JPS6151192B2 - - Google Patents
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- Publication number
- JPS6151192B2 JPS6151192B2 JP54058126A JP5812679A JPS6151192B2 JP S6151192 B2 JPS6151192 B2 JP S6151192B2 JP 54058126 A JP54058126 A JP 54058126A JP 5812679 A JP5812679 A JP 5812679A JP S6151192 B2 JPS6151192 B2 JP S6151192B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- piston
- pressure
- oil passage
- piston chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Check Valves (AREA)
- Safety Valves (AREA)
- Details Of Valves (AREA)
Description
【発明の詳細な説明】
この発明は二つの油路の一方から他方へ、また
他方から一方へ油を流すことを可能にしたパイロ
ツト操作逆止弁に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pilot operated check valve which allows oil to flow from one of two oil passages to the other and from the other to one.
二つの油路を持ち、一方の油路から他方の油路
へ油を流すパイロツト作動逆止弁の一例を第１図
に示す。 An example of a pilot-operated check valve having two oil passages and allowing oil to flow from one oil passage to the other oil passage is shown in FIG.
弁体１にはピストン室２、ピストン室２の中間
部に連通させた油室３、ピストン室２の左端に連
通させた第１の油路Ａ、油室３に連通させた第２
の油路Ｂ、ピストン室２の右端に連通させた導油
路（パイロツト油路）４が設けられている。また
ピストン室２には戻しばね受け穴５および絞り６
をそなえたピストン７が摺動できるようにおさめ
られている。ピストン７はピストン室２および戻
しばね受け穴５におさめられた戻しばね８により
油室３側に押し付けられ、第１の油路Ａと第２の
油路Ｂとを遮断している。導油路４は配管９を経
て切換弁１０に連絡されており、同切換弁１０は
油槽１１に連絡されている。 The valve body 1 includes a piston chamber 2, an oil chamber 3 communicating with the intermediate portion of the piston chamber 2, a first oil passage A communicating with the left end of the piston chamber 2, and a second oil passage A communicating with the oil chamber 3.
An oil guide path (pilot oil path) 4 that communicates with the right end of the piston chamber 2 is provided. Also, the piston chamber 2 has a return spring receiving hole 5 and a throttle 6.
A piston 7 having a piston 7 is slidably housed therein. The piston 7 is pressed toward the oil chamber 3 by a return spring 8 housed in the piston chamber 2 and the return spring receiving hole 5, thereby blocking the first oil passage A and the second oil passage B. The oil guide path 4 is connected to a switching valve 10 via a pipe 9, and the switching valve 10 is connected to an oil tank 11.
切換弁１０が図のように遮断されている状態で
は、戻しばね８がおさめられているピストン室２
の油圧は第１の油路Ａのそれと等しく、したがつ
てピストン７は戻しばね８によつて押され、油室
３と油路Ａとの連絡口を閉鎖している。すなわち
油路ＡとＢとはたがいに遮断されている。 When the switching valve 10 is closed as shown in the figure, the piston chamber 2 in which the return spring 8 is housed
The oil pressure of the first oil passage A is equal to that of the first oil passage A, so the piston 7 is pushed by the return spring 8, closing the communication port between the oil chamber 3 and the oil passage A. That is, oil passages A and B are blocked from each other.
今、第１の油路Ａが高圧側で第２の油路Ｂが低
圧側とすると、切換弁１０を図について左側へ動
かし、配管９を油槽１１に連通させると、ピスト
ン室２内の油が排出され、同室内の圧力が下がり
油路Ａの圧力によつてピストン７が右側に押し動
かされ、第１の油路Ａと第２の油路Ｂとが連通す
る。これにより圧油は油路ＡからＢへ流れる。 Now, assuming that the first oil passage A is on the high pressure side and the second oil passage B is on the low pressure side, when the switching valve 10 is moved to the left in the figure and the piping 9 is communicated with the oil tank 11, the oil in the piston chamber 2 is is discharged, the pressure in the same chamber decreases, the piston 7 is pushed to the right by the pressure in the oil passage A, and the first oil passage A and the second oil passage B communicate with each other. As a result, pressure oil flows from oil path A to oil path B.
