During the selection process for diaphragm pumps, choosing the correct diaphragm material is one of the core factors that determine whether the equipment can operate stably over the long term. As a critical moving component of the pump, the diaphragm must not only withstand millions of reciprocating flexing cycles but also resist corrosion from various chemical media while maintaining sealing performance and dimensional stability. Engineers often face a difficult choice among four mainstream materials: EPDM (ethylene propylene diene monomer), FKM (fluorocarbon rubber), FFKM (perfluoroelastomer), and PTFE composite diaphragms. Based on the technical expertise accumulated in Hilin Technology’s White Paper on Corrosion

In flow and pressure control applications, the proportional valve serves as a critical actuator that executes control commands. Compared with traditional electromagnetic proportional valves, the core advantage of the Hilin SCPV servo proportional valve lies in its closed-loop servo control and high-precision position sensor, which fundamentally overcome the inherent issues of electromagnetic valves such as dead zone, nonlinearity, hysteresis, and thermal drift. The specific differences between the two are as follows: 1. Drive Principle and Core Differences 2. In-Depth Performance Comparison Parameter SCPV Servo Proportional Valve Electromagnetic Proportional Valve Dead Zone & Micro-Response No dead zone; responds to even the

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