Alternating current. Abbreviation in the type designations of our pumps (e.g. "SP 720 EC-DV (AC)") for pump types with AC motor. See → AC motor
An AC motor is an electric motor that is operated on alternating current. Our eccentric diaphragm pumps can be equipped with shaded-pole motors for operation on alternating current. Our electromagnetically driven pumps (linear pumps, vibrating armature pumps, pivot pumps) are usually operated on alternating current.
Abbreviation in the type designations of our pumps (e.g. "SP 110 EC-BL") for pump types with brushless motor. See → Brushless pump
Brushless motor, see → Brushless pump
see → Brushless pump
Pumps with a brushless drive ("brushless motor, BL motor, BLDC motor") offer a particularly long life expectancy. A brushless motor is an electric motor without carbon brushes (sliding contacts). In conventional brushed motors, the carbon brushes are used for the electrical connection between rotor and stator via slip rings or commutators. These brushes are subject to wear due to mechanical abrasion and brush fire. With the brushless electric motor, there are no commutators or brushes. A BL motor has a higher efficiency due to its low friction and a longer service life due to the lower wear.
We offer you our brushless pumps for gases and liquids with a variety of different BL motors: different voltages, analogue or PWM control, with or without integrated electronics and with or without control input or frequency output. We would be happy to advise you on choosing the right BL motor for your brushless pump!
Our pumps can be equipped with cables, plugs (or sockets) and mounting options according to customer requirements in order to integrate them quickly and easily into the respective peripherals. In addition, numerous customizing options are available to our customers in order to precisely adapt the performance data of the pump and the chemical properties of the materials used to the specific application.
In order to be able to transport aggressive gases, acids and alkalis reliably, all wetted parts of the pump must be chemical-resistant. Our modular system offers you a variety of different plastics and elastomers to adapt your pump to the desired chemical requirements.
Electrical and pneumatic (or hydraulic) connections are required to operate the pump. On request, we can supply your pump with ready-made connection cables and plugs or with unassembled solder lugs. In addition, we can provide the pumps with various tubing connections (e.g. barbed fittings, internal threads for screwed hoses, manifold connections with O-ring seals).
All parameters of our pumps can be precisely adapted to specific customer requirements. This concerns both the desired pneumatic or hydraulic performance of the pump (flow rate, pressure, vacuum, suction height) and the choice of suitable materials (chemical and physical properties of plastics and elastomers). In addition, we provide you with a variety of different motors, tubing connections, cable assemblies and accessories. Thanks to our modular system, we can implement customer requests within a few days - without additional development-related costs!
Direct current. Abbreviation in the type designations of our pumps (e.g. "SP 725 EC-DV (DC)") for pump types with DC motor. See → DC-Motor
A DC motor is an electric motor that is operated with direct current. Iron-core motors, high-quality coreless motors and particularly durable brushless motors are available for Schwarzer Precision pumps. Our vane pumps and rotary diaphragm pumps as well as most of our eccentric diaphragm pumps are driven by DC motors. Alternatively, our eccentric diaphragm pumps can also be equipped with AC shaded-pole motors and thus operated on AC voltage.
The specified dimensions of our pumps (length, width, height) refer to the maximum housing dimensions including motor and connectors. Any tubes, connection cables and pump accessories (suction filters, non-return valves, pressure switches, etc.) that may be present are not included in the specified dimensions.
The drive converts the electrical control of the pump into a mechanical movement to convey the medium. We supply our eccentric diaphragm pumps with iron core motors, coreless motors, brushless (BLDC) motors or AC shaded pole motors. Our vane pumps are equipped with coreless motors, the rotary diaphragm pumps are driven by iron core motors. In addition, we manufacture various types of pumps with non-rotating electromagnetic drives (linear pumps, vibrating armature pumps, pivot pumps).
Pump with two pump heads that are driven together by one end of the motor shaft (type designation "-DU"). The two pump heads are at a 180° angle to each other so that the pumped medium (gas or liquid) is sucked in or expelled alternately. Dual-headed pumps can be configured → in series or → in parallel.
Dual Head parallel
Two-headed pump with parallel configured tubing (type designation "-DUp"). The parallel tubing adds the flow ("volume flow") of both pump heads, resulting in a particularly high delivery volume.
