25P斯派莎克导阀型隔膜式减压阀的简单介绍斯派莎克25P导阀型隔膜式减压阀,通过对同一主阀、不同型号异阀的多元化组合,可有效的控制蒸汽温度和/或压力。25P斯派莎克导阀型隔膜式减压阀的详细信息25P斯派莎克导阀型隔膜式减压阀,英国斯派莎克25P导阀型隔膜式减压阀,进口25P隔膜式减压阀 深圳龙晟凡而阀门有限公司代理销售斯派莎克SpiraxSarco减压阀,斯派莎克蒸汽减压阀,斯派莎克法兰减压阀,英国斯派莎克减压阀,英国SpiraxSarco减压阀,斯派莎克球墨铸铁减压阀,斯派莎克弹簧薄膜式减压阀。 斯派莎克25P导阀型隔膜式减压阀,通过对同一主阀、不同型号异阀的多元化组合,可有效的控制蒸汽温度和/或压力。 工作原理 主要特征 Many reducing valve problems are caused by the presence of moisture or dirt. A steam separator and strainer with fine mesh screen, if fitted before the valve, will help to prevent such problems. The strainer is fitted on its side to prevent the body filling with water and to ensure that the full area of the screen is effective. Large isolation valves will also benefit from being installed on their side for the same reason. All upstream and downstream pipework and fittings must be adequately sized to ensure that the only appreciable pressure drop occurs across the reducing valve itself. If the isolating valves are the same size as the reducing valve connections, they will incur a larger pressure drop than if they are sized to match the correctly sized, larger diameters of the upstream and downstream pipework. If the downstream pipework or any connected plant is incapable of withstanding the maximum possible upstream pressure, then a safety valve or relief valve must be fitted on the downstream side. This valve should be set at, or below, the maximum allowable working pressure of the equipment, but with a sufficient margin above its normal operating pressure. It must be capable of handling the full volume of steam that could pass through the fully open reducing valve, at the maximum possible upstream pressure. Pilot operation also allows the reducing valve to be relatively compact compared to other valves of similar capacity and accuracy, and allows a variety of control options, such as on-off operation, dual pressure control, pressure and temperature control, pressure reducing and surplussing control, and remote manual adjustment. Three of these variations can be seen in Figure 7.3.6. Direct acting and pilot-operated control valves can be used to control either upstream or downstream pressures. Pressure maintaining valves (and surplussing valves) sense upstream pressure, while pressure reducing valves sense downstream pressure. 深圳龙晟凡而阀门有限公司 |