JPS6369863U

JPS6369863U -

Info

Publication number: JPS6369863U
Application number: JP16591686U
Authority: JP
Priority date: 1986-10-28
Filing date: 1986-10-28
Publication date: 1988-05-11
Also published as: JPH0442607Y2

Description

[Brief explanation of the drawing]

第１図から第３図は本考案の実施例を示し、第
１図は方向切換弁の縦断面図、第２図は方向切換
弁のリターン操作状態を示す説明図で、第２図ａ
は圧抜弁体１２の開弁開始状態、第２図ｂはリタ
ーン弁体９の開弁開始状態、第２図ｃは圧力供給
弁体８の押閉じ状態を示す模式図で、第３図はリ
ターン操作手段の操作ストロークの時間変化を示
す図、第４図は従来例の方向切換弁の縦断面図で
ある。１……弁箱、３……弁室、８……圧力供給弁体
、９……リターン弁体、１０……圧抜孔、１１…
…圧抜弁室、１２……圧抜弁体、１４……閉弁ば
ね、１６……リターン操作手段、２３……出力部
、２４……圧抜開弁具、２５……リターン開弁具
、２８……圧力供給弁体案内筒、Ａ……作業ポー
ト、Ｐ……圧力ポート、Ｒ……リターンポート、
ｅ……圧力供給用開弁ストローク。 1 to 3 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the directional control valve, FIG. 2 is an explanatory view showing the return operation state of the directional control valve, and FIG.
2B is a schematic diagram showing the pressure relief valve body 12 in the opening state, FIG. 2B is the return valve body 9 in the opening state, FIG. 2C is the pressure supply valve body 8 in the pressed and closed state, and FIG. FIG. 4, which is a diagram showing changes over time in the operating stroke of the return operating means, is a longitudinal sectional view of a conventional directional control valve. DESCRIPTION OF SYMBOLS 1...Valve box, 3...Valve chamber, 8...Pressure supply valve body, 9...Return valve body, 10...Pressure relief hole, 11...
...Pressure relief valve chamber, 12...Pressure relief valve body, 14...Valve closing spring, 16...Return operation means, 23...Output section, 24...Pressure relief valve opening tool, 25...Return valve opening tool, 28 ...Pressure supply valve body guide tube, A...Work port, P...Pressure port, R...Return port,
e...Valve opening stroke for pressure supply.

Claims

[Scope of utility model registration request]

A pressure port P is provided on one end wall of the valve chamber 3 formed linearly in the valve box 1, and a return port R is provided on the other end wall.
A working port A is opened in the peripheral wall, a pressure supply valve body 8 and a return valve body 9 are inserted into the pressure port P and a return port R in the valve chamber 3 so that they can be opened and closed, respectively, and a pressure relief hole is formed in the return valve body 9. A pressure relief valve chamber 10 and a pressure relief valve chamber 11 are respectively formed so as to face the return port R and the valve chamber 3, and the valve chamber 3 is communicated with the return port R via the pressure relief valve chamber 11 and the pressure relief hole 10, and the pressure relief valve chamber 11 is connected to the pressure relief valve chamber 11. Insert the pressure relief valve body 12, insert the valve closing spring 14 between the pressure relief valve body 12 and the pressure supply valve body 8, and move the pressure supply valve body 8, the pressure relief valve body 12, and the return valve body 9 to the valve closing side. A return operating means 16 is provided on the outside of the return port R, and a pressure relief valve opening tool 24 and a return valve opening tool 25 are connected to the output part 23 of the return operation means 16 from the return port R side to the pressure relief valve body 12 and the return. The pressure relief valve bodies 12 are opened by the return operation means 16 to open the pressure relief valve bodies 12 to relieve pressure into the valve chamber 3, and then the return valve opening mechanism 25 opens the pressure relief valve bodies 12 and releases the pressure into the valve chamber 3. Seat valve type two-position, three-connection, two-way type hydraulic system configured to open the return valve body 9 and begin draining oil from the work port A to the return port R, while pushing the pressure supply valve body 8 toward the valve closing side. In the directional control valve, the pressure supply valve body guide cylinder 28 is extended from the peripheral wall of the pressure relief valve chamber 11 in the return valve body 9 toward the pressure port P side, and the pressure supply valve body 8 is connected to the pressure supply valve body guide cylinder 28. is inserted, the pressure supply valve body 8 is opposed to the pressure relief valve body 12 with a pressure supply valve opening stroke e left, and when the return operation means 16 is operated to return, the pressure relief valve body 12 closes the pressure supply valve body 8. A two-position, three-connection two-position, three-connection two-way directional control valve for a hydraulic system, characterized in that it is configured to be pushed toward the side and closed.