Dual Head serial
Two-headed pump with serial configured tubing (type designation "-DUs"). The serial tubing combines the pressures (or vacuum) generated by both pump heads, resulting in a particularly high total pressure (or vacuum).
Abbreviation in the type designations of our pumps (e.g. "SP 620 EC-DUp-DV") for two-head diaphragm pumps with parallel tubing. See → Dual head parallel
Abbreviation in the type designations of our pumps (e.g. "SP 620 EC-DUs-DV") for two-head diaphragm pumps with serial tubing. See → Dual head serial
Abbreviation in the type designations of our pumps (e.g. "SP 620 EC-DV") for pumps that are primarily designed for pressure delivery. See → Pressure delivery
Abbreviation in the type designations of our pumps (e.g. "SP 100 EC"). The abbreviation designates our → Eccentric diaphragm pumps (eccentric pumps) for air and gases.
Abbreviation in the type designations of our pumps (e.g. "SP 570 EC-L"). The abbreviation designates our → eccentric diaphragm pumps (eccentric pumps) for liquids.
The eccentric mounted on the motor shaft is used to convert the rotary motion of the electric motor into an oscillating up and down motion of the connecting rod. The desired stroke of the diaphragm movement is realized by the size of the eccentric.
Eccentric diaphragm pump
Motor-driven pump that cyclically moves a diaphragm up and down using an eccentric and connecting rod. The diaphragm moving downwards creates a negative pressure, which sucks the pumped medium into the pump chamber via an inlet valve. As soon as the diaphragm moves upwards again, the pumped medium is pressurized. The inlet valve is closed by the resulting overpressure, at the same time the outlet valve is opened and the pumped medium flows out. Eccentric diaphragm pumps from Schwarzer Precision are particularly robust and reliable, gas-tight, maintenance-free and outstandingly controllable.
→ Overview of our eccentric diaphragm pumps for gas delivery
→ Overview of our eccentric diaphragm pumps for liquid delivery
see → Eccentric diaphragm pump
The charging time of a lead-acid battery can be significantly reduced by circulating the electrolyte. For this purpose, air is blown into the electrolyte liquid of the battery with a pump. This circulation prevents crystal formation during the charging process, which means that higher charging currents and shorter charging times can be achieved. Our vibrating armature diaphragm pumps ("SA-EUW") are specially optimized for electrolyte circulation in battery chargers.
→ Product page SP 203 SA-EUW - Single Pump (vibrating armature diaphragm pump for electrolyte circulation)
→ Product page SP 203 SA-EUW - Twin Pump (vibrating armature diaphragm pump for electrolyte circulation)
Pumps with an electromagnetic drive are usually operated on AC voltage. The drive consists of an iron core coil and a magnetic armature. The current-carrying coil generates an alternating magnetic field that causes the armature to oscillate. The armature drives a pump head that pumps the medium by a membrane and two valves (inlet / outlet). Pumps with an electromagnetic drive are particularly wear-resistant because they have no mechanical bearings. With upstream electronics ("inverter"), these pumps can also be operated with DC voltage.
We supply you with three different pump designs with electromagnetic drive: → Linear diaphragm pumps (linear pumps), → Pivot diaphragm pumps (pivot pumps) and → Vibrating diaphragm pumps (vibrating armature pumps).
EPDM (ethylene propylene diene monomer) is an elastomeric material that is typically used in our pumps as the standard material for valves, seals and diaphragms. EPDM is excellent for use with non-aggressive gases and liquids.
Abbreviation in the type designations of our pumps (e.g. "SP 203 SA-EUW") for pump types that are particularly suitable for → electrolyte circulation in battery chargers.
Fast closing valves
Complex demands are placed on the valves of a diaphragm pump. They must react very quickly and at the same time reliably seal the valve seat so that the pump can achieve its maximum efficiency. The FCV technology ("fast closing valves") developed by Schwarzer Precision works with clamped valve plates, which are fixed to the valve seat with holding arms and under slight pre-tension. Compared to conventional (free swinging) flapper valves, our FCV valves react much faster and seal more reliably. In addition, they are less sensitive to impurities in the pumped medium.
Pump with particularly fast-closing valves, see → Fast closing valves
FFKM ("perfluorocarbon rubber, perfluoroelastomer") is a highly chemically resistant elastomer material used at Schwarzer Precision for valves, seals and diaphragms in our pumps. It is mainly used when a particularly high thermal and chemical resistance is required, which can no longer be met by FKM.
