Ball screw gate valve

Abstract

The invention discloses a ball screw gate valve convenient to open and close. The ball screw gate valve comprises a valve body. A channel, a valve seat and a valve plate are arranged in the valve body. An upper valve cover is arranged at the upper end of the valve body, a lower valve cover is arranged at the lower end of the valve body, and a grease injection valve is respectively arranged on the upper valve cover and the lower valve cover. A base is arranged at the lower end of the lower valve cover, a tail rod is connected with the lower end of the valve plate, a tail rod base is arranged at the lower end of the tail rod, and the tail rod base is arranged in the base. A support is arranged at the upper end of the upper valve cover, a packing gland is arranged between the support and the upper valve cover, and a ball screw pair is arranged in the support. A hand wheel rod is arranged at the upper end of the ball screw pair, the upper end of the hand wheel rod is connected with a hand wheel, a ball screw base is arranged at the lower end of the ball screw pair, a bearing support is arranged in the support between the ball screw base and the packing gland, the lower end of the ball screw base is connected with the lower end of a valve rod, and the lower end of the valve rod is connected with the valve plate.

Description

technical field [0001] The invention relates to a petroleum machinery, in particular to a ball screw gate valve. Background technique [0002] In the process of oil extraction, the gate valve is used as a cut-off medium, and the whole flow is straight through when it is fully opened, and the pressure loss of the medium operation is the smallest at this time. Gate valves are generally suitable for working conditions that do not require frequent opening and closing, and keep the gate fully open or fully closed. Not suitable for regulating or throttling use. After the diameter and pressure of the ordinary trapezoidal thread transmission gate valve reach a certain specification, it is difficult to switch on and off manually, which cannot meet the production demand. The Ball Screw Gate Valve is a large bore, high pressure gate valve that is an integral part of the frac tree. Frac valves are typically used on the top of the wellhead on high-pressure oil wells to complete the fr...

AI Technical Summary

Problems solved by technology

The Chinese patent discloses several ball screw gate valves, but in actual use on site, due to unreasonable structural design, the number of turns of fully open and fully closed is inversely proportional to the relationship between the operating torque under pressure, that is, fully open and fully closed. The number of fully closed turns is small, but it is laborious to turn the handwheel, or the number of fully opened and fully closed turns is large, and it is easy to turn the handwheel

During the production process of these kinds of existing gate valves, the user has brought invariance and reduced work efficiency.

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