Seat High Temperature RTFE, double seal 5. F Minimum 6. F Minimum 7. WOG Rating 400 psig Minimum 8. For special applications, obtain approval of Planning, Design and Construction .
Valves are to close clockwise.
For special applications, obtain approval of Planning, Design and Construction . This is defined to mean that the seat rating is not reduced when pressure is applied in either direction and the valve is capable of serving as a blank flange, when bolted to the end of a line from either side of the valve body and no mating flange is attached. The means of attaching the body to the pipe flange, and of attaching the seat ring to the body shall meet the ANSI class rating of the valve without mechanical failure. This requirement normally results in partially lugged butterfly valves being not acceptable. Packing shall be able to be tightened without removing the insulation.