Used Falke Technik Compressor for sale (11,405)

Condition: used, Year of construction: 1998, operating hours: 120,000 h, functionality: fully functional, machine/vehicle number: S97125901, power: 200 kW (271.92 HP), volume flow: 34.1 m³/h, pressure (max.): 7.5 bar, type of cooling: air, Atlas Copco ZT 200 – oil-free rotary tooth compressor including MD 600 dryer For sale is a well-maintained and fully functional compressed air system consisting of an Atlas Copco ZT 200 compressor and an Atlas Copco MD 600 dryer. The system comes from a professional industrial application and was maintained, inspected, and serviced there exclusively with original Atlas Copco maintenance parts, as specified by the manufacturer. The condition is good for its age; the system is operational and fully functional. Technical data – Compressor – Atlas Copco ZT 200 Design: oil-free rotary tooth compressor Pgjdpfx Aioz E U Sms Tsu Type: ZT 200 Power: 200 kW Max. operating pressure: 7.5 bar Operating hours: approx. 120,000 h Speed: 1,495 rpm Year of manufacture: 1998 Serial number: S97125901 Manufacturer: Atlas Copco Airpower, Belgium Control: Atlas Copco Elektronikon Drum dryer – Atlas Copco MD 600 Type: MD 600 Atlas Copco control with SMARTLINK Year of manufacture: 2023 Operating hours: approx. 4,300 h Serial number: 605608 Art.-No.: 170-016733 Manufacturer: Atlas Copco Airpower, Belgium The compressor and the dryer are part of the offer and will only be sold together. Condition: used, in good condition for its age, technically well-maintained, regularly serviced and inspected, fully functional. Inspection possible by arrangement. Further technical documents or information available upon request.

Year of construction: 2007, condition: used, Screw compressor with refrigeration dryer - Manufacturer: Boge - Model: C9 - Year of manufacture: 2007 - Max. pressure: 8 bar - Max. air flow: 1,180 m³/min. - Motor power: 7.5 kW - Width x depth x height: Pgjdpfx Aioz Hm Rke Teu 480 x 987 x 1,234 mm - Volts/Hz: 400/50 - Weight: 210 kg Refrigerated dryer - Boge Ultratroc - Type. SD 0050 AP - max. 16bar - Location: Warehouse, D-32825 Blomberg

Condition: used, Year of construction: 1993, feed pressure 8,0 bar liter capacity 2340 l/min Number of working hours 13382 h voltage 400 V total power requirement 15,0 kW weight of the machine ca. 0,45 t dimensions of the machine ca. 0,0 x 0,8 x 1,3 m Serial no. 1006 Pgodpfx Aez Dxn Asi Tou Operating hours run: 26736 Operating hours load: 18261

Condition: as good as new (ex-display), Year of construction: 2024, pressure (max.): 13 bar, CSA 15/13 SCREW COMPRESSOR, NO. 1,000 Pjdpfez Duc Nox Ai Togu MOUNTED ON 500-LITER TANK WITH DRYER AND FILTERS 11 kW, 15 HP MAXIMUM PRESSURE: 13 BAR 400V/50Hz/3-PHASE FLOW RATE: 1147 L/min NOISE LEVEL: 67 dB(A) DIMENSIONS: 1540x665x1535 mm, WEIGHT: 450 kg Attached: User and maintenance manual CE declaration of conformity

Condition: excellent (used), Year of construction: 2008, PROD. KAESER Podpfjz E Hb Tsx Ai Togu TYPE BSD72 S/N 1909 YEAR 2008 POWER (kW) 37 CAPACITY (m3/min) 7 PRESSURE (bar) 8 HOURS (RUNNING/TOTAL) FREQUENCY CONVERTER no BUILT-IN DRYER no HEAT EXCHANGER no COOLED (AIR/WATER) air ON TANK no DOCUMENTS no

Condition: ready for operation (used), Year of construction: 1999, operating hours: 0 h, PROD. BOGE TYPE SD40 S/N 31412 YEAR 1999 POWER (kW) 30+1.10 CAPACITY (m3/min) 4.30 Podoz E Hhtepfx Ai Togu PRESSURE (bar) 10 HOURS (RUNNING/TOTAL) 17000 / 51100 FREQUENCY CONVERTER no BUILT-IN DRYER yes HEAT EXCHANGER no COOLED BY (AIR/WATER) air ON TANK no DOCUMENTS no CONNECTION 1 1/2 NEW/USED USED

