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ITT Skotch Trifecta T4405F Installation, Operation And Maintenance Instructions

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ITT Engineered Valves, LLC
33 C
R
ENTERVILLE
OAD
L
, PA 17603-2064
ANCASTER
T
: (717) 509-2200
EL
F
: (717) 509-2355
AX
www.engvalves.com
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MODEL T4405F & T4406F & T4407F
Skotch
Trifecta
VALVE SYSTEM
WARNING
Valves and valve actuators supplied by ITT Engineered Valves, LLC are designed and
manufactured using good workmanship and materials, and they meet the applicable industry
standards. These valves are available with components 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 of valve components of the
proper material and consistent with the particular performance requirement is important for
proper application.
Examples of misapplication or misuse of products includes use in an application in which the
pressure/temperature is exceeded or failure to maintain the equipment as recommended and use
of products to handle caustic and/or hazardous substance when not design for that purpose.
If valve exhibits any indication of leakage, do not operate. Isolate valve and either repair or
replace.
Technical Manual No. IOT4400F
Effective 8/31/2018
REV LEVEL B

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Summary of Contents for ITT Skotch Trifecta T4405F

  • Page 1 VALVE SYSTEM WARNING Valves and valve actuators supplied by ITT Engineered Valves, LLC are designed and manufactured using good workmanship and materials, and they meet the applicable industry standards. These valves are available with components of various materials, and they should be used only in services recommended herein or by a company valve engineer.
  • Page 2 Record of Revisions Revision Description Date First Issue 6/17/99 Supply pressure changed to 70 psi minimum. Added 5/15/2013 T4407 model Revised format and text. Added suffix F to model 08/31/18 number Technical Manual No. IOT4400F Effective 8/31/2018 REV LEVEL B...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION PAGE Description .................. Operation ..................III. Installation .................. Commissioning ................Disassembly & Maintenance Instructions ........Leak Testing ................VII. Switch Testing ................VIII. Miscellaneous Instructions for Special Options ......Spare Parts Ordering Information ..........Reference Information ............... Technical Manual No.
  • Page 4 DRAWINGS 117923 Valve Assembly - Model T4400F Systems 117924 Accessories 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 Solenoids 116763 Wiring Diagram - GO Prox Switches 117473...

  • Page 5: Description

    Engineered Valves, LLC Page 5 of 24 DESCRIPTION The Model T4400F Trifecta Burner Valve System provides all the isolation and venting functions necessary for automated operation of gas-fired burners in utility and industrial power plants. These include double block of the main gas line and venting the chamber between blocks to atmosphere.

  • Page 6: Operation

    Engineered Valves, LLC Page 6 of 24 OPERATION Refer to solenoid assembly nameplate or purchase order specifications to determine appropriate line voltage and type. Operation is in accordance with referenced drawings. Check specific order options and wiring diagrams (60-018 for AC voltage or 60-024 for DC voltage) for electrical terminals supplied inside the junction box.
  • Page 7 Engineered Valves, LLC Page 7 of 24 Close Block Valves (Open Vent) How the valve is commanded Closed differs between different model numbers. For T4405F valves: Deleting voltage from terminal 1 and 2, and applying voltage momentarily across terminals 2 and 3 for AC Solenoids (Terminals 20 and 21 for DC solenoids) energizes the exhaust coil and exhausts pneumatic pressure from the cylinder.
  • Page 8 Engineered Valves, LLC Page 8 of 24 For Model T4405F valves, the solenoid pilot valve is a dual coil momentary contact type, rated for continuous duty at the service voltage. Note: Never energize both solenoid coils simultaneously. Doing so, will permanently damage the solenoid valve.

  • Page 9: Installation

    Engineered Valves, LLC Page 9 of 24 III. INSTALLATION Unpacking Do not remove protective plastic plugs until ready to install. Verify no debris or foreign objects are inside the valve. Transporting - use proper hoisting procedures to avoid damage to valve. If using a sling, it should be placed on the body, not the actuator cylinder.
  • Page 10 Engineered Valves, LLC Page 10 of 24 The T4400F Trifecta Valve System is typically supplied with a female NPT vent connection and flanged end connections. (Note: Other end configurations available upon request.) Refer to order specification or purchase order specifications for type supplied. Valve installation should be in accordance with standard practices for end connection provided.

