Movable valve seat type spring loaded type relief valve

Abstract

The invention discloses a movable valve seat type spring loaded type relief valve. The movable valve seat type spring loaded type relief valve comprises a valve body provided with a cavity body. A water inlet and a water outlet communicated with the cavity body are formed in the valve body. A valve core and a valve seat are arranged inside the cavity body of the valve body. A spring is arranged inside a cavity of the interior of a front end cover. A spring ejection rod is installed at the top of the spring, and a spring base is arranged at the bottom of the spring. One end of the spring abuts against the spring ejection rod, and the other end of the spring abuts against the spring base. The valve seat comprises a two-stage step structure. The ascending end of the step structure is in clearance fit with the valve body and a sleeve. According to the movable valve seat type spring loaded type relief valve, a valve core king-rod structure is designed in the position of an injection inlet where fluid enters the valve core through the valve seat, so that the fluid power of the sprayed fluid is conducted to the valve core through a valve core king-rod, and the impact force and the corrosion to the valve seat by the fluid power are reduced; in addition, the step structure part of the valve seat makes contact with the two-stage conical surfaces of the valve core, so that a two-stage throttling valve port structure is formed between the valve seat and the valve core, and the effective partial pressure can be achieved.

Description

technical field [0001] The invention relates to the field of pressure control components, in particular to a movable seat type direct-acting overflow valve suitable for fluid transmission and control systems in this field. Background technique [0002] As a common pressure control component in fluid transmission and control systems, relief valves are used to ensure constant system pressure or limit the maximum working pressure of the system or actuators. The electromagnetic overflow valve (the traditional structure is a pilot-operated overflow valve and a two-position two-way electromagnetic reversing valve with a remote control port) can not only realize the function of the overflow valve, but also unload the pump. However, [0003] (1) For high-pressure or large-flow systems, the overflow valve and its components are large in size and weight, high in cost, and difficult to manufacture, and are not suitable for some transmission and control systems that have strict require...

AI Technical Summary

Problems solved by technology

[0003] (1) For high-pressure or large-flow systems, the overflow valve and its components are large in size and weight, high in cost, and difficult to manufacture, and are not suitable for some transmission and control systems that have strict requirements on volume and weight, such as deep-sea operating systems , robot drive system, etc.

[0004] (2) The traditional direct-acting relief valve moves the spool relative to the valve seat. Due to the large effective pressure area of ​​the spool, the spring stiffness is large, resulting in a small pressure regulation range and low steady-state control accuracy.

[0005] (3) The hydraulic power in the traditional direct-acting relief valve is related to the valve core cone angle, flow rate, pressure and other parameters, which cannot be fully compensated, and the static and dynamic performance of the valve is poor

[0006] (4) The traditional direct-acting relief valve cannot form an electromagnetic relief valve with a two-position two-way electromagnetic reversing valve to realize pump pressure unloading. To realize this function, a two-position two-way electromagnetic reversing valve and a pilot type must be used. The relief valve constitutes an electromagnetic relief valve

[0007] (5) For the transmission and control systems of some low-viscosity working media (such as water, including seawater, fresh water or high water base, etc.), due to the physical and chemical characteristics of the working medium, at the valve port, the flow rate is high, wire drawing erosion occurs, and the pressure will drop sharply , resulting in severe cavitation, resulting in cavitation wear

The traditional single-stage throttling direct-acting relief valve cannot overcome this problem

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