Check valve capable of controlling fast and slow closing by means of variable throttle

Abstract

The invention relates to a check valve capable of controlling fast and slow closing by means of a variable throttle and, more particularly, to a check valve capable of controlling fast and slow closing by means of a variable throttle, the valve being operated as a fast closing with high speed at the time of an initial closing of the valve, and then operated as a slow closing with low speed by means of a buffering damper, thereby being capable of preventing water impact as well as noise and vibration.

Description

technical field [0001] The present invention relates to a check valve that can adjust fast closing and slow closing by means of variable throttling. The buffer damper performs slow closing operation, so not only noise and vibration can be prevented, but also water hammer can be prevented. Background technique [0002] Generally speaking, when the pump of the water piping system stops suddenly or the valve locks quickly, there will be a transient phenomenon (Transient Condition) in which the flow rate and flow pressure change rapidly. This phenomenon is called water hammer or water hammer phenomenon (Water Hammer). [0003] As a result of this water hammer, the pressure in the piping rises sharply or the pressure in the piping drops below the saturated vapor pressure of water to generate steam, which may cause damage to the piping due to shock waves during the recombination (Column Separation & Return) process. crumbled or broken. [0004] For example, water piping systems ...

AI Technical Summary

Problems solved by technology

[0009] But as mentioned above, in order to prevent problems such as noise, vibration and water hammer when closing quickly, the existing check valve implements the slow closing action that the cover plate 30 is slowly closed, but it cannot be completely closed after taking the slow closing method. Provides the inherent function of the check valve to prevent fluid backflow

[0010] That is, if the time for the cover plate 30 to fully descend and close the flow path is too long, during this period of time fluid (i.e., water) will flow in a large amount in the reverse flow direction and cannot realize the inherent function of the check valve, and will also Applying pressure to the stopped supply pump 2 is the cause of failure

[0011] Therefore, in order to realize the inherent function of the check valve, noise, vibration, and water hammer will occur when the quick closing action is implemented. In order to solve the problems caused by the quick closing action, the fluid backflow will increase when the slow closing action is implemented. phenomenon, in short, both ways can cause problems

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