete the basic design, and the construction can be completed immediately, and the factory building can be put into use quickly. However, when building a factory, we still have to pay special attention to the following points.
simple design
Different from other buildings, the steel structure factory building should still have a simple shape, generally designed as a rectangle, so that it is more convenient to use later and can also ensure the internal space. The layout can be carried out according to the terrain of the site, and attention must be paid to the specific design location of the workshop and whether there is a certain functional area division. Generally, the terrain slope of the factory building should not be greater than 5%, and the hilly slope should not be greater than 40%. Therefore, the construction should be carried out according to the local conditions, and the slope should be reasonable.
Construction location confirmation
As far as possible, the factory building should avoid locations such as earthquake faults, especially some locations prone to mudslides and landslides are not suitable for building factory buildings. If it is a valuable mining area, ancient tomb, etc., try not to build factories, etc. Before the construction of the factory building, it is necessary to do a good on-site inspection. If the local area is not suitable for the construction of the factory building, try to choose another place, so as to avoid the need to relocate the factory building later, which will be more troublesome and waste time and construction costs.
Reserved land for expansion
Steel structure workshops are very easy to expand, because with the increase in later construction requirements, many workshops may need to be expanded. Therefore, at the beginning of construction, a place for expansion should be reserved. At least the process requirements, transportation requirements, and whether there are other plant constructions should be considered.
Pay attention to construction inspection Steel Structure Workshop and Steel Structure Warehouse are relatively easy to construct and construct, so it is still necessary to pay attention to the need for safety personnel to inspect the site, and report in time if there are some installation problems. Moreover, after the construction is completed, there must be a construction inspection, and the stability of the plant must be ensured, so as not to affect the later use of the plant.
It is only necessary to select the appropriate materials for the construction of the steel structure factory building, and choose a suitable construction location, then basically the construction of the factory building can be completed immediately, and the factory building can also be quickly put into later use.
The role of the valve positioner