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Catalog excerpts
![JZ-LL - 1](https://img.directindustry.com/pdf/repository_di/16696/jz-ll-753680_1m.jpg)
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
Open the catalog to page 1![JZ-LL - 2](https://img.directindustry.com/pdf/repository_di/16696/jz-ll-753680_2m.jpg)
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 –...
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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...
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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...
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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,...
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Multileaf dampers JZ-LL, JZ-LL-A2, sound power level for a closed multileaf damper PD - JZ-LL - 6 TROX ®TECHNIK
Open the catalog to page 6![JZ-LL - 7](https://img.directindustry.com/pdf/repository_di/16696/jz-ll-753680_7m.jpg)
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...
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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....
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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:...
Open the catalog to page 9![JZ-LL - 10](https://img.directindustry.com/pdf/repository_di/16696/jz-ll-753680_10m.jpg)
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...
Open the catalog to page 10![JZ-LL - 11](https://img.directindustry.com/pdf/repository_di/16696/jz-ll-753680_11m.jpg)
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
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