From Principle, Classification to Application, Detailed Introduction of Check Valve
From Principle, Classification to Application, Detailed Introduction of Check Valve
High pressure check valve is to rely on the flow of the medium itself and automatically open and close the valve disc, to prevent the reverse flow of medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. Check valve is a kind of automatic valve. Its main function is to prevent the reverse flow of medium, reverse rotation of pump and drive motor, and discharge of container medium. The check valve can also be used to supply the auxiliary system in which the pressure may rise above the system pressure.
Check valve is a device direction that only allows the medium to flow in it. They don't ask the user or the actuator to run because they work automatically according to the pressure in the system. Spring type in-line check valve is the most common, other commonly used types are: swing check valve, lift check valve, ball check valve and duckbill valve. Check valve is mainly used to prevent pollution and equipment damage when the medium flows backward.
Since the check valve operates without users, a differential pressure is required to operate. Higher upstream pressure is required for flow from inlet to outlet through the valve. The minimum difference between the valve inlet and outlet is known as the "cracking pressure" and varies depending on the valve size and design. If the pressure on the outlet side is high, the flow will attempt to move backward through the check valve. It is designed to close due to this "back pressure".
Since the check valve allows one-way flow, it must be installed in the correct direction. Usually, the arrow clearly describes the direction. If installed backward, the media will not be able to move the valve in the required direction of flow.
Depending on the design of the valves, they work in slightly different ways. Spring loaded in-line check valves are the most common. However, other common types are listed below. There are other types of special features, such as inlet filters, flexible diaphragms, or mechanical override levers, but they are less common.
Spring type check valve is simple in design and is the most commonly used check valve. This valve has a spring under the disc to help close. When the medium flows into the valve inlet, the pressure needs to be greater than the spring force (opening pressure). When the inlet pressure is less than the spring force (no inlet pressure or back pressure), the disc will seal the opening to prevent medium flow. For inspection and maintenance, the valve needs to be completely removed from the production line.
Check valve is a device direction that only allows the medium to flow in it. They don't ask the user or the actuator to run because they work automatically according to the pressure in the system. Spring type in-line check valve is the most common, other commonly used types are: swing check valve, lift check valve, ball check valve and duckbill valve. Check valve is mainly used to prevent pollution and equipment damage when the medium flows backward.
Since the check valve operates without users, a differential pressure is required to operate. Higher upstream pressure is required for flow from inlet to outlet through the valve. The minimum difference between the valve inlet and outlet is known as the "cracking pressure" and varies depending on the valve size and design. If the pressure on the outlet side is high, the flow will attempt to move backward through the check valve. It is designed to close due to this "back pressure".
Since the check valve allows one-way flow, it must be installed in the correct direction. Usually, the arrow clearly describes the direction. If installed backward, the media will not be able to move the valve in the required direction of flow.
Depending on the design of the valves, they work in slightly different ways. Spring loaded in-line check valves are the most common. However, other common types are listed below. There are other types of special features, such as inlet filters, flexible diaphragms, or mechanical override levers, but they are less common.
Spring type check valve is simple in design and is the most commonly used check valve. This valve has a spring under the disc to help close. When the medium flows into the valve inlet, the pressure needs to be greater than the spring force (opening pressure). When the inlet pressure is less than the spring force (no inlet pressure or back pressure), the disc will seal the opening to prevent medium flow. For inspection and maintenance, the valve needs to be completely removed from the production line.
