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The importance of pump and valve diaphragms
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Pump and valve diaphragms are core functional components of fluid conveying equipment such as micro pumps, metering pumps, solenoid valves, etc. They achieve fluid suction, discharge and pressure control through their own reciprocating deformation and are widely used in medical, automotive, industrial automation and other fields.
Its performance directly determines the three core links:
① Ensuring the operational life of the pump and valve, the wear resistance and anti-cracking ability of the diaphragm affect the overall service life of the equipment;
② To maintain the accuracy of fluid transportation, stable diaphragm performance can ensure that the pump's flow rate meets the standard with small fluctuations.
③ Control the operating cost of the equipment. High-quality diaphragms can prevent additional losses caused by frequent replacement, motor overload and other issues. Therefore, the quality of pump and valve diaphragms is of vital importance to the stability, reliability and operational efficiency of fluid equipment, and it is a key guarantee for the efficient operation of fluid control systems.
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Common problems with pump and valve diaphragms
In the practical application of pump and valve diaphragms, five key issues that directly affect equipment performance and operating costs are prone to occur
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Lifespan & Strength Issues:Diaphragm has substandard lifespan and is easy to crack, disabling pump/valve fluid delivery, causing shutdown, increasing replacement frequency, maintenance costs and production interruption risks.
Flow Control Issues:Pump has substandard or unstable flow; fluid delivery deviation affects process precision (e.g., medical liquid, industrial reagent), leading to product quality fluctuations.
Motor Load Issues:Driving motor has excessive load and high current; long-term overload accelerates aging, shortens lifespan, and may cause circuit faults and equipment damage in severe cases.
Wear & Deformation Issues:Diaphragm is prone to wear and deformation. Wear reduces sealing and causes leakage; deformation changes movement trajectory, worsening flow instability and motor overload.
Environmental Compliance Issues:Diaphragm fails to meet environmental requirements; excessive harmful substances in medical, food fields will lead to unqualified tests and loss of market access.
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The causes of the problem
The root causes of the five types of problems can be precisely analyzed from three dimensions: product design, material properties, and production processes
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The reasons for the issues of lifespan and strength: The core lies in the unscientific design ratio of the wall thickness of the product cavity. The force-bearing points of the wall thickness are overly concentrated, which leads to fatigue damage in the stress concentration areas of the diaphragm during reciprocating motion, eventually causing rupture and shortening the service life.
The causes of flow control problems: First, the hardness of the diaphragm is too high or too low, which cannot match the operational requirements of the pump and valve, affecting the efficiency of fluid suction and discharge. Second, the production process is unstable, with large fluctuations in parameters at each stage, resulting in significant performance differences among diaphragms of the same batch and subsequently causing unstable flow rates.
The cause of the motor load problem: mainly, the hardness of the diaphragm is too high or the wall thickness is too thick, which increases the resistance during the reciprocating motion of the diaphragm, causing the motor to need to output more power to drive, and eventually resulting in excessive load and large current.
The causes of wear and deformation problems: On the one hand, the diaphragm is too hard. After being compressed, the cavity is prone to expansion and enlargement, which leads to increased friction with other components and causes wear. On the other hand, the size of the plastic parts varies, and the fit accuracy with the diaphragm is insufficient, further accelerating the deformation of the diaphragm.
The reasons for the environmental compliance issues: The diaphragm formula design has inherent flaws and has not fully considered the environmental protection testing items of various countries (such as RoHS, REACH, etc.), resulting in excessive micro-content of harmful substances (such as heavy metals, harmful chemicals) in the formula and failing to meet environmental protection standards.
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DOIT's solution
In response to the above-mentioned pain points of pump and valve diaphragms, DOIT has proposed precise corresponding solutions from four dimensions: design optimization, material adjustment, process control, and environmental protection research and development
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Lifespan & Strength Issues:The diaphragm has substandard lifespan and is easy to crack. This directly disables normal fluid delivery of pumps and valves, causing equipment shutdown, increasing diaphragm replacement frequency, maintenance costs and production interruption risks.
Flow Control Issues:The pump has substandard flow rate or unstable flow during operation. Deviations in fluid delivery volume affect production process precision (e.g., medical liquid delivery, industrial reagent proportioning), leading to product quality fluctuations.
Motor Load Issues:The motor driving the pump/valve has excessive load and high working current. Long-term overload accelerates motor aging, shortens its lifespan, and may cause circuit faults and equipment damage in severe cases.
Wear & Deformation Issues:The diaphragm is prone to wear and deformation after use. Wear reduces its sealing performance and causes fluid leakage; deformation changes its movement trajectory, further worsening flow instability and motor overload.
Environmental Compliance Issues:The diaphragm fails to meet strict environmental requirements. In high-standard fields like medical care and food, excessive harmful substances will make the product fail environmental tests and lose market access qualification.
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DOIT has 15 years of rich experience in rubber precision design and has successfully solved all the above problems.
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