background image

STEP 6

When the required level is reached, or if the tank is overflowing, 
SLOWLY turn the adjustment screw OUT, counterclockwise, in ¼ 
to ½ turn increments (See Figure 4). A small amount of water will 
discharge from the vent/exhaust line of the Altitude control, signal-
ing the port connection changes of both the Altitude Control and 
accelerator. The valve will start closing as indicated by the position 
indicator stem movement.

The following is dependent upon the installation/application and 
may not be required on all valves: When the valve is closed, the 
Altitude control screw adjustment may be turned OUT, counter-
clockwise, an additional ¼ to ½ turn (See Figure 4). This will lower 
the shut-off level slightly below the tank over-flow mark, eliminat-
ing any wave action discharge from the over-flow pipe. 

Setting the Altitude Pilot 

STEP 4

Slowly open the downstream isolation valve.

STEP 5

If the valve remains closed as indicated by the stem position in 
the position indicator (See Figure 2) and the tank level is known 
to be below the desired level, SLOWLY turn the adjustment screw 
IN, clockwise, by ¼ to ½ turn increments (See Figure 3).

This will cause the valve to start opening, filling the tank. 
Additional clockwise adjustment may be necessary to raise the 
level to the overflow line.

4          IOM-A-ACV-960-13-17_660-13-17   2115 

EDP# 1917068 

© 2021 Watts

IOM-A-ACV-960-13-17_660-13-17   2115 

EDP# 1917068 

© 2021 Watts         5

Clockwise to INCREASE 

minimum tank level set 

point.

Figure 3 

Model 27 - Altitude Pilot

Counterclockwise to DECREASE 

minimum tank level set point.

Figure 4 

Model 27 - Altitude Pilot

Figure 2 

Position Indicator Stem in Down Position 

Indicating Valve Closed

Summary of Contents for 660GD-13-17

Page 1: ...g the Altitude 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 informati...

Page 2: ...tall isolation valves upstream and downstream of the main valve Note If using butterfly valves ensure valve disc does not contact the main valve 4 Provide adequate clearance for valve servicing and ma...

Page 3: ...air will need to be bled off the valve cover during startup The ACV includes a bleed valve use a flat head screwdriver to slowly open the valve See Figure 1 STEP 3 Pressure the line by opening the ups...

Page 4: ...slightly below the tank over flow mark eliminat ing any wave action discharge from the over flow pipe Setting the Altitude Pilot STEP 4 Slowly open the downstream isolation valve STEP 5 If the valve...

Page 5: ...g the adjustment screw IN clockwise to increase or OUT counter clockwise to decrease opening delay See Figure 5B 5A 5B IOM A ACV 960 13 17_660 13 17 2115 EDP 1917068 2021 Watts 5 Counterclockwise to D...

Page 6: ...cification 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...

Page 7: ...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 diaphrag...

Page 8: ...e 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...

Page 9: ...h 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...

Page 10: ...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 o...

Page 11: ...Steel 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...

Page 12: ...sulting from labor charges delays vandalism negligence fouling caused by foreign material damage from adverse water conditions chemical or any other circumstances over which the Company has no control...

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