Danfoss Types PHTX85/PHTX300/067B3303 Thermostatic expansion valves Introduction
PHT thermostatic expansion valves regulate the injection of refrigerant liquid into evaporators.Injection is controlled by the refrigerant superheat.Therefore the valves are especially suitable for liquid injection in ”dry“ evaporators where the superheat at the evaporator outlet is proportional to the evaporator load.
Danfoss Types PHTX85/PHTX300/067B3303 Thermostatic expansion valves Features
Range:
–40 to +50°C
Equally applicable to freezing, refrigeration and air conditioning plant.
Interchangeable orifi ce assembly
- easier stocking
- easy capacity matching
- better service.
Very tight main orifi ce Also used as solenoid valve (not PHT 300) -
see the section "Design - Function" Rated capacities from 105 to 1890 kW
(30 to 540 TR) for R22 Can be supplied with MOP (Max. Operating Pressure)
Protects the compressor motor against excessive evaporating pressure. Patented double contact bulb Fast and easy to install. Good temperature transfer from pipe to bulb.
Danfoss Types PHTX85/PHTX300/067B3303 Thermostatic expansion valves Technical data
Refrigerants
R22, R470C, R134a, R404A / R507
Max. temperature
Bulb, when valve is installed: 100°C
Bulb, element not mounted: 60°C
Min. temperature
–50°C
Max. test pressure
PHT 85 and 125:
PT = 42 bar
PHT 300:
PT = 28 bar
Maximum working pressure
PHT 85 and 125:
PS / MWP = 28 bar
PHT 300:
PS / MWP = 20 bar
Superheat
Static superheat SS can be adjusted with setting
spindle (?).
The standard superheat setting SS is 4 K.
Danfoss Types PHTX85/PHTX300/067B3303 Thermostatic expansion valves Design Function
General
PHT valves have an interchangeable orifi ce assembly.PHT valves are built up of three interchangeable main components:
I. Thermostatic element, pos. 1
II. Orifi ce assembly, pos. 2
III. Valve body with connections, pos. 3
Including Insert, pos. 7
For the same valve type and refrigerant, the associated orifi ce assembly is suitable for all vers ions of valve body and in all evaporating tem pe ra tu re ranges. The charge in the thermostatic element depends on the evaporating temperature range. A tefl on valve plate (pos. 10) in the main valve (not PHT 300) ensures a tight main orifi ce. All valves with external pressure equalization (pos. 5).The double contact bulb gives fast and precise reaction to temperature changes in the evaporator. It also makes fi tting the bulb quick and easy. The valves are able to withstand the eff ects that normally occur with hot gas defrosting. To ensure long operating life, the valve cone and seat are made of a special alloy with particularly good wear qualities.
Danfoss Types PHTX85/PHTX300/067B3303 Thermostatic expansion valves selection
PHT 85 1 30 105 16 55 20 69 026H1160
PHT 85 2 50 175 26 92 33 114 026H1161
PHT 85 3 80 280 39 138 52 182 026H1162
PHT 85 4 130 455 59 208 72 273 026H1163
PHT 125 1 225 790 125 438 156 545 026H1164
PHT 300 1 325 1140 178 622 221 773 026H0165
PHT 300 2 540 1890 309 1083 351 1227 026H0166
