Two-section nonrising stem flat valve with switch indicator

Abstract

The invention discloses a two-section non-rising stem flat valve with a switch indicator. The two-section non-rising stem flat valve with the switch indicator consists of a handwheel assembly, a switch indicating part, a support rotating part, valve rod parts, a seal lubrication part, a nut, a wedge disc, a valve seat assembly and a valve body. Two sections of valve rod parts connected by a cylindrical pin are particularly adopted; the switch indicating part is arranged between the handwheel assembly and the support rotating part; and the middle of the valve body is processed into a cavity in which two rounds clamp a cuboid, namely the cavity has hollow cylinders on upper and lower parts, and a hollow cuboid in the middle. The technical means can reduce the moment of resistance generated by different axialities among parts and pressure difference on the wedge disc, and is convenient for an operator to observe the opening or the closing of the valve; and two opposite nearest sides of the hollow cuboid in the valve cavity increase the wall thickness of the valve body and increase the insertion depth of the valve seat into an inner wall hole so as to improve the stability of the valve seat, reduce the abrasion of the parts, prolong the service life of the valve and make the valve opened or closed easily and quickly.

Description

technical field [0001] The invention relates to the innovative design of a "manual concealed rod flat valve" in petroleum machinery and oil (gas) field wellhead equipment. Background technique [0002] Manual hidden rod flat plate valve is a large-diameter gate valve commonly used in oil well production equipment and wellhead devices. The oil flowing in the valve requires good sealing performance, long service life and small opening and closing torque. However, there are three problems in the use of the existing manual concealed rod flat valve: one is to use a complete valve rod part, which is suspended from top to bottom to cooperate with many parts, and the error of many parts is not axial. , so that the valve stem is easily hindered when it rotates; in addition to the large diameter of the valve, the gate plate located at the lowermost end of the valve stem has a large impact on the suspended valve stem under the working pressure difference between the oil inlet and the o...

AI Technical Summary

Problems solved by technology

However, there are three problems in the use of the existing manual concealed rod flat valve: one is to use a complete valve rod part, which is suspended from top to bottom to cooperate with many parts, and the error of many parts is not axial. , so that the valve stem is easily hindered when it rotates; in addition to the large diameter of the valve, the gate plate located at the lowermost end of the valve stem has a large impact on the suspended valve stem under the working pressure difference between the oil inlet and the oil outlet. The offset torque makes it more difficult to open and close the manual concealed rod flat valve

The second is that the valve stem, nut and gate move in the valve body, and the degree of opening and closing cannot be observed from the outside, making it difficult to accurately control oil well production and prone to misoperation

The third is that when the forged valve body is used, it is customary and convenient to process a cylindrical cavity in the middle to install a flat gate; two holes are processed on the inner wall of the cavity on both sides of the gate to install two circular valves. Tubular valve seat; because the width of the gate is much greater than its thickness, the cavity diameter of the valve body is large, the wall thickness between the inner and outer circles is small, and the vertical distance from the inner wall of the cavity to the side of the gate is relatively long, so that the seat inserts The depth of the hole in the inner wall of the valve is limited, and the suspended part is long, coupled with the existence of motion gap and frictional moment, it is easy to cause the valve seat to shake and jam, thereby accelerating the wear between parts and affecting its sealing performance and service life

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