FKM ("fluorocarbon rubber") is a highly chemically resistant elastomer material used by Schwarzer Precision for valves, seals and diaphragms of our pumps. It is characterised by very good chemical and thermal resistance and is also very resistant to ageing. Thus, for example, applications in the chemical industry with process temperatures of over 140 °C and aggressive media can be safeguarded, where materials such as EPDM no longer meet the high requirements.
The flow ("delivery rate, pumping rate, volume displacement, volume flow") of a pump describes the delivered volume per unit of time (e.g. 100 ml/min or 1 l/h).
Abbreviation in the type designations of our pumps (e.g. "SP 125 FZ"). The abbreviation designates our → Vane pumps (rotary vane pumps) for air and gases.
In terms of its properties, a gas pump is specially designed for pumping compressible gases. Our gas pumps have particularly sensitive valves that respond very quickly on the one hand and close absolutely reliably on the other (see → Fast closing valves). On request, we can build gas pumps for you from chemically resistant materials. This means that the pumps can also be used to pump particularly aggressive and hot gases (e.g. in gas analysis or process engineering).
Click here for an → overview of our gas pumps.
The pump housing serves as a casing for mechanical protection against accidental contact and for electrical insulation. Our housings are made of durable, high-quality plastic (e.g. PPS). Individually selectable options are available for fastening the pump in the customer device (e.g. screw fastening, clamp fastening, manifold connection, etc.).
Abbreviation in the type designations of our pumps (e.g. "SP 3300 LI-D"). The abbreviation designates our → linear diaphragm pumps (linear pumps) for air and gases.
Linear diaphragm pump
In a linear diaphragm pump ("linear pump"), a coil through which alternating current flows, uniformly ("linearly") moves a magnetic armature back and forth. The armature in turn drives a diaphragm, which in turn cyclically increases and decreases a volume in the → pump head. The pumped medium is sucked in or expelled via valves. Our linear pumps are characterised by a high flow rate and a particularly long service life. They are typically used in battery chargers or for vacuum and compressed air supply. Our linear pumps are only designed for pumping gases.
Click here for the → overview of our linear diaphragm pumps
see → Linear diaphragm pump
In terms of its properties, a liquid pump is specially designed for pumping liquids. Unlike air and other gases, liquids cannot be compressed. Therefore, significantly higher mechanical loads occur in liquid pumps than in gas pumps. For this purpose, liquid pumps from Schwarzer Precision have a particularly robust design (e.g. motor bearings, connecting rods, etc.). The valve technology must also be specially designed for pumping liquids so that, for example, sticking of the valves due to adhesive forces is reliably avoided. On request, we can build liquid pumps for you from chemically resistant materials. This means that the pumps can also be used for pumping aggressive liquids (e.g. alkalis, acids, etc.).
Click here for an → Overview of our liquid pumps.
All pumps from Schwarzer Precision are designed for the respective application so that their service life generally corresponds to that of the end device. During this defined service life, our pumps operate completely maintenance-free.
A manifold connection enables the particularly space-saving, hose-free integration of the pump into a compact overall system. The pump is not, as is usually the case, integrated into its periphery with hose olives and hoses attached to them. Instead, the → pump head has nozzleless inlets and outlets that are mounted directly on the delivery channels of the application.
The medium ("pumping medium") is the gas or liquid transported by the pump. Since the various pumped media can have very different physical and chemical properties, we optimise each pump for the specific application. In addition to standard applications (e.g. pumping air or water), we can also adapt our pumps, for example, to pump particularly aggressive or hot gases, liquid or gaseous acids and alkalis as well as gas/liquid mixtures (condensates). Thanks to our modular system, this individual adaptation of the pumps is carried out without additional development-related costs.
Adaptation of our pumps to specific customer requirements, see → Customising
Vacuum therapy (NPWT / Negative Pressure Wound Therapy) is a therapeutic procedure in medical technology for the treatment of acute and chronic wounds. Specially adapted NPWT pumps from Schwarzer Precision ensure fast and comfortable wound healing.
→ read more
Depending on the desired application, our pumps can be connected to a wide variety of operating voltages. We can supply you with motors in all common DC and AC voltages.
