Ametek Magnetrol Tuffy Manuel d'installation et d'utilisation - Page 5
Parcourez en ligne ou téléchargez le pdf Manuel d'installation et d'utilisation pour {nom_de_la_catégorie} Ametek Magnetrol Tuffy. Ametek Magnetrol Tuffy 8 pages. Liquid level controls with pneumatic switch
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2-Way
2-Way
3-Way
Port
N.O.
N.C.
N.O.
(direct) (reverse) (direct) (reverse)
A
Inlet
Plug
Inlet
B
Plug
Inlet
Exhaust
C
Outlet
Outlet
Outlet
N.O.—Direct acting: Air supply on switch condition.
N.C.—Reverse acting: Air cut-off on switch condition.
Figure 3
Air inlet (B)
(no air flow)
Air inlet (A)
Spring
Valve
plunger
Air outlet (C)
Valve body
Figure 4
Low Level Operation—Direct Acting
Air inlet (B)
Air inlet (A)
(no air flow)
Spring
Valve
plunger
Air outlet (C)
Valve body
Figure 5
High Level Operation—Direct Acting
Tuffy Liquid Level Control with Pneumatic Switch
1.4
3-Way
N.C.
Diverter Selector
Exhaust
Outlet
Outlet
Inlet
Outlet
Inlet
Outlet
Inlet
Outlet
2.0
2.1
Tuffy body
Magnet
(Non-magnetic)
pivot
Magnet
Pivot
Float
Falling level
Pivot arm
2.2
Tuffy body
Magnet
(Non-magnetic)
pivot
Rising level
Magnets
Float
Pivot
Pivot arm
irline Connections
1. Inlet air should be filtered with a 5 micron or finer filter.
This will extend the life of the valve mechanism.
2. Connect the inlet air line to the
either air inlet A or air inlet B, depending on the valve
action desired (refer to Figure 3). Inlet air pressure should
be between 0–200 psig. Refer to Figure 1 for location of air
inlets.
3. Connect outlet air line to the
bottom of the valve. This air outlet is designated with a
"C". Refer to Figure 1 for location.
4. If 3-way function is used, attach the exhaust air line to the
appropriate
⁄
" NPT connection based on valve action
1
4
described in Figure 3.
Reference Information
Description
Tuffy liquid level switches are designed for horizontal
mounting in a tank or vessel through threaded or flanged
pipe connections. Standard models are equipped with a
three-port/two-position valve actuated by a magnetically
actuated pivoted cam mechanism. This instruction manual
covers Tuffy level controls which have pneumatic switches.
For Tuffy controls with electric switches, please consult
Bulletin 44-607.
Theory of Operation
At a "low operating level" of liquid in a tank or vessel (refer
to Figure 4), the float moves the magnet upward and into
the field of the switch mechanism magnet. As a result, the
magnets repel causing the pivot arm and valve plunger to
move so that air is allowed to pass from air inlet A to air
outlet C. As liquid level rises, the float moves the magnet
downward until the switch mechanism magnet reverses
position, allowing the valve plunger to move so that air is
allowed to pass from air inlet B to air outlet C (refer to
Figure 5).
For direct acting low level operation, air inlet A is closed off
when liquid level increases. Conversely, for high level opera-
tion, air inlet B is closed off when liquid level recedes.
For reverse acting operation, air inlet A is used for high level
and air inlet B is used for low level. Plug the air inlet that is
not in use to prevent foreign materials from entering.
1
⁄
" NPT connection for
4
⁄
" NPT connection on the
1
4
5