Electro-mechanical dual control pilot valve for unloading valve

Abstract

The invention discloses an electro-mechanical dual control pilot valve for an unloading valve. The problems of complicated structure, large manufacture difficulty and maintaining inconvenience in the prior art are overcome. The electro-mechanical dual control pilot valve for the unloading valve is characterized in that a valve body communication hole and a secondary valve body communication hole are interconnected to form a high-pressure fluid channel for supplying liquid by a solenoid pilot valve, or a valve body counter bore is added to form the high-pressure fluid channel for supplying liquid by the solenoid pilot valve together with a secondary valve body counter bore and a one-way valve assembly; the valve body communication hole and the secondary valve body communication hole are correspondingly communicated to form a liquid inlet channel and a liquid return channel; two secondary valve body main holes are processed on the secondary valve body; a cartridge valve core is inserted into a first main hole of the secondary valve body; a filter core or the filter core containing a rapid joint seat externally connected with an accumulator is arranged inside a second main hole of the secondary valve body; and the secondary valve is arranged on the back side of a mechanical pilot valve, and the solenoid pilot valve is arranged on the secondary valve. The electro-mechanical dual control pilot valve has the beneficial effects that high-pressure liquid does not need to be externally connected; the filter and the one-way valve do not need to be externally connected, and the electro-mechanical dual control pilot valve has the filter function and one-way valve function, is simple in structure, reduces the manufacture difficulty and brings about convenience for maintenance.

Description

technical field [0001] The invention belongs to the technical field of pumping station control equipment, in particular to an electromechanical double-control pilot valve used for an unloading valve of a coal mine emulsion pump. Background technique [0002] The pilot valve of the hydraulic control unloading valve of the emulsion pumping station in the prior art is composed of a valve body, a valve seat, a valve core, a booster piston, a strong spring, a pressure introduction throttle plug, a pump inlet fluid throttle plug and a control piston section. The pilot valve of this hydraulic control structure can only realize hydraulic control unloading, and the pressure fluctuation value is relatively large. Human control is required. In the prior art, there is also a mechanism that installs hydraulically controlled unloading and electronically controlled unloading on a set of devices at the same time, but it can only realize electronically controlled unloading or hydraulically ...

AI Technical Summary

Problems solved by technology

However, the technical problem in the above technical solution is that installing an electronically controlled bypass switch valve in the pilot valve body is difficult to manufacture and inconvenient to maintain, and it needs to be connected with the electromagnetic pilot valve through a transition connecting plate, and the overall structure is relatively complicated. ; while the electronically controlled bypass switch valve is installed outside the pilot valve body, since the electromagnetic pilot valve is located below the electronically controlled bypass switch valve, it not only occupies a large space, but it is also inconvenient to maintain the electromagnetic pilot valve from the bottom. In addition, in order to ensure the electronic control The high reliability of unloading and hydraulic control unloading requires an external one-way valve to store high-pressure fluid, so that before the pump is started next time, the solenoid valve of the pilot valve of the unloading valve can be controlled by high-pressure fluid to achieve no-load The purpose of starting

In order to ensure that the valve will not be polluted by the working fluid containing dirt, an external filter is also required. Since the check valve and filter are both external, the overall size of the equipment is relatively large, and some connectors are required, which increases the manufacturing cost.

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