Abbreviation in the type designations of our pumps (e.g. "SP 950 PA-D"). The abbreviation designates our → pivot diaphragm pumps (pivot pumps) for air and gases.
When configuring a two-headed pump in parallel, the two pump head outlets are merged into one common outlet via hose connectors. This way, the flow rates of both pump heads add up to a total flow rate of the pump. Parallel tubing offers yet another advantage. Since the two pump heads are actuated alternately, the individual pump pulses overlap at the output. This significantly reduces the → pulsation of the pumped medium. We offer two-headed pumps with parallel tubing under the type designations "DUp" (→ Dual Head parallel) and "THp" (→ Twin Head parallel).
Pivot diaphragm pump
A pivot diaphragm pump ("pivot pump") is an electromagnetically driven double diaphragm pump that is operated on AC voltage. The drive consists of an iron core coil and a magnetic armature which is mounted in a pivot. The current-carrying coil generates an alternating magnetic field that causes the armature to oscillate. The two ends of the armature drive two diaphragms, each of which transports the medium via two valves (inlet / outlet). Pivot diaphragm pumps are highly efficient and durable. They are typically used in battery chargers and for stationary gas monitoring. Our pivot pumps are designed for pumping gases only.
Click here for the → overview of our pivot diaphragm pumps
Plain bearings (also called "friction bearings, sleeve bearings, slide bearings, bush bearings") are made of particularly low-friction plastics or sintered bronze. They are compact and inexpensive. Plain bearings are primarily used for short running times. For use with long running times and/or high loads, we equip our pumps with ball bearings.
On customer request our pumps can be assembled with different plugs. The plugs are primarily used to supply power the pump. Pumps with brushless motors may also have connections for data lines on the plugs (e.g. sensor output, control input, etc.).
Positional independence means that the pumps can be installed in any spatial orientation in the respective application and always reliably achieve their specified performance values. Pumps from Schwarzer Precision can generally be installed and operated in any position.
The pressure generated on the outlet side of our pumps is specified relative to the ambient pressure (pump at rest = 0 mbar pressure).
Pumps for pressure delivery are mainly designed to achieve a certain positive pressure (given in bar for gases or in mH2O for liquids). These pumps are optimised for loads on the pump outlet side ("pressure-optimised pump"). Depending on the required application, our pumps can be optimised for pressure applications (type designation "-DV") or vacuum applications (type designation "-VD"). You can use our → Product Finder to search specifically for pumps suitable for pressure delivery.
A pressure switch ("pressurized switch, threshold switch") combines the functions of a sensor and a switch. The electrical switching process is triggered as soon as the pressure level measured by the sensor at the pump outlet exceeds or falls below a certain limit value ("threshold value"). The switch can be designed as an opener, closer or switch ("changeover").
In principle, every diaphragm pump generates a continuous sequence of individual pump pulses. Pulsation is the term used to describe the pressure fluctuations in the pumped medium caused by these cyclical diaphragm movements. By optimising the delivery channels in the pump head, our diaphragm pumps are designed for low pulsation. In special applications where even lower pulsation is required (e.g. in applications with highly sensitive pressure sensors), our two-headed pumps are ideal. The two alternately actuated pump heads generate superimposed pump pulses that add up to a particularly low-pulsation total flow. Another alternative is the use of our almost pulsation-free → vane pumps or → rotary diaphragm pumps (rolling pumps).
A pump head usually consists of at least two chambers sealed against each other (e.g. valve chamber and connection chamber). A motor-driven diaphragm causes the volume between the diaphragm and the first chamber component to change cyclically. When the diaphragm moves downwards (increasing the volume) the pumped medium is sucked in, when it moves upwards (decreasing the volume) it is expelled again. This change in volume causes the inlet and outlet valves, which are located between the first two chamber components, to open and close. The upper chamber component is used for the pneumatic or hydraulic connection of the pump, e.g. via hose olives, screw connections with internal threads or hose-free connection with O-rings (→ Manifold).
Our pump heads are designed to be highly leak-proof. This reliably prevents contamination of the pumped medium by the ambient air and falsification of the gas analysis measurement results. Pump heads must be chemically resistant to the pumped medium. We offer pump heads in many different material combinations, e.g. also for pumping chemically aggressive or particularly hot media.
see → Flow
Abbreviation in the type designations of our pumps (e.g. "SP V 12 RO-3DC-B-D"). The abbreviation designates our → rotary diaphragm pumps (rotary pumps / rolling pumps) for air and gases.
