Danfoss ICS1-65+CVP,ICS3-100-150DIN Pilot-operated servo valves

Danfoss ICS1-65+CVP,ICS3-100-150DIN Pilot-operated servo valves Design

ICS valves are designed as pilot operated valves
requiring minimal pressure differential to open.
If the pressure difference is 0 bar/0 psi, the ICS
valve will be closed. If the pressure difference is
0.2 bar/3 psi or more, the ICS valve will be fully
open. At pressure differences between 0.07 bar/1
psi and 0.2 bar /3 psi, the opening degree will be
correspondingly proportional.
The ICS is available for use with either one or
three pilot valves.
Two of the three pilot pressure connections (S1
and S2) are connected in series whilst the third
(P) is connected in parallel to S1 and S2. This
allows different combinations of pilot valves to
be used, thus providing numerous variations in
control functions.
Connections
There is a very wide range of connection types
available with ICS valves:
• D: Butt weld, DIN (2448)
• A: Butt weld, ANSI (B 36.10)
• J: Butt weld, JIS (B S 602)
• SOC: Socket weld, ANSI (B 16.11)
• SD: Solder connection, DIN (2856)
• SA: Solder connection, ANSI (B 16.22)
• FPT: Female pipe thread (ANSI/ASME B 1.20.1)
Approvals
The ICV valve concept is designed to fulfill global
refrigeration requirements.
For specific approval information, please contact
Danfoss.
The ICS valves are approved in accordance with
the European standard specified in the Pressure
Equipment Directive and are CE marked.
For further details / restrictions - see Installation
Instruction
Valve body and top cover material
Low temperature steel

Danfoss ICS1-65+CVP,ICS3-100-150DIN Pilot-operated servo valves Function

The ICS main valve is a pilot operated valve. The
types of pilot valves used determine the function.
The ICS main valve with pilot valve(s) controls
refrigerant flow by modulation or on/off in
accordance with the pilot valve and main valve
status. The manual spindle can be used to open
the valve plate.
The opening degree of the main valve is
determined by the pressure difference
(differential pressure) between pressure p 2 , which
acts on top of the servo piston (3b), and pressure
p 3 , which acts on the underside of the servo
piston.
If this pressure difference is 0, the main valve will
be fully closed.
If the pressure difference is 0.2 bar (3 psi) or
greater, the main valve will be fully open.
At pressure differences (p 2 - p 3 ) between 0.07 bar
(1 psi) and 0.2 bar (3 psi), the degree of opening
will be correspondingly proportional.
The port of the throttle cone (3e) is V-shaped,
which provide good regulation characteristic to
pilot operated main valves even at low loads.
P 3 pressure is equal to the valve outlet pressure
(P 4 ), due to a clearance between the piston rod
(3g) and the function module. The opening
degree of the ICS valve is therefore controlled by
the application of P 2 pressure acting on top of
the servo piston, which is equal to or greater than
valve outlet pressure (P 4 ).
p 2 = p 4 ~ closed
p 2 = p 4 + 0.2 bar (3 psi)~ fully open
p 4 ≤ p 2 ≤ p 4 + 0.2 bar (3 psi) ~ proportional degree
of opening.

The maximum pressure (p 2 ) can act on the top of
the servo piston (3b). p 2 normally corresponds to
the pressure, p 1 - ICS main valve inlet pressure.
Inlet pressure p 1 is led, via the drilled channels
(1a, 1b, 2f, 2b (pilot), 2a, 2d) in the valve body (1)
and cover (2) through the individual pilot valves
and onto the top of the servo piston (3b).
The degree of opening of the individual pilot
valves determines the magnitude of pressure
p 2 and thus the degree of opening of the main
valve. The equalisation hole (3f) in the servo
piston (3b) ensures that pressure p 2 is balanced
in accordance with the degree of opening of the
pilot valve.
Note:
When ICS valves with 3 pilot ports are used with
external pressure connector (fig. 2, pos. 61), the
valve port inlet pressure will be isolated.
The ICS can be fitted with just a single screwed-
in pilot valve or external pilot connection. The
degree of opening of the main valve will be in
accordance with the control status of the pilot
valve or external pilot flow control.
ICS main valve with one pilot connection is fully
closed when the pilot valve is fully closed and
fully open when the pilot valve is fully open.
Otherwise the degree of opening of the main
valve is proportional to the degree of opening of
the pilot valve.
The ICS 3 pilot version can be fitted with one,
two, or three pilot valves so that up to three
regulating functions are possible. If the external
pilot connection is used, more functions can be
added.