Water-resistant butterfly valve and method for low-lying position of large-fall oil conveying pipeline

Abstract

The invention relates to a water-resistant butterfly valve and method for a low-lying position of a large-fall oil conveying pipeline. The butterfly valve is arranged at the low-lying risk pipe section of the pipeline, when the pipeline has dangerous working conditions such as leakage and the like, the butterfly valve plays a role in emergency shutdown of the accident pipe section, and is composedof a handle torque direction changing and dispersing unit, a valve rod gear transmission rate limiting unit and a valve rod torque magnitude control unit, aiming at the water hammer problem caused bythe sudden change of crude oil flow rate and pressure mutation in the pipeline caused by the quick closure of butterfly valve in low-lying position of oil pipelines by operators, the butterfly valveis designed according to the three aspects of the torque reduction of the butterfly valve handle, the limit of the transmission rate of the valve rod and the control of the transmission torque of thevalve rod, so that the force application of the operator to the handle can be reduced in the valve closing process, the rotating speed of the valve rod and the stress of the control valve rod are limited, the applicability of the butterfly valve at the low-lying position of the large-pipe-diameter oil conveying pipeline is improved, so that the valve closing rate is controlled within a reasonablerange to avoid the water hammer phenomenon, and the service life of the butterfly valve is prolonged.

Description

technical field [0001] The invention relates to a butterfly valve and a method for waterproofing a shock-proof butterfly valve at a low-lying place of a large-drop oil pipeline, and belongs to the technical field of long-distance pipeline transportation of crude oil and refined oil. Background technique [0002] Long-distance oil pipelines carry high pressure. When they pass through natural barriers such as hills and mountains, they are laid according to the terrain to form a V-shaped pipe section with a large drop. High-pressure crude oil impacts low-lying places along the downhill pipe section with a large drop, which is prone to risks such as pipeline corrosion, perforation, fracture and leakage. . Butterfly valves are usually installed in low-lying places of oil pipelines to cut off and throttle when high-risk operating conditions or accidents occur in the pipeline. [0003] The butterfly valve controls the flow area of ​​the pipeline by rotating the valve disc in the p...

AI Technical Summary

Problems solved by technology

[0015] (1) Aiming at the problem that the rotation speed of the valve stem is too large during the closing process of the butterfly valve, the transmission speed of the valve stem is limited by designing gear plates with different gear ratios and sizes;

Images