We know that regardless of the type of valve, it should be operated strictly according to relevant specifications during the installation process. Below, the editor will take four common valves, namely check valves, safety valves, pressure reducing valves, and drain valves, as examples to introduce the safety precautions that need to be taken when installing valves.
1. Check valve: In order to prevent the medium from flowing back after the check valve leaks or fails, which may cause a decrease in product quality, one or two shut-off valves need to be installed before and after the check valve. If two shut-off valves are installed, they can be easily disassembled for maintenance.
2. Safety valve: When installing a safety valve, there is no need to set up isolation valves before and after installation. It can only be used in individual situations. If the medium force contains solid particles, which affects the safety valve's ability to close tightly after jumping, a gate valve with a lead seal should be installed before and after the safety valve. The gate valve should be in a fully open state, and a DN20 inspection valve to the atmosphere should be installed directly on the gate valve and safety valve. When the soothing and releasing wax and other media are in a solid state at room temperature, or when the temperature of light liquid and other media is lower than 0 degrees Celsius due to pressure reduction and gasification, the safety valve needs steam heating. For safety valves used in corrosive media, depending on the corrosion resistance performance of the valve, consider adding a corrosion-resistant explosion-proof film at the valve inlet. A gas safety valve is generally equipped with a bypass valve according to its diameter, which is used for manual venting.
3. Steam trap: There are two types of pipes on the side of the steam trap, one with a bypass pipe and the other without a bypass pipe. There are condensate recovery and condensate non recovery payment options. For steam traps with a drainage capacity of up to or other special requirements, they can be installed in parallel. The main function of a drain valve with a bypass valve is to discharge a large amount of condensate when the pipeline starts running. It is inappropriate to use a bypass pipe to discharge condensate when repairing the drain valve, as this can cause steam to flow into the return water system.
4. Pressure reducing valve: There are generally three forms of installation facilities for pressure reducing valves. Pressure gauges are installed before and after the pressure reducing valve to facilitate the observation of the pressure in front and behind the valve. And there is also a fully enclosed safety valve installed behind the valve to prevent accidents caused by the failure of the pressure reducing valve. When the pressure behind the valve exceeds the normal pressure, it will jump, including the system behind the valve. The drainage pipe is installed in front of the shut-off valve in front of the valve, mainly used for drainage and river flushing, and some use drain valves. The main function of the bypass pipe is to close the shut-off valves before and after the pressure reducing valve when it malfunctions, open the bypass valve, manually adjust the flow rate, and play a temporary circulation role for maintenance or replacement of the pressure reducing valve.
The above are the safety precautions that need to be paid attention to during the installation process of four common valves: check valves, safety valves, pressure reducing valves, and drain valves. If you want to learn more about the use of valves, you can continue to follow Wenzhou Diye Valve Fitting co.,LTD
Safety precautions to be taken when installing several common valves
2023 12/07