The pressure of the fluid in the pipeline is higher than the valve pressure
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I have a question: if a pipeline is used to transport a fluid at a pressure of 1.8–2.0 MPa, and the valves installed on that pipeline are rated for only 1.6 MPa, could this cause damage to the valves? Could it lead to leaks in the valve seals or even breakage of the valve discs? If anyone knows the answer, please let me know. Thank you
Yes, if the pressure of the fluid in the pipeline exceeds the valve’s rated pressure, it can cause damage to the valve. In the situation you mentioned, since the pressure in the pipeline (1.8–2.0 MPa) is higher than the rated pressure of the valve (1.6 MPa), this may lead to problems such as leakage at the valve packing and failure of the valve disc. It is recommended to use valves that meet the pipeline pressure requirements to avoid potential risks and damage. .
The pressure of the fluid in the pipeline is higher than the valve pressure
In the short term, this situation will cause internal leakage in the valve, while in the long term it will cause irreversible damage to the valve, rendering it ineffective. Leakage from the packing housing does not occur in products that meet the standards; safety margins are built into the valve design. For valves operating at 1.6 Mpa, the pressure resistance of the housing packing is designed with a 1.5-fold safety margin. Valve plate fracture should also not occur.
It’s too risky even to mention this; it’s a design flaw that needs to be corrected promptly. For such operating conditions, valves with PN25 rating should be used at the very least
What size should the pipe be? Generally, a pipe diameter of less than DN100 is sufficient. Since the nominal pressure of the valve is PN40 or less, its components are shared
The nominal pressure should be one pressure grade higher than the operating pressure. Select the corresponding nominal pressure based on the material’s temperature and pressure rating table. The medium is at room temperature, PN25 is sufficient ； Above 100 degrees Celsius, PN40 is sufficient. Specifically, refer to the material temperature and pressure rating table.