Self-balancing stop valve with piston type valve core and hidden rod

Abstract

The invention discloses a self-balancing stop valve with a piston type valve core and a hidden rod, which comprises a valve cover (7) and a valve body (33) provided with a front valve cavity (31) and a rear valve cavity (32), wherein a passage (34) is formed between the front valve cavity (31) and the rear valve cavity (32). Guide sleeves (5) in vertical sealed sliding connection and the piston type valve core (2) in which a cavity is formed are arranged in the rear valve cavity (32); the bottom surface (18) of the piston type valve core (2) is used for blocking the passage (34); the guide sleeves (5) are hermetically and fixedly connected with the valve body (33); a lifting component is connected with the piston type valve core (2); the valve cover (7) is hermetically connected with the valve body (33); the inner surfaces of the piston type valve core (2), the guide sleeve (5) and the valve cover (7) encircle an upper chamber (21); and the upper chamber (21) is communicated with the rear valve cavity (32) through a guide pipe component (13). The self-balancing stop valve has the characteristic of remarkable energy-saving effect.

Description

technical field [0001] The invention relates to a cut-off valve, in particular to a piston-type spool concealed rod cut-off valve suitable for high pressure and large diameter. Background technique [0002] In the high-pressure pipeline system, for the shut-off valve with a slightly larger diameter, it needs to add a set of huge actuators to control its opening and closing, which will increase the cost and energy consumption of the valve. [0003] In order to solve the above-mentioned technical problems, people have made the following technical improvements, for example: [0004] The pilot piston cut-off valve announced by Chinese utility model patent CN2866989Y is provided with a piston chamber on the flow path between the water inlet and the water outlet of the valve body. The piston chamber is equipped with a piston body with a spring, and a valve is installed on the upper part of the piston chamber. Cover, there is a long water hole in the valve cover, the two ends of t...

AI Technical Summary

Problems solved by technology

The main disadvantages of this valve are: the processing of the pilot hole is difficult, and once the pilot hole is blocked, it is difficult to clean it, which affects the normal opening and closing performance of the valve; when the liquid pressure in the flow channel fluctuates, the piston will jump up and down, and the seal is not reliable

The main disadvantages of this valve are: when the liquid pressure in the flow channel fluctuates, the piston will jump up and down, resulting in internal leakage of the liquid, low stability, unreliable sealing, and cannot be used for piping systems that require high safety levels. this valve

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