Views: 15 Author: Site Editor Publish Time: 2022-04-07 Origin: Site
The purpose of using a check valve is to prevent the reverse flow of the medium, and a check valve is generally installed at the outlet of the pump. In addition, a check valve should also be installed at the outlet of the compressor. In short, in order to prevent the reverse flow of the medium, a check valve should be installed on the equipment, device or pipeline.
Generally, lift check valves are used on horizontal pipelines of nominal size DN50. Straight-through lift check valve can be installed on both horizontal and vertical pipelines. The foot valve is generally only installed on the vertical pipeline of the pump inlet, and the medium flows from bottom to top.
The swing check valve can be made into a very high working pressure, up to PN420, and the nominal size can also be large, up to DN2000 or more. According to the different materials of the body and seal, it can be applied to any working medium and any working temperature range. The medium is water, steam, gas, corrosive medium, oil, food, medicine, etc. The medium operating temperature range is -196 ~ 800oC.
The installation position of the swing check valve is not limited, it is usually installed on the horizontal pipeline, but it can also be installed on the vertical pipeline or the inclined pipeline.
The ball check valve has good sealing performance, reliable operation and good water hammer resistance because the seal is a sphere covered with rubber; and because the seal can be a single ball or multiple balls, it can be made into a large size. However, its seal is a hollow sphere covered with rubber, which is not suitable for high-pressure pipelines, but only suitable for medium and low-pressure pipelines.
Since the body material of the ball check valve can be made of stainless steel, and the hollow sphere of the seal can be covered with PTFE engineering plastic, it can also be used in pipelines with general corrosive media.
The working temperature of this type of check valve is -101~150oC, its nominal pressure is <PN40, and its nominal size range is DN200 ~ DN2000.
More details of check valves, please go to https://www.mingpinmetals.com/Check-Valve-pl3017724.html