Low-temperature high pressure balancing plug valve

Abstract

The invention provides a low-temperature high pressure balancing plug valve. The low-temperature high pressure balancing plug valve consists of a supporting seat and a valve main body part positioned on the supporting seat, wherein the valve main body part comprises a valve body and a top cap; a cavity is formed in the valve body in the vertical direction, a plug cock is arranged in the cavity, a ball is arranged below the plug cock, and a middle passage through which liquid flows is formed in the length direction of the valve body; a check valve, a grease filling valve, a valve rod and a filler box are arranged on the top cap; the valve rod is connected with the plug cock, and the plug cock can be driven by the rotation of the valve rod to open or close the middle passage; the check valve is arranged between the valve rod and the plug cock and used for preventing the pressure of the upper cavity from refluxing; the grease filling valve arranged on the top cap is communicated to the cavity and used for filling lubricating grease; and a flat key is also arranged on the top cap. The plug valve can achieve effective sealing and realize small-torque opening; and moreover, special alloy is surfaced on the sealing face, hard sealing of metal is implemented, and the sealing endurance is ensured.

Description

technical field [0001] The present invention relates to a low-temperature, high-pressure, pressure-balanced plug valve (hereinafter referred to as plug valve), in particular to a kind of low-temperature, high-pressure, pressure-balanced, metal-hard-sealed, and corrosion-resistant plug valves of various types above 24″-900Lb. Large diameter low temperature high pressure pressure balanced metal hard seal plug valve. Background technique [0002] The plug valve is a closing member or a plunger-shaped rotary valve. By rotating a certain angle, the channel opening on the valve plug is consistent with or staggered with the channel opening on the valve body to realize opening or closing. The shape of the valve plug of the plug valve can be cylindrical or conical. In cylindrical plugs, the passageways are generally rectangular. In a tapered plug, however, the passageway is trapezoidal. These shapes make the structure of the plug valve light, but at the same time, it also produces...

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Problems solved by technology

However, the oilfield water injection medium is a corrosive medium, and it is easy to contain impurities such as sediment

The sealing surface of the ball valve is only the spherical surface and the annular surface of the valve body sealing surface, the sealing surface is small, and its sealing pair is a soft seal.

After long-term corrosion of high-pressure impurity-containing corrosive media, a large amount of impurities are deposited on the body cavity and spherical surface of the valve body, and the sealing surface of the ball is damaged during the opening and closing process, and the sealing performance cannot be maintained for a long time, resulting in high cost of use

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