しかしながら、第１図の構造を有するパイロツ
ト操作逆止弁は、第２の油路Ｂが高圧側で第１の
油路Ａが低圧側となるとき、導油路４をタンク１
１に連通しても、油路Ａは低圧速であるから戻し
ばね８の力に抗してピストン７を右側に押し動か
すことができないので、第２の油路Ｂから第１の
油路Ａに油を流すことができない。また仮に、ば
ね８の力を低圧によつて動くような値にセツトす
ると、油路ＡとＢを遮断しているときのピストン
７の押付力が不足し、油路Ａの瞬間的圧変動や衝
撃などによつて油路ＡとＢが簡単に連通してしま
うので、戻しばねのばね力は一定以上のセツト圧
にすることが必要である。 However, in the pilot-operated check valve having the structure shown in FIG. 1, when the second oil passage B is on the high pressure side and the first oil passage A is on the low pressure side,
1, the piston 7 cannot be pushed to the right against the force of the return spring 8 because the oil passage A has a low pressure and speed, so the second oil passage B is connected to the first oil passage A. oil cannot be poured into it. Furthermore, if the force of the spring 8 is set to a value that allows it to move due to low pressure, the pressing force of the piston 7 when blocking oil passages A and B will be insufficient, causing instantaneous pressure fluctuations in oil passage A. Since oil passages A and B can easily be brought into communication due to impact or the like, it is necessary to set the spring force of the return spring to a set pressure above a certain level.
上記のように、第１図のパイロツト操作逆止弁
は第１の油路Ａが高圧側で、第２の油路Ｂが低圧
側のとき、油路ＡからＢに油を流すとともに油路
ＢからＡへの油の流れを防止する逆止弁の役割の
みをはたすものである。 As mentioned above, when the first oil passage A is on the high pressure side and the second oil passage B is on the low pressure side, the pilot operated check valve shown in Fig. 1 allows oil to flow from oil passage A to B, and It only serves as a check valve to prevent oil from flowing from B to A.
したがつて、二つの油路の一方から他方への油
の流れのみしか制御できず、他方から一方への流
れを制御するためには、他方から一方への油の流
れを制御するもう一つのパイロツト操作逆止弁を
必要とする。ゆえに、汎用性に欠け、また両方向
の油路切換を行うためにはコスト高となる欠点が
あつた。 Therefore, only the flow of oil from one of the two oil passages to the other can be controlled, and in order to control the flow from the other to the other, another Requires pilot operated check valve. Therefore, it lacks versatility and has the drawback of high cost for switching oil passages in both directions.
この発明は上記従来の問題点を解決すべくなさ
れたもので、パイロツト操作逆止弁の弁体内に二
つのピストン室を形成し、段付きピストンを前記
二つのピストン室に摺動できるようにおさめ、段
付きピストンに二つの油路の圧力を受ける受圧部
とこれに対抗して前記二つのピストン室の各圧油
を受ける二つの受圧部を設け、二つの油路の圧力
を受ける受圧部の面積をＳA，ＳBとし、これに対
抗する二つの受圧部の面積をSa，Sbとしたとき
Sa≧ＳA、Sb≧ＳBを満足するように前記受圧部
を形成し、かつ一方の油路と一方のピストン室を
絞りを介して接続し、他方の油路と他方のピスト
ン室を絞りを介して接続し、この二つのピストン
室の一方または他方の圧力を導油路を介して解放
しまたは両ピストン室を導油路を介して開放する
ことによつて二つの油路の一方から他方へ、また
は他方から一方へ圧油を流れるようにしたもの
で、パイロツト操作逆止弁の両方向の油路切換を
可能にし、かつ、両方向の油路切換を行うパイロ
ツト操作逆止弁のコストを低減させることを目的
とするものである。 This invention was made to solve the above-mentioned conventional problems, and includes forming two piston chambers within the valve body of a pilot-operated check valve, and fitting a stepped piston so that it can slide into the two piston chambers. , a stepped piston is provided with a pressure receiving part that receives the pressure of two oil passages, and two pressure receiving parts that receive pressure oil in the two piston chambers opposing the pressure receiving part, and a pressure receiving part that receives the pressure of the two oil passages. When the areas are S A and S B , and the areas of the two opposing pressure receiving parts are Sa and Sb.
The pressure receiving part is formed so as to satisfy Sa≧S A and Sb≧S B , and one oil passage and one piston chamber are connected via a throttle, and the other oil passage and the other piston chamber are throttled. The pressure in one or the other of these two piston chambers is released through the oil guide passage, or both piston chambers are opened through the oil guide passage, thereby releasing the pressure from one of the two oil passages. This allows pressure oil to flow to the other side or from the other side to the other side, allowing the pilot operated check valve to switch the oil passage in both directions, and reducing the cost of the pilot operated check valve that switches the oil passage in both directions. The purpose is to reduce the
以下この発明の一実施態様を第２図について説
明する。図において第１図と同符号のものは同一
部分または相当する部分を示す。 An embodiment of the present invention will be described below with reference to FIