Watts LFM127-11 Installation, Operation And Maintenance Manual Download

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Standard Components

Operation

The One Way Flow Altitude Automatic Control Valve (ACV) with Delayed

Opening Feature is designed to open, allowing flow into a reservoir or

elevated storage tank (tank fill), and close drip tight when high water

level is achieved. The valve also has an adjustable delayed opening

feature, allowing a calculated “draw-down” of water level, before open-

ing for tank fill operation. The Altitude Pilot remotely senses static tank

head pressure (water level) through a field installed sensing line, and

P(L)

Y/FC

CLOSES VALVE

OPENS VALVE

FLOW

(Tank Sense Line)

1. Prior to installation, flush line to remove debris.
2. Install valve so the flow arrow matches flow through the line, and gauges to monitor valve inlet and outlet pressures. A Position Indicator

can be installed to provide visual indication of valve position and operation without disassembly.

3. Install 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 maintenance. Refer to valve servicing dimensions on next page. Avoid installing valves

6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are designed for horizontal in-line instal-

lation, with the cover facing up (main valve stem vertical). Slow operation or premature stem and guide wear may occur if valve is not

installed according to factory recommendations. Consult factory for detailed engineering review prior to ordering if valve is to be installed

other than horizontally in-line.

5. If valve is equipped with a pilot control system, extra precautions should be made during installation to protect the piping circuit from dam-

age. Only remove the pilot control system from the valve if necessary. Tubing and fittings should be kept clean and replaced exactly as

removed. Consult appropriate hydraulic schematic to ensure proper re-assembly.

6. Check to confirm that the sense line is installed and connected.
7. Installation of a pressure gauge on the sense line of the tank full-delayed opening system will assist in adjustment of setpoint. The amount

of pressure drop can be read at the time the main valve starts opening.

8. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.

Start-up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to adjustments

and the system to stabilize. The objective is to bring the valve into service in a controlled manner to protect the system from damaging over-

pressure.

directs pressure into and out of the cover chamber of the 3-way Accelerator Pilot. When the cover of the Accelerator Pilot is pressurized, the

main valve cover chamber is vented downstream (dry drain) or to atmosphere (wet drain), causing the valve to open fully. When the cover of the

Accelerator Pilot is de-pressurized, the main valve cover chamber is connected to upstream pressure, causing the valve to close drip tight.
As water level decreases, static tank head pressure falls below the adjustable setpoint of the Altitude Pilot, causing it to pressurize the cover of

the Accelerator Pilot, opening the valve. As water level increases, static tank head exceeds the adjustable setpoint of the Altitude Pilot, causing

it to depressurize the cover of the Accelerator Pilot, closing the valve drip tight. Valve opening and closing speeds are separately adjustable.

The Position Indicator with Air Bleed Petcock allows for visual indication of valve position, and easy venting of air entrapped in the main valve

cover chamber.
The adjustable Delayed Opening Feature “holds” high level static tank head pressure in the Altitude Pilot, causing the main valve to remain

closed as water level decreases. When static tank head pressure falls below the setpoint of the Delayed Opening Pilot, the Altitude Pilot com-

mands the main valve to open for tank fill operation. Reservoir filling can be “delayed” until water level falls 3-15 feet (adjustable) below desired

shut-off point to increase water circulation through the tank.

Specify Tank height PRIOR to ordering.

1 – Main Valve (M100 – Single Chamber)

2 – Delayed Opening Control

3 – Model 22-1 Accelerator Control

4 – Altitude Control

5 – Check Valve

6 – Adjustable Opening Speed

7 – Adjustable Closing Speed

8 – 3-Way Ball Valve