Gate valve with invisible stealing opening preventing function

Abstract

The invention discloses a gate valve with an invisible stealing opening preventing function. The gate valve comprises a valve body, a valve cover connected to the valve body, a pressure cover connected to the valve cover and a valve rod capable of rotating to further control a rubber plate to move up and down. The gate valve is characterized in that the valve rod comprises an upper valve rod and alower valve rod, the lower valve rod is rotatably connected to the valve cover, the lower end of the lower valve rod is connected to the rubber plate, a first hole and a special-shaped groove communicating to the first hole are formed in the upper end of the lower valve rod, the first hole and the lower valve rod are coaxial, a spring is arranged in the first hole, a connecting block is slidablyarranged in the special-shaped groove in a fit manner, and the spring is acted to the connecting block; the upper valve rod is rotatably mounted on the pressure cover through a pressure ring, a hand wheel is mounted on the upper valve rod in a sleeving manner, a second hole coaxial to the upper valve rod is formed in the upper valve rod, and a thread is arranged in the middle of the second hole. The gate valve is consistent to a common gate valve in appearance. Risks that a special anti-theft valve which is mounted is manually destroyed and a special tool is copied to open the gate valve can be reduced effectively. The gate valve has relatively high safety performance.

Description

technical field [0001] The invention relates to a gate valve with an invisible anti-theft opening function, which belongs to the technical field of valves. Background technique [0002] The gate valve is an opening and closing gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed. is 2°52'. To improve its manufacturability and make up for the deviation of the sealing surface angle during processing, this gate is called an elastic gate. [0003] When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate must be forced against the valve seat by external force to ensure the tightn...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages in the prior art that the anti-theft opening device of the valve can be seen at a glance from the appearance, and the special tools used are easy to be imitated and the valve is easy to be damaged, which makes the gate valve less safe. A gate valve with invisible anti-theft opening function. The appearance of the gate valve is the same as that of ordinary gate valves, which can effectively reduce the risk of the special anti-theft valve being opened by man-made damage or imitation special tools, and has high safety performance.

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