Check flushing valve capable of changing flushing directions automatically

Abstract

A check flushing valve capable of changing flushing directions automatically comprises a valve body and a valve core. A valve seat is arranged in a valve cavity on the inner side of the inlet of the valve body, a valve core seal end in the valve cavity is sealed with the valve seat correspondingly, the other end of the valve core is a guide rod matching with an end cover through hole of the valve body, a return spring is arranged between the end cover and the valve core, the side face of the guide rod is provided with a flushing port, and the flushing port is communicated with the valve cavity through the valve core and a guide rod inner channel. The check flushing valve is characterized in that a front positioning seat is arranged on the periphery of the valve seat in the valve cavity, the valve core is provided with a boss around the same, two ends of the boss are provided with end face teeth with same tooth indexes, the front end of the boss and the front positioning seat are provided with front end face teeth engaged with a symmetrical bevel, and the rear end of the boss and a rear positioning seat on the inner side of the end cover are provided with rear end face teeth engaged with a single bevel; the front end face teeth are engaged, the rear end face teeth are staggered, and the staggering angle is smaller than the tooth index and larger than half of the tooth index. The check flushing valve has the advantages that flushing range can be increased, sediment fixing a pile can be flushed fastly, pile pulling resistance is decreased, and pile raising efficiency is improved.

Description

technical field [0001] The invention relates to a check jet flushing valve, in particular to a jet flushing valve for flushing the sediment around a pile body during the pile pulling operation of an offshore mobile drilling platform. Background technique [0002] like figure 1 As shown, the existing conventional flushing valve is to connect the A end of the valve body 1 with the high-pressure flushing water pipe. When working, the high-pressure water pushes the valve core 3 away, so that the injection port C protrudes and is in the working position: at this time, the return spring 5 is compressed, and the sealing part B is opened at the same time: the high-pressure water flows through the inner channel of the valve core 3, and is flushed by four jets. Outlet C sprays out to wash away the sediment on the fixed pile body and reduce the pile pulling resistance. When the high-pressure water loses pressure, the spool 3 resets under the action of the back-moving spring 5, and th...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a non-return spray valve with automatic conversion of the spray direction, aiming to solve the problem of small sand washing range and low efficiency of conventional spray valves currently in use

Images