Method for preventing shutter malposition of gate valve

Abstract

The invention provides a method for preventing malposition of the flashboards of a gate valve, which comprises the steps as follows: A: associated elements are arranged between the flashboards for blocking a flow passage of the gate valve; B: the flashboards provided with the associated elements are assembled with block pieces and valve rods to form a valve spool; C: the valve spool obtained in step B is installed into a valve body matched with the valve spool; and D: a valve cover and a spider handle thereof, which are corresponding to the valve body, are installed. The method has advantages that: the associated elements are arranged between two relatively independent flashboards to guarantee the synchronous movement of the two flashboards without making any malposition or separation, therefore can guarantee the reasonable positions of the block pieces so as to prolong the service life of the gate valve, besides, the associated elements are arranged between the flashboards, thus being favorable for improving the integrity of the valve spool, simplifying the operation process for dismantling and installing the valve spool when maintaining pipelines, and promoting working efficiency.

Description

【Technical field】 [0001] The invention relates to a gate valve used for pipelines, in particular to a method for preventing the dislocation of gate valves of the gate valve. 【Background technique】 [0002] The existing gate valve with double rams and rising rods for pipelines has two rams for blocking the liquid flow channel, and the two rams are independent of each other. When assembling the gate valve, the block sleeve is hung on one end of the valve stem, and then placed between the two gates. The operator holds the gate with both hands to make the two gates fit together easily, and another operator cooperates to lift the valve. The core assembly, align the gate plate with the double groove of the valve body, and put the valve core assembly composed of the gate plate, the wedge block and the valve stem into the valve body. This gate valve is made of cast iron. In the process of use, the edge of the gate or the edge of the double groove in the valve body will wear 1-2mm o...

AI Technical Summary

Problems solved by technology

This gate valve is made of cast iron. In the process of use, the edge of the gate or the edge of the double groove in the valve body will wear 1-2mm or the edge will be cracked and missing a small corner of a few millimeters, and the gate will easily fall out of the limit of the valve body. Double slots, misalignment between the two gates, causing the wedge and the gate to fall apart, resulting in the failure of the gate valve

In addition, this kind of gate valve brings a burden to the operator during the operation of removing debris from the valve core. The two separate gates need to be installed by two operators, and it is difficult for one person to complete the entire assembly work.

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