The simple and cost-efficient solution for refrigerant expansion.

WITT HR 2 high-pressure float regulator
WITT HR 2 high-pressure float regulator

The mechanically operated WITT highside float regulators helps you to save energy while offering a high level of safety without a need for additional electrical cables and controls.

The principle is as simple as it is effective. When the refrigeration capacity increases will the liquid level in the highside float regulator rise and the refrigerant expands via the entirely mechanical operated float valve orifice opening. Due to this expansion (pressure loss) in the outlet opening there will be a liquid-vapour mixture behind the HP float regulator that is drained back to the surge drum. A high pressure receiver is normally not required.

The continuous expansion of the highside float valve eliminates pressure fluctuations and flash gas is reduced. Therefore the electrical power consumption of the compressor is reduced as well.

The flooded operation with highside float valves can take advantage of lower ambient temperatures during the colder seasons with lower condensation temperatures, independent of the control system. And with a 5K lower condensation temperature you already save about 13% electrical energy consumption.

Capacity data

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Capacity [kW] Overall height incl. valves [mm] Diameter [mm] Depth [mm] Connections [DN] Weight [kg]
HR 1 BW 40 * 310 200 365 25 10
HR 1 95 * 440 200 425 25 13
HR 2 390 * 480 250 445 32 23
HR 3 1,160 * 640 345 555 50 54
HR 4 3,345 * 910 406 765 80 135
HS 30 1,045 * 510 290 655 100 / 50 49
HS 40 2,815 * 685 400 775 150 / 80 107
HS 50 4,745 * 855 406 765 200 / 80 135
WP 2 HR 260 ** 460 250 475 32 26
WP 3 HR-65 860 ** 545 355 650 50 68

* Refrigerant: NH3, T0 = -10°C, TC = +35°C | ** Refrigerant: NH3, T0 = +35°C, TC = +75°

Max. permitted pressure PS [bar] Test pressure [bar]
at +75/-10 °C at +90/-10 °C at +75/-10 °C at -10/-60°C
HR 1 BW 25 18.75 37
HR 1 25 18.75 37
HR 2 25 18.75 37
HR 3 25 18.75 37
HR 4 25 18.75 37
HS 30 40 30 59
HS 40 40 30 59
HS 50 25 18.75 37
WP 2 HR 40 30 59
WP 3 HR-65 65 48.75 100

Effektive hot gas defrost with highside float regulators

The WITT high side float regulator will increase the efficiency of your hot gas defrost of evaporators. Since the highside float regulator will drain only liquid refrigerant and gas cannot pass by, energy loss of hot gas by-pass is eliminated. Compared to other defrost methods up to 50% electrical energy is saved this way.

Article numbers for variants & accessories

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Product overview HR
Product overview HR
Product overview HR
Product overview HR
Product overview HR
Product overview HR
Product overview HS
Product overview HS
Product overview HS
Product overview HS
Product overview HS
Product overview HS
Product overview HS & accessories
Product overview HS & accessories
Product overview HS & accessories
WP 3
WP 3
WP 3

Are you interested in an HR or HS high-pressure float regulator?

Just use our easy contact form.

We then select the perfect model for you.

Of course, you can select a variant for yourself with our selection program “WITT Select”.

HR & HS high-pressure float regulator type HR 1 BW
HR & HS high-pressure float regulator type HR 1 BW
HR 1 BW
HR & HS - highside float regulator Type HR 2 with valves
HR & HS - highside float regulator Type HR 2 with valves
HR 2 with valves
HR & HS high-pressure float regulator type HR 4 with valves on stand
HR & HS high-pressure float regulator type HR 4 with valves on stand
HR 4 with valves on stand
HR & HS high-pressure float regulator type WP 3 HR
HR & HS high-pressure float regulator type WP 3 HR
WP 3 HR
HR & HS high-pressure float regulator type HS 30 with valve
HR & HS high-pressure float regulator type HS 30 with valve
HS 30 with valve

Applications