  • Page 11: Commissioning

    Engineered Valves, LLC Page 11 of 24 CAUTION Failure to maintain proper pneumatic air line pressure could result in damage to the valve. Use suitable thread sealing compound only. Do not use PTFE tape. CAUTION The exhaust side of the solenoid should not be restricted. This will slow the closing rate of the valve.
  • Page 12 Special 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 rings from valve body. Disassembly WARNING Individual valve components can be very heavy and difficult to remove.
  • Page 13 Engineered Valves, LLC Page 13 of 24 Continue as follows (Reference drawings 117923 and 117924): Unscrew Hex Nuts (Item 13) from Tie Rods (Item 12) and remove Rods. Remove Junction Box Bracket (Item 122) and Slide off Actuator Top Cap (Item5).
  • Page 14 Engineered Valves, LLC Page 14 of 24 Discard old Piston Gasket (Item 24) and clean surfaces of sealant. Remove Piston Seals (Item 22) and Piston Bearing Strip (Item 23). Remove Outlet Valve Return Spring (Item 28). Unscrew Hex Nuts (Item 56) from the Flange Studs (Item 55) taking note of the Warning below and slip the Bottom Flange (Item 70) out of Body Subassembly (Item 2).
  • Page 15 Engineered Valves, LLC Page 15 of 24 Unscrew seal retainer screws (Item 80) and remove Seal (Item 78) and Retainer (Item 79) from Inlet Valve Subassembly. There are retaining Loctite on the treads of the screws. Remove Inlet Valve Seat Ring Retaining Screw (Item 45); there are retaining Loctite on the threads of the screws.
  • Page 16 Engineered Valves, LLC Page 16 of 24 Upon disassembly, all sealing and bearing surfaces, including metal back-up seats, should be inspected for nicks or other surface finish damage. Damaged items should be replaced. Prior to reassembly, scrape any remaining gasket material from mating surfaces.
  • Page 17 Engineered Valves, LLC Page 17 of 24 Actuator Shaft Bushing Lubricate O-Ring (Item 10), Shaft Wiper (Item 6) and Shaft Seal (Item 7) with a suitable lubricant, such as, Dow Corning 55. Install O-Ring (Item 10) in Actuator Top Cap (Item 5). Install Shaft Wiper (Item 6) and Shaft Seal (Item 7) in Bushing (Item 8).
  • Page 18 Engineered Valves, LLC Page 18 of 24 bearing Holder (Item 71) of Bottom Flange Subassembly. Tighten the flange nuts in a crisscross pattern until snug; making certain flange is not cocked. Torque the nuts to 200 ft-lbs in crisscross pattern and recheck. Apply gasket compound to the gasket side of Spring Bucket Subassembly.

  • Page 19: Leak Testing

    Engineered Valves, LLC Page 19 of 24 Initially tighten the flange nuts in a crisscross pattern until snug. Final torque the nuts to 200 ft-lb in a crisscross pattern and recheck. Lubricate the solenoid mounting O-Ring with a suitable o-ring lubricant and place on the actuator top cap.

  • Page 20: Switch Testing

    Engineered Valves, LLC Page 20 of 24 Vent Valve Verify the valve is in the full open position. Seal the outlet side of the valve. Pressurize the inlet with a maximum of 50 psig clean dry air, while monitoring the leak rate from the vent or test port. FM specifies a leak rate of 24 in /hr (400 cc/hr) or less.
  • Page 21 Engineered Valves, LLC Page 21 of 24 Loosen the roller switch lever. Place a 1/8" shim between the inlet valve shaft and roller switch lever. While holding the roller firmly against the shim and shaft, rotate the switch actuator shaft until the normally closed contacts of the switch break.
  • Page 22 Engineered Valves, LLC Page 22 of 24 Outlet Valve POC Switch Testing Remove the outlet valve switch cover. With the valve in the closed position, verify the normally open contacts are made. Very slowly open the valve until the normally open contacts are open.

  • Page 23: Viii. Miscellaneous Instructions For Special Options

    Engineered Valves, LLC Page 23 of 24 made, then the switch will have to be adjusted upward. If an adjustment is necessary, repeat procedure starting at section VII.B.2.d Open Limit Switch (If equipped) Testing Verify the valve is in the closed position. Slowly open the valve paying particular attention to when the open limit switch contacts change state (trip).

  • Page 24: Spare Parts Ordering Information

    Phone: 717-509-2200 Fax: 800-348-9000 Please 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 be similar in function, will void the FM rating.

This manual is also suitable for:

Skotch trifecta t4406fSkotch trifectat4407f

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