Data Sheet
Temperature regulating valve
Type ORV
Assures optimal oil temperature control in refrigeration systems
ORV are 3-way industrial valves for maintaining
a constant oil temperature in gas compressor
systems, by mixing hot and cold oil in the
lubricating system of e.g. screw or turbo type
compressors.
The ORV valves are with few components and
with extended cylindrical connections, to
ensure ease of installation and service.
Features
• Stainless steel nickel plated thermostatic
element.
• Butt-weld (DIN, ANSI) or socket weld (SOC)
connection.
• No manual adjustment.
• Plug and Play design.
• Optimised ow characteristics.
• Robust design.
• High resistance against vibrations or shock.
• Can be mounted in any direction.
• Easy to dismantle and service when required.
• Classication: DNV, CRN, BV, EAC etc. To get
an updated list of certication on the
products please contact your local Danfoss
Sales Company.
AI176286419819en-001001
Fig 1.1
Fig. 1.2
Fig. 1.3
C
A
B
A
C
B
C
A
B
Temperature regulating valve, type ORV
Functions
Mixing operation
ORV valve can work as a mixing or diverting valve. The ORV temperature regulating valve utilises high coecient of
thermal expansion of wax to create the internal movement necessary to have a cold and a hot inlet mixing to a
common outlet. The outlet temperature corresponds to the nominal temperature of the thermostatic element.
The valve house has three ports:
• Port A is used for the common outlet
• Port B is for the hot inlet
• Port C is for the cold inlet
When the compressor unit is cold at start up, the thermostatic element will be contracted to let the full ow from
port B pass until the nominal temperature (-12 °C / 10°F) is reached (Figure 1: Valve house(g. 1.1)). The thermostatic
element will then begin to extract to let the outlet become a mixture of hot and cold oil.
When the nominal temperature is reached, the element is positioned in approximately half open position (Figure 1:
Valve house(g. 1.2)). If the temperature is reaching approximately the nominal temperature plus 5 °C / 9 °F, the
thermostatic element has been extracted to its fully open position (Figure 1: Valve house(g. 1.3)). In this position
the oil temperature will only come from the cold inlet port (C) from oil cooler.
Figure 1: Valve house
From Figure 1: Valve house, it can be seen how the sleeve on the element is sliding in a vertical direction. The
thermostatic element is kept in position by a spring.
Diverting operation
Diverting operation is similar to the mixing operation. It is carried out with separation in to two of the uid with
single temperature. Due to that the temperature on the inlet is very stable fact the regulation is very smooth. The
inlet temperature would correspond to the nominal temperature of the thermostatic element.
The valve house has three ports:
• Port A is used for the common inlet
• Port B is for the cold outlet
• Port C is for the warm outlet
The diverting operation otherwise is similar to the mixing operation.
© Danfoss | Climate Solutions | 2021.02 AI176286419819en-001001 | 2
Fig. 1.1 Fig. 1.2 Fig. 1.3
C
A
B
B
A
C
B
A
C
Temperature regulating valve, type ORV
© Danfoss | Climate Solutions | 2021.02 AI176286419819en-001001 | 3
Danfoss
Tapp_0084_02
10-2012
Danfoss
Tapp_0085_02
10-2012
Temperature regulating valve, type ORV
Application
Examples
Figure 2: Example of the system with ORV for mixing operation
Figure 3: Example of the system with ORV for diverting operation
© Danfoss | Climate Solutions | 2021.02 AI176286419819en-001001 | 4
Temperature regulating valve, type ORV
Media
Refrigerants
Oils:
Applicable to all common refrigeration oils.
Refrigerants:
Applicable to HC, HCFC, HFC, R717 (Ammonia) and R744 (CO2).
For further information please refer to installation instruction for ORV.
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.
© Danfoss | Climate Solutions | 2021.02 AI176286419819en-001001 | 5
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