Protective measures to be taken when installing the valve
When installing the valve, in order to prevent metal, sand and other foreign matter from entering the valve and damaging the sealing surface, it is necessary to provide a filter and a flushing valve; in order to maintain the compressed air purification, a water separator or an air filter is required in front of the valve; In order to check the working state of the valve during operation, it is necessary to set the meter and check valve; in order to maintain the operating temperature, a heat preservation device is installed outside the valve; for the installation after the valve, a safety valve or a check valve is required; considering the continuous operation of the valve To facilitate the danger, set up a parallel or bypass system.
1. Check valve protection
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 adverse consequences such as accidents. One or two shut-off valves are provided 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
The block valve is generally not installed before and after the installation method, and 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 bleed wax is in a solid state at normal temperature, or is decompressed and vaporized to make the medium temperature such as light liquid state 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 relief valve installations are generally available in 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. Steam trap protection
There are two types of bypass valves on the side of the trap, and there are two types of bypass pipes. There are condensate recovery and condensed water, which are not recycled, and the drainage and other special requirements of the steam trap can be installed in parallel.
A trap with a bypass valve that acts primarily to discharge a large amount of condensate as the pipeline begins to operate. When servicing a trap, it is not appropriate to use a bypass to discharge condensate, which will cause steam to enter the return water system. Under normal circumstances, the bypass pipe may not be installed. Only the heating temperature has strict requirements, and the continuous production of the heating equipment is equipped with the bypass pipe.
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