Tapered-surface reversing rotary valve

Abstract

The invention relates to a tapered-surface reversing rotary valve and belongs to the technical field of fluid pressure transmission. The tapered-surface reversing rotary valve has the main technical characteristics that radial force and axial force acting on a valve core by fluid are balanced, and the valve core and a valve seat are in close fit under the action of a compression spring force; a rotational torque mainly depends on spring pressure and is independent of fluid pressure; the rotary valve can be designed as a two-position valve with different functions or a three-position valve with different functions; the rotary valve can be manual or electric and can also be a valve group. The tapered-surface reversing rotary valve has automatic wear compensation, the seal between internal high pressure and internal low pressure of the valve is gapless spaced seal, the internal leakage is little or zero, the service life is super-long and can reach up to several million times, and the tapered-surface reversing rotary valve has the performance of being applicable to any fluid. According to the tapered-surface reversing rotary valve, a three-position four-way valve with the coded name of Y-valve is taken as an example, the structure of a valve / valve group is introduced, and the valve core structures of eleven kinds of relatively-common three-position four-way valves with different functions and one kind of three-position six-way valve and the valve group structure of the three-position four-way valve with the coded name of Y-valve are designed and drawn.

Description

technical field [0001] The invention is used for a steering reversing mechanism in fluid pressure transmission, and belongs to the technical field of fluid pressure transmission components. Background technique [0002] 1. Current technical status [0003] The reversing valves currently used in production are classified according to the power source, and there are manual reversing valves and electromagnetic reversing valves. For example, according to the high and low pressure sealing forms inside the spool, it can be divided into gap seals and gapless interval seals. The so-called gap seal refers to the pressure transmission widely used in the current production of oil with a large viscosity coefficient. In the work, the gap between the valve core and the valve seat is used to slide axially to realize the liquid distribution and reversing of the fluid system, so this kind of valve is called a slide valve, which can be operated manually or by electromagnetic force. The so-...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the different fluid viscosity coefficients, the structure of the reversing valve is different and there are many types. Even if the flow rate and pressure are the same, they cannot be used universally and interchangeably.

[0006] 2. The seal inside the slide valve depends on the gap. The existence of the gap will cause internal leakage. The internal leakage will cause the oil temperature to rise, thereby aggravating the internal leakage. At the same time, the internal leakage is a waste of energy.

[0007] 3. For the valves that currently use the internal seal of the valve as the interval seal, this kind of valve is repeatedly opened and closed during work. Every time it is closed, a large impact force will be generated between the valve core and the valve seat. This impact force will make Cracks and pitting occur on the mating surface of the valve core and the valve seat, and it is also possible that tiny particles in the fluid are inserted between the valve core and the valve seat, resulting in internal leakage of the valve

In the 14 years of use, there has been no internal leakage, and no other maintenance has been performed except for replacing the sealing ring several times

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