Abbreviation in the type designations of our pumps (e.g. "SP V 27 RO-12TW-D-L"). The abbreviation designates our → rotary diaphragm pumps (rotary pumps / rolling pumps) for liquids.
Rolling diaphragm pump
"Rolling pump", "rotary pump", see → Rotary diaphragm pump
Rotary diaphragm pump
A rotary diaphragm pump ("rotary pump", "rolling pump", "rolling diaphragm pump") is a motor-driven pump that uses an eccentric and wobble plate to move several diaphragms up and down in succession with each revolution of the motor. The downward-moving diaphragms create a vacuum that sucks the pumped medium into the pump chamber via inlet valves. As soon as the diaphragms move upwards again, the pumped medium is pressurised. The resulting overpressure closes the inlet valves. At the same time, the outlet valves are opened and the pumped medium flows out.
Rotating diaphragm pumps from Schwarzer Precision are particularly small and light. Since they work with several diaphragms (typically two to four diaphragms), they are smooth-running and quiet, with low-vibration. Due to the alternating superimposition of the individual pump pulses, they generate particularly low pulsation. This makes them ideal for applications with highly sensitive pressure sensors.
→ Overview of our rotary diaphragm pumps for gas conveyance
→ Overview of our rotary diaphragm pumps for pumping liquids
Rotary vane pump
see → Vane pump
The rotor is part of the pump head of the → vane pump. The rotor is mounted on the motor shaft and has four radially arranged slots on its outer circumference, which accommodate the freely movable vanes.
Abbreviation in the type designations of our pumps (e.g. "SP 300 SA-DV (AC)"). The abbreviation designates our → vibrating diaphragm pumps (vibrating armature pumps) for air and gases.
A self-priming pump can draw in liquids even when dry without having to completely fill the delivery system beforehand. This is particularly important for open conveying systems where the pump can suck in air during operation ("dry run"). Our → eccentric diaphragm pumps and → rotary diaphragm pumps (rolling pumps) for liquid delivery are all self-priming.
When configuring the tubing of a two-headed pump in series, the outlet of the first pump head is connected to the inlet of the second pump head. This combines the pressures (or vacuums) generated in both stages. In this way, a particularly high pressure or a particularly high vacuum can be generated. We offer two-headed pumps with serial tubing under the type designations "DUs" (→ Dual Head serial) and "THs" (→ Twin Head serial).
The service life of a pump is usually given in hours and describes the time a pump can be operated under defined conditions. Schwarzer Precision builds highly reliable pumps for years of use. Depending on your specific application (pumped medium, operating mode, operating point, temperature, etc.), we select the right pump for you. In doing so, we always pay attention to an optimal price/performance ratio. For example, an intermittently operated pump ("on-off operation") can in many cases easily be equipped with a low-cost iron core motor and plain bearings. For applications with high mechanical loads, coreless or brushless motors and ball bearings may be used. For pumping chemically aggressive media, we provide a variety of chemically resistant materials.
The stroke of a pump describes the length of the distance that is necessary for the complete deflection of the diaphragm (top dead center to bottom dead center). With our eccentric diaphragm pumps, the stroke is defined by the size of the rotating eccentric. In the case of electromagnetically driven pumps (vibrating armature diaphragm pumps, linear pumps, pivot pumps), the stroke is caused by the deflection of the armature vibrating in the magnetic field.
Pumps for suction delivery are mainly designed to achieve a certain vacuum (specified in mbar) or a certain suction height (specified in mH2O). These pumps are optimised for loads on the pump inlet side ("vacuum-optimised pump"). Depending on the required application, our pumps can be optimised for pressure applications (type designation "-DV") or vacuum applications (type designation "-VD"). You can use our → Product Finder to search specifically for pumps for suction delivery ("vacuum mode").
A technically tight design of the pump ensures exact and falsification-free measurement results, which are absolutely necessary, especially in environmental and medical gas analysis. The highly tight design of the → pump head and reliable sealing with media-resistant elastomers ensure that the pumped medium enters and leaves the pump exclusively via the connection pieces. This reliably prevents harmful intake of false air or contamination of the pumped medium by the ambient air.
