JPS62176565U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの考案の１実施例の縦断面図、第２
図は同実施例の時間Ｔに対する出力口圧力Ｐの上
昇特性を示すグラフ、第３図は従来の圧力制御弁
の１例を示す縦断面図、第４図は第３図の圧力制
御弁の時間Ｔに対する通路１２の圧力Ｐの上昇特
性を示すグラフである。 ２１……入力口、２２……排出口、２３……主
弁、２４……流量制御弁、２５……室、２６……
ばね、２７……第１ピストン、４８……第２ピス
トン、５３……通路。 Fig. 1 is a vertical sectional view of one embodiment of this invention, Fig. 2
The figure is a graph showing the rise characteristic of the output port pressure P with respect to time T in the same embodiment, Figure 3 is a vertical cross-sectional view showing an example of a conventional pressure control valve, and Figure 4 is a graph showing the rise characteristic of the output port pressure P with respect to time T in the same embodiment. 7 is a graph showing the increase characteristic of the pressure P in the passage 12 with respect to time T. 21... Input port, 22... Outlet port, 23... Main valve, 24... Flow rate control valve, 25... Chamber, 26...
Spring, 27...first piston, 48...second piston, 53...passage.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 入力口と排出口との間を開閉するように主弁を
設け、前記入力口の油圧に対し前記主弁の開弁す
る圧力を設定するばねを設けてなる圧力制御弁に
おいて、圧力補償弁付流量制御弁を介して前記入
力口に連通する室を設け、この室に流入する油に
より作動して前記ばねによる開弁圧を増大させる
ように前記ばねを前記主弁を介して押圧する第１
ピストンを設け、前記ばねを収容し内部が通路を
介して前記排出口に接続したばね室内に前記主弁
と共に移動する第２ピストンを設け、第１ピスト
ンの前記ばねを押圧する作動の終端部に対応した
第２ピストンの移動位置で第２ピストンにより前
記通路を絞る絞りを設けた圧力制御弁。 A pressure control valve comprising a main valve for opening and closing between an input port and a discharge port, and a spring for setting the pressure at which the main valve opens with respect to the hydraulic pressure at the input port, the pressure control valve having a pressure compensation valve. A first chamber that includes a chamber that communicates with the input port via a flow rate control valve, and is actuated by oil flowing into the chamber to press the spring via the main valve so as to increase the valve opening pressure exerted by the spring.
A piston is provided, and a second piston that moves together with the main valve is provided in a spring chamber that houses the spring and is connected to the discharge port through a passage, and at the end of the action of the first piston that presses the spring. A pressure control valve is provided with a restriction that throttles the passage by the second piston at a corresponding movement position of the second piston.