The difference between globe valve and check valve

The stop valve is a commonly used cut-off valve. It is mainly used to connect or cut off the medium in the pipeline. It is generally not used to regulate the flow. Globe valves are suitable for a wide range of pressures and temperatures, but are generally used for medium and small diameter pipelines. A globe valve is a valve in which the closing member (disc) moves along the centerline of the valve seat. The stop valve is mainly used for cutting off in the pipeline. Globe valve has the following advantages: 1． During the opening and closing process, the friction of the sealing surface is smaller than that of the gate valve and is wear-resistant. 2． The opening height is small. 3． Usually there is only one sealing surface, the manufacturing process is good, and it is easy to maintain. Globe valves are commonly used, but due to the large opening and closing torque and long structural length, the nominal diameter is generally limited to DN≤200mm. The fluid resistance loss of the stop valve is relatively large. This limits the wider use of stop valves. Check valve working principle, advantages, scope of application Check valve refers to a valve that relies on the flow of the medium itself to automatically open and close the valve disc to prevent the medium from flowing back. It is also called a check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve whose main function is to prevent the backflow of the medium, the reverse rotation of the pump and drive motor, and the release of the container medium. Check valves may also be used on lines supplying auxiliary systems where the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis). The function of this type of valve is to only allow the medium to flow in one direction and prevent flow in one direction. Usually this kind of valve works automatically. Under the pressure of fluid flowing in one direction, the valve disc opens. ； When the fluid flows in the opposite direction, the fluid pressure and the self-weight of the valve disc act on the valve seat to cut off the flow. Among them, check valves belong to this type of valve, which include swing check valves and lift check valves. The swing check valve has a hinge mechanism and a door-like valve disc that freely rests on the inclined seat surface. In order to ensure that the valve disc can reach the appropriate position of the valve seat surface every time, the valve disc is designed in the hinge mechanism so that the valve disc has enough swing space and makes the valve disc truly and comprehensively contact the valve seat. The valve flap can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic coverage on the metal, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can rise and fall freely, the rest of this valve is like a stop valve. The fluid pressure causes the valve disc to lift from the sealing surface of the valve seat. The backflow of the medium causes the valve disc to fall back to the valve seat and cut off the flow. Depending on the conditions of use, the valve disc can be an all-metal structure, or it can be inlaid with a rubber pad or rubber ring on the valve disc frame. Like the stop valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is rarely restricted. This post was last edited by Xidu Ouyangfeng on 2009-2-5 00:45 ]

Stop valve is used to regulate flow or throttling. The check valve prevents the medium from flowing in the opposite direction, that is, backflow.

Stop valve is mainly used to regulate flow； Check valves can be divided into two types: one is installed vertically and the other is installed horizontally. Its main function is to prevent the backflow of materials or gases and affect the production stability of the system.

The stop valve is used to connect or cut off the medium in the pipeline and can adjust the flow rate. Requires power to operate. 1 |8 r6 R$ F) t The check valve prevents the reverse flow of the medium in the pipeline. It is divided into swing type and lift type and does not require external force to operate.

The best way to solve the two problems is to go to the factory and have a look. Pushing the check valve by hand is much more intuitive than reading a book or something.

Haha, what the 6th floor said is good, look at the real thing and use your hands. . . . Much better than words. . . .

The stop valve is a type of shut-off valve that can (manually) adjust the flow rate； As the name suggests, a check valve is a valve that allows fluid to flow in one direction and prevents backflow.

Valves can be divided into automatic valves and driven valves. Check valves are automatic valves that operate on their own through the medium itself. The stop valve is a type of driven valve that controls the opening and closing of the valve through manual, electric, pneumatic or hydraulic power.

It seems that the author is new to the chemical industry: loveliness: The stop valve and the check valve are two completely different valves. The function of the stop valve is to adjust the flow of the pipeline medium, and it is two-way, while the check valve has no function of adjusting the flow. It is one-way, and the flow direction of the pipeline medium is irreversible.

There is also manual operation of the stop valve, but the check valve is automatic without operation.

The stop valve is used to adjust the flow and cannot stop the flow.； The check (return) valve is a one-way flow valve that only allows flow in the direction of the arrow and does not allow reverse flow (there is an arrow on the valve)!

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