Electrical control valves and applicable controllers

Refrigeration, Air-Conditioning, Water Chillers.

Minimum evaporating temperature -100 deg C
2kW ....16.5kW for R22, EX4 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
5kW ....50kW for R22, EX5 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
15kW ....120kW for R22, EX6 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.

Minimum evaporating temperature -50 deg C
35kW ....330kW for R22, EX7 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
90kW ....880kW for R22, EX8 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.

Same valve used for all refrigerants: R22, R134a, R407C, R404A, R507, R410A, R744 etc)

* Not released for use with caustic, poisonous or flammable substances.

Universal stepper motor control EXD-U

The universal stepper motor control EXD-U is used in all other commercial refrigeration and air-conditioning applications. Opening of the electrical control valve follows exactly the analog input signal of 0 ....10V or 4.... 20mA. The digital input signal is used to close the valve independently from analog input. When the digital signal switches the controller on again, the valve opens to the opening specified by the analog input. The optional selectable 'Start mode' first opens the valve 1/3 opening and then to the analog set point.

Advantages of EX Series Electrical Control Valves - Part 1

Valve seat and slider are made out of solid ceramic. Positive shut-off function eliminate the need for additional solenoid valve. The special form of the valve slide provides for proper floating through the valve and highly linear capacity characteristic between 10% and 100% of maximum capacity.

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Superheat controller EC3-X33 with built-in backup battery and display unit ECD-002

The new electronic superheat controllers EC3-X33 control the superheat at the evaporator. A complete system consisting of electric control valve, superheat controller, temperature and pressure sensor controls the superheat exactly to set point, independent from condensing pressure. The MOP function protects the compressor from dangerous overload conditions. The positive shut-off function eliminates the use of an additional solenoid valve, because the built-in backup battery closes the valve after power is lost. The controller can be easily adjusted for each refrigerant and valve type.

The Electronic Controllers from Emerson

The controller is responsible for the various control tasks. Emerson controllers are optimized for the requirements of refrigeration and air-conditioning and perform all control tasks which have been performed by conventional valves in the past, as superheat control or capacity control.

How energy is saved by applying electrical control valves?

The recent energy price increases caused an explosion in the system operating cost. Reducing energy consumption saves money and as a beautiful side effect protects the environment.

Refrigeration and air-conditioning systems belong to the big energy consumers all over the world. Means to reduce the energy consumption have a strong effect on the cost.

Under full load conditions or fixed condensing pressure, conventional, as well as electronic systems operate efficiently. Under partial load or floating condensing pressure, which happens at low ambient temperature (e.g. at cloudly weather, at night, in spring, fall or winter) the condensing pressure decreases. In this case, thermal expansion valves tend to oscillate, which decreases their lifetime. Systems with electronic valves and controllers operate in partial load in the same exact and stable manner as under load. This potential to save energy is best at low condensing pressure.