JPS61164866U

JPS61164866U -

Info

Publication number: JPS61164866U
Application number: JP4919785U
Authority: JP
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1986-10-13

Description

[Brief explanation of the drawing]

第１図ａはこの考案の実施例のアンチキヤビテ
ーシヨン用ポペツト弁の主要部拡大断面図、第１
図ｂは第１図ａと同じ部分の異なる状態の断面図
、第２図は従来の方向切換弁に設けられた圧力制
御の構造を示断面図、第３図ａは従来のアンチキ
ヤビテーシヨン用ポペツト弁の主要部拡大断面図
、第３図ｂは第３図ａと同じ部分の異なる状態の
断面図、第４図はアンチキヤビテーシヨン用のポ
ペツト弁の圧力差△Ｐに対する流量Ｑで示す特性
曲線のグラフであり曲線Ｂ１が従来のもの曲線Ｅ
がこの考案のものである。Ａ……方向切換弁本体、Ｂ……圧力制御弁、１
……高圧側、２……低圧側、１６……アンチキヤ
ビテーシヨン用ポペツト、Ａ１……弁座、Ｐ１…
…ポケツト。 Figure 1a is an enlarged sectional view of the main parts of the anti-cavitation poppet valve according to the embodiment of this invention.
Figure b is a sectional view of the same part as Figure 1 a in a different state, Figure 2 is a sectional view showing the pressure control structure provided in a conventional directional control valve, and Figure 3 a is a sectional view of a conventional anti-cavity valve. Fig. 3b is a sectional view of the same part as Fig. 3a in a different state; Fig. 4 is a flow rate relative to the pressure difference △P of the poppet valve for anti-cavitation. This is a graph of the characteristic curve indicated by Q, where curve B1 is the conventional curve E.
is the one of this idea. A... Directional switching valve body, B... Pressure control valve, 1
...High pressure side, 2...Low pressure side, 16...Anti-cavitation poppet, A1...Valve seat, P1...
...Pocket.

Claims

[Scope of utility model registration request]

A poppet is provided between the high-pressure side and the low-pressure side so that a pressing force due to the oil pressure difference between the two sides acts. When the oil pressure on the high-pressure side is lower than the oil pressure on the low-pressure side by a certain value, the poppet In a pressure control valve having an anti-cavitation poppet valve configured to be separated from the valve seat, pressure oil flow in a gap-like pressure oil passage formed when the poppet is slightly separated from the valve seat. A pressure control valve characterized in that a pocket portion is formed in either or both of the low pressure side portion of the poppet and the low pressure side portion of the valve seat so as to shorten the distance in the direction.