In order to maintain the compressed air purification, a water-oil separator or an air filter should be installed in front of the valve; in order to check the working state of the valve during operation, the instrument and the check valve need to be set; in order to maintain the operating temperature, a heat-insulating facility is installed outside the valve; After the valve is installed, it is necessary to install a safety valve or a check valve; in consideration of the continuous operation of the valve, it is convenient for danger, and a parallel system or a bypass system is established.
1. Protection device of check valve: In order to prevent the leakage of the check valve or the backflow of the medium after failure, the quality of the product is degraded, causing accidents and other adverse consequences. One or two shut-off valves are arranged before and after the check valve. If two shut-off valves are provided, the check valve can be easily removed for repair.
2. Safety valve protection: Generally, there is no isolation valve before and after the installation method, which can only be used in individual cases. If the medium force contains solid particles, which affects the safety valve after the jump cannot be closed, install a gate valve with a lead seal before and after the safety valve. The gate valve should be in the fully open state. The gate valve and the safety valve are directly installed. Check valve for DN20 to the atmosphere. When the medium such as the ventilated wax is in a solid state at normal temperature, or is decompressed and vaporized so that the temperature of the medium such as the light liquid state is lower than 0 degrees Celsius, the safety valve requires steam heating. Safety valves for corrosive media, depending on the corrosion resistance of the valve, consider applying a corrosion-resistant explosion-proof membrane at the valve inlet. The gas safety valve is generally provided with a bypass valve according to its diameter as a manual venting.
3. Protective equipment for pressure reducing valves: Pressure reducing valve installation facilities generally have three forms. Pressure gauges are installed before and after the pressure reducing valve to facilitate observation of the pressure before and after the valve. There is also a fully enclosed safety valve behind the valve to prevent the valve from failing after the pressure of the valve exceeds the normal pressure, including the system after the valve. The drain pipe is installed in front of the valve in front of the valve, mainly for flushing the river, and some use a trap. The main function of the bypass pipe is to close the shut-off valve before and after the pressure reducing valve after the failure of the pressure reducing valve, open the bypass valve, and manually adjust the flow to temporarily discharge the pressure reducing valve or replace the pressure reducing valve.
4. Protection device of steam trap: There are two kinds of bypass pipes on the side of the steam trap and no bypass pipe. There are condensate recovery and condensed water not to be paid for recovery, and the drain valve and other special requirements of the steam trap can be connected in parallel. Formal installation facilities. A trap with a bypass valve that acts primarily to discharge a large amount of condensate as the pipeline begins to operate. When servicing the trap, it is not appropriate to discharge the condensate with the bypass pipe, which will cause the steam to enter the return water system.