Both belong to motor-driven proportional valves, sharing the same core operating principle—the motor drives the spool movement, and controlling the motor’s rotational position precisely adjusts the spool opening, thereby achieving proportional control of flow or pressure. However, the Hilintec SCPV significantly outperforms conventional stepper-motor proportional valves in the following four aspects: 1. More advanced drive method:The Hilintec SCPV adopts FOC (Field-Oriented Control) vector drive with sinusoidal current commutation, ensuring smooth operation, low heat generation, millisecond-level response speed, and excellent acoustic performance. In contrast, conventional stepper motors use open-loop step drive, which suffers from step loss, resonance, and noticeable noise. 2.

Understanding the Differences Among Rotameters, Soap Film Flowmeters, and Mass Flowmeters, and Choosing the Right Standard In the testing and application of positive‑displacement pumps such as diaphragm pumps, you may often encounter this question: under the same operating conditions, the same pump gives a notably higher reading with a rotameter, a different value with a mass flowmeter, and yet another with a soap film flowmeter. In practice, the rotameter reading is commonly referred to as the “peak flow rate,” the soap film flowmeter reading as the “average flow rate,” and the mass flowmeter directly provides the “mass flow rate.” Three

You may encounter this situation: you receive a diaphragm liquid pump, and the specification sheet states “Maximum output pressure: 0.3 MPa.” When you integrate it into your system, block the outlet, and take a measurement, the pressure gauge reading surges upward, easily exceeding the rated value and approaching 0.5 MPa or even higher. Does this mean the pump is broken? Or has the manufacturer falsified the specifications? In fact, this is neither a malfunction nor false advertising—it is a common yet easily misunderstood phenomenon in fluid machinery. To understand it, we need to revisit a fundamental concept: the rated maximum

1. Low Speed Inevitably Reduces Torque OutputWhen reducing the speed of a brushless DC motor by lowering the PWM duty cycle, the electromagnetic torque it delivers decreases significantly. The system naturally enters a low-torque operating regime. The lower the speed, the weaker the motor’s ability to overcome external loads. 2. Heavy Loads Can Cause StallingIf the pump is operating under a heavy load—for instance, due to high discharge pressure, high vacuum or positive pressure output, or increased pipeline resistance—the torque available from the motor may become insufficient to keep the pump rotating. As a result, the pump head can come

A: Vacuum filtration, also known as “suction filtration,” is an application that uses vacuum-generating equipment, such as vacuum pumps, to accelerate the separation of solid-liquid mixtures. The equipment used typically includes a Buchner funnel, a filtration flask, and a vacuum pump. When selecting an appropriate micro vacuum pump, two main factors should be considered:(1) Consider the pressure resistance of the funnel and filter paper to determine the required vacuum level for the pump.(2) Consider the power supply for the application scenario. For example, when used in the field without mains power, a low-power micro vacuum pump powered by batteries can

A: In the field of chemical analysis, gas washing typically involves bubbling gas through a washing bottle filled with liquid to remove impurities soluble in the liquid or to remove or convert specific components through reaction with the liquid. In aquaculture, aeration increases the dissolved oxygen levels in the water. In wastewater treatment, the purpose of aeration is to prevent solids from settling in the tank, enhancing contact between organic matter, microorganisms, and dissolved oxygen, thus ensuring the oxidation and decomposition of organic pollutants by microorganisms under sufficient oxygen conditions. Both aeration and gas washing usually require the exhaust tube