German LUTZ pump LUTZ model LUTZ price

LUTZ pumps use a diaphragm to separate the liquid being pumped from the plunger and pump cylinder, thereby protecting the plunger and pump cylinder. The parts of the left side of the diaphragm that come into contact with the liquid are made of corrosion-resistant materials or coated with a layer of corrosion-resistant substance; the right side of the diaphragm is filled with water or oil.

LUTZ pump main materials

Diaphragm pumps are a major type of actuator. They change fluid flow by accepting control signals output from the regulation and control unit and using power operation. In the control process, the role of the diaphragm pump is to accept control signals from the regulator or computer, change the flow rate of the controlled medium, and maintain the controlled parameters within the required range, thereby achieving automation of the production process. If the automatic regulation system is compared with the manual regulation process, the detection unit is the human eye, the regulation and control unit is the human brain, and the execution unit—the diaphragm pump—is the human hands and feet. To achieve regulation and control of a certain parameter in the process, such as temperature, pressure, flow rate, or liquid level, diaphragm pumps are indispensable. Pneumatic diaphragm pumps commonly use five materials: plastic, aluminum alloy, cast iron, stainless steel, and Teflon. Electric diaphragm pumps use four of these materials: plastic, aluminum alloy, cast iron, and stainless steel. Diaphragm pump diaphragms use nitrile rubber, neoprene rubber, fluorine rubber, polytetrafluoroethylene, polyhexafluoroethylene, etc., depending on the liquid medium, for installation in various special occasions to pump various media to meet requirements.

LUTZ pump working principle

The diaphragm pump is a relatively special form of positive displacement pump. It relies on the reciprocating movement of a diaphragm to change the volume of the working chamber, thereby sucking in and discharging liquid. A pneumatic diaphragm pump mainly consists of two parts: the transmission part and the diaphragm cylinder head. The transmission part is the drive mechanism that drives the diaphragm to move back and forth. Its transmission forms include mechanical transmission, hydraulic transmission, and pneumatic transmission, among which hydraulic transmission is more widely used. The working part of the diaphragm pump mainly consists of a crank-link mechanism, plunger, liquid cylinder, diaphragm, pump body, suction valve, and discharge valve. Among them, the drive mechanism composed of the crankshaft link, plunger, and liquid cylinder is very similar to that of a reciprocating plunger pump. When the diaphragm pump is working, the crank-link mechanism, driven by the motor, drives the plunger to perform reciprocating motion. The motion of the plunger is transmitted to the diaphragm through the working liquid (usually oil) in the liquid cylinder, causing the diaphragm to move back and forth. In the cylinder head part of the pneumatic diaphragm pump, a diaphragm separates the liquid to be transported from the working liquid. When the diaphragm moves toward the transmission mechanism side, the pump cylinder operates under negative pressure to suck in liquid; when the diaphragm moves to the other side, it discharges liquid. The liquid being transported is separated from the working liquid by the diaphragm inside the pump cylinder and only comes into contact with the pump cylinder, suction valve, discharge valve, and the inner side of the diaphragm, without contacting the plunger and sealing devices. This allows important parts such as the plunger to work completely in the oil medium, ensuring good working conditions. The diaphragm must have good flexibility and good corrosion resistance, and is usually made of materials such as polytetrafluoroethylene and rubber. The pot-shaped parts with mesh holes on both sides of the diaphragm are set to prevent excessive local deformation of the diaphragm and are generally called diaphragm limiters. Pneumatic diaphragm pumps have good sealing performance and can easily achieve leak-free operation. They can be used to transport corrosive liquids such as acids, alkalis, and salts, as well as high-viscosity liquids. In the two symmetrical working chambers of the pump, each is equipped with a diaphragm, connected into one unit by a central connecting rod. Compressed air enters the air distribution valve from the pump's air inlet. Through the air distribution mechanism, compressed air is introduced into one of the chambers, pushing the diaphragm in the chamber to move, while the gas in the other chamber is discharged. Once the end of the stroke is reached, the air distribution mechanism automatically introduces compressed air into the other working chamber, pushing the diaphragm to move in the opposite direction, thereby causing the two diaphragms to continuously and synchronously perform reciprocating motion. In the diagram, compressed air enters the air distribution valve, causing the diaphragm to move to the right. The suction force of the chamber causes the medium to flow in from the inlet, pushing the ball valve into the chamber. The ball valve is locked due to suction. The medium in the chamber is squeezed, pushing open the ball valve to flow out from the outlet, while simultaneously locking the ball valve to prevent backflow. This cycle repeats, continuously sucking the medium in from the inlet and discharging it from the outlet.

LUTZ pump application advantages

The diaphragm pump is a new type of conveying machinery that can transport various corrosive liquids, liquids with particles, high-viscosity, volatile, flammable, and highly toxic liquids. Diaphragm pumps come in four materials: plastic, aluminum alloy, cast iron, and stainless steel. Depending on the liquid medium, diaphragm pumps use nitrile rubber, neoprene rubber, fluorine rubber, polytetrafluoroethylene, and polyhexafluoroethylene to meet the needs of different users. Installed in various special occasions to pump media that conventional pumps cannot handle, they have achieved satisfactory results. In the painting and ceramics industries, diaphragm pumps occupy an absolutely dominant position. The advantages of pneumatic diaphragm pumps are: 1) Since air is used as power, the flow rate automatically adjusts with changes in back pressure (outlet resistance), making it suitable for medium to high viscosity fluids. The operating point of a centrifugal pump is set based on water. If used for slightly higher viscosity fluids, it requires a gearbox or variable frequency drive, which greatly increases costs. The same applies to gear pumps. 2) Using pneumatic pumps in flammable and explosive environments is reliable and low-cost, such as for transporting fuel, gunpowder, and explosives, because: First, no sparks can be generated after grounding; Second, no heat is generated during operation, so the machine will not overheat; Third, the fluid will not overheat because the diaphragm pump causes minimal agitation to the fluid. 3) In harsh construction sites, such as construction sites and industrial wastewater discharge, impurities in sewage are numerous and complex in composition, making pipelines prone to clogging. This creates an excessive load on electric pumps, causing the motor to overheat and become easily damaged. Pneumatic diaphragm pumps can pass particles and have adjustable flow rates. They automatically stop when the pipeline is blocked until it is clear. 4) Can be used to transport chemically unstable fluids, such as photosensitive materials and flocculant liquids. This is because the shear force of the diaphragm pump is low, causing minimal physical impact on the material. 5) In the handling of hazardous and corrosive materials, the diaphragm pump can completely isolate the material from the outside environment. 6) Or to ensure no impurity contamination of raw materials in some tests. In addition, the diaphragm pump is small in size, easy to move, requires no foundation, occupies very little floor space, and is simple and economical to install. It can be used as a mobile material transfer pump.

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