JPH0373705U

JPH0373705U -

Info

Publication number: JPH0373705U
Application number: JP13475489U
Authority: JP
Priority date: 1989-11-20
Filing date: 1989-11-20
Publication date: 1991-07-24
Anticipated expiration: 2004-11-20
Also published as: JP2514159Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る流量調整弁の一実施例を
示す断面図、第２図は第１図に示す流量調整弁の
バルブスプールが図において右側へ移動された時
の状態を示す断面図、第３図は本考案に係る流量
調整弁の別の実施例を示す断面図、第４図は従来
の流量調整弁を示す断面図である。１０……バルブ本体、１８……第１の可変絞り
（油穴）、２０……第２の可変絞り（油穴）、３
０……バルブスプール、３２……油穴、３４，３
６……通油路、４０……圧力補償手段、４２……
スプリング室、４４……流路室、４６……圧力補
償ピストン、４８……補助スプール、５０……油
通路、５２……油室、５４……調圧スプリング、
５６……スプリング、６０……通油路、Ｐ……圧
油供給用コア、ＣＡ，ＣＢ……シリンダ用コア、
ＴＡ，ＴＢ……戻り油用コア、ｌ……リフト量。 Fig. 1 is a sectional view showing an embodiment of the flow rate regulating valve according to the present invention, and Fig. 2 is a sectional view showing the state when the valve spool of the flow rate regulating valve shown in Fig. 1 is moved to the right side in the figure. 3 is a sectional view showing another embodiment of the flow rate regulating valve according to the present invention, and FIG. 4 is a sectional view showing a conventional flow rate regulating valve. 10... Valve body, 18... First variable throttle (oil hole), 20... Second variable throttle (oil hole), 3
0...Valve spool, 32...Oil hole, 34,3
6... Oil passage, 40... Pressure compensation means, 42...
Spring chamber, 44...Flow path chamber, 46...Pressure compensating piston, 48...Auxiliary spool, 50...Oil passage, 52...Oil chamber, 54...Pressure adjustment spring,
56... Spring, 60... Oil passage, P... Pressure oil supply core, CA, CB... Cylinder core,
TA, TB...core for return oil, l...lift amount.

Claims

[Claims for Utility Model Registration] (1) Consisting of a valve body and a hollow valve spool that is slidably provided within the valve body and moves according to the amount of operation from the outside, The valve spool is provided with a core for supplying pressure oil at the center in the axial direction of the valve spool, cores for returning oil at both ends, and cylinder cores communicating with the hydraulically driven actuator between the cores, respectively,
With respect to the wall of the valve spool, when the operation amount is zero and the valve spool is in a neutral state, the valve spool is connected between the pressure oil supply core and the cylinder core and between the cylinder core and the return oil core. In the flow rate regulating valve, the oil hole is formed by a first variable throttle and the oil hole is opened by a second variable throttle, the opening area of which changes according to the amount of movement of the valve spool when the valve spool moves. The flow rate adjustment is characterized in that a pressure compensation means is slidably provided to control the opening area of the second variable throttle and adjust the differential pressure before and after the first variable throttle to a preset differential pressure. valve. (2) The pressure compensating means consists of a pressure compensating piston whose both ends are disposed within the end spring chamber and the central flow passage chamber of the hollow part of the valve spool. The auxiliary spool and the first
and a pressure regulating spring that sets a differential pressure before and after the variable throttle, and the pressure compensating piston moves in accordance with the set pressure of the pressure regulating spring due to the pressure reducing action of the auxiliary spool, thereby increasing the opening of the second variable throttle. The pressure compensation piston is configured to control the area, and in an overload condition exceeding the pressure upstream of the first variable throttle, the high pressure is introduced into the spring chamber and moves the pressure compensating piston to the closed position of the second variable throttle. 2. The flow rate regulating valve according to claim 1.