![]() ![]() The hose in a hose pump can be changed on a regular schedule to avoid leaks, or after a hose leak detector is triggered. The service interval varies from application to application, but the hose pump generally provides a longer service interval because only one wearable piece is in contact with the medium. The maintenance personnel, typically the most familiar with the piece of equipment, perform preventative maintenance as well as repairs to achieve long service intervals. All can be wired to sound an alarm and/or stop the pump to avoid further damage. A pulsation dampener can typically remove ~95 percent of the pulsation to eliminate the unwanted pressure spikes and system interruption.ĭiagnostic systems can help monitor the overall system, including flow sensors, pressure sensors, hose leak detection, diaphragm detection, etc. Both pumps tend to create a pulse in the medium, but the hose pump is almost continuous even at lower speeds while the diaphragm pump creates an intermittent injection. ![]() A diaphragm pump can also be run this way using a solenoid. The user can also vary the speed of a DC motor. An integrated frequency inverter is typically used on hose pumps to cycle an AC gear motor. ![]() The output flow for both types of pumps can be controlled remotely. Although diaphragm pumps are rated for and can operate at higher pressures, the reliability significantly decreases at those higher pressures. At the maximum pressure, the hose pump can easily self prime, pull 95 percent of vacuum and keep output volume consistent. The peristaltic hose pump is generally limited by a maximum discharge pressure of 225-psi. Typically AOD pumps can handle higher temperature ranges by using Teflon diaphragms. High temperatures can reduce pressure capability and suction lift, while low temperatures reduce rubber life expectancy and suction lift. The temperature and metal and rubber components of the pump can affect the fluid. Pump users must be aware of the fluid temperatures. While the vigorous back and forth motion of a diaphragm can beat up delicate fluids, a hose pump pushes the fluid through the pump in a similar way to squeezing a tube of toothpaste. These shear stresses can severely damage a fluid. The forces exerted by the pump affect some fluids more than others. While the hose pump is self priming, it will consistently pump liquids and gases. The buildup of gas inside the pump can cause the diaphragm pump to lose prime and shut down. Some fluids change properties when the temperature or pressure is changed frequently. ![]() Outgassing can create problems with diaphragm pumps but not hose pumps. Diaphragm pumps tend to clog easily, or the thin diaphragms puncture. Hose pumps, designed for heavy slurries, can handle high solid content easily. While the particle size can vary, the pump must be able to pass these solids through without incurring any damage, which is difficult. Some un-dissolved solids exist in the fluid. The rubber hose is available in many different elastomers. In a hose pump, the only piece in contact with the medium is the hose. Every part that is in contact with the fluid needs to be chemically resistant to it.Īir Operated Diaphragm pumps use multiple "wetted" parts consisting of metal and rubber parts, including a suction strainer, filter screen with check valve ball type, pump body, rubber seals, springs and diaphragms. When choosing a pump for paint systems, the first thing to explore is chemical compatibility. ![]()
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