Wafer dual plate check valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. Wafer dual plate check valve is an automatic valve whose main function is to prevent the backflow of the medium, prevent the reverse rotation of the pump and the driving motor, and discharge the medium in the container. Wafer dual plate check valves can also be used on lines supplying auxiliary systems where the pressure may rise above the system pressure.
1. Wafer type double plate check valve application:
Wafer dual plate check valve is installed in the pipeline system, and its main function is to prevent the backflow of the medium. The wafer dual plate check valve is an automatic valve that is opened and closed depending on the medium pressure. Wafer-type dual plate check valve is suitable for nominal pressure PN1.0MPa~42.0MPa, Class150~25000; nominal diameter DN15~1200mm, NPS1/2~48; working temperature -196~540℃ on various pipelines , used to prevent backflow of the medium. By choosing different materials, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and uric acid.
2. The main material of the wafer dual plate check valve:
There are carbon steel, low temperature steel, dual phase steel (F51/F55), titanium alloy, aluminum bronze, INCONEL, SS304, SS304L, SS316, SS316L, chrome molybdenum steel, Monel (400/500), 20# alloy, Hastelloy and other metal materials.
3. Structural characteristics of dual plate check valve:
1. The structural length is short, and its structural length is only 1/4~1/8 of the traditional flanged swing check valve.
2. Small size and light weight, its weight is only 1/4~1/20 of the traditional flanged swing check valve.
3. The valve disc closes quickly and the water hammer pressure is small
4. Both horizontal pipes or vertical pipes can be used, easy to install
5. The flow channel is smooth and the fluid resistance is small
6. Sensitive action and good sealing performance
7. The valve disc travel is short and the closing impact force is small
8. The overall structure is simple and compact, and the shape is beautiful
9. Long service life and reliable performance
Fourth, the common faults of the dual plate check valve are:
1. The valve disc is broken
The pressure of the medium before and after the dual plate check valve is in a state of close balance and mutual “saw”. The valve disc is often beaten with the valve seat, and the valve disc made of some brittle materials (such as cast iron, brass, etc.) is beaten. broken.
The preventive method is to use a dual plate check valve with a disc as a ductile material.
2. Medium backflow
The sealing surface is damaged; impurities are trapped.
By repairing the sealing surface and cleaning impurities, backflow can be prevented.
Post time: Sep-23-2022