LINKAGE ADJUSTMENTS for 1004 and 1014 VALVES for air at 3 psi or less
FOR MOTORS WITH 160 TO 180 DEGREE TRAVEL
LOW RATE SETTING 1. Set control motor at low rate position.
When installing valves, support piping properly so there is no undue stress on the valves. Grease or other lubricants should not be applied to valve core or curtain, since dirt adhering to the lubricant increases friction. To adjust port area, set linkage for full valve travel. With valve handle at the wide open position, loosen screw (6) and retract the curtain fully (open) by turning knob (8) clockwise. Set burners for slightly more than maximum desired firing rate, using individual manual valves at the burners. Turn adjusting knob (8) counterclockwise until air pressure gauge shows a slight decrease, or until desired pressure is obtained. Tighten screw (6) into one of the holes in the adjusting knob (8) to prevent accidental shifting. Adjust linkage for low fire desired.
2. Loosen motor arm clamping bolt to free linkage so motor arm, linkage, and control handle can be moved. 3. Move valve control handle to desired low rate position as in- dicated by a downstream gauge, and mark the valve pointer position on the valve dial (position "L'' on Fig. 1). 4. Return valve control handle and entire linkage to closed position ("C'' on Fig. 1) as formerly, and tighten motor arm clamping bolt on motor shaft. 5. Loosen set screw in swivel block and adjust effective length of connecting rod to move control handle pointer to a position halfway between "C'' and "L''. Tighten set screw. 6. Lock connecting rod to motor arm in a position closer to motor shaft so control handle pointer is at "L''. Linkage is now set to give desired low rate valve position when motor is at low rate position. These adjustments will not alter any previous high rate setting. HIGH RATE SETTING 1. Set control motor at high rate position. 2. Loosen motor arm clamping bolt to free linkage so motor arm, linkage, and control handle can be moved. 3. Move valve control handle to desired high rate position as in- dicated by downstream gauge, and mark the valve pointer on the valve dial (position "H'' on Fig. 1). If desired high rate is maximum available flow and a but- terfly type valve is used, more sensitive control will be at- tained if "H'' is set where the first perceptible drop is noticed in the gauge reading when closing the valve. 4. Return valve control handle and entire linkage to open position ("O'' on drawing) as formerly, and tighten motor arm clamping bolt on motor shaft. 5. Loosen set screw in swivel block and adjust effective length of connecting rod to move control handle pointer to a position halfway between "O'' and "H''. Tighten set screw. 6. Lock connecting rod to motor arm in a position closer to the motor shaft so control handle pointer is at "H''. Linkage is now set to give desired high rate valve position when motor is at high rate position. These adjustments will not alter any previous low rate setting.
Valve internals can be cleaned or replaced without removing the valve from the pipe line.
The following table shows the number of turns required for adjusting the curtain height from full open to fully closed.
1004 and 1014 Valves
Valve
Number of Turns from Full Open to Fully Closed
size
B C D
27 32 48 48 72 36
E F
G*
* only available for 1004
Motor Arm
Connecting Rod
Motor Arm Clamping Bolt
Set Screw
Valve Control Handle
Instructions 1020 Page 3
Figure 1.
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