AMES 682GD Manuale - Pagina 4

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STEP 6

Opening Speed Flow Control Adjustment: The Opening speed

needle valve restricts flow out of the cover of the main valve.

If the main valve is opening too slowly turn the adjustment screw

OUT, counterclockwise, increasing the rate of opening (See Figure

2B).

If the main valve is opening too quickly, turn the adjustment screw

IN, clockwise, decreasing the rate of opening (See Figure 2A).

Setting the Sustaining Control

STEP 7

Setting the Sustaining Control requires lowering the upstream

pressure to the desired minimum sustained pressure.

STEP 8

Leave the downstream isolation valve full open and close the

upstream isolation valve until the inlet pressure drops to the

desired setting.

STEP 9

Adjust the Sustaining Control screw IN, clockwise, until the inlet

pressure begins to increase (See Figure 3A), or OUT, counter-

clockwise, to decrease (See Figure 3B), stopping at the desired

pressure.

STEP 10

Allow pressure to stabilize.

STEP 11

Fine-tune the sustaining setting as required as detailed in STEP 8.

STEP 12

Open upstream isolation valve to return to normal operation.

STEP 12

De-energize solenoid to check that the main valve closes.

STEP 13

At valve closure booster pump will stop. Adjust limit switch collar

to final position to ensure positive actuation of limit switch elec-

trical contact, if necessary, by sliding up/down to location (See

Figure 4).

IOM-A-ACV-982_682 2115

Clockwise to DECREASE

rate of opening

Clockwise to increase inlet

pressure

PV20C — Pressure Sustaining Control

Limit Switch in Closed Position

EDP# 1917092

Counterclockwise to INCREASE

the rate of opening

Figure 2

Flow Control

Counterclockwise to decrease

inlet pressure

Figure 3

Figure 4