Danfoss ORV 25-80 Temperature Regulating Valve Installation Guide
- June 3, 2024
- Danfoss
Table of Contents
Installation Guide
Temperature regulating valve
ORV 25-80 (1-3 in.)
Installation
Oils
Applicable to all common refrigeration oils.
Refrigerants
Applicable to all common refrigerants, including R717 and non-corrosive gases/
liquids dependent onsealing material compatibility.
The valve is only recommended for use in closed circuits.
For further information please contact Danfoss.
Temperature range
Minimum operating temperature: ≥ −10ºC (14ºF)
Max. temperature limit based on the element temperature settings:
| Types | Max limit |
|---|---|
| 43 °C / 110 °F | 77 °C / 170 °F |
| 49 °C / 120 °F | 82 °C / 180 °F |
| 60 °C / 140 °F | 93 °C / 200 °F |
| 77 °C / 170 °F | 110 °C / 230 °F |
Pressure range
The valves are designed for a max.
working pressure of 40 bar g (580 psi g.)
Installation (Fig. 1)
The valve can be installed in any position (fig. 1), however, oil spills can
be avoided when servicing, if the top is mounted vertically upwards. The valve
is designed to withstand a high internal pressure. However, the piping system
should be designed to reduce the risk of hydraulic pressure caused by thermal
expansion. It must be ensured that the valve is protected from pressure
transients like accelerated liquid in the system.
Recommended flow direction (Fig. 2)
To achieve correct flow direction and function, the letter designations, A, B
and C on the valve housing must be followed as shown in fig. 2. Refer to the
technical leaflet to find application example.
Welding (Fig. 3)
The top cover (2), gasket (6), spring (5), and thermostatic element (7), must
be removed before welding (fig. 3), to prevent damage to the thermostatic
element sensor (7).
(This must be done if the valve has not been ordered from the parts program.
When ordering from the parts program the element is not mounted in the valve).
The teflon glide ring (3), in the housing (1), should be removed if the
temperature will exceed 240°C (460° F). Only materials and welding methods,
compatible with the valve housing material, should be used.
The valve should be cleaned internally to remove weld debris on completion and
before the valve is reassembled.
Weld debris and dirt in the interior of the housing and on the glide ring
should be avoided. Temperature during welding can be limited to the required
limit depending on welding method and any cooling applied to the valve body.
(Cooling can be ensured by, for example, wrapping a wet cloth around the valve
body). Damage to the teflon glide ring should be avoided. The valve housing
must be free from stresses (external loads) after installation.
Assembly (Fig. 5)
Remove weld debris and any dirt from pipes and valve body before assembly.
Check that the Teflon glide ring is free from damage prior to mounting the
thermostatic element (fig. 5).
Tightening (Fig. 4)
Tighten the top cover bolts using a torque wrench, to the values indicated in
the table (fig. 4). Over tightening can cause damage to the gasket.
Colours and identification
The ORV valves are painted with a red oxide primer from the factory. Precise
identification of the valve is made via the cast text on the valve body and
top. The external surface of the valve housing must be treated with a suitable
protective coating after installation and assembly.
Maintenance
Servicing
The ORV will fail if the thermostatic element is worn out.
It is recommended that the thermostatic element is function tested if the
temperature control is not responding as designed.
Test of thermostatic element (Fig. 6)
After dismounting of the thermostatic element observe the element position. If
the temperature of the actuator is approx. 20°C (68°F), the element should
look as shown in fig. 6a.
Insert the active part of the element into water. Make sure that the water
temperature is equal to “the set temperature” added 6ºC / 43 ºF (see fig. 6b).
The set temperature can be read from the ingraving on the thermostatic element
(see fig. 6a).
Observe the element open into a position as shown in fig. 6b. The difference
between fully open and fully closed should be approx. 9.5 mm (0.375 in.). The
element must be replaced if this stroke cannot be achieved.
Glide ring
The surface of the glide ring must be inspected to ensure that no damage has
occurred. Scratch marks and the like can cause oil flow to bypass the element
making the temperature regulation less accurate.
Assembly (Fig. 5)
Remove any dirt from the body before the valve is assembled. Check that the
thermostatic element and top gasket are in position.
Lubricate the glide ring for ease of fitting of the thermostatic element.
Excessive force can damage the glide ring. Only apply moderate force.
Reposition and secure top.
Tightening (Fig. 4)
Tighten the top bolts with a torque wrench, to the values indicated in the
table (fig. 4). Over tightening can cause damage to the gasket.
Use only original Danfoss parts, including thermostatic elements, gaskets and
glide rings for replacement. Materials of new parts are certified for the
relevant refrigerants and oils.
In cases of doubt, please contact Danfoss. Danfoss accepts no responsibility
for errors and omissions. Danfoss Industrial Refrigeration reserves the right
to make changes to products and specifications without prior notice.
Danfoss A/S Climate Solutions • danfoss.com • +45 7488
2222
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