The working principle of the hemodialysis machine is: dialysis concentrated liquid and dialysis water are prepared into qualified dialysate through the dialysate supply system, and through the hemodialyzer, the solute dispersion, penetration and ultrafiltration are carried out with the patient’s blood drawn by the blood monitoring and alarm system; The patient’s blood is returned to the patient’s body through the blood monitoring alarm system, and the post-dialysis fluid is discharged as waste liquid by the dialysate supply system
1.what is the working principle of the check valve?
The working principle of one-way valve is to use fluid pressure and the gravity of the valve disc to control the opening and closing of the valve. When the fluid flows in from the inlet end, the fluid pressure acts on the side of the valve disc, pushing the disc downwards, so that the disc is pressed against the valve seat, thus preventing the fluid from flowing backwards. When the fluid stops flowing in, the disc will return to its initial position by gravity, closing the valve.
2.The role of the check valve in dialysis appatatus
To prevent backflow:The check valve allows the fluid to flow in one direction in the dialyser, thus preventing the fluid from flowing back. It helps maintain the stability of the system and prevents liquid mixing or contamination.
Equipment protection: In a dialysis machine, the check valve prevents the pump from being damaged by pressure shock when it stops. At the same time, it also prevents the loss of liquid in the system and prevents air from entering the system.
To achieve pressure holding function: check valve with its good sealing, you can achieve pressure holding function in the system to ensure the stability of the system pressure.
Combined with other components: check valves can be used with other components to form composite valves, such as one-way throttle valves, one-way sequence valves, etc., to meet different system requirements
In summary, the role of the check valve on the dialyser is mainly to prevent countercurrent, protect the equipment, achieve pressure holding function, and use it in combination with other components to meet different system requirements.
3.Working principle of check valve in dialysis apparatus
The working principle of the check valve in the dialysis machine mainly depends on its characteristics of controlling the one-way flow of the fluid to ensure the safety and efficiency of the dialysis process. The specific working principle is as follows
<1>Froward direction (positive pressure) : When blood flows from the patient’s blood vessels through the dialyser into the dialyser, the fluid pressure direction is consistent with the design direction of the check valve, and the valve opens to allow the blood to pass through smoothly. Waste and excess water in the blood are filtered out and flow to the outlet of the dialysis machine
<2>Backword direction (negative pressure) : When blood tries to flow back into the patient’s blood vessel from the outlet of the dialyzer, the direction of pressure of the fluid is opposite to the direction designed for the check valve, and the valve closes, preventing the blood from flowing back. This prevents air or other impurities from entering the patient’s blood circulation system, while ensuring effective filtration of the dialyzer.
This design of the one-way valve ensures the one-way flow of blood in the dialysis machine, thus ensuring the safety and effectiveness of the dialysis process. In practical applications, check valves are often used in hydraulic systems to allow one-way flow of oil and prevent backflow. Its structure usually includes components such as a spool, a valve body and a spring. In addition, the check valve can also be used as a back pressure valve, by changing the spring to adjust the back pressure.
4.How to choose a suitable check valve for the dialysis machine
When choosing a check valve for a dialysis machine, there are several key factors to consider
<1>Medium characteristics: The media in the dialyser may include blood, dialysate, etc., so it is necessary to choose a check valve material that can withstand these media, while ensuring that the sealing material is compatible with the media to avoid contamination or reaction.
<2>Flow and pressure requirements: According to the working pressure and flow requirements of the dialyser, select the appropriate type of check valve. Ensure that the rated pressure and flow of the check valve can meet the working conditions of the dialyser.
<3>Installation mode and connection mode: Considering the actual installation space and connection mode of the dialyser, select the appropriate check valve installation mode and connection mode, such as threaded connection, flange connection, etc.
<4>Additional functions and special requirements: If the dialyser has special functional requirements, such as decompression, flow regulation, etc., you can choose a check valve with these functions
<5>Reliability and safety: Medical equipment has high requirements for the reliability and safety of components, and priority should be given to well-known brands or products that have been certified to ensure their stability and safety in long-term operation.
<6>Maintenance and maintenance: Consider the maintenance and maintenance needs of the check valve, and choose products that are easy to maintain and clean to ensure the long-term stable operation of the equipment.
By taking the above factors into consideration, a check valve suitable for the dialysis machine can be selected to ensure that it can meet the working needs of the equipment and ensure the safety of the patient.
5.Which model use most in dialysis appatatus from our company
Majority are CJT061 and CJT181,The performance and size of these two products are in line with most dialysis machines on the market.
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