Knowledge of metering pump accessories and pipeline accessories

Included in the accessory kit are: foot valve, injection valve, 2m suction tube and 5m discharge line. What components are included in a complete metering pump head? A complete liquid end includes the following components: pump head, diaphragm, valve, back plate and mounting bolts. What is the main purpose of the foot valve? The foot valve itself has a certain weight to keep the suction line straight and make the suction line perpendicular to the chemical tank. In addition, it is also a check valve to maintain the positive flow of chemical liquid. The foot valve also helps to improve the repeatability and proper suction of the pump. There is a filter screen in the bottom valve to prevent solid particles from being sucked into the suction line. The inhalation of small solid particles may cause damage to the diaphragm of the metering pump. The bottom valve also includes a connector for connecting a suction pipe. The bottom valve should be installed vertically, and keep the bottom valve at a certain distance from the bottom of the storage barrel. It is very necessary to select the bottom valve of most metering pumps that work by self-priming. What is the main purpose of the injection valve? Injection valves are used in the connection of discharge lines and injection points. Injection valves are not intended to be used as isolation devices or as protection against siphonage. In occasions where the requirements are not too high, the injection valve can generate a back pressure of 0.5 bar. What is the main purpose of flushing equipment? Flushing equipment is used to clean the pump head and discharge line of the metering pump. It is mainly used in the case where the metering chemicals are prone to solidification or the metering pump needs to be idle frequently. What is a float switch and what is its main function? The float switch is a very critical device to control the liquid level of the storage tank. When the liquid level drops, the float sinks and the contact in the switch closes. This contact can be used to control the metering pump, such as stopping the metering pump 1 and starting the metering pump 2. It can also be used to turn on the alarm / indicator light to indicate the storage tank null. By reversing the action of the float, a float switch can be applied to the collecting tank, indicating that the collecting tank is full and stopping the metering pump. What is the difference between a single-stage float switch and a two-stage float switch? When the switch is activated, the single-stage float switch directly stops the metering pump. For the two-stage float switch, when the first stage is activated, it can be used to alarm and indicate the low liquid level of the medicine storage tank. When the stage switch is activated, the metering pump stops. What is a multi-function valve? A multi-function valve is a very versatile product that can generate a constant back pressure to ensure repeatable metering accuracy. The function of anti-siphon valve is integrated in the equipment, which can prevent chemicals from being sucked into the vacuum pipeline, and prevent Venturi effect or negative delivery pressure head in the waterway. The pressure relief valve function is integrated in the equipment, which can protect the metering pump, pipeline and other system equipment and prevent overpressure work when the system pipeline is blocked. The multi-function valve is also integrated with the function of a liquid introduction valve, which can release the pressure of the discharge pipeline and help the metering pump to induce liquid. The multi-function valve allows the safe return of the discharge liquid to the medicine storage tank. What is the main function of a flow monitor? Flow monitoring utilizes proximity switches that are activated on each flow pulse. The metering pump compares the discharge stroke with the number of pulses detected by the flow monitor. If the pump fails to detect the corresponding pulse signal for 8 consecutive strokes or the set number of strokes, the metering pump will stop and give a fault indication. In the case of empty, blocked or leaking suction line, blockage of discharge line, broken diaphragm, etc., the flow monitor can send out an alarm signal by detecting no pulse signal. If the metered flow drops by 20% or less than the set value, the proportional flow monitor can detect it. What are the main uses of fault alarm relays and step relays? The alarm relay contacts open (NC) or close (NO) in the event of a metering pump failure. When the metering pump fails, the synchronizing relay is closed. Usually the synchronizing relay is connected to the dependent metering pump to generate the same frequency as the main metering pump. What is the main purpose of a pulsation damper? Properly sized pulsation dampeners can reduce pulsation by 90% or more, resulting in a nearly laminar flow. The pulsation damper reduces the acceleration of the metered medium and reduces head losses. What is the difference in function between a snubber and a pulsation dampener? The buffer can reduce the pulsation of the pipeline, reduce the acceleration of the medium and reduce the head loss at the same time. There is no separation of liquid and gas inside the buffer. The buffer lumen will eventually fill with fluid and the fluid will need to be drained. What is a diaphragm rupture monitor and how does it work? There is a leak drain hole on the back plate between the drive end and the pump head, and a conduit connects the leak drain hole to a small cylinder. If the diaphragm breaks, the liquid is discharged into the small cylinder through the leakage discharge hole. There is a float switch in the small cylinder, as long as there is 10ml of liquid in the cylinder, the float switch can be activated. Switch contacts can be set as normally open or normally closed.