Danfoss CVP, CVPP, CVC CVE, EVM, CVH Data sheet
Data Sheet
Pilot valve
Type CVP, CVPP, CVC
CVE, EVM and CVH
Intended for mechanical control of a main valve
Pilot valves are intended for mechanical control
of a main valve and are ready for direct
installation in the top cover of the main valve.
Small capacities can be controlled by the pilot
valve directly without a main valve when
installed in the matching CVH housing.
The extensive range of Danfoss pilot valves
include:
• Constant-pressure pilot valve, type CVP
• Dierential-pressure pilot valve, type CVPP
• Pressure-operated pilot valve with reference
pressure connection, type CVC
• Electronically operated constant-pressure
pilot valve, type CVE
• Solenoid pilot valve, type EVM (NC)
• Solenoid pilot valve, type EVM (NO)
• Housing, type CVH for pilot valves, for
mounting in external pilot lines
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Pilot valve, type CVP, CVPP, CVC, CVE, EVM and CVH
Features
• Applicable to HCFC, non ammable HFC, R717 (Ammonia) and R744 (CO2). The use of Pilots with ammable
hydrocarbons is not recommended
• Extremely accurate pressure and temperature control.
• The pilot valves can be screwed directly into the main valve, thus avoiding the necessity of welding, soldering and
separate pilot lines.
• The pilot valves can be mounted directly in the ICS, PM or ICF valve or it can be connected via an external pilot line
and a CVH housing.
• All pilot valves can be used on all sizes of main valves.
• Several pilot valves can be connected in series or in parallel to provide many functions in the same ICS or ICF valve.
• All pilot valves are delivered with gaskets.
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Pilot valve, type CVP, CVPP, CVC, CVE, EVM and CVH
Functions
Constant-pressure pilot valve, type CVP
The kv/Cv value is measured with the pilot valve mounted in a CVH housing for external pilot lines. The value can
vary slightly, depending on the setting value.
Figure 1: CVP
CVP is a constant-pressure pilot valve for a max. working pressure (MWP) of 52 bar (754 psig) and with 3 setting
ranges covering settings of -0.66 to 52 bar (19.5 in. Hg to 754 psig). This pilot valve is used for maintaining a
constant pressure on the inlet side of the main valve.
When a CVP is mounted in a CVH housing, it can be used as a separate constant-pressure valve or a pressure relief
valve (e.g. to prevent hydraulic overpressure in an entrapped liquid).
NOTE:
The CVP pilot can be used for most applications in the refrigeration system including hot gas relief systems.
Dierential-pressure pilot valve, type CVPP
The kv/Cv value is measured with the pilot valve mounted in a CVH housing for external pilot lines. The value can
vary slightly, depending on the setting value.
Figure 2: CVPP
CVPP is a dierential-pressure pilot valve for a max. working pressure (MWP) of 52 bar (754 psig) and with 2 setting
ranges covering settings of -0.66 to 28 bar (19.5 in. Hg to 406 psig). The pilot valve is used for maintaining a constant
dierential pressure between the CVPP valve reference pressure connection and the main valve inlet pressure.
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Pilot valve, type CVP, CVPP, CVC, CVE, EVM and CVH
CVPP incorporates a diaphragm so that the reference pressure and the refrigerant in the valve are physically
separated. The pilot valve can therefore also be used as a pneumatic control valve either to control a main valve or
as a separate pneumatic valve mounted in a CVH housing.
Pressure-operated pilot valve with reference pressure connection, type CVC
The reference pressure must be connected to the low-pressure side of the system. The kv/Cv value is measured with
the pilot valve mounted in a CVH housing for external pilot lines. The value can vary slightly, depending on the
setting value.
Figure 3: CVC
CVC is a constant pressure pilot valve at an external reference point for a max. working pressure (MWP) of 52 bar
(754 psig) and with 2 setting ranges covering settings of -0.66 to 28 bar (19.5 in. Hg to 406 psig). The CVC-pilot is
designed to maintain a constant pressure at an external reference point in the system.
CVC pilot valve installed in an ICS servo valve are used for e.g.:
• Outlet pressure regulator to regulate max. suction pressure, e.g. as a compressor crankcase pressure regulator.
• Outlet pressure regulator as a pressure limiter, e.g. for hot gas defrost of hot gas lines.
Electronically operated constant-pressure (constant pressure dierence) pilot valve, type
CVE
The kv/Cv value is measured with the pilot valve mounted in a CVH housing for external pilot lines. The value can
vary slightly, depending on the setting value.
Figure 4: CVE
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EVM (NC)
EVM (NO)
Pilot valve, type CVP, CVPP, CVC, CVE, EVM and CVH
CVE is, when tted with the ICAD 1200A stepper motor, a constant pressure pilot valve with electronic change of
set-point for a max. working pressure (MWP) of 52 bar (754 psig) and with electronic controlled full range settings of
-0.66 to 8 bar gauge (19.5 in. Hg to 116 psig). The CVE interface to the ICAD is hermetic closed and rotation force is
transferred from the ICAD by magnetic forces.
The CVE pilot valve is designed to maintain a constant and very accurate inlet pressure of an ICS servo valve, e.g.
evaporator pressure regulation.
The CVE/ICAD unit can be either stand-alone or connected to a remote EKC 361/EKE 400 or PLC with appropriate
controller function.
The stand-alone arrangement allows the on-site ICAD setting - and the remote wiring allows remote setting of the
desired set pressure.
Solenoid pilot valve, type EVM (NC) and EVM (NO)
The kv/Cv value is measured with the pilot valve mounted in a CVH housing for external pilot lines.
MOPD: Maximum opening dierential pressure with a 10 W a.c. coil.
With:
20 W a.c. coil: 40 bar (580 psig)
20 W d.c. coil: 14 bar (203 psig)
MCPD: Maximum closing dierential pressure with a 10/12 W a.c. coil or a 20 W d.c.coil.
Table 1: Solenoid pilot valve, type EVM (NC) and type EVM (NO)
EVM is a solenoid pilot valve for use when on/ o operation of the main valve is required. EVM valves are intended
for use with Danfoss solenoid valve coils (“Coils for solenoid valves”, data sheet DKRCC.PD.BS0.F). Together with CVH,
an EVM can also be used as an independent solenoid valve.
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Pilot valve, type CVP, CVPP, CVC, CVE, EVM and CVH
Media
Refrigerants
Applicable to HCFC, non ammable HFC, R717 (Ammonia) and R744 (CO2). The use of pilot valves with ammable
hydrocarbons is not recommended
New refrigerants
Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.
When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the
refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic
refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.
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