Spec Sheet
Working Principle: Float Type Auto Drain
N.C. type: AD37, AD47N.O. type: AD38, AD48
Compact auto drain
N.C. type: AD17, AD27
Bowl
Valve
Lever
Float
Valve seat
Chamber
Piston
Spring
Housing
DrainDrain
Seal
Drain cock
q
r
e
w
t
i
u
y
o
!0
!1
Bowl
Valve
Lever
Float
Valve seat
Chamber
Piston
Spring
Housing
Seal
Drain cock
q
r
e
w
t
i
y
u
o
!0
!1
Drain
Bowl
Float
Lever
Valve
Valve seat
Knob
q
w
e
r
t
y
• When pressure inside the bowl is re-
leased:
Even when pressure inside the bowl q is re-
leased, spring y keeps piston u in its upward
position.
This keeps the seal created by the seal !0 in
place; thus, the inside of the bowl q is shut off
from the outside air.
Therefore, even if there is an accumulation of
condensate in the bowl q, it will not drain out.
• When pressure is applied inside the
bowl:
Even when pressure is applied inside the bowl
q, the combined force of spring y and the
pressure inside the bowl q keeps piston u in
its upward position.
This maintains the seal created by the seal !0
in place; thus, the inside of the bowl q is shut
off from the outside air.
If there is no accumulation of condensate in the
bowl q at this time float w will be pulled down
by its own weight, causing valve r, which is
connected to lever e, to seal valve seat t.
• When there is an accumulation of
condensate in the bowl:
Float w rises due to its own buoyancy and
pushes open the seal created by the valve seat
t. Pressure passes from the bowl q to cham-
ber i.
The result is that the pressure inside chamber
i surpasses the force of the spring y and
pushes piston u downwards.
This causes the sealing action of seal !0 to be
interrupted and the accumulated condensate in
the bowl q drains out through the drain cock !1.
Turning drain cock !1 manually counterclock-
wise lowers piston u, which pushes open the
seal created by seal !0, thus allowing the con-
densate to drain out.
• When pressure inside the bowl is
released:
When pressure is released from the bowl q,
piston u is lowered by spring y.
The sealing action of seal !0 is interrupted, and
the outside air flows inside the bowl q through
housing hole o and drain cock !1.
Therefore, if there is an accumulation of con-
densate in the bowl q, it will drain out through
the drain cock.
• When pressure is applied inside the
bowl:
When pressure exceeds 0.1 MPa, the force of
piston u surpasses the force of spring y, and
the piston goes up.
This pushes seal !0 up so that it creates a seal,
and the inside of the bowl q, is shut off from
the outside air.
If there is no accumulation of condensate in the
bowl q at this time, float w will be pulled down
by its own weight, causing valve r, which is
connected to lever e, to seal valve seat t.
• When there is an accumulation of
condensate in the bowl:
Float w rises due to its own buoyancy and
pushes open the seal created by the valve seat
t.
This allows the pressure inside the bowl q to
enter the chamber i. The result is that the
combined pressure inside chamber i and the
force of the spring y lowers the piston u.
This causes the sealing action of seal !0 to be
interrupted, and the accumulated condensate in
the bowl q drains out through the drain cock !1.
Turning drain cock !1 manually counterclock-
wise lowers piston u, which pushes open the
seal created by seal !0, thus allowing the con-
densate to drain out.
• When pressure inside the bowl is
released:
Even when pressure inside the bowl q is
released, the weight of the float w causes
valve r, which is connected to lever e, to seal
valve seat t. As a result, the inside of the bowl
q is shut off from the outside air.
Therefore, even if there is an accumulation of
condensate in the bowl q, it will not drain out.
• When pressure is applied inside the
bowl:
Even when pressure is applied inside the bowl
q, the weight of the float w and the differential
pressure that is applied to valve r cause valve
r to seal valve seat t, and the outside air is
shut off from the inside of the bowl q.
• When the drain is accumulated in
the bowl:
Float w rises due to its own buoyancy and the
seal at valve seat t is interrupted.
The condensate inside the bowl q drains out
through the knob y.
Turning knob y manually counterclockwise
lowers it and causes the sealing action of valve
seat t to be interrupted, which allows the
condensate to drain out.
331
Air Filter
Series AF10 to AF60
AC
AF
AR
AL
AW
AG
AV
AF800
AF900