Let's learn about the purpose of Gate Valve

September 04, 2024

Universal Valve are safety protection devices on equipment, devices and pipelines to prevent the pressure of the medium in the equipment, devices and pipelines from exceeding the specified value. When the working pressure in the equipment, devices and pipelines exceeds the specified value, the Gate Valve will close automatically and prevent the medium in the device from continuing to flow out.

Since the Gate Valve is an automatic valve, it has many differences from the Universal Valve in terms of mechanism and performance parameters. Some professional terms are easy to confuse. In order to enable readers to understand the Gate Valve more clearly and choose it correctly, some main terms are explained below.

1. Gate Valve: an automatic valve that does not use any external force, but uses the force of the medium itself to discharge a rated amount of fluid to prevent the pressure in the system from exceeding the predetermined safety value. When the pressure returns to normal, the valve closes again and prevents the medium from continuing to flow out.

2. Direct load Gate Valve: a Gate Valve that directly uses a mechanical load such as a weight, a lever plus a weight or a spring to overcome the force generated by the medium pressure under the valve disc.

3. Gate Valve with power assist device: This Gate Valve can be opened at a lower opening pressure than normal with the help of a power assist device. Even if the assist device fails, this type of valve should still meet the standard requirements.

4. Gate Valve with supplementary load: This Gate Valve always maintains an additional force to enhance the seal before the pressure at its inlet reaches the opening pressure. The additional force (supplementary load) can be provided by an external energy source, and should be reliably released when the Gate Valve reaches the opening pressure. Its size should be set so that, assuming that the additional force is not released, the Gate Valve can still reach the rated displacement under the premise that the inlet pressure does not exceed the percentage of the opening pressure specified by the national law.

5. Pilot Gate Valve: A Gate Valve that is driven or controlled by discharging the medium from the pilot valve. The pilot valve itself should be a direct load Gate Valve that meets the standard requirements.

6. Opening pressure (set pressure): The inlet pressure when the Gate Valve disc opens and rises under operating conditions. At this pressure, there begins to be a measurable opening height, and the medium is in a continuous discharge state that can be perceived visually or auditorily.

Author:

Mr. Jim

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