Mehreen Alberts
Steam reducing pressure valves are valves that precise control the downstream pressure of steam and automatically adjust the amount of valve opening to allow the pressure to remain unchanged even when the flow rate fluctuates by pistons, springs or diaphragms 👍 The pressure reducing valve adopts the opening and closing parts in the valve body to adjust the flow of the medium, reduce the medium pressure and adjust the opening degree of the opening and closing parts with the help of the pressure behind the valve, so that the pressure behind the valve remains in a certain range, in the case of constant changes in the inlet pressure to keep the outlet pressure in the set set set range 👍 It is important to choose the right type of steam relief valve 😊 Do you know why steam needs pressure-reducing?
All steam control valves must have a strainer ahead of the valve. Steam lines frequently contain residual solid materials from the corrosion and other impurities. The strainer will filter the steam stream and prevent this material from lodging in the valve internals which would cause premature failure. The strainer should be rated for 0.020 perforated stainless steel mesh and never be mounted with the strainer segment in a down position. Rather, install the strainer segment in a horizontal position (see detail). This will prevent condensate from accumulating in the pocket and then passing through the control valve increasing the likelihood of internal erosion and premature failure. The Strainer will have a calculated drop across the unit. The equation to determine the pressure drop:
According to Durrell Pereira at coulton.com, boilers will typically work at high pressures, as low pressure operation will result in carryover of water. High pressure steam has lower specific volume, which will allow pipes to carry less weight. In effect, distribution of steam becomes easier and cheaper due to the’s havingad costing reduction in piping and insulation. Industrial process applications use steam at a lower pressure. The reason for this is that the steam at a low pressure has higher latent heat, which increases energy efficiency to a large extent. Steam pressure and temperature are related, and hence temperature is automatically controlled through the control of steam pressure. The reduction of steam pressure is also related to the required plant safety. Steam pressure can be controlled by using Steam Control Valve.
Steam is used in a large number of industrial applications. It is used for powering turbines to generate electricity and for food, chemical and other product processing. Steam is also used for cleaning, heating, and humidification. Most applications require some control, and steam control valves become an important part of the process. The major application of valves with steam is to reduce the pressure of the inlet steam for process application. In addition to controlling pressure, a steam valve can control temperature. Industrial processes frequently use steam at lower pressures. Since steam at a low pressure has higher latent heat, (which increases energy efficiency) and steam pressure and temperature are related, temperature is controlled through the control of steam pressure. Lower steam pressure will also provide improved plant safety. (revised by Tila Albright on August 24, 2021)
As per the specialists at spiraxsarco.com, because of the leakage problem associated with double seat valves, when a tight shut-off is required a single seat valve should be specified. The forces required to shut a single seat globe valve increase considerably with valve size. Some valves are designed with a balancing mechanism to reduce the closing force necessary, especially on valves operating with large differential pressures. In a piston-balanced valve, some of the upstream fluid pressure is transmitted via internal pathways into a space above the valve plug, which acts as a pressure balancing chamber. The pressure contained in this chamber provides a downforce on the valve plug as shown in Figure 6.1.4, balancing the upstream pressure and assisting the normal force exerted by the actuator, to close the valve. (last emended 26 days ago by Yasmine Caudill from La Paz, Bolivia)
Bert Mayfield at wermac.org, mentions how other impurities remain in the boiler water after treatment in the form of dissolved solids. Their concentration will increase as the boiler produces steam and consequently the boiler needs to be regularly purged of some of its contents to reduce the concentration. This is called control of total dissolved solids (TDS control). This process can be carried out by an automatic system which uses either a probe inside the boiler, or a small sensor chamber containing a sample of boiler water, to measure the TDS level in the boiler. Once the TDS level reaches a set point, a controller signals the blowdown Valve to open for a set period of time. The’s had losing lost water is replaced by feedwater with a lower TDS concentration, consequently the overall boiler TDS is reduced. (last emended 88 days ago by Cortland Starr from Bacolod, Philippines)