Condition: excellent (used), Year of construction: 2004, S016550 PROD. RENNER Podpfx Aisz Elfdo Tsgu TYPE RSK37 S/N 8470 YEAR 2004 POWER (kW) 37 OUTPUT (m3/min) 6.15 PRESSURE (bar) 8 HOURS (RUNNING/TOTAL) 7166 / 25832 FREQUENCY CONVERTER no BUILT-IN DRYER yes EXCHANGER no COOLED (AIR/WATER) air ON TANK no DOCUMENTS no CONNECTION 1' NEW/USED USED

Condition: excellent (used), Year of construction: 2008, volume flow: 2.61 m³/h, pressure (min.): 11 bar, KAESER ASD 32 screw compressor Motor: 18.5 kW Capacity: 2.61 m³/min Pressure: 11 bar Pgedpfez Nz Uqsx Ai Teu COMPRESSOR IN FULLY OPERATIONAL CONDITION.

Condition: new, Year of construction: 2025, Danish Trolley Destacker suitable for destacking and stacking up to a maximum height of 14 trolleys. Equipped with a frequency controller with force control for safety.Input and output are on the same side.Easy to operate and relocate.Requires a 220 Volt socket within 2 meters of the destacker.Capacity: 3 to 4 trolleys per minute. Technical specifications: Pgsdpez Rc Nxjfx Ai Teu Control system: PLCPower supply: 1 phase + groundAir pressure: Max 8 barAir consumption: approx. 7.5 liters per cycleCladding in standard color RAL 1003Following instruction manuals are available: Dutch, English and German Included: Installation of a low-noise compressor in the above-mentioned Danish trolley destacker. Benefits of a Low-Noise Compressor in the Danish Trolley Destacker:More flexible use in various workspaces. More information or a quote? Do this quick and easily via the Duijndam Machines website! You can also give us a call. See all the available machines at our website. Since 1977 supplier of reliable used agricultural and horticultural equipmentMachines are checked for deliveryExperienced teamWe can help you with getting the machine to your company Duijndam Machines The specialist in used agriculture and horticulture machinery

Condition: excellent (used), Year of construction: 2016, operating hours: 1,158 h, functionality: fully functional, machine/vehicle number: 16-020, overall weight: 450 kg, total length: 1,360 mm, total width: 800 mm, total height: 1,800 mm, fuel type: electric, volume flow: 33 m³/h, pressure (min.): 330 bar, Equipment: compressor, This offer concerns a beautiful Comptrade CTP-S-550E3 diving compressor. The compressor comes with an external filling panel for diving cylinders (5 x 300 bar and 1 x 200 bar). The lever valves were replaced in 2025/2026. I am also including a 50-liter air cylinder. This is a great set, practically ready to use. You just need to connect the electrical wires to the filling panel, and you can start working immediately!!! PERFORMANCE: 550 liters/min Engine speed: 1250 rpm Dimensions: 136/80 cm (width/depth), 180 cm (height) Weight: 450 kg Rated power: 11 kW RUNNING HOURS: Only 1158 hours I have my own transport available. Price from 96-100 EUR, starting from Skierniewice, Poland, to your location, plus 0.33 EUR per kilometer one way. TECHNICAL DATA OF THE COMPRESSOR Medium: breathing air according to DIN 3188 / EN 12021: 2014 Inlet pressure (bar, absolute pressure): 1 + 0.2 Nominal working overpressure (max. bar): 420 Number of compression stages: 4 Number of cylinders: 4 Diameter of 1st stage cylinder (mm): 130 Diameter of 2nd stage cylinder (mm): 60 Diameter of 3rd stage cylinder (mm): 32 Diameter of 4th stage cylinder (mm): 14 Piston stroke (mm): 50 Interstage overpressures: 1st stage (approx. bar): 2.5 – 3.5 2nd stage (approx. bar): 15 – 17 3rd stage (approx. bar): 70 – 75 4th stage (approx. bar): 225 – 400 Air-cooled Lubrication: oil pump Oil quantity (l): 3.8 Type of oil: synthetic oil Permissible ambient temperature: +5°C to +45°C Permissible inclination: 5° Frequency of condensate removal: every 10–15 minutes DRIVE MOTOR: three-phase induction motor (E3) 3×400 V / 50 Hz, 2900 rpm, B3 design, IP 55 Equipment: compressor and motor mounted on a frame equipped with vibration damping elements; the lightweight frame design allows for easy replacement of the drive unit. micron-type inlet filter forced lubrication (oil pump) interstage coolers, final cooler, final mechanical separator for removing oil-water condensate visual oil level indicator on the compressor block final safety valve (set at 225 bar or 330 bar), check valve, thermal motor protection switch, automatic star-delta starting system FILLING PANEL WITH SIX OUTLETS (5 x 300 OR 1 x 200 BAR) AUTOMATIC SHUT-OFF SYSTEM (AUTO-STOP) AUTOMATIC CONDENSATE DRAIN SYSTEM removal of condensate from all interstage separators and the final separator during compressor operation integrated pressure relief starting system (automatic drain upon each device shutdown) condensate tank with a capacity of approximately 5 liters noise dampers, timer to optimize the frequency of condensate draining FILTRATION SYSTEM F 2400 Pgsdoz Rmvcjpfx Ai Tsu transparent COMP TRADE filter cartridge with extended life and saturation indicator; three-stage filtration (drying, neutralization, microfiltration) air quality in accordance with DIN 3188 / EN 12021: 2014 standards filling: MS-AC-MS (ensures air quality in accordance with DIN 3188 / EN 12021: 2014) filter capacity (air volume): 2400 m³ (at an ambient temperature of 20°C) COMPTROL 1 oil level control system with automatic shut-off function and reset button (activation when the minimum oil level is reached in the compressor block); oil level indicator located at the front of the frame. COMPTROL 2 temperature control system with automatic shut-off function and reset button (activation when the maximum temperature is reached in the last stage of compression)

