Mahr GmbH - Anlagentechnik für Schüttgüter
About us
Mahr GmbH is your partner for bulk materials technology
with the experience from more than 60 years of plant construction
Silos, silo systems and pneumatic conveyor systems, mechanical conveyor systems
including valves and components are manufactured.
From the planning to the handover of the turnkey system, we provide everything from one source
including but not limited to the following areas:
• Chemicals industry
• Lime, plaster
• Glass
• Paints
• Cement
• Stones, earth, clays
• Steelworks
• Fertilisers
• Foundries
• Power plants
Mahr means problem solutions according to the need. Innovation force, high quality and capability make us a strong partner in the bulk materials sector. Experts support our customers in the planning phase and are reliable companions during the planning and object development. Practically oriented innovations identify many Mahr valves for the optimisation of the material flow, operational reliability and environmental protection.
Products
Pneumatic conveyor system DFP/DFH
The pressure vessel has established itself for pneumatic conveying with high pressures (long conveying distances) and high product concentrations (high delivery rates). In the case of poorly flowing products, it is possible to increase the flowability using additional measures (cone venting, mechanical discharge aids). Depending on the conveyed material and conveying distance, gravity draining (connection of the delivery line underneath the discharge funnel) or cover emptying (connection of the delivery line from above vertically into the protruding pressure vessel riser pipe) and various ratios of the upper, lower and secondary air supply. The pressure vessel can be loaded either in free fall or using suitable mechanical feeders. The operation of a pressure vessel is always discontinuous; therefore a buffer container is arranged above the pressure vessel for continuously occurring material. If large delivery rates are required, two pressure vessels can be operated in parallel. While one is being filled, the other is emptying. An almost continuous delivery is achieved in this way. In every case, the supplied amount of material must not be larger than the capacity of the pressure vessel. The average availability of a single pressure vessel is 50% and that of a twin pressure vessel is approx. 90%. The achievable delivery rate of any pressure vessel is decisively determined by the net capacity of the pressure vessel and the diameter of the delivery line. However, due to the often very different bulk weights, grain sizes, grain distributions and other physical properties of the bulk materials, no specific specifications for known delivery line cross sections and pressure vessel capacities can be made in advance. Design of the MAHR pneumatic conveyor system: The conveyor system consists of the pressure vessel with the completely attached valves. It is ready for operation when connected to the compressed air supply and the electric controller.
Cast slide valve Type GFS
The cast iron slide valve Type GFS is used in silo and tank outlets. It guarantees optimum sealing when storing bulk materials containing dust or in granulate form. Mode of operation: The stainless steel slider plate on eccentric support pins in the cast iron case is sealed dust-tight on the bulk material side with Vulkollan sealing strips and with packing glands on the outside. Easy adjustment of the support pins and the packing glands achieves high operational reliability. The cast slide valve is available with pneumatic cylinder, toothed rack or manual operation. Material / design: Case: grey cast iron Bracket: galvanised steel Slider plate: stainless steel Sealing strips: Vulkollan Technical data: Pneumatic drive: P neumatic cylinder with non-contacting limit switches and 5/2 way solenoid valve Electric motor toothed rack drive: with integrated limit switches. 0.37 kW/400 V, 50 Hz Advantages: Robust and reliable Short closing times Easy to maintain Dust-tight
Fluid bed
Application area: The MAHR fluid bed is the discharge aid for poorly flowing but fluidisable dust and powder bulk materials. As a special design, this bed is also used for homogenisation. Material: Dished bottom: material St. 37 or 1.4301, 1.4541, or disk bottom: 1.4571 Decompaction cloth: plastic fabric (Aeropertex), sintered plastic or sintered metal (sintered bronze or VA) Seal: rubber or Teflon (for high operating temperatures) Design: A dished bottom or disk bottom is used as supporting part for the fluid bed. The bed is connected to the silo using a connection flange. The fluid be is covered over the entire surface with air-permeable Aeropertex fabric, through which the provided air or other gaseous medium (nitrogen, argon, etc.) is fed to the material to be ventilated via a connection nozzle in the ventilation bed. The fabric is also not permeable for finest-grained products. Aeropertex fabric is 100% polyester, does not absorb any moisture and is resistant to weak acids and alkalis. It is resistant to rotting and weathering, wear-resistant and compatible with continuous temperatures up to 160°C and 180 °C for short times. The fabric is self-cleaning due to the air flow. Depending on the size of the bed, the ventilated area is divided into one or more segments. Division and ventilation of the area in segments is particularly very important for homogenisation. Operation: Using an air source (factory network or compressor), dry and oil-free air or gas is fed to the air chamber of the bed via the ventilation nozzles. This air flows through the porous surface of the decompaction covering into the silage medium in the silo or pressure conveyor, fluidises this and makes it flowable. The material does not have the possibility to penetrate through the decompaction covering. The decompacted material flows through the discharge nozzle into the downstream units.
