CN103322249A - Direct-acting sequence valve - Google Patents

Abstract

The invention discloses a direct-acting sequence valve, which includes an upper end cover, a valve body, and a valve core. The upper end cover and the valve body are installed in cooperation. Covered at the bottom of the valve cylinder, the upper end cover is provided with a screw threaded with it, the screw supports the valve core matched with the inner cavity of the valve through a spring, an oil inlet hole is provided at the lower part of the valve body, and a The oil outlet hole communicates or disconnects the oil inlet hole and the oil outlet hole through the annular groove of the valve core, and also includes a through hole that communicates with the oil inlet hole and the inner cavity of the valve body. The oil drain holes communicated with the inner cavity of the cover, and the spring includes a first spring connected in series and a second spring whose diameter is much smaller than the first spring. The sequence valve can operate within a relatively wide range of system pressure regulation, so that no complicated structure is required and only two springs are used to enable the direct-acting sequence valve to regulate pressure within a wide pressure range, thereby adjusting the system pressure.

Description

Direct acting sequence valve

technical field

The invention relates to a direct-acting sequence valve.

Background technique

The direct-acting sequence valve relies on the pressure oil in the system to directly act on the valve core to balance the spring force to control the opening and closing of the valve core. In the structural diagram, working principle diagram and graphic symbols of the direct-acting sequence valve, the inlet pressure oil acts on the bottom end surface of the valve core through the through hole a at the bottom of the valve core, and the action area is A, and the pressure oil acts on the end surface The force is pA, and the pretightening force of the pressure regulating spring acting on the spool is Fs. When the inlet oil pressure pA is small, that is, when pA≤Fs, the valve core is at the lower end position under the action of the spring, separating the P and T two oil ports, the valve port is closed, and no oil flows back to the oil tank at the oil return port T ( not sequence), that is, normally closed state. When the inlet oil pressure rises, the force generated at the lower end of the spool exceeds the pressing force Fs of the spring, that is, when pA>Fs, the spool moves up, the spring is compressed, the spool moves up, and the valve port is opened. The oil inlet hole is connected with the oil outlet hole, and the oil flows from the oil outlet hole to the system, and the sequence valve starts to operate. The spring force on the spool increases with the increase of the opening until it is balanced with the hydraulic force. The deficiencies of the prior art: a. The structure is relatively complicated; b. It is only applicable to sequences within a relatively narrow pressure range.

Contents of the invention

The object of the present invention is to provide a direct-acting sequence valve which has a simple structure and is suitable for operation in a relatively wide pressure range, aiming at the defects existing in the prior art.

In order to achieve the above object, the present invention adopts the following technical scheme: a direct-acting sequence valve, including an upper end cover, a valve body, and a valve core, and the upper end cover is installed in cooperation with the valve body, and the valve body is divided into two parts, one part is the lower end cover, the other part is a hollow valve cylinder, the lower end cover covers the bottom of the valve cylinder, the upper end cover is provided with a screw threaded with it, and the screw is supported by a spring to match the inner cavity of the valve The spool of the valve body is provided with an oil inlet hole at the lower part of the valve body, and an oil outlet hole is arranged at the upper part of the valve body, and the oil inlet hole and the oil outlet hole are communicated or disconnected through the annular groove of the valve core, and It includes a through hole communicating with the oil inlet hole and the inner cavity of the valve, an oil drain hole communicating with the inner cavity of the upper end cover is provided on the inner cavity side wall of the upper end cover, and the spring includes a first A spring and a second spring. the

Beneficial effect

The sequence valve can adjust the pressure of the system to be relatively large, so that no complicated structure is needed and only two springs are used to enable the direct-acting sequence valve to adjust the pressure within a wide pressure range, thereby adjusting the pressure of the system.

Description of drawings

Figure 1 is a schematic structural diagram of the direct-acting sequence valve of the present invention.

Among the figure 1, screw rod, 2, upper end cover, 3, thin spring, 4, thick spring, 5, spool, 6, valve body, 7, lower end cover. Detailed ways

As shown in Figure 1, the direct-acting sequence valve includes an upper end cover, a valve body, a screw, a valve core, an oil inlet hole and an oil outlet hole, and the upper end cover is installed with the valve body, and the valve body is divided into two parts , a part is the lower end cap, and the other part is a hollow valve cylinder, and the bottom of the valve body 6 is equipped with a lower end cap 7 . The upper end cover is provided with a screw threaded with it, and the screw 1 extends into the inner cavity of the upper end cover 2, and the screw supports the valve core matched with the inner cavity of the valve through a spring. The lower part is provided with an oil inlet, and the upper part of the valve body is provided with an oil outlet. A through hole communicating with the inner cavity of the upper end cover. An oil drain hole communicating with the inner cavity of the upper end cover is provided on the side wall of the upper end cover inner cavity. The spring includes a first spring and a second spring connected in series, and the first spring A thick spring is used, and a thin spring is used for the second spring.

The pressure oil enters the sequence valve from the oil inlet hole at the lower part of the valve body 6, and the pressure oil acts on the bottom of the valve core 5. When the acting area is A, the pressure oil of the oil is p, and the force acting on the end face is pA, the spring ( Or the thin spring 6 and the thick spring 7 together) the pretightening force acting on the conical spool 5 is Fs. When the inlet oil pressure pA is small, that is, pA≤Fs, the valve core 5 is at the lower end under the action of the spring (or the thin spring 3 and the thick spring 4 together), separating the oil inlet hole and the oil outlet hole, and the valve port Closed, no oil flow into the system, that is normally closed. When the inlet oil pressure rises, the force generated at the lower end of the valve core exceeds the pressing force Fs of the spring (or thin spring 3 and thick spring 4 together), that is, when pA>Fs, the valve core moves up and the spring is compressed , the spool 5 moves up, the valve port is opened, the oil inlet hole and the oil outlet hole are connected, the oil flows from the oil outlet hole to the system, and the sequence valve starts the sequence. Turn the screw rod 1 to move it up and down to change the preload of the spring so as to achieve the purpose of pressure regulation.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (1)

1. direct-acting type sequence valve, comprise upper end cap, valve body, spool, described upper end cap cooperates installation with valve body, described valve body is divided into two-part, a part is lower end cap, another part is the valve cylinder of hollow, described lower end cap is placed on described valve cylinder bottom, described upper end cap is provided with the screw rod that is threaded with it, described screw rod withstands the spool that matches with described body cavity by spring, be provided with oil inlet hole in described valve body lower portion, be provided with oil outlet on described valve body top, the circular groove by described spool makes oil inlet hole communicate with oil outlet or disconnects, and also comprises the through hole that communicates with described oil inlet hole and body cavity, the intracavity sidewall of described upper end cap is provided with the draining hole that communicates with described upper end cap inner chamber, it is characterized in that: described spring comprises first spring and second spring that is in series.