Condition: excellent (used), Year of construction: 2015, functionality: fully functional, ATLAS COPCO XAHS447 STAGE3 mobile compressor with final cooler, fully serviced. Technical data: capacity: 26.6 m3/min; operating pressure: 12 bar; year of manufacture: 2015; engine: CAT C9.3 ACERT 242KW; operating hours: 4431h; The compressor is in perfect working order, ready for operation, with a warranty. Net price: 187,000 PLN Gross price: 230,010 PLN Pjdpfx Ajz Rxu Rji Tsgu The machine is in excellent condition. Links to videos are provided below.

Condition: excellent (used), Year of construction: 2012, functionality: fully functional, ATLAS COPCO XAHS237+ portable compressor with an aftercooler, fully serviced Technical specifications: capacity: 14.20 m3/min; operating pressure: 12 bar; year of manufacture: 2012; Pgjdpfxoz Rxhke Ai Tju DEUTZ 6.1 engine; operating hours: 2056 h. The compressor is in perfect working order and ready for operation, with a warranty. Net price: 119,500 PLN Gross price: 146,985 PLN The machine is in excellent condition. Links to videos are provided below.

Condition: used, Year of construction: 2021, Technical details: feed pressure: 8 bar liter capacity: 620 l total power requirement: 4 kW sound level: 63 dB(A) revolutions per minute of the motor:: 920 Number of cylinders: 2 electrics - voltage/frequency: 400/50 V/Hz Pressure max.: 14,5 bar Pjdpoxrdw Ijfx Ai Tjgu Number of working hours: 2195 h machine weight approx.: 194 kg dimensions L x W x H: 1,24 x 0,85 x 1,20 m Professional, soundproofed compressor with the lowest noise level in its class, designed to eliminate noise problems in working environments. The powerful 5.5 hp pump unit guarantees maximum efficiency and reliability. It is also equipped with an additional intake silencer, a belt tensioning device that regulates belt tension and facilitates replacement, and a forced ventilation fan for better cooling. The control panel with star-delta start control is positioned for easy reading and operation. The opening front door allows for easy maintenance. *

Year of construction: 1991, condition: used, Technical details: Pressure capacity: 10 bar volume capacity: 5000 l/min motor capacity: 37 kW voltage: 380 V dimensions L x W x H: 0,9x0,7x1,5 m Equipment: - air cooling - suction opening = 500x400mm On sale as is, without test. Can be used as spare parts dispenser if necessary. Pgjdpfx Asu Nzx Esi Tou *