Modular slider TYPE MMFH-H
Application areas: The flat slide valve is used as emergency slide valve at silo and tank outlets to be able to perform maintenance work on downstream discharge elements without emptying the silo. It guarantees optimum sealing when storing bulk materials containing dust or in granulate form up to maximum 4 mm grain size. Mode of operation: The modularly designed slide valve enables the attachment of the various drive types, manual, pneumatic and electric motor drive, for the same base frame. The slider plate has sealed rollers on both sides. The welded plates arranged like a labyrinth and all-round triple packing glands ensure optimum sealing. The packing glands can be easily adjusted from the outside as required. Material: Sealing block: aluminium Packing box: grey cast iron Packing glands: PFTE-impregnated ramie fibres Slider plate: St 37, primed Advantages: optimum sealing hot-dip galvanised robust and reliable short closing times modular design
Pressure equalisation valve
Application area: According to VGB 112, pneumatically fillable silos and tanks must be fitted with overpressure / low pressure protection. The Mahr pressure equalisation valve is supplied in the nominal diameter DN 200. Design: The response pressure is adjusted using sliding weights. The low pressure can be set to between 5 and 13 mbar and the overpressure to max. 40 mbar. Option: The low-cost alternative is a DN 250 spring loaded overpressure / low pressure protection device
Shut-off valves
Application areas: The MAHR shut-off valves: Uncomplicated, robust components for many different operating conditions. Shut-off valve with one flange (F1): Everywhere where flexible connection is required. A rubber or cloth sleeve (or similar) connects to the downstream element. Typical example: Between silo and weigher, sieve machines etc. Shut-off valve with two flanges (F2): Everywhere where positive connection to the downstream element is necessary. Typical example: Between silo and screw, rotary feeder etc. Three actuation types can be selected for both base units: a. Electropneumatic drive b. Gear motor drive c. Manual operation Material / design: Valve body: die cast aluminium Valve disk: material grey cast iron with neoprene rubber coating Shaft journals: material, made of C 40, with self-lubricating plastic bushes which do not come into contact with the product F1: flange on one side + sleeve nozzle F2: flange on both sides a. Electropneumatic drive: EP 80 - EP 100 - EP 125 = piston diameter b. Gear motor drive: Gear motor: Size GM2: 0.55 kW Gear motor: Size GM2: 0.75 kW c. Manual operation: H2: Hand lever 300 mm long H3: Hand lever 500 mm long Technical data: Dust-tight: alternatively pressure-tight up to 0.2 bar Sealing ring: nitrile rubber (NBR black), temperature-resistant from -30 °C to +130 °C, not suitable for food Advantages: Physical: very resistant to oils, heat and ageing Mechanical: flexible, hardly deformable, very low gas permeability Chemical: resistant to mineral oils, hydrocarbonates, water, steam, gas and vegetable oils In the case of changing the operating process, it is possible at any time to change the shut-off valves to a different type of actuation
Silo overfill protection
Application area: The silo overfill protection is suitable for preventing overfilling for silos to be filled pneumatically. It consists of a pneumatic pinch valve with electric solenoid valve in the filling line and a switch box. For the function, a maximum fill level limit switch must be provided by the customer on the silo and compressed air (approx. 6 bar) free of oil and water must be constantly available. The switch box is connected to 380 V, 50 Hz power supply. Electrical wiring and compressed air supply must be provided by the customer. The system must be switched on before the filling. Blowing in is not possible without electrical voltage. Electrical equipment: The pinch valve is closed in the normal state. It must be released by pressing a button before starting the filling. The use of the system can be signalled remotely by local equipment such as indicator lamp or similar. A signal to be set up by the customer (horn or similar) is triggered if the fill level reaches the maximum sensor. The delivery must be stopped immediately. The signal can be switched off at the switch box. After a specified (configurable) time, the pinch valve then closes automatically whereby any further filling of the silo is prevented. If the pinch valve has closed for full delivery, it can be opened again using a key switch by responsible operating personnel to flush out the fill tube with air to clear residue material. The valve must be closed again afterwards (Attention! The protection is not effective during actuation using the key switch!). A magnetic switch is attached to the fill tube coupling. The vibration motor of the silo ventilation filter is switched on by a pulse for 10 - 20 seconds when the blank coupling populated with magnets is removed. The vibration process repeats after completion of the filling when attaching the blank coupling. A version without automatic filter vibration is also optionally available. At high air injection pressure due to the final sloshing or in the case of soiled filter elements, overpressure in the silo can occur which exceeds the setting value of the overpressure valve. A pressure switch can be installed in the silo roof to prevent this risk. If the setpoint pressure is exceeded, the pinch valve closes automatically, the filter is cleaned and then the pinch valve opens again and the filling process can be continued until the maximum sensor is tripped.
