Hvac
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Figure 1. A conventional thermostatic expansion valve (TXV or TEV) is controlled by springs, bellows, and push rods. (Graphics courtesy of Sporlan Valve Co.)
The function of the thermostatic expansion valve (TXV or TEV) is to hold a constant evaporator superheat. When set and operating properly, the TXV will keep the evaporator active throughout its entire length.
The conventional TXV is controlled by springs, bellows, and push rods. (See Figure 1.) The spring force is a closing force on the TXV. The evaporator pressure, which acts under the thermostatic element's diaphragm, is also a closing force. An opening force is the remote bulb force, which acts on top of the thermostatic element's diaphragm.
There is also a liquid force from the liquid line, which acts on the face of the needle valve and has a tendency to open the valve. However, this force is cancelled out when using a balanced port TXV. Working together, these forces maintain a constant evaporator superheat in a refrigeration system. There are no electronic devices associated with a conventional TXV.
The SEH-100 EEV from Sporlan Valve Co.
EEVs
The electronic expansion valve (EEV) operates with a much more sophisticated design. EEVs control the flow of refrigerant entering a direct expansion evaporator. They do this in response to signals sent to them by an electronic controller. A small motor is used to open and close the valve port. The motor is
Expo Releases a Deluge of Valve Info
Tuesday, Jan. 27, 2004: Sporlan Offers New Electronic Expansion Valves
Sporlan Division, Parker Hannifin Corp.: Electric Distributor Expansion Valve
Sporlan Division - Parker Hannifin Corp.: Electric Distributor Expansion Valve
Nov. 17, 2006: Swedish HVACR Invention Earns Prize
Parker Hannifin Corp., Sporlan Div.: Electronic Valve Controller
RELATED PRODUCTS
Refrigeration Fundamentals for HVAC/R Technicians DVD
Understanding TXV Refrigeration Systems: Superheat and Subcooling DVD
Figure 1. A conventional thermostatic expansion valve (TXV or TEV) is controlled by springs, bellows, and push rods. (Graphics courtesy of Sporlan Valve Co.)
The function of the thermostatic expansion valve (TXV or TEV) is to hold a constant evaporator superheat. When set and operating properly, the TXV will keep the evaporator active throughout its entire length.
The conventional TXV is controlled by springs, bellows, and push rods. (See Figure 1.) The spring force is a closing force on the TXV. The evaporator pressure, which acts under the thermostatic element's diaphragm, is also a closing force. An opening force is the remote bulb force, which acts on top of the thermostatic element's diaphragm.
There is also a liquid force from the liquid line, which acts on the face of the needle valve and has a tendency to open the valve. However, this force is cancelled out when using a balanced port TXV. Working together, these forces maintain a constant evaporator superheat in a refrigeration system. There are no electronic devices associated with a conventional TXV.
The SEH-100 EEV from Sporlan Valve Co.
EEVs
The electronic expansion valve (EEV) operates with a much more sophisticated design. EEVs control the flow of refrigerant entering a direct expansion evaporator. They do this in response to signals sent to them by an electronic controller. A small motor is used to open and close the valve port. The motor is