PRODUCT OPERATION

is connected to position cylinder. E port is Connected to either volume tank or blanked depending upon the requirement of specific valve position. The supply pressure connected to 'SIG' port loads upper diaphragm subassembly resulting in closing of exhaust port and opening air path for actuation of piston. The downward movement of piston actuates both valve sub assemblies causing isolation of port 'E' and connection of port 'S and 'U'. When the supply pressure drops below the trip point, the exhaust port opens, verting the air actuating the piston. The Piston Moves upward causing isolation of port 'S" and connecting of ports 'E' and 'U'. by changing connection of volume tank to either of 'E' ports fail open or close position and by blanking of both the 'E' ports fail lock position can be set. The Trip valve has its ports marked S, U, E and SIG positioner output is connected to S port and u port connected to position cylinder. E port is Connected to either volume tank or blanked depending upon the requirement of specific valve position. The supply pressure connected to 'SIG' port loads upper diaphragm subassembly resulting in closing of exhaust port and opening air path for actuation of piston. The downward movement of piston actuates both valve sub assemblies causing isolation of port 'E' and connection of port 'S' and 'U'. When the supply pressure drops below the trip point, the exhaust port opens, verting the air actuating the piston. The Piston Moves upward causing isolation of port 'S" and connecting of ports 'E' and 'U'. by changing connection of volume tank to either of 'E ports fail open or close position and by blanking of both the 'E' ports fail lock position can be set.