CKD HD-0.5, Instruction Manual, Page: 6 / 23

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Equipped with unique valve mechanism, CKD Heatless Dryers are simple in structure
and have excellent drying efficiency.
In the left-hand-side figure, solenoid valve (F) is
closed while valve (D) is open. The wet compressed
air from inlet passes through desiccant tube (A) and
gets dried. Most of this dry air flows out to outlet,
while a small quantity passes through orifice (B) for
pressure reduction before flowing into desiccant
tube (C). Here, the wet desiccant is removed of
moisture before passing through solenoid valve (D)
and finally being discharged to the atmosphere.
(Regenerative purging)
In the left-hand-side figure, the timer keeps both
of the solenoid valve (D) and (F) closed during the
stationary stage. Here, the air from desiccant tube
(A) flows into desiccant tube (C) through orifice
(B) , virtually balancing the pressures in (A) and
(C).
The solenoid valve (F) is opened by the timer, but
since (D) remains closed, the pressure in desiccant
tube (A) drops immediately, causing ball checks (E)
and (G) to make a quick shift rightward.
This closes tube (A), and turns the main current of
compressed air to tube (C), where the air is dried.
A part of the compressed air passes through orifice
(H) for pressure reduction before flowing into tube
(A), where the desiccant is removed of moisture
before being discharged to the atmosphere through
solenoid valve (F). (Regenerative purging)
２．DESCRIPTION OF FUNCTION