ITT Skotch Trifecta T4405F Installation, Operation And Maintenance Instructions Download Page 2

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Technical Manual No. IOT4400F

Effective 8/31/2018

REV LEVEL B

Record of Revisions

Revision

Description

Date

First

Issue

6/17/99

Supply pressure changed to 70 psi minimum. Added
T4407 model

5/15/2013

Revised format and text. Added suffix F to model
number

08/31/18

Summary of Contents for Skotch Trifecta T4405F

Page 1: ...ents of various materials and they should be used only in services recommended herein or by a company valve engineer Misapplication of the product may result in injuries or property damage A selection...

Page 2: ...ective 8 31 2018 REV LEVEL B Record of Revisions Revision Description Date First Issue 6 17 99 A Supply pressure changed to 70 psi minimum Added T4407 model 5 15 2013 B Revised format and text Added s...

Page 3: ...ION PAGE I Description 5 II Operation 6 III Installation 9 IV Commissioning 11 V Disassembly Maintenance Instructions 11 VI Leak Testing 19 VII Switch Testing 20 VIII Miscellaneous Instructions for Sp...

Page 4: ...essories Assembly Model T4400F Gas Burner Valve System 60 021 Electrical Schematic Fail in Last 60 022 Electrical Schematic Fail Closed 60 018 Wiring Diagram AC Solenoids 60 024 Wiring Diagram DC Sole...

Page 5: ...pneumatic operation and requires compressed air and electric power to open and close The system fails in last position on loss of air or electric power It will not hold this position indefinitely if a...

Page 6: ...pply line voltage across terminal points 1 and 2 for AC solenoids Terminal points 18 and 19 for DC Solenoids located in the junction box This energizes the pilot solenoid allowing pneumatic pressure i...

Page 7: ...linder both inlet and outlet return springs move their respective plugs toward their seat rings First the inlet valve soft seal makes halting flow through the assembly then its metal back up The inlet...

Page 8: ...utlet valves to individually monitor the status of each block valve The outlet valve POC is located on the top or actuator side and the inlet valve POC is located on the bottom of the valve assembly L...

Page 9: ...lifting safety precautions for transporting the valve Purge the fuel line prior to installing the valve Purge all pneumatic air lines prior to connecting solenoids CAUTION Note Do not lift or pull on...

Page 10: ...ial precaution to insure weld heat does not damage valve seals and gaskets Temperatures in these areas should be kept below 200 F CAUTION Vent pipe size should be equivalent to the vent fitting size s...

Page 11: ...tested to confirm integrity The T4400F Systems are equipped with a 1 4 NPT test port in the protruding end of the outlet valve shaft See drawing 117923 This port is directly connected to the valve s...

Page 12: ...tools include ITT P N 49088 Spring Compressor T4300F T4400F Uses to compress the outlet return spring during disassembly and assembly ITT P N 49111 Tool Seat Ring Puller T4400F Use to remove seat ring...

Page 13: ...Piston Nut Item 19 from Outlet Valve Subassembly Places the Spring Compressor P N 49088 on Piston Item 21 and secure tie rods to valve body Wrench tight the tie rods in uniform increment to compress...

Page 14: ...Item 56 from the Flange Studs Item 55 remove the nuts from the long end of the exposed threads Removing them from the short end will not properly unload the spring Remove the Inlet Valve Return Spring...

Page 15: ...cket Subassembly by unscrewing Mounting Screws Item 31 there are retaining Loctite on the threads of the screws Remove Spring Bucket Gasket Item 32 and clean the surfaces of sealant Remove Vent Shaft...

Page 16: ...ubassembly Stack the three separate Vent Wave Springs Item 82 on top of one another in a nested fashion Ensuring the lap joint of the wave springs is staggered Slide the wave springs Item 82 and sprin...

Page 17: ...y from bottom of valve body Item 2 Care not to damage Outlet Valve Subassembly and it should be supported Apply gasket compound to the gasket side of Inlet Seat Ring Item 44 Press on the Seat Ring Gas...

Page 18: ...of the gasket Slide Outlet Return Spring Item 28 over the Outlet Valve Subassembly and on the Spring Bucket Subassembly Slide Piston Item 21 over Outlet Valve Subassembly onto Outlet Return Spring Ite...

Page 19: ...ssary to leak test each block valve and the vent valve individually to properly qualify the status of each seal The valves are named in accordance to their position and function within the valve syste...

Page 20: ...The Skotch Trifecta Gas valve consist of two block valves with a corresponding proof of closure switch that must be tested individually The POC switches should be tested after the valve has been leak...

Page 21: ...y resting on the inlet valve shaft and the normally closed contacts should be made f Stroke the valve to the open position Allow the valve to close slowly while monitoring the flow rate from the outle...

Page 22: ...in the closed position b Loosen the two screws that hold the POC switch to the L shaped bracket c While monitoring the normally open contacts move the switch downward towards the actuator top cap unti...

Page 23: ...valve is at or near full open or 70 of inlet valve stroke c Slowly close the valve making certain the switch resets prior to the inlet valve POC switch tripping 2 Setting a The switch setting is adju...

Page 24: ...be advised that spare parts should be ordered directly from ITT Engineered Valves as such materials are specially designed for Skotch Trifecta Valve Systems Other replacement parts although they may...

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