chromium molybdenum steel check valve
Product overview
Chromolybdenum steel check valve is a valve body, valve cover, guide sleeve, valve disc, etc. made of ASTM A217 WC6, A217 WC9, A217 C12A or ZG15CrMo, ZG20CrMoV, ZG15Cr1Mo1V and other materials. It is suitable for applications where the nominal pressure is not greater than PN420 (Class2500), high temperature and high pressure check valve with flange and welding connection for steam and water systems of thermal power plants with working temperature greater than 425 and less than or equal to 570C. The valve disc is seated on the valve seat sealing surface of the valve body. Except that the valve disc can rise and fall freely, the rest of the valve disc is like a straight-through globe valve. When the medium flows, the medium pressure causes the valve disc to lift from the valve seat sealing surface. When the medium flow stops, the valve disc automatically falls to the valve seat, cutting off the medium flow. The material selected for this product is chromium-molybdenum steel or chromium-molybdenum vanadium steel whose alloy elements chromium and molybdenum improve high-temperature variable strength. It has excellent hydrogen corrosion resistance and high-temperature oxidation resistance, as well as high high-temperature lasting strength and Creep limit, thus it has been widely used in high temperature and high pressure hydrogen environment.
Parts materials
Specifications
Dimensions
Selection standards for check valves
1. In order to prevent the backflow of the medium, check valves should be installed on equipment, devices and pipelines;
2. Check valves are generally suitable for clean media and are not suitable for media containing solid particles and high viscosity;
3. Generally, horizontal lift check valves should be used on horizontal pipelines with a nominal diameter of 50mm;
4. The straight-through lift check valve can only be installed on horizontal pipelines;
5. For the water pump inlet pipeline, a bottom valve should be used. The bottom valve is generally only installed on the vertical pipe at the pump inlet, and the medium flows from bottom to top;
6. The lifting type has better sealing and greater fluid resistance than the swing type. The horizontal type should be installed on horizontal pipes, and the vertical type should be installed on vertical pipes;
7. The installation position of the swing check valve is not restricted. It can be installed on horizontal, vertical or inclined pipelines. If it is installed on a vertical pipeline, the medium flow direction must be from bottom to top;
8. The swing check valve should not be made into a small-diameter valve. It can be made into a very high working pressure. The nominal pressure can reach 42MPa, and the nominal diameter can also be very large, up to 2000mm or more. Depending on the materials of the shell and seals, it can be applied to any working medium and any working temperature range. The medium is water, steam, gas, corrosive medium, oil, medicine, etc. The working temperature range of the medium is between -196--800℃;
9. The swing check valve is suitable for low pressure and large diameter, and the installation location is limited;
10. The installation position of the butterfly check valve is not restricted and can be installed on horizontal pipelines, or on vertical or inclined pipelines;
Product display
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