The cheapest valve is not always the best choice. Look at long term usage and maintenance free operation when considering a valve. Look for quality materials used in the construction. Sometimes, it may cost you 1000's times more to replace a cheap defective valve that the extra you pay for a good quality one to start with.
~Rocky S, Design Engineer, Irvine, CA
Revise weight, capacity of sealing, materials resistant to design conditions (P&T), losses through the valve (Cv factor), noise in Db when valve in closing (if it´s supplied in technical information).
~Alfredo Rendueles, Engineering Consultant, Maracaibo, Venezuela
Know pressure, temperature, flow and PSI drop requirements. Know what type of Check Valve is preferred for a specific application.
~John B, Marketing/Sales, Carlsbad, CA
Do your homework, because most of the people selling you the product won't be able to answer your questions down the road.
~Mark C, Marketing/Sales, Farmington, NM
Do your homework, check out manufacturers' claims by following up with installers, operators (users) and maintenance people.
~Nic T, Research & Development, Johannesburg, South Africa
Confirm that the selected check valve is correctly matched to the pressure ratings of the other components in the system.
~Ed C, Engineering Consultant, Houston, TX
Use automated ball valve instead. Don't rely on check valves. Engineer them as only a back up feature.
~David F, Project Manager, San Diego, CA
Always look at resetting ability, and effects of corrosive atmospheres
~Steve B, Engineering Consultant, Barnetby, UK
Select the correct type of check valve for the application
~Bob C, Design Engineer, Sheffield, UK
Pay close attention to cracking pressure
~Tom K, Purchaser, Leitchfield, Grayson