B75-1B20-KOF datasheet(3/8 Pages) MAGNETROL

3 / 8 page

42-686 Series K Pneumatic Switch Mechanism

1.0

Description

The Series K is a non-bleed pneumatic switch. It incorpo-

rates a three-way pneumatic valve assembly, actuated by a

magnet swing carriage. Mechanisms are available as an

option for most Magnetrol liquid level controls.

2.0

Technology

Magnetic force and the lever mechanism transmit move-

ment from the pressure vessel to the pneumatic valve.

Figure 1 shows the position of the attraction sleeve and

magnet when the liquid level is such that the attraction

sleeve is below the field of the magnet. In this position, the

flapper has been drawn away from the valve rod, permitting

the inlet air or gas to flow to a pneumatic operator. Inlet air

pressure against the ball allows the ball to seal off the

exhaust outlet.

Figure 2 shows the position of the attraction sleeve and the

magnet when the liquid level has risen, causing the attrac-

tion sleeve to attract the magnet against the enclosing tube.

In this position, the flapper actuates the air valve, closing

the supply inlet and opening the exhaust port, which

reduces the pressure in the operator to atmospheric. This

action, “close” on high, is reversible to “open” on high with

two simple adjustments (refer to page 4).

NOTE: In order to protect the switch assembly from contaminants,

filtered and dried gas/air supply is recommended.

Attraction sleeve

Non-magnetic

enclosing tube

Flapper

adjustment screw

Air supply

open position

Falling

level

Magnet (swing

out position)

Upper

shoulder

screw

Lower shoulder

screw

Pivot

Actuating link

Reverse link

position for

opposite action

To operator

Air valve

Exhaust

closed

Flapper

Pivot

Attraction sleeve

Non-magnetic

enclosing tube

Flapper

adjustment screw

Rising

level

Magnet (swing

in position)

Upper

shoulder

screw

Lower shoulder

screw

Pivot

Actuating link

Reverse link

position for

opposite action

Flapper

Pivot

Air supply

closed position

To operator

Air valve

Exhaust

open

Figure 1

Attraction sleeve below field of magnet

Figure 2

Attraction sleeve in field of magnet

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