When the process medium involves hydrochloric acid, sulfuric acid, chlorine, or other highly corrosive substances, standard metal valves fail rapidly. This is where PTFE lined safety valves become indispensable, and understanding the DN50 price range helps procurement teams make informed decisions.The main safety valve product names of China safety valve Network include:Gas Specific Fall Lift Safety Valve,GA49H-DN20 Pulse Safety Valve,High Temperature and Pressure Fall Lift Safety Valve,Hydraulic Safety Valve,Impulse Safety Valve,Impulse Spring Safety Valve,JIS Safety Valve,Main Safety Valve,Overflow Valve,Oil Refining Specific Safety Valve.

A PTFE lined safety valve differs from conventional safety valves in one fundamental way: all wetted surfaces are covered with a fluoropolymer lining, typically PFA or F46, with thickness ranging from 2.5 to 3 millimeters. The carbon steel or stainless steel body provides structural strength and pressure containment, while the lining isolates the metal from the corrosive medium. This design approach delivers the corrosion resistance of exotic alloys like Hastelloy at a fraction of the cost.

For DN50 specification, which corresponds to a 2 inch nominal pipe size, the price for a PTFE lined safety valve from Chinese manufacturers typically falls in the range of 3800 to 4400 RMB per unit. This pricing reflects a spring loaded, full lift, closed bonnet design with flanged connections conforming to standard dimensions. Several factors influence the final price: the lining material grade, the pressure rating, whether a PTFE bellows is included for additional stem protection, and the specific certification requirements.

The DN50 size is particularly common in chemical processing because it matches typical pipe diameters for reactor relief lines, storage tank venting, and pump discharge protection. A DN50 lined safety valve with F46 lining operates effectively at temperatures up to 130 degrees Celsius, while PFA lining extends the upper limit to 170 degrees Celsius. For applications involving chlorine or liquid chlorine, the closed bonnet design ensures that discharged media is contained and routed to a safe location rather than released into the atmosphere.

When evaluating suppliers, buyers should verify the lining thickness and adhesion quality, confirm the valve meets relevant pressure equipment standards, and request material certificates for all wetted components. A properly manufactured PTFE lined safety valve protects both the process system and the personnel who operate it. For corrosive media service in DN50 line sizes, the price is modest compared to the cost of valve failure.

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