As it grew in prominence, scientists and engineers looked for ways to make the process more efficient and profitable. Flow Technology offers a wide range of hydraulically actuated Double diaphragm pumps.The design of the pump head ensures that the diaphragm cannot be damaged under critical conditions such as a blocked pipe or closed valves upstream or downstream of the pump.The freely defl ecting diaphragm makes the pump suitable for the metering of slurrieS. Many historians believe that Archimedes, the Greek polymath, came up with the design for his screw, the Archimedes screw, after visiting there. All these methods involve taking a measured amount of a chemical and then injecting that product into a pipe or similar vessel. This can vary in size and materials but is generally a variety of chemical resistant plastic (PVC, PE or similar), rubbers or stainless steel. This can have a variety of bleed, pressure relief, air release valves included into it but generally it is just a line. Once a shot of product is released or the pump stops, the one way valve stops the liquid in the delivery line from going up the dosing line and damaging the pump. 6. Control system. Occasionally there is a control system installed to ensure the dosing pump is accurate and turns on and off at particular times. Releasing the product into the middle of the stream also creates a vortex which allows the product to mix properly too which is beneficial to ensure a proper reaction takes place. Over time certain products especially acids and oxidisers like chlorine or peroxide can corrode the walls of a pipe if released right at the edge of the stream. This can be as simple as a timer or flow switch right through to a full SCADA or similar central . Types Variable displacement constant speed pumps are metering pumps that control the amount of liquid being pumped at a time (flow rate) by changing the stroke, or displacement. Examples of machines that rely on variable displacement constant speed pumps including drink dispenser systems and dialysis machines.Fixed displacement variable speed pumps adjust flow rate based on motor speed, خرید دوزینگ پمپ not stroke. Peristaltic pumps are a lesser known type of pump. Diaphragm pumps have a diaphragm through which repeated compression/decompression motion is transmitted. The injector. At the point at which the product is injected into the product, there is an injector point. It is placed into the drum of product and allows the pump to remain primed.