PWS RECTANGULAR MULTI-BLADE AIRTIGHT DAMPER Characteristics: A rectangular multi-blade damper with backward or concurrent blades and a high level of tightness, used for airflow control or closing. Controlled manually or by an electric actuator. They can be installed in air handling units or in a wall. The design of the damper ensures leakage class 3 – 4 in accordance with EN-1751. 165 [mm] wide blades of the damper are designed in such a way that a 2000 x 2000 [mm] damper can withstand the pressure of 2500 [Pa]. Special sealing inserts installed at the blade ends ensure high integrity. Operating temperature: -20 °C to +90 °C, (+50 °C for the actuator version). Figure 1. PWS damper dimensions. The blades of the damper are mounted on a frame, with the rolling bearing covered on both sides, which ensures long faultfree operation. The damper can operate under very hard environmental conditions (dust and humidity). The individual blades are driven by the system of levers and tie rods in either a PWSp backward or PWSw concurrent arrangement. These features make the damper especially recommended for air handling units, the cross-section horizontal dimension of which exceeds 1400 [mm] horizontally and 1000 [mm] vertically. PWS dampers normally meet leakage class 3 requirements. For special orders, it is possible to make them as leakage class 4 devices. The aluminium profile shape is protected as a utility design and has been registered with the Patent Office of the Republic of Poland. Manufacturing Versions Drive: T1 – Damper with an actuator T2 – Damper with a manual mechanism T3 – Damper with an extended axle (for the actuator installation) Rectangular multi-blade airtight damper The PWS damper housing is made of galvanised sheet steel and the blades are made of aluminium profile. Special inserts with a sleeve seal are installed at the ends of the blades. The blades are mounted in ball bearings embedded in the housing. Figure 2. PWS damper blade. Standard dimensions of PWSp dampers: Width A = 300÷2000 mm (1 mm interval) Height B = 210÷2000 mm (165 mm interval) Standard dimensions of PWSw dampers: Width A = 210÷2000 mm (1 mm interval) Height B = 170÷1820 mm (165 mm interval) Due to the depth of the blade, the recommended height is B = n x 165 + 5, where n is the number of the blades. It is possible to make the damper another height (1 mm interval), with a masking frame covering the clearance partially. A damper with insulated blades, with width A > 1200 mm is divided into modules with a maximum width of 1200 mm. The modules are connected with a common driving axle (single manual mechanism or actuator). If it is necessary to use a damper larger than 2000 x 2000 mm, a combined damper consisting of two smaller dampers is made. The dampers have independent driving axles (two separate manual mechanisms or actuators on op

Technical Data Table 1. Types of actuators and the net surface area for the PWS damper in a fully open position. Table 2. Type of the actuator. ■I (*) - Combined damper 2 x ... Nm requires the use of two smaller dampers with separate actuators. The given actuator types can be used in several variants differing in communication and supply voltage. Chart 1. Pressure loss for a standard-height PWS damper (in a fully open position).

Chart 2. Air leaks through the PWS damper baffle (in a fully closed position ). Chart 3. Air leaks through the PWS damper housing (in a fully closed Table 3. Approximate weight of PWS dampers. Note: the parameters given in the table apply to the dampers with the concurrent blades, blades with no insulation and without an actuator. Rectangular multi-blade airtight damper

When ordering, please provide information as follows: PWS <K> <I> <C> - <A> x <B> - W<W> - T<N> - <KL> * Optional values, if not specified, the default values will be used “additionally provide: actuator manufacturer (Siemens/Belimo); supply voltage (24 V or 230 V), safety functions (with or without spring return), operation of the return spring (spring closes the damper or spring opens the damper), type of control (close/open, 3-point, analog), whether the actuator is to have auxiliary contacts. Rectangular multi-blade airtight damper