... or Double-acting pneumatic actuatorsAvailable Accessories solenoid valve,air filter,lock up valve,switch,Valve position transmitter,Emergency action equipments,hand wheel ... 304,304L,316,316L,corrosion-resisting alloy…lSphere/seat material:PTFE,A105,1Cr13, 304,304L,316,316L,corrosion-resisting alloy… ... alloy spray welding,Spray welding tungsten carbide;lFilling materials: PTFE, flexible graphite.