Multileaf dampers Type JZ-LL Opposed blades For extremely low-leakage shut-off in air conditioning ​ systems Rectangular multileaf dampers for volume flow and pressure control as well as for ​ extremely low-leakage shut-off of ducts and openings in walls and ceiling slabs ■■ Maximum dimensions 2000 × 1995 mm ■■ Closed blade air leakage to EN 1751, classes 3 – 4, depending on size ■■ Casing air leakage to EN 1751, class C ■■ Aerofoil opposed action blades ■■ Closed cell side seals meet increased hygiene requirements Closed cell side seals ■■ Blades interconnected by external linkage ■■ Available in standard sizes and many intermediate sizes Optional equipment and accessories ■■ Actuators: Open/Close actuators, modulating actuators ■■ Explosion-proof construction with pneumatic actuator or spring return actuator ■■ Powder-coated construc

Multileaf dampers General information Type JZ-LL Page General information Function Technical data Quick sizing Specification text Order code Variants Attachments Dimensions and weight Product details Installation details Basic information and nomenclature Application – Multileaf dampers of Type JZLL are used as an ​ acting element in the volume flow and pressure ​ control in air conditioning systems – For extremely low-leakage shut-off of ducts and​ openings in walls and ceiling slabs – Stainless steel and powder-coated ​ constructions with increased corrosion ​ resistance if required – Steel...

Multileaf dampers General information Accessories – Installation subframe: Installation subframe for ​ the fast and simple installation of multileaf ​ dampers Construction features – Rectangular casing, welded (P1: casing with ​ screws), material thickness 1.25 mm – Blades, material thickness 1 mm – Flanges on both sides, suitable for duct ​ connection, either flange holes or corner holes – External linkage, robust and durable, ​ onsisting c of the coupling rod and and ​ orizontal arms h – Blade shafts, Ø12 mm, with notch to indicate ​ the blade position (not for attachment ZS99) – With drive...

Multileaf dampers Functional description Multileaf dampers with external linkage can have ​ parallel action blades or opposed action blades. An external linkage transfers the synchronous ​ rotational movement from the drive arm to the ​ individual blades. Even very large multileaf ​ dampers can be safely opened and closed with ​ this type of linkage. Opposed action blades close at different speeds ​ since the linkage includes a transverse link. This ​ facilitates the closing process and reduces the ​ closed blade air leakage. ① Casing ② Slide disc ③ Opposed blades ④ Side seal ⑤ Blade tip seal...

Multileaf dampers Technical data The torque for closing a multileaf damper must be ​ such that the damper can be safely opened and ​ closed. For closure, the torque must suffice to ensure ​ complete shut-off by the blades. Opening is initiated without aerodynamic forces. When air flows through the damper, the ​ aerodynamic forces of the airflow create a closing ​ force (torque) on the blades; this happens ​ independent of the direction of the airflow. This ​ closing force must be countered, or overcome. ​ The blade position, or blade angle α, for which ​ there is the largest torque depends, among...

Multileaf dampers JZ-LL, JZ-LL-A2, sound power level for a closed multileaf damper PD - JZ-LL - 6 TROX ®TECHNIK

Multileaf dampers Quick sizing Quick sizing tables provide a good overview of the ​ sound power levels and differential pressures that ​ can be expected. Approximate intermediate ​ values can be interpolated. Precise intermediate ​ values and spectral data can be calculated with ​ our Easy Product Finder design programme. The sound power levels LWA apply to multileaf ​ dampers with a cross-sectional area (B × H) of ​ 1 m². The differential pressures apply to multileaf ​ dampers installed in ducts (installation type A). JZ-LL, JZ-LL-A2, JZ-HL, differential pressure and sound power level v m/s...

Multileaf dampers Specification text This specification text describes the general ​ properties of the product. Texts for variants can be ​ generated with our Easy Product Finder design ​ programme. Rectangular multileaf dampers for volume flow ​ and pressure control as well as for low-leakage ​ shut-off of ducts and openings in walls and ceiling ​ slabs. Ready-to-operate unit which consists of the ​ casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct ​ connection. The blade position is indicated externally by a ​ notch in the blade shaft extension. Closed...

Multileaf dampers Order code  Type JZ-LL Low-leakage multileaf damper, Closed ​ blade air leakage to EN 1751, classes ​ 3 – 4  Installation subframe No entry: none ER With (only for construction G)  Attachments No entry: none Z04 – Z07 Quadrant stay Z12 – Z51 Actuators ZF01 – ZF15 Spring return actuators Z60 – Z77 Pneumatic actuators  Material No entry: galvanised steel A2 Stainless steel  Duct connection No entry: corner holes on both sides G Flange holes on both sides (no corner ​ holes) Explosion-proof actuators Z1EX, Z3EX Electric Z60EX – Z77EX Pneumatic  Bearings No entry: plastic...

Multileaf dampers Multileaf damper, variant JZ-LL Multileaf damper with explosion-proof actuator JZ-LL Variant – JZ-LL: Multileaf damper with opposed blade ​ action, made of galvanised sheet steel Materials and surfaces – Casing and blades made of galvanised sheet ​ steel – Blade shafts, drive arm and external linkage ​ made of galvanised steel – Blade tip seals made of PP/PTV plastic – Side seals made of closed cell PE foam – P1: Powder-coated, RAL CLASSIC colour – PS: Powder-coated, DB colour Multileaf damper, variant JZ-LL-A2 Multileaf damper with actuator Variant – JZ-LL-A2: Multileaf damper...

Multileaf dampers blade action, made of stainless steel Materials and surfaces - Casing, blades and external linkage made of stainless steel, material no. 1.4301 - Shafts made of stainless steel, material no. 1.4305 Blade tip seals made of PP/PTV plastic Side seals made of closed cell PE foam P1: Powder-coated, RAL CLASSIC colour PS: Powder-coated, DB colour 09/2017 - DE/en TROX ®TECHNIK PD - JZ-LL - 11