Condition: used, Year of construction: 2004, Technical details: feed pressure: 9,75 bar liter capacity: 10,1 l total power requirement: 5,5 kW volume capacity: 10,1 m³/min. Number of working hours: 26071 h revolutions per minute of the motor:: 3000 U/min. Pgsdpfxeu Szluo Ai Tou protection class: CE 0038 machine weight approx.: 310 kg dimensions L x W x H: 1,2 x 0,6 x 1,0 m Condensate separator installed. Restriction: Overload valve does not switch off automatically. For sale as is. *

Condition: used, Year of construction: 2017, operating hours: 13,310 h, 2017 | Atlas Copco XATS 900E | Used Air Compressor | 13310 hours 📍Location: Germany 🚛 Delivery available to your destination – Use our shipping calculator to estimate transport costs! 💰 Buy Now for EUR 25000 or Make an Offer. Payment at delivery available for an affordable fee (subject to approval)* 👷‍♂️ Inspected by an independent expert Podpfey Azn Usx Ai Tegu 15 inspection points 15 approved ✅ 0 imperfect ℹ️ 0 issues ⚠️ 📌 Inspector's Comment: Good operating 400v compressor , condence came out when first start no further issues 📄 Want to see the full inspection, extra photos, or a video? Tip: The reference "40511 Equippo" is commonly used when looking up more details online. 💡 Why this machine and our service stands out: ✔ Thorough inspection by professionals ✔ Jobsite delivery available ✔ Money-Back Guaranteed ✔ Secure and flexible payment options 🔄 Considering other equipment options? We offer helpful tools and resources for all equipment owners and operators – easily accessible on our platform.

Condition: used, Weiss Technik Salt spray chamber / corrosion test cabinet Weiss Technik SaltEvent SC 1000 Corrosion test equipment / salt spray test chamber For sale is a used Weiss Technik SaltEvent SC 1000 salt spray chamber. The device is suitable for corrosion tests, salt spray tests, material testing, surface testing, quality assurance, as well as research and development. Technical data Manufacturer: Weiss Technik GmbH Type: SaltEvent SC 1000 Pgjdpfozg Er Aox Ai Teu Device type: Salt spray chamber / corrosion test equipment Year of manufacture: 2019 Test chamber size: Size 1000 liters Rated voltage: 1/N/PE AC 230 V ±10 % / 50 Hz Rated power: 2.6 kW Rated current: 11.3 A Customer-side fuse: 16 A slow-blow Weight: approx. 370 kg Overall dimensions according to layout drawing: approx. 2910 × 900 × 960 mm Max. test chamber load: 150 kg Floor grid load: 150 kg Insertion rods: 8 kg per rod Shelf for machine part covers: 5 kg Temperature range salt spray test: Ambient temperature +5 K to +50 °C Temperature range condensation test: Ambient temperature +5 K to +42 °C Temperature compressed air humidifier: Ambient temperature +5 K to +70 °C Temperature stability over time: ±1 K Salt solution consumption during salt spray test: approx. 0.5 to 1.5 l/h Equipment S!MPAC control system WEBSeason / color control panel Touch operating panel Test chamber hood Storage tank Control cabinet Floor grid / test chamber grid Compressed air humidifier Hood locking Temperature monitoring Interface Documentation as shown in the pictures Connections / media supply Power connection: 230 V / 50 Hz Compressed air connection available Connection for demineralized water available Exhaust connection available Water drain / condensate drain available Application areas Salt spray test Corrosion test Condensation test Material testing Surface testing Coating testing Automotive Quality assurance Research and development Condition Used Optical condition as shown in the pictures. Scope of supply 1x Weiss Technik SaltEvent SC 1000 salt spray chamber Storage tank Accessories as shown in the pictures Documentation as shown in the pictures The table shown in the photos and any other items not explicitly mentioned are not included in the sale. Inspection possible by appointment. Loading with a forklift is available. Shipping or freight forwarding is possible. Subject to change, errors and prior sale. We will be happy to answer any further questions by telephone.

