We know that no matter what kind of valve, you should strictly follow the relevant specifications during the installation process. The following editors take the four common valves, such as check valve, safety valve, pressure reducing valve and trap, as examples Introduce the safety matters needing attention when installing the valve.
1. Check valve: In order to prevent the check valve from leaking or failing to flow backward, which will cause the product quality to decrease, one or two shut-off valves must be set before and after the check valve. If two shut-off valves are provided, it can be easily disassembled. Check valve for repair.
2. Safety valve: It is not necessary to install a shut-off valve before and after the safety valve is installed. It can only be used in individual cases. If the medium force contains solid particles that affect the safety valve and cannot be closed tightly after taking off, install a safety valve before and after. Gate valve with lead seal only. The gate valve should be fully open. The gate valve and safety valve are directly equipped with a DN20 inspection valve to the atmosphere. When the medium such as the soothed wax is solid at normal temperature, or when the temperature of the medium such as the light liquid is lower than 0 degrees Celsius by decompression and vaporization, the safety valve needs steam tracing. Safety valves for corrosive media, depending on the corrosion resistance of the valve, consider adding a corrosion-resistant explosion-proof film at the valve inlet. The gas safety valve is generally provided with a bypass valve according to its diameter for manual venting.
3. Trap valve: There are two types of bypass pipes on the side of the trap valve: bypass pipe and non-bypass pipe. There are condensate water recovery and condensate water non-recovery payment. The traps with drainage capacity and other special requirements can be used in parallel Installation facilities. With the bypass valve, the main function of flowing water is that when the pipeline starts to run, flowing water can be used to discharge a large amount of condensate. When servicing traps, it is inappropriate to use a bypass to drain condensate, as this will allow steam to escape into the return water system.
4. Pressure reducing valve: There are generally three forms of pressure reducing valve installation facilities. Pressure gauges are installed on the front and rear of the pressure reducing valve to facilitate observation of the pressure before and after the valve. In addition, there is a fully enclosed safety valve behind the valve to prevent the pressure relief valve from taking off when the pressure exceeds the normal pressure after the failure of the pressure reducing valve, including the system behind the valve. The drain pipe is installed in front of the shut-off valve in front of the valve, which is mainly used for drainage river flushing, and some use traps. The main function of the bypass pipe is to close the shut-off valves before and after the pressure reducing valve fails, open the bypass valve, and manually adjust the flow to play a temporary circulation role in order to repair or replace the pressure reducing valve.
The above are the safety precautions that we need to pay attention to during the installation of four common valves: check valve, safety valve, pressure reducing valve and trap valve. Valve Co., Ltd.