A Large Diameter Inclined Check Valve

Abstract

The invention relates to the field of valves, in particular to a large-caliber inclined check valve. The large-caliber inclined check valve comprises a valve body, a valve holder, a valve clack and a pin shaft; the valve clack is linked with the pin shaft; a hydraulic buffer device is arranged at the outer part of the valve body and comprises a starting part, a shell and a hydraulic cavity arranged in the shell; a liquid pushing mechanism, hydraulic liquid and fluid passages are arranged in the hydraulic cavity; the liquid pushing mechanism divides the hydraulic cavity into more than two hollow cavities; the fluid passages are communicated with all hollow cavities; the liquid pushing mechanism prompts the hydraulic liquid in each hollow cavity to pass by the fluid passages and perform flowing and replacing in each hollow cavity; the liquid pushing mechanism and the pin shaft are linked; the hydraulic liquid generates different flow changes by passing different fluid passages in the liquid pushing process due to the incompressibility of the hydraulic liquid, so the two stages of fast and slow rotation of the liquid pushing mechanism are realized.

Description

technical field [0001] The invention relates to a valve, in particular to a large-diameter inclined check valve with a hydraulic buffer device for petrochemical industry. Background technique [0002] Traditional large-diameter check valves for petrochemical working conditions are usually swing check valves assembled from valve body, valve seat, valve disc, pin shaft and other parts, and are installed on the transmission pipeline of petrochemical equipment for automatic protection. The purpose of the reverse flow of the working medium in the pipeline is completed by the working medium pushing the valve disc to rotate along the pin shaft. When the medium passes through in the forward direction, the positive impact force of the medium can make the valve disc rotate and open to allow the medium to flow through. When the medium flows backwards, due to the gravity of the disc itself, the disc will return to the normal position, thereby realizing the closure of the check valve. Th...

AI Technical Summary

Problems solved by technology

[0002] Traditional large-diameter check valves for petrochemical working conditions are usually swing check valves assembled from valve body, valve seat, valve disc, pin shaft and other parts, and are installed on the transmission pipeline of petrochemical equipment for automatic protection. The purpose of the reverse flow of the working medium in the pipeline is completed by the working medium pushing the valve disc to rotate along the pin shaft. When the medium passes through in the forward direction, the positive impact force of the medium can make the valve disc rotate and open to allow the medium to flow through. When the medium flows backwards, due to the gravity of the disc itself, the disc will return to the normal position, thereby realizing the closure of the check valve. The common problem of this kind of swing check valve in use is: back flow When it is closed, it is very easy to cause a dangerous water hammer phenomenon in which the pressure rises sharply to several times or even ten times higher than the normal pressure, which will cause serious consequences for the destruction of pipelines and pump valves.

1. When the large-diameter check valve is closed in reverse flow, it is very easy to cause a dangerous water hammer phenomenon in which the pressure rises sharply to several times or even ten times higher than the normal pressure, which will cause serious consequences for the destruction of pipelines and pump valves; 2. Due to The sealing pair of the valve is a flat seal, and the sealing force only comes from the automatic return pressure of the working medium of the valve, which cannot reach the necessary sealing specific pressure, poor sealing performance, and easy to leak; leakage

Images