Condition: new, performance: 984 l/min main engine power: 7.5 kW tank capacity: 500 l maximum operating pressure: 10.0 atm Pgodpjzx Sr Hjfx Ai Tju integrated refrigerant dryer electronic adjustment of compressor operating parameters soundproofed cabin (only 67 dB) complies with CE standards manufactured in 2025, NEW

Condition: excellent (used), Year of construction: 2024, Manufacturer: BOGE Type: C 14 PMDR -350 Pjdpez Svtgofx Ai Tegu Year: 2024 Pressure: 13 bar Free air delivery: 1.74 m³/min Motor: 11 kW Controller: BOGE focus control 2.0 Voltage: 400 V / 50 Hz Dimensions (W x H x D): 1890 x 1824 x 854 Weight: 475 kg

Condition: like new (used), Year of construction: 2021, operating hours: 57 h, functionality: fully functional, machine/vehicle number: V002117/16, overall weight: 450 kg, power: 7.5 kW (10.20 HP), fuel type: electric, volume flow: 66 m³/h, operating pressure: 10 bar, pressure (min.): 0.5 bar, pressure (max.): 10 bar, type of cooling: air, Equipment: documentation/manual, refrigerant dryer, Hertz HBD 7 screw compressor, 7.5 kW – 10 bar – 57 operating hours – including refrigerated dryer Description: Hertz HBD 7 screw compressor – in like-new condition – only 57 operating hours. Psdpfszt Sriex Ai Tjgu For sale is a Hertz HBD 7 screw compressor system from 12/2021 with only 57 operating hours. The system has been operated very little and is in very good, like-new condition, both visually and technically. Technical data of the compressor: * Manufacturer: Hertz Kompressoren * Model: HBD 7 * Year of manufacture: 12/2021 * Operating hours: only 57 hours * Power: 7.5 kW * Max. pressure: 10 bar * Volume flow: 1.1 m³/min * Voltage: 400 V / 3 phases * Frequency: 50 Hz * Screw compressor, oil-cooled * Serial number: see nameplate Refrigerated dryer: * Model: Dryair DK 40 * Year of manufacture: 12/2021 * Max. pressure: 16 bar * Power: 0.37 kW * 230 V / 50 Hz * Refrigerant: R134a The system is mounted on a compressed air tank and is ready for immediate use as a complete unit. The photos show the actual system being offered. Price: €6,900 net, negotiable plus statutory VAT. Inspection and test run possible by arrangement. Collection preferred. Loading can be arranged by agreement.

Condition: ready for operation (used), Year of construction: 2016, functionality: fully functional, overall weight: 1,654 kg, Equipment: refrigerant dryer, type plate available, Atlas Copco air compressor, model: GA90VSDFF, oil-injected screw compressor with frequency converter (VSD), with dryer, pressure: 12.7 bar, air flow: 293.1 L/s, motor: 3508 rpm, year: 2016, weight: 1654 kg. Shipping throughout Europe not included, VAT not included. Reference: 1167 Pgedpfeyxpz Ujx Ai Tju

Condition: excellent (used), Year of construction: 2018, PROD. ATLASCOPCO TYPE GA45 FF S/N API585058 YEAR 2018 POWER (kW) 45 Pgsdo Aazttopfx Ai Tou CAPACITY (m3/min) 8.29 PRESSURE (bar) 7.25 HOURS (RUNNING/TOTAL) FREQUENCY CONVERTER no BUILT-IN DRYER yes, R410a 0.97kg HEAT EXCHANGER no COOLED BY (AIR/WATER) air ON TANK no CONNECTION 11/2 DOCUMENTS no

