Classified by structural form: thin film regulating valve, spring thin film regulating valve, piston regulating valve, lever regulating valve, and bellows regulating valve.
To prevent leakage faults inside the pressure reducing valve, measures need to be taken from multiple aspects such as correct installation, daily maintenance, and operation management of the equipment. The following are specific methods:
1、 Correct installation and selection
Reasonable selection: Based on actual working conditions such as working pressure, temperature, medium and other parameters, select appropriate specifications and types of pressure reducing valves to ensure that their rated pressure, flow rate and other indicators meet system requirements, and avoid leakage caused by long-term overload or unsuitable working conditions of pressure reducing valves due to improper selection.
Installation specifications: Strictly follow the installation instructions to install the pressure reducing valve, ensuring that the installation position is correct, the inlet and outlet pipelines are firmly connected and stress free. During installation, attention should be paid to avoiding additional stress on the pressure reducing valve caused by installation errors in the pipeline, and to prevent the valve core and seat from being poorly sealed due to uneven stress.
2、 Media management
Medium cleaning: Install an effective filtering device in front of the pressure reducing valve to filter out impurities, particles, etc. in the medium, preventing them from entering the interior of the pressure reducing valve, scratching the sealing surface of the valve core and seat, and causing leakage. Regularly clean or replace the filter element to ensure the filtering effect.
Control of medium characteristics: For corrosive media, appropriate pressure reducing valve materials or corresponding anti-corrosion measures should be selected based on their corrosiveness, such as using corrosion-resistant valve core and seat materials or applying anti-corrosion coatings to pressure reducing valves. At the same time, it is necessary to control the temperature, humidity, and other parameters of the medium to avoid adverse effects on the sealing performance of the pressure reducing valve due to changes in the characteristics of the medium.
3、 Daily maintenance
Regular inspection: Establish a comprehensive equipment inspection system, conduct regular visual inspections of pressure reducing valves to check for signs of leakage, loose connections, and deformation of valve bodies. At the same time, check the wear of the sealing surface between the valve core and valve seat. If severe wear is found, repair or replace it in a timely manner.
Seal maintenance: Regularly replace the seals of the pressure reducing valve, such as O-rings, packing, etc., usually every 1 to 2 years depending on the material and usage environment of the seals. When replacing seals, it is important to ensure that the selected seals meet the required quality standards, are installed correctly, and avoid leaks caused by aging or damage to the seals.
4、 Operation management
Pressure stability control: Maintain system pressure stability and avoid excessive pressure fluctuations that may impact the pressure reducing valve. By installing suitable stabilizing devices such as accumulators and pressure regulating valves, the system pressure can be regulated and buffered, reducing the frequency of opening and closing the pressure reducing valve, lowering the wear of the valve core and seat, and preventing leakage.
Operating standards: Operators must strictly follow the operating procedures to operate and maintain the equipment. When starting and stopping the equipment, they should proceed slowly to avoid adverse effects on the pressure reducing valve due to sudden pressure changes. At the same time, unnecessary adjustments and operations should be avoided during the operation of the pressure reducing valve to prevent leakage caused by misoperation.