ABOUT USknow more about us
Design When designing a diaphragm, remember to consider what can be done to extend the service life of the component. When you understand the inherent defects of the diaphragm, and the corresponding design, it can greatly improve the success rate of film production.
The main causes of early damage to the diaphragm include:
Mao Kou and sharp edge
abrasion
Exhaust back pressure
Circumferential compression
Smooth surface with suitable hardware
Obviously, the first step is the hardware design. The first thing to consider is to eliminate the possibility of touching the membrane of the hair and sharp edges. Even tiny flaws and cracks can cause breakage of cloth and rubber, causing premature damage.
The smoother the surface the better
Smoothness is not directly related to hardware completion. When the pressure continues to apply and slow down, the diaphragm will rub its support hardware. If the surface of the hardware is rough, it will wear the cloth and cause premature damage.
How smooth is enough?
We suggest that the hardware surface should be no more than 32 micro inches thick, and in high frequency operation, should limit the thickness in 16 micro inch (alternative: hardware surface should be no more than 32 micro inches thick, and in high frequency operation, should be limited to 16 micro inches thickness as more desirable). Although the film does not need lubricant, but suggested that in the installation before the diaphragm coated with a layer of MoS2 to reduce wear. At the same time, the piston should also be coated with Teflon, which can reduce the displacement of the diaphragm when the piston friction. Alternatively, a layer of rubber is coated on the piston to reduce friction by preventing the displacement of the diaphragm.
Coaxial and controllable exhaust pressure
The position of the diaphragm and its side wall is the most prone to failure. When this happens, the two layers of rubber film buckle together, while the piston continues to operate. This causes the diaphragm wall plug to plug in the middle of the piston and the cylinder wall, resulting in tearing of the rubber and cloth. There are two reasons for this:
1 first of all, is the line between the piston and the cylinder. When operated at high pressure, if the pressure applied to the diaphragm is equal to that of the piston, the piston is not centered. When operated at low pressure, however, gravity acts, pulling the piston to the side and causing trouble. To avoid this situation, can install a bushing for piston. Or other methods to fix the piston in the middle of the whole stroke.
2 the cause of the failure of the second is the pressure back. In general, the diaphragm can be highly divided in a single direction. If the low pressure side of the pressure suddenly increased, will lead to the breakdown of the wall caused by failure. The problem caused by the back pressure usually occurs when the user is not aware.
Back pressure: pay attention to "single line"
The pressure is usually on the side of the diaphragm pressure will not cause problems, because the volume of the device determines the operation. Usually, the pressure relief problem occurs at the low pressure side, because the side of the gas, liquid in the diaphragm of each stroke must be discharged and replaced.
Reducing the effect of pressure relief by ventilation
The size of the ventilation hole must be of moderate size, so that there is enough gas to enter and rub the diaphragm in the correct time. The size of the vent should be carefully considered in the case of accelerated testing when the brake sequence is increased or when the device is subjected to high pressure and fast operation.
When designing a diaphragm, remember to consider what can be done to extend the service life of the component. When you understand the inherent defects of the diaphragm, and the corresponding design, it can greatly improve the success rate of film production.
The main causes of early damage to the diaphragm include:
Mao Kou and sharp edge
abrasion
Exhaust back pressure
Circumferential compression
Smooth surface with suitable hardware
Obviously, the first step is the hardware design. The first thing to consider is to eliminate the possibility of touching the membrane of the hair and sharp edges. Even tiny flaws and cracks can cause breakage of cloth and rubber, causing premature damage.
The smoother the surface the better
Smoothness is not directly related to hardware completion. When the pressure continues to apply and slow down, the diaphragm will rub its support hardware. If the surface of the hardware is rough, it will wear the cloth and cause premature damage.
How smooth is enough?
We suggest that the hardware surface should be no more than 32 micro inches thick, and in high frequency operation, should limit the thickness in 16 micro inch (alternative: hardware surface should be no more than 32 micro inches thick, and in high frequency operation, should be limited to 16 micro inches thickness as more desirable). Although the film does not need lubricant, but suggested that in the installation before the diaphragm coated with a layer of MoS2 to reduce wear. At the same time, the piston should also be coated with Teflon, which can reduce the displacement of the diaphragm when the piston friction. Alternatively, a layer of rubber is coated on the piston to reduce friction by preventing the displacement of the diaphragm.
Coaxial and controllable exhaust pressure
The position of the diaphragm and its side wall is the most prone to failure. When this happens, the two layers of rubber film buckle together, while the piston continues to operate. This causes the diaphragm wall plug to plug in the middle of the piston and the cylinder wall, resulting in tearing of the rubber and cloth. There are two reasons for this:
1 first of all, is the line between the piston and the cylinder. When operated at high pressure, if the pressure applied to the diaphragm is equal to that of the piston, the piston is not centered. When operated at low pressure, however, gravity acts, pulling the piston to the side and causing trouble. To avoid this situation, can install a bushing for piston. Or other methods to fix the piston in the middle of the whole stroke.
2 the cause of the failure of the second is the pressure back. In general, the diaphragm can be highly divided in a single direction. If the low pressure side of the pressure suddenly increased, will lead to the breakdown of the wall caused by failure. The problem caused by the back pressure usually occurs when the user is not aware.
Back pressure: pay attention to "single line"
The pressure is usually on the side of the diaphragm pressure will not cause problems, because the volume of the device determines the operation. Usually, the pressure relief problem occurs at the low pressure side, because the side of the gas, liquid in the diaphragm of each stroke must be discharged and replaced.
Reducing the effect of pressure relief by ventilation
The size of the ventilation hole must be of moderate size, so that there is enough gas to enter and rub the diaphragm in the correct time. The size of the vent should be carefully considered in the case of accelerated testing when the brake sequence is increased or when the device is subjected to high pressure and fast operation.

Add:Ningbo City Jiangnan Road No. 673 building innovation Lau  

E-mail:sales@sdsealing.com

Tel:0086-574-87498258 

Copyright :Ningbo Stern Sealing Technology Co., Ltd.   浙ICP备13003602号-2   Technical support:huaqilifang