Condition: good (used), mileage: 911,051 km, first registration: 06/2016, fuel type: diesel, tire size: 385/65R22,5, axle configuration: 4x2, wheelbase: 3,700 mm, fuel: diesel, brakes: retarder, color: white, driver cabin: day cab, gearing type: automatic, number of gears: 12, emission class: euro6, suspension: steel-air, total length: 6,020 mm, total width: 2,550 mm, total height: 4,010 mm, Equipment: ABS, Bluetooth, air conditioning, central locking, cruise control, electric window regulation, navigation system, parking air conditioner, parking heater, power mirror, retarder, seat heater, tachograph, traction control, = Additional Options and Accessories = - Heated mirrors - Digital tachograph - Fixed - Halogen lamp - Compressor - Alloy wheels - Manual - Auxiliary drive - Radio/cassette - Lane keeping assist - Fabric - Topline - Auxiliary braking system = Notes = Podpfszwc D Dex Ai Tsgu Number of axles: 2, Configuration: 4x2, Tare weight: 9100 kg, Gross vehicle weight: 19000 kg, Total tank capacity: 700 liters, Saddle coupling height: 115 cm, Saddle coupling: Fixed, Number of locks: 1, Winch pulling capacity: 12 tons, Alloy wheels, Suspension type: Air suspension, Type of cabin: Topline, Cruise control, Tachograph (control unit), Digital tachograph, Air conditioning, Stationary air conditioning, Auxiliary heater, Electric windows, Electric mirrors, Radio/cassette, GPS navigation, Color: White, Heated mirrors, Type of lighting: Halogen lamp, Lane keeping assist, Air conditioning, Seat heating, Bluetooth, Engine displacement: 16353 cc, Fuel: Diesel, Euro: 6, Transmission type: Opti-cruise, Transmission type: Scania, Gears: 12, Auxiliary braking system, Retarder brand: Scania, Power steering, ABS, ASR, Compressor, Auxiliary drive, PTO type: 1, Central locking, Seat configuration: 1+1, Seat cover: Fabric, Seat adjustment: Manual, GHH silo compressor = Additional Information = Transmission Transmission: SCA, 12 gears, Automatic Axle Configuration Brakes: Disc brakes Axle 1: Tire size: 385/65R22.5; Steered; Tire tread depth left: 6 mm; Tire tread depth right: 8 mm; Suspension: Leaf spring suspension Axle 2: Tire size: 315/70R22.5; Dual tires; Tire tread depth left inner: 4 mm; Tire tread depth left outer: 5 mm; Tire tread depth right inner: 7 mm; Tire tread depth right outer: 8 mm; Suspension: Air suspension Weights Unladen weight: 9,100 kg Payload: 9,900 kg GVW: 19,000 kg Condition Technical condition: good Optical condition: good Damage: none Number of keys: 1 Identification License plate: KLEYN1 = Company Information = Kleyn Trucks is one of the world's largest independent dealers in used vehicles. Here you can choose from a constantly changing stock of 1200 used trucks, tractor units, and trailers. Our range includes all European brands from various years of manufacture and price ranges. Why buy from Kleyn Trucks? Simple! • Large and rapidly changing inventory • Recognizable quality • A good price • Proper business practices • We speak many languages • We understand our customers • Assistance with import and transport • (Export) registration is arranged quickly • Expert technical services • The security of "recognizable quality" • And more... Please visit our website for special offers and a complete inventory: Leasing through Kleyn Trucks is possible in most European countries! Calculate your leasing rate quickly and submit an inquiry via our website. Inquire directly about our European warranty package.

Condition: used, Year of construction: 2003, functionality: limited functionality, machine/vehicle number: AII 477031, overall weight: 1,500 kg, total length: 2,000 mm, total width: 980 mm, total height: 2,000 mm, volume flow: 522 m³/h, pressure (max.): 10 bar, Equipment: documentation/manual, type plate available, Pgjdpfx Aie Aayw Rs Tou

Condition: used, ALMiG Gear 132 Compressor, Screw Compressor, 10 bar The screw compressors in the GEAR series are particularly suitable for very high compressed air requirements. The maintenance-friendly and service-oriented drive concept of the GEAR compressors includes a robust drive motor with high power reserves. The highly efficient gearbox operates with minimal slippage, high operational reliability, and an efficiency of over 98%, resulting in almost loss-free operation and thus protecting the drive. Furthermore, the highly efficient coolant separation enables a minimal residual oil content of only 2–3 mg/m³. The encapsulated design of the gearbox assembly makes these systems ideal for use under the harshest operating conditions. - Ideal for very high compressed air demands - Robust drive unit with high power reserves - Almost loss-free concept with an efficiency of > 98% - Maintenance-friendly and service-oriented drive concept ALMiG Gear 132 Year of manufacture: 2011 Final pressure: 10 bar Motor power: 132 kW Volume flow: 18.04 m³/min Length: 2800 mm Width: 1400 mm Height: 2025 mm Weight: 3830 kg Operating hours: 10,337 h Load hours: 9,378 h Downtime: 13,887 h Total delivery volume: 11,333,000 m³ You can find more ALMiG compressors – new and used – in our shop! International shipping costs available upon request! Pgedpfxottv Ibs Ai Tsu