Drain-All Model 1700-IG Installatiehandleiding - Pagina 5

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Drain-All Model 1700-IG Installatiehandleiding

FIGURE 1: START OF CYCLE

The float (1) with a magnet molded in (2)

is sitting on the base and is at the lowest

level. The float magnet exerts a magnetic

force repelling the center tube magnet (3)

upward, holding it seated against an ori-

fice in the lower end of the valve stem

(4). This retains the control air coming in

through the control air filter (5) in the

center tube (6). The control air circuit

including the center tube magnet and

valve stem are isolated from the liquid

held in the reservoir (7). The air cylinder

(8) is in the home position and the dis-

charge ball valve (9) is closed.

There is always a residual amount of liq-

uid (10) left in the bottom of the reservoir

after each discharge cycle. The Model

1700

stops discharging before all accu-

mulated liquid is removed providing a

liquid seal that conserves expensive com-

pressed air. Liquid (11) flows through the

inlet port (12) and into the reservoir to

start the fill cycle. Liquid continues to fill

the reservoir until the float has displaced

enough liquid to become buoyant and the

float pops upward to the upper position

shown in Figure 2.

022802 Model 1700-IG

PRODUCT TECHNOLOGY

HOW IT WORKS

FIGURE 2: START OF DISCHARGE

The liquid flows in and raises the float to

its highest position as shown. The float

magnet is raised up past the center tube

magnet and repels the center tube magnet

downward opening the orifice in the

valve stem. This allows the control air

held in the center tube to flow through the

control air circuit to the actuating cylin-

der. The actuating cylinder extends and

opens the ball valve starting the discharge

of accumulated liquid.

When the correct amount of liquid has

been discharged, leaving a liquid seal in

the reservoir, the float has been lowered

to a point where the float magnet is below

the center tube magnet. In this position,

the float magnet repels the center tube

magnet back upward against the valve

stem orifice, which seals off the control

air flow to the actuating cylinder. The

cylinder has a spring which then returns

the cylinder to its home position, closing

the discharge ball valve. The discharge is

stopped as shown in Figure 1 and the fill

cycle repeats.

Page 5

THE BALANCE LINE PORT

The balance line port is a hole through

the head of the Model 1700

into the reservoir. This port allows the air

trapped in the top of the reservoir to

move out of the reservoir to allow liquid

to enter the reservoir through the inlet

port. If there were no balance line port, as

liquid entered the reservoir under pres-

sure, the air trapped in the top of the

reservoir would be compressed until it

was the same pressure as the liquid com-

ing in and the unit would stop filling.

There are three methods of connecting to

the balance line port. The most effective

is to connect it back to the vessel being

drained as shown in the illustrations

above. In this configuration, the reservoir

is at the same pressure as the vessel being

drained and the liquid is filling by gravi-

ty. In this case, the top of the Model

1700

must be lower than the bottom of

the vessel being drained. The balance line

can also be attached to a header pipe

leaving the vessel being drained or vent-

ed to atmosphere using a needle valve.

Venting to atmosphere uses very little air

if the needle valve is adjusted properly.

that goes