Pressure relief damper, type KL-E with control function
The Pressure Relief Damper Type KL-E is a design variant provided with control function which, as soon as then opening pressure is exceeded, keeps nearly constant the pressure in the ductwork, independent of the range of volume flow. When the pressure in the ductwork reduces to its normal range after the malfunction has been remedied, the damper closes automatically.
Pressure relief damper, type KL-EM with switching function
The Pressure Relief Damper Type KL-EM features a switching function. Independent of the range of volume flow of the outlet flow the damper blade gets fully opened when the opening pressure is exceeded. When the pressure in the ductwork falls below the opening pressure after the malfunction has been remedied, the damper normally remains open. In this state of operation the damper type KL-EM must be closed manually, whereas it closes automatically when the flow is interrupted, e. g. by disabling of the fan. Despite its smaller outside dimensions type
KL-EM is capable of removing flows at higher range of volume flow as compared with type KL-E.
Pressure relief damper, type KL-ETE (at high volume flow) and KL-ETM (at low volume flow)
It is often required that a defined pressure gradient of 50 − 150 Pa is set between two neighboring rooms. This guarantees a directed flow of air in the leakage ports existing between the rooms and thus avoids the undesired transport of pollutants into the room to be protected. Pressure relief dampers type KL-ETE can be used in this application both as control device for setting a defined pressure gradient between two rooms and as safety valveto set a limit to a maximum admissible pressure value. Depending on available space and range of volume flow to be relieved pressure relief damper type KL-ETE or type KL-ETM is the optimal choice.