Selection and maintenance tips of straight-through check valve
Home ✦
Latest News ✦
Selection and maintenance tips of straight-through check valve
Selection and maintenance tips of straight-through check valve
The straight-through check valve is a component that prevents gas or liquid from flowing back. Below, I will introduce its purchase method and maintenance points.
1. How to choose a straight-through check valve
1. Straight-through check valves are generally suitable for clean media and are not suitable for media containing solid particles and high viscosity.
2. For low-pressure check valves below DN50mm, butterfly check valves, vertical lift check valves and diaphragm check valves should be used; for medium and low-pressure check valves of DN200-DN1200, spherical return check valves should be used; for high-pressure check valves of DN50-DN2000, butterfly check valves or diaphragm check valves should be used.
3. Diaphragm check valve is more suitable for use in pipelines that are prone to water hammer. Diaphragm check valve is generally used in low-pressure and normal-temperature pipelines because it can effectively eliminate the water hammer phenomenon caused by medium backflow, but its use is limited by temperature and pressure.
4. For pipelines that require relatively small or no water hammer when closing, it is recommended to purchase slow-closing swing check valves and slow-closing butterfly check valves.
2.Maintenance points of straight-through check valve
1. Ensure that the straight-through check valve has sufficient control pressure, and do not allow the control pressure to be lost. Pay attention to whether the control pressure meets the requirements for reverse opening. If the control pressure is derived from the main system, analyze the impact of the change in the main system pressure on the control oil circuit pressure to avoid malfunction.
2. During maintenance, pay attention to the direction of the inlet and outlet to ensure correct installation. Do not install it upside down, otherwise it will affect the normal operation of the piping system.
After a long period of operation, the straight-through check valve will inevitably have some faults, so we need to repair it. The above points should be mastered during maintenance.
1. How to choose a straight-through check valve
1. Straight-through check valves are generally suitable for clean media and are not suitable for media containing solid particles and high viscosity.
2. For low-pressure check valves below DN50mm, butterfly check valves, vertical lift check valves and diaphragm check valves should be used; for medium and low-pressure check valves of DN200-DN1200, spherical return check valves should be used; for high-pressure check valves of DN50-DN2000, butterfly check valves or diaphragm check valves should be used.
3. Diaphragm check valve is more suitable for use in pipelines that are prone to water hammer. Diaphragm check valve is generally used in low-pressure and normal-temperature pipelines because it can effectively eliminate the water hammer phenomenon caused by medium backflow, but its use is limited by temperature and pressure.
4. For pipelines that require relatively small or no water hammer when closing, it is recommended to purchase slow-closing swing check valves and slow-closing butterfly check valves.
2.Maintenance points of straight-through check valve
1. Ensure that the straight-through check valve has sufficient control pressure, and do not allow the control pressure to be lost. Pay attention to whether the control pressure meets the requirements for reverse opening. If the control pressure is derived from the main system, analyze the impact of the change in the main system pressure on the control oil circuit pressure to avoid malfunction.
2. During maintenance, pay attention to the direction of the inlet and outlet to ensure correct installation. Do not install it upside down, otherwise it will affect the normal operation of the piping system.
After a long period of operation, the straight-through check valve will inevitably have some faults, so we need to repair it. The above points should be mastered during maintenance.
