Check Valve and flange Gate Valve are the same type of Universal Valve, consisting of an electric actuator or air actuator and a stop valve. The difference is that the valve body is closed, and the valve body is the center line of the valve body. It is a kind of Universal Valve that can open and close. Gate valves are mainly used to cut off, distribute and change the flow direction of media on pipelines. Two-piece ball valves and three-piece ball valves are new Universal Valve that have been widely used in recent years.
For Check Valve, not only can they be installed and maintained, they can also be operated. Opening and closing the Check Valve can stabilize the force and prevent impact. Each component of the high-pressure shut-off valve of a certain impact switch considers that the impact force is not equal to that of a general shut-off valve. When the pipeline is used for the first time, there is a lot of dirt inside, so the cutting valve is slightly opened, using the high-speed flow of the medium to make it flow, closed gently (fast closing, sudden closing to avoid leaving impurities caught on the sealing surface), and then opened again. Clean the dirt repeatedly in this way and return to normal work. Always cut the Universal Valve. There may be stains on the sealing surface. When closing, use the above method to clean it and then officially close it. If the electric actuator is damaged, it must be repaired immediately. Do not use the hand of the actuator to avoid damage to the four sides of the actuator. Some media cool down after the valve is cut off, causing the valve to shrink. The operator must close it again at the appropriate time to avoid leaving a gap on the sealing surface. Otherwise, the medium will flow at high speed from the gaps in the slits and easily erode the sealing surface. During operation, if you find that the operation is too difficult, you should analyze the reasons. If the packaging is too tight, you can loosen it appropriately. If the valve is crooked, contact a repairman. When a certain blocking valve is in a blocked state, the blocking part thermally expands and becomes difficult to open. Please be sure to open it at this time. Please go around the screw of the Universal Valve cover half a turn to remove the stress on the valve and move the plate to the handwheel.
Advantages of Check Valve:
1. Simple structure, convenient to manufacture and maintain.
2. The working stroke is small and the opening and closing time is short.
3. Good sealing performance, small friction between sealing surfaces and long service life.
4. The structural forms of the Check Valve body include straight-through type, DC type and right-angle type. The straight-through type is the most common structure, but it has the greatest fluid resistance. DC fluid resistance is small and is mostly used for fluids containing solid particles or high viscosity. Right-angle valve bodies are mostly forged and are suitable for Check Valve with smaller passages and higher pressures.
5. During the opening and closing process, the friction of the sealing surface is smaller than that of the gate valve and is wear-resistant.
6. Usually there is only one sealing surface, with good manufacturing technology and easy maintenance.
7. The electric actuator is easy to operate.
Working principle: Check Valve, also known as electric cut-off valve, is the most widely used Universal Valve. Unlike electric ball valves, it is popular because of its small friction on the sealing surface during the opening and closing process, high relative durability, and easy opening and closing. Simple and easy to repair, it is not only suitable for medium and low pressure, but also for high pressure. The blocking principle of the Check Valve is to use electric thrust to rotate the valve rod so that the sealing surface of the valve seat and the sealing surface of the valve seat are closely fitted to prevent the flow of the medium. The medium of the Check Valve only flows in one direction, and it is directional when installed. The structural length of the Check Valve is larger than that of the gate valve, the fluid resistance is large, and the reliability of the seal is not strong during long-term operation.
1. When installing the Universal Valve, pay attention to the flow direction of the medium and install it strictly in the direction indicated by the flow arrow of the Universal Valve.
2. The Universal Valve can be installed at any position of the pipeline, and the Universal Valve of carbon steel or alloy steel can be selected according to the medium and the temperature of the medium.
3. The Check Valve should be installed vertically as much as possible with the
Valve Stem pointing upward.