Abbreviation in the type designations of our pumps (e.g. "SP 270 EC-THp") for two-head diaphragm pumps with parallel tubing See → Twin Head parallel
Abbreviation in the type designations of our pumps (e.g. "SP 270 EC-THs") for twin-head diaphragm pumps with serial tubing. See → Twin Head serial
Two-headed pump with a centrally mounted motor and two parallel pump heads (type designation "-TH"). The motor shaft extends out of both sides of the motor housing and drives one pump head each. Tubing of twin-head pumps can be configured in series or in parallel.
Twin Head parallel
Two-headed pump with parallel configured tubing (type designation "-THp"). The parallel configured tubing combines the flow ("volume flow") of both pump heads, resulting in a particularly high delivery volume.
Twin Head serial
Two-headed pump with serial configured tubing (type designation "-THs"). The outlet of the first pump head is connected to the inlet of the second pump head. The serial configured tubing combines the pressures (or vacuum) generated by both pump heads, resulting in a particularly high total pressure (or vacuum).
Vacuum therapy (VAC / vacuum assisted closure) is a therapeutic procedure in medical technology for the treatment of acute and chronic wounds. Specially adapted VAC pumps from Schwarzer Precision ensure fast and comfortable wound healing.
→ read more
The vacuum generated on the inlet side of our pumps is given as a minus value relative to the ambient pressure of 1013 mbar absolute (pump at rest = 0 mbar vacuum). Our delivery programme includes pumps in the vacuum range from -60 mbar to -970 mbar.
The vanes ("rotary vanes, vane cell plates") are part of the pump head of a rotary vane pump. The vanes move in the guide slots of the revolving rotor and are responsible for transporting the medium.
Our miniature vane pumps ("rotary vane pumps") are displacement pumps for suction or pressure delivery of air and other gases. They consist of a rotor that revolves eccentrically inside a cylindrical stator (pump housing). The rotor is pressed onto the motor shaft and has four radially arranged slots. The vane cell plates ("rotary vanes") sit in these guides. The centrifugal forces generated during rotation move the rotary vanes outwards in their guide slots and press them against the inner surface of the stator, dividing the space between rotor and stator into four pumping chambers. These rotating chambers transport the medium from the inlet to the outlet of the pump. Vane pumps are characterized by particularly low pulsation and linear adjustability. In addition, our vane pumps work completely oil-free and maintenance-free.
Click here for an → overview of our vane pumps (rotary vane pumps).
Abbreviation in the type designations of our pumps (e.g. "SP 620 EC-VD") for pumps that are primarily designed for suction delivery. See → Suction delivery
Vibrating armature pump
see → Vibrating diaphragm pump
Vibrating diaphragm pump
A vibrating diaphragm pump ("vibrating armature diaphragm pump") is an electromagnetically driven diaphragm pump that is usually operated on alternating voltage. With upstream electronics ("inverter"), these pumps can also be connected to direct voltages. The drive consists of an iron core coil and a magnetic armature. The current-carrying coil generates an alternating magnetic field that causes an oscillating movement of the armature. The armature in turn drives a diaphragm that conveys the pumped medium through the pump head.
Vibrating armature diaphragm pumps are particularly wear-resistant because they have no mechanical bearings. Due to their operating principle, these pumps do not achieve high pressures or vacuums. However, they are characterised by a highly efficient, durable and cost-effective design. Vibrating diaphragm pumps are typically used in gas analysis, liquid level measurement, pipetting and electrolyte circulation in battery chargers. Our vibrating armature pumps are only designed for pumping gases.
Click here for an → overview of our vibrating diaphragm pumps
Vibrations occur in pumps as a matter of principle. They are caused by the oscillating movements of the mechanical components as well as by the pressure changes in the pump chamber. Pumps from Schwarzer Precision are equipped with precisely matched balancing masses. This compensates vibrations as far as possible and ensures particularly quiet, low-vibration operation. Our pumps are therefore predestined for operation in particularly sensitive environments, e.g. in mobile medical devices that are worn directly on the patient's body.
see → Flow
see → Flow
The working point of a pump defines the flow (volume flow) at a specific back pressure or vacuum (e.g. 1.0 l/min flow at 100 mbar back pressure). With our → Product Finder you can specifically search for pumps which fulfill the defined operating point in your application.