1、 Installation
1）. Preparation before installation:Check valve parameters: Carefully verify the diameter, pressure range, spring pressure, and other parameters of the steam pressure reducing valve to ensure they match the selected data.
Cleaning the pipeline system: Before installation, the pipeline system needs to be thoroughly cleaned to remove impurities such as welding slag, debris, and oxide scale. A 100 mesh steam filter can be installed in front of the pressure reducing valve. The filter screen is made of corrosion-resistant double-layer stainless steel filter, and the filter head is installed on the side to avoid water accumulation.
Prepare installation tools and materials: Ensure that the necessary tools for installation are complete, such as wrenches, screwdrivers, etc., and prepare suitable connecting fittings, gaskets, and other materials.
2. Installation position and direction
Horizontal installation is preferred: Steam pressure reducing valves are generally recommended to be installed on horizontal pipelines, with the valve cover facing upwards for easy operation and maintenance. They should be installed in the direction of the arrow on the valve body, so that they are consistent with the direction of fluid flow and cannot be installed in reverse.
Attention to straight pipe section requirements: There should be a certain straight pipe section before and after the installation of the pressure reducing valve. The length of the straight pipe in front of the valve is about 600 millimeters, and the length of the straight pipe behind the valve is about 1000 millimeters.
3. Installation of supporting facilities
Install bypass valve: Install an adjustable steam shut-off valve on the bypass pipeline of the pressure reducing valve. The diameter of the bypass valve should be the same as that of the pressure reducing valve, and it should be installed on the top of the pressure reducing valve as much as possible to avoid corrosion caused by water accumulation. Installation pressure
Gauge and safety valve: Install a pressure gauge before and after the pressure reducing valve for pressure setting and monitoring. At the same time, a steam safety valve should be installed downstream of the pressure reducing valve. The set pressure of the safety valve should be higher than the upper deviation of the pressure reducing valve, but lower than the maximum pressure at which the equipment or control valve closes.
Installation of steam water separator and drain valve: Install a steam water separator or drain valve at the inlet of the pressure reducing valve to reduce and eliminate water hammer and erosion, or install a drain valve at the outlet of the pressure reducing valve.
4、 Maintenance
1). Daily maintenance to maintain cleanliness: Regularly clean the dust, oil stains, and other dirt on the surface of the pressure reducing valve to prevent impurities from entering the valve body and affecting its performance. Check the connection parts: Regularly check the connection parts between the pressure reducing valve and the pipeline for looseness, leakage, etc. If there are any problems, tighten or replace the seals in a timely manner. Observing the operating status: During operation, closely observe the working status of the pressure reducing valve, including whether the pressure regulation is stable, whether the valve action is flexible, etc. If there are any abnormalities, they should be dealt with in a timely manner.
2). Regular maintenance and inspection of filters: Regularly clean or replace the filter screen before the pressure reducing valve to prevent impurities from blocking the filter screen and affecting the filtration effect. Check the seals and springs: Every certain time, check whether the seals of the pressure reducing valve are worn or aged, and whether the springs are deformed or broken. If there are any problems, replace them in a timely manner. Calibration of pressure gauge: Regularly calibrate the pressure gauge before and after the pressure reducing valve to ensure accurate pressure display, in order to facilitate correct adjustment and monitoring of pressure.
3). Long term shutdown maintenance emptying pipeline: When the steam pressure reducing valve is not in use for a long time, the front and rear shut-off valves should be closed to empty the steam and condensate in the pipeline, to prevent water accumulation from corroding the valve components. Apply protective oil: Apply protective oil to the exposed machined surface of the pressure reducing valve to prevent rust and store it properly.