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

• Dierential-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.

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).

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NOTE:

The CVP pilot can be used for most applications in the refrigeration system including hot gas relief systems.

Dierential-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 dierential-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 dierential pressure between the CVPP valve reference pressure connection and the main valve inlet pressure.

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 dierence) 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

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 dierential 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 dierential 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.

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 specic refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

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