MANIFOLDS, VALVES, LINKAGES
5. Loosen setscrew in swivel block and adjust effective length of connecting rod to move control handle pointer to a position halfway between "C" and "L." Tighten setscrew. 6. Lock connecting rod to motor arm in a position closer to motor shaft so control handle pointer is at "L." 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 indicated by downstream gauge, and mark the valve pointer on the valve dial (position "H" on figure 1). 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 setscrew in swivel black and adjust effective length of connecting rod to move control handle pointer to a position halfway between "O" and "H." Tighten setscrew. 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. NOTES • If shortest effective motor arm radius does not give a short enough valve stroke, lengthen effective valve arm and repeat above steps. • If the swivel block projects so far that it presents a clearance problem at either end of the valve control handle, note valve handle position, loosen setscrew "B," slide connecting rod out of swivel, and rotate swivel as shown in Figure 2. Then return valve handle to noted position and tighten "B." In desired high rate is maximum available flow and a butterfly type valve is used, more sensitive control will be attained if "H" is set where the first perceptible drop is noticed in the gauge reading when closing the valve.
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