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Valve Disassembly Instructions

 

Before undertaking valve disassembly, it is recommended to gather the following tools to aid you during the process:
• Small & large adjustable wrenches
• Screwdriver set
• Machinist fine metal file
• Fine wire brush
• Bench vise
• Basic valve IO&M manual
• Hammer & dull cold chisel
• Heavy-duty ratchet & socket set
• Hexagonal wrench set
• 320 grit/fine Emery cloth
•  Appropriate technical bulletins for  

valve start-up procedures.

1.  Isolate the valve from line pressure and depressurize it to ensure safe working conditions. Disconnect any electrical  

connections if so equipped.

2.  Carefully remove Position Indicator or Limit Switches if equipped. Remove all tubing, fittings, and Control Pilots  

necessary to easily access and remove the cover. Remove cover nuts and washers.  

3.  Remove the cover. If cover is not free to be removed, loosen it by tapping upward along its outside edge with a dull cold chisel, pic-

tured above.  

a.  Large valves may require the installation of lifting “eye” bolts in order to facilitate cover removal; installation ports are provided on 

the cover for this purpose.

4.  Remove the Disc and Diaphragm Assembly from the valve body by lifting straight up. 

a.  Large diameter valves may require a lifting “eye” bolt to be installed in the valve stem accessory threads located on the very  

top of the valve stem.

5.  Before removing Stem Nut, examine stem threads for mineral build-up. Remove deposits with a fine wire brush. Extreme care should 

be taken not to damage the finish on stem guiding surfaces when disassembling. Avoid applying pipe wrenches to top or bottom 

stem guide surfaces.

VALVE COVER

BRASS BAR STOCK
(ANGLE UPWARD)

HAMMER

8          IOM-ACV-116-31_6116-31 2115 

EDP# 1917047 

© 2021 Watts

Содержание LFM116-31

Страница 1: ...Setting the Pressure Controls 3 Maintenance Schedule 6 Trouble Shooting Guide 6 Valve Disassembly Instructions 8 ACV Schematic 11 Local building or plumbing codes may require modifica tions to the information provided You are required to consult the local building and plumbing codes prior to installation If the information provided here is not consistent with local building or plumbing codes the l...

Страница 2: ... the upstream zone The valve will close if necessary until upstream pressure is above the pilot setting The valve should be specified to include the optional opening speed control and position indicator when used for Pressure Sustaining applications 1 X X X Y FC 3 AOS 1 2 P L 4 CLOSES VALVE OPENS VALVE FLOW 1 Clear the line free of slag and other debris 2 Install the valve so that the FLOW ARROW m...

Страница 3: ...eed air by loosening a fitting on the valve or a plug at the highest point of the valve as sembly STEP 5 Pressure the line by opening the upstream isolation valve slowly Air is vented through the air bleed valve or loosened fitting Tighten the fitting when liquid begins to vent See Figure 1 Repeat the process until no air is trapped in the system STEP 6 Actuate the solenoid to open the main valve ...

Страница 4: ...n valve until the inlet pressure drops to the desired setting Fine tune the Reducing Control adjustment to the pressure reduc ing setpoint as detailed in Step 7 STEP 10 Adjust the Sustaining Control screw IN clockwise until the inlet pressure begins to increase or OUT counterclockwise to de crease stopping at the desired pressure See Figure 2 4 IOM ACV 116 31_6116 31 2115 EDP 1917047 2021 Watts Fi...

Страница 5: ...T counterclockwise increasing the rate of closing IF INSTALLED Opening Speed Flow Control Adjustment The Opening speed flow control allows free flow into the cover and re stricted flow out of the cover of the main valve If recovery of pres sure is slow upon increased downstream demand turn the adjust ment screw OUT counterclockwise increasing the rate of open ing IF recovery of downstream pressure...

Страница 6: ... specification sheets for approximate cover capacity A continuous flow of water from the open port indicates a damaged diaphragm or loose disc diaphragm assembly Disassemble valve and replace diaphragm or tighten disc diaphragm assembly Test 2 Seat Seal Test 1 Close downstream isolation valve and install pressure gauges on an open inlet and outlet port of main valve 2 Open upstream isolation valve...

Страница 7: ... Adjust opening speed control to verify functionality adjust as required Standard setting for open ing speed control is 1 1 2 2 1 2 turns open from full closed position Can be adjusted in field Main Valve will not close Closed isolation valves in pilot system Check isolation valves ensure open Diaphragm is damaged Conduct diaphragm seal test repair and replace if necessary Main valve stem assembly...

Страница 8: ...Remove cover nuts and washers 3 Remove the cover If cover is not free to be removed loosen it by tapping upward along its outside edge with a dull cold chisel pic tured above a Large valves may require the installation of lifting eye bolts in order to facilitate cover removal installation ports are provided on the cover for this purpose 4 Remove the Disc and Diaphragm Assembly from the valve body ...

Страница 9: ...brush or by using a Mineral Dissolving Solution Inspect parts for wear and replace if necessary 7 Inspect valve seat If seat is not damaged removal is not necessary Valve seats 6 and smaller are threaded into the body of the valve and require a seat removal tool Figure 4 Table 1 details the tool dimensions for seat removal Valve seats 8 and larger are held in the valve body with stainless steel ca...

Страница 10: ...Nuts in a crossing pattern to ensure even distribution Test the Disc and Diaphragm Assembly for smooth travel by following the Freedom of Movement Test procedure in previous section 11 Test the integrity of the Seat Seal by following the Seat Seal Test procedure in previous section 12 Return valve to service by following instructions on the Technical Bulletin matching the valve function Size in 11...

Страница 11: ...eel 9 Stem Washer ASTM A276 304 Stainless Steel 10 Diaphragm Washer ASTM A536 65 45 12 Epoxy Coated Ductile Iron 11 Diaphragm Buna N Nitrile 12 Disc Retainer ASTM A536 65 45 12 Epoxy Coated Ductile Iron 13 Seat Disc Buna N Nitrile 14 Spacer Washer x5 NY300 Fiber 15 Disc Guide ASTM A743 CF8M 316 Stainless Steel 16 Shaft ASTM A276 304 Stainless Steel 17 Seat Ring ASTM A743 CF8M 316 Stainless Steel 1...

Страница 12: ...not be responsible for any incidental special or consequential damages including without limitation lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly other costs resulting from labor charges delays vandalism negligence fouling caused by foreign material damage from adverse water conditions chemical or any other circumstances o...

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