Decompaction box
Application area: The decompaction box is mainly installed in silo cones. It prevents bridge formation and promotes the flowing out of the product. The application area is primarily fine powder bulk materials. Material: Polyester • ST 37 Design: The unit consists of diverse decompaction nozzles which are arranged in a specific way depending on the specified conditions. Every decompaction installation is connected to a ring line and can easily be divided into various ventilation fields. Electrical equipment: A 2/2 way solenoid valve with the required protection type and voltage is used as ventilation valve. Operating data: Ventilation pressure: 2000 - 8000 mm WS Air flow rates: 0.45 Nm3/min. per decompaction box Temperature stability: max. 140 °C Special features: Using the decompaction box, emptying of the ventilated silo without residues can normally be guaranteed. Low wear - no protruding parts in silo cone Easy installation without entry into the silo and subsequent installation is possible.
Pinch Valve TYPE SQV
Application area The MAHR Pinch Valve TYPE SQV is used as a safety element for the pneumatic filling of silos. Installed in the filling line, it releases the complete pipe cross section during the filling. The thick rubber wall of the diaphragms results in long service lives. The solenoid valve directly attached to the SQV enables short closing and opening times. Mode of operation: During the pneumatic filling, the bulk material is blown through the filling line into the silo using compressed air. The free pipe cross section guarantees high delivery rates and low wear. In the case of a fault, tripping of any safety element, controller failure etc., the SQV is closed from the outside by pressurisation of the diaphragms. The diaphragm in the spherical part of the case is pressurised from the outside with compressed air at least 2 bar higher than the delivery pressure and thus compressed to complete closing. Due to the directly attached solenoid valve, the control air can flow in quickly and reliably close the diaphragms. Material / design: Case: grey cast iron, aluminium Diaphragms: Rubber Control air connection: G 1/4 inch Technical data: Operating pressure: 4 bar Control pressure: approx. 1.8-2.0 bar higher than the respective operating pressure, max. 6 bar Connection flange: DIN 2576, PN 10 alternatively inner thread 3" or 4" Advantages: operationally reliable economic low wear short closing times
Decompaction nozzle DN 80
Application area: The MAHR decompaction nozzle is mainly used in smaller containers for fluidisation of powdery bulk materials. Bulk materials such as cement only need little fluidisation air so that the nozzles in this case are also intended for larger silos. Material: Case: grey cast iron Lining: Aeropertex fabric or sintered metal. Design: A complete fluidisation system consists of several decompaction nozzles which are arranged in a specific way depending on the specified conditions. Every decompaction installation is connected to a ring line and can easily be divided into various ventilation fields. Electrical equipment: A 2/2 way solenoid valve with the required protection type and voltage is used as ventilation valve. Operating data: Ventilation pressure: 2000-8000 mm WS Air flow rates: 0.01 Nm3/ min per nozzle Temperature stability: max. 140 °C.
Silo Feeding Nozzle SE
Application areas: The MAHR Silo Feeding Nozzle SE is used everywhere where delivery lines must be connected to silo bodies. The gas/dust mixture is deflected at right angles by it and introduced into the tank. Material: grey cast iron, die cast aluminium, cast steel, cast stainless steel Special features: Connecting delivery lines to silos is made easy when using this inlet nozzle. Pipeline bends with large radii are saved. The form causes a reduction of the incoming flow speed and thus low wear
Tube loosening
Application area: The tube loosening is mainly installed in silo cones. It prevents bridge formation and promotes the flowing out of the product. It is only suitable for use with poorly flowing dust-like products. Gritty and grainy products usually discharge without special measures. Material: Fabric tubes: polyester Linings and discharge pieces: ST 37, grey cast iron or material 1 4541 Design: The unit consists of diverse loosening tubes which are arranged in a specific way depending on the specified conditions. The compression of the fabric tube is prevented by a spiral installation and almost round cross section. Every decompaction installation is connected to a ring line and can easily be divided into various ventilation fields. Electrical equipment: A 2/2 way solenoid valve with the required protection type and voltage is used as ventilation valve. Operating data: Ventilation pressure: 2,000 - 8,000 mm WS Air flow rates: dependent on number and length of the tubes Temperature stability: max. 140 °C Standard lengths: 0.5 m, 1 m, 1.5 m, 2 m, 2.5 m Special features: Using the decompaction box, emptying of the ventilated silo without residues can normally be guaranteed. The advantage as compared with other discharge equipment is that no moving parts have to be installed. Air is blown via the porous fabric into the fill material to fluidise this and destroy bridges.
Telescopic loading device TV
Application area: The telescopic loading device is used for transshipment of dust-like and granulate bulk materials from silos into road tanker vehicles and railway tank cars. Loading open vehicles and containers is possible using a special design. The transshipment of the products is free of dust if the device is connected to a filter system with 15 - 20 mbar vacuum pressure. Design: The telescopic loading device basically consists of the upper part with pulley and ventilation nozzles, the flow shaft attached with chains and the lower part. If required, a fill level limit switch which prevents overfilling can be installed in the closing cone. A manual or motor-driven winch is used for raising and lowering the device. The motor-driven winch is fitted with a special device which causes automatic retraction of the extended telescopic loading device if the vehicle sets in its springs due to the load of the filling. Depending on the application area, the telescopic loading device can be made of normal steel or stainless steel. Any combination of polyamide cones is possible. The bellows is supplied made of a special fabric depending on the intended use. Throughput: For size DN 200/88: approx. 100 m3/h For size DN 300/88: approx. 150 m3/h. The throughput depends on the bulk material, the silo and the discharge aid.
Pressure tank
Application area: Pressure vessel for high pressure conveying. Material: Boiler plate: stainless steel Every design with the corresponding factory acceptance certificate. Calculation: according to AD and/or EU regulations Design: The boiler consists of the dished bottom, the cylindrical jacket and the cone with the taper angle of 60°. Every tank has a manhole and all spouts for the necessary valves. The position of the spots is variable. The spout position depends on the local conditions. Operating data: Acceptance is performed by TÜV or in-house motoring of the appropriate companies.
Air conveyor trough
Application area: The air conveyor trough is used for the horizontal transport of dust-like materials. Grainy products cannot be transported on it. Depending on type of product and delivery rate, the trough must be installed with an inclination of 5° - 7°. Material: Trough case: St 1203, AIMg 3 or material 1.4541 and 1.4571 Loosening plate: plastic fabric, sintered plastic or sintered metal (tin bronze or VA) Seal: Rubber Design: The air conveyor trough consists of upper and lower boxes which are separated by the porous loosening plate. The loosening air is blown into the lower box while the product to be conveyed is brought to flowing in the upper box as a result. Both boxes are firmly bolted to each other and sealed against each other. The troughs are manufactured in lengths of maximum 2,500 mm and can be bolted together into any lengths. Appropriate inlet and outlet connectors for this are also supplied. A standard fan is usually used as air source which is firmly mounted onto the air slide. Each trough part has a hand hole according to the drawing. Electrical equipment: A special motor on a rocker is used as drive motor for the ventilation fan. Protection type and voltage are according to customer requirement. Operating data: Air quantity / m2: dependent on the trough inclination and porous medium Air pressure: dependent on porous medium Special features: When using this conveying trough, gentle conveying of powder material can be guaranteed. There is only low wear as, in contrast to mechanical conveying equipment, e.g. screw conveyors, no rotating parts are used. The loosening plate has a long service life and can be frequently regenerated after soiling. The hand holes enable checking the conveying and to perform mechanical cleaning without removal of the trough. Any number of inlets and outlets can be attached to the trough. Conveying distances do not play any role if sufficient height for installing the trough is available.
Two-way tube switch ZR
Application area: The tube switch is mainly used in delivery lines of high pressure systems; however it can also be used in the low pressure range at any time. It is suitable for the transport of dry, non-adhesive or tending to cake dusts and is used for changing the direction of the delivery flow. Material: Case: grey cast iron or cast stainless steel Shut-off cone: grey cast iron or cast stainless steel Seal: rubber, silicone, Viton Design: The tube switch consists of the tube switch case, the swivel arm with the shut-off cone and the pneumatic swivel drive. The closed outlet is sealed with a sealing ring which is pressed against a hardened ring. Electrical equipment: The tube switch has a limit switch (normally closed contact and normally open contact) in each end position at free choice for standard signalling. A Herion 5/2 way solenoid valve is usually used as control valve (other makes of control valve on request). The electrical equipment is supplied in any protection type and any common voltage according to requirement. Operating data: control pressure: approx. 5 bar operating pressure: max. 10 bar Special features: The tube switch guarantees faultless sealing of the stopped delivery stream so that material mixtures in the case of conveying different materials via one system are ruled out. The advantage of this design is that the sealing rings can be replaced without dismantling and shortest standstill times. A different switch design must be selected for the conveyance of adhesive and caking materials. The tube switch can of course also be supplied with electric motor drive and with manual actuation.
Cone closure KVP
Application area: The MAHR cone closure makes pressure-tight seals of material filling openings. The main application area is the sealing of high pressure discharge vessels in high pressure conveying systems. Material: Case: grey cast iron, cast stainless steel Flange: steel, 1.4301, 1.4571 Sealing cone: grey cast iron, cast stainless steel Sealing ring: groove ring made of Hydrofit, Teflon, Viton Design: The cone closure consists of the case with sealing cone and the drive. The joined parts are sealed in each case with O-rings. The sealing cone is opened and closed using a lever design and a pneumatic cylinder. The seal is made by pressing the cone against the groove ring inserted in a steel ring. Electropneumatic equipment: The pneumatic drive is equipped with a 5/2 way solenoid valve. The cone closure has a limit switch in each end position for standard signalling. Operating data: control pressure: min. 3.5 bar operating pressure: max. 16 bar Special features: Absolute leak tightness as the tank interior pressure supports the seal due to the design. Low wear as the sealing ring does not come into contact with the material flow.
Special tube valve SPP
Application area: The MAHR special tube valve SP P is used in high pressure conveying systems as closing element for delivery lines. It is mainly installed at the outlet of the delivery line from the pressure conveyor. Material: Case: grey cast iron, cast aluminium Tube: rubber in various qualities and colours, depending on requirement and application area. Design: The special tube valve SP P consists of the case, the scissor part and the drive. The elastic tube insert is compressed evenly using a scissor system. The clamping scissor is actuated using a pneumatic cylinder to which the control air is supplied via a 5/2 way solenoid valve. Electrical equipment: The valve has a limit switch (normally closed contact and normally open contact) in each end position. A Herion 5/2 way solenoid valve is usually used as control valve (other makes of control valve on request). The electrical equipment is supplied in any protection type and any common voltage according to requirement. Special features: The complete tube cross section in the valve is enabled in the open position. No disruptive components are present; therefore only low abrasion and low pressure losses. The advantage of the design is that the tube is the only wear part and this can be replaced quickly. A further advantage is that leak tightness is already reached at equalisation of control and operating pressure and a separate control air network can be saved. The valve is closed in the event of power failure.
Additional nozzle ZD
Application area The MAHR Additional Nozzle ZD is installed in delivery lines of high pressure conveying systems and in fact mainly after the special tube valve SP. Carrier gas is also fed into the delivery line using this. The dust / gas mixture is varied by changing the nozzle insert. Material: Case: grey cast iron, cast aluminium, cast stainless steel Nozzle: grey cast iron, cast stainless steel Design: The Additional Nozzle ZD consists of the nozzle case and the nozzle insert. Depending on requirement, the insert can be drilled out up to a specified diameter. Special features: Due to the tangential arrangement of the air connection, the air inlet is largely vortex-free.
Mahr Bow 2000
The MAHR BOW 2000 is used for low-wear is used for low-wear direction change of pneumatic delivery flows. As the delivery flow is forced to the inner radius of the bow, the wear which would otherwise be produced at the bow inner wall is relocated to the material buffer zone which forms during the filling. The distinctive shape of the MAHR BOW 2000 changes the otherwise well-known wear at these critical places. A support buffer forms in the bow immediately after starting the filling which prevents wear on the bow itself and enables long service lives so that the conveyed material is not conveyed on the bow itself but along the support buffer. Clear advantages of the MAHR BOW 2000: Low-wear delivery flow direction change due to own bulk material cushion Low pressure loss Compact design Low purchase and installation costs Low resistance to bends with larger radius
Diverter pot
The diverter pot is used for changing direction of pneumatic delivery flows in pipelines. The diversion angle can be continuously varied from 45° - 135°. The basic version does not have an additional antiwear plate. A manganese plate can optionally be welded on. For the diversion of very abrasive bulk materials, it is recommended to select the diverter pot with replaceable antiwear plate.
Rotary feeder TYPE SZR, N, UL
Application areas: The MAHR rotary feeders are used for metered discharges of powder bulk materials from silos or containers. Robust cast iron case, cell wheels made of steel or stainless steel, guaranteed quiet running and high operational reliability. Flanged gear motors connected directly via a coupling or using a chain reduction unit are available as drive. Different transmission speeds, variable chain reductions, manually adjustable control gearing or frequency-controlled motors enable fine tuning of the discharge performance. Rotary feeders of the TYPE SZR are suitable for discharge flow rates up to 36 m3/h. Discharge rates to more than 300 m3/h are made possible with the type series N and UL. Design: Cell wheels with 8-10 cells dose the bulk materials; the dosing quantity is determined using the speed of the gear motor. Any change of the dosing quantity can be made using chain wheel alteration, manual control gearing or frequency-controlled motors. Bulk material can be optimally blown out pneumatically in the low pressure range using the blow-out shoe and the leakage air discharge. Material / design: Rotary feeders of the TYPE SZR: with cast iron case and cell wheels for small to medium discharge quantities made of steel or stainless steel. Rotary feeders of the TYPES N + UL: are internally hard chromium plated, with polished cast iron cases and cell wheels made of steel or stainless steel and inclined cells. Sizes 200/620 and 300/650 as heavy-duty welded construction. Silver grey hammer tone paintwork; other painting on request. Technical data: Rotary feeders with motor arrangement above chain wheels enable a short design. Speed monitoring and large-dimensioned motors with temperature monitoring using thermistors guarantee operational reliability. Advantages: permanently lubricated ball bearings quiet running due to inclined cells wear protection due to hard chromium plating
Rotary feeder Type A
Application area: The MAHR rotary feeder is used for volumetric dosing of bulk materials. Different cell wheels, combined with speed adjustment, enable fine tuning of the throughput performance. Material: Case + bearing cover: grey cast iron or cast stainless steel Cell wheel: steel or stainless steel partially with Vulkollan sealing strips Special features: The cell wheel has generously dimensioned, permanently lubricated roller bearings which are sealed using radial sealing rings. The enclosed design of the cell wheel and the high precision fitting of the case to the cell wheel guarantee good leak tightness.
Screw conveyor
MAHR supplies tube and trough screw conveyors. Standard version: carbon steel St 37-2 as transport, dosing, paddle or mixing screw conveyors with full blade, spiral or paddle blades sealing of the shaft openings using radial shaft seals outside flange bearing drive via gear motor in foot-mounted version force transmission via elastic claw coupling Options: stainless steel, e.g. 1.4301/1.4541/1.4571 highly wear-resistant materials, e.g. HARDOX temperature-resistant materials, e.g. 15 Mo 3 waterproof version outside pedestal bearings sealing of the shaft openings using packing glands drive via gear motor in plug-in form force transmission via chain drive centre bearing Special designs: cooling screw conveyor
Screw weigh feeder
Application areas: ##Measurement of continuous mass flows ##Weight-controlled filling of tanks, containers and similar Weighing product: All well flowing materials such as cement, rock powder, quartz sand, cereals, granulates. Accuracies: Between 0.1% and 1% depending on type and material feeding. Outputs: 200 kg/h to 40 t/h depending on screw size. Advantages: ##Small installation dimensions ##Universal application ##Can be retrofitted in existing systems Mode of operation: In the infeed area, the screw is pivoted horizontally transverse to the conveying direction. A force measuring device in the form of a measuring cell for weight measurement is generally installed in the area of the discharge. The product to be weighed is weighed during the transport from the infeed to the discharge. The accuracy of the screw weigh feeder basically depends on the filling level of the screw. Therefore there is an upstream dosing device (e.g. screw, rotary feeder, vibrating trough) before the screw weigh feeder.