Parker designs FB bellows valves for high-temp instrumentation uses
August 15, 2013 – Parker Hannifin has introduced its FB series of bellows valves, designed specifically for instrumentation applications requiring higher temperatures and pressures in the power industry. Externally pressurized, the bellows seal affords the product its atmospheric sealing capability and features a pressure rating of 2500 psig (414 bar) CWP (cold working pressure), says Parker. A secondary packing system acts as a backup seal above the primary bellows seal, which is available in a choice of Grafoil or PTFE. The Grafoil packing features temperature ratings from -54C to 538C, while the PTFE packing ratings range from -54C to 232C. With a 316 stainless steel construction, the FB series is available in a welded or gasketed valve body to bellows sealing. Stem tip configurations include a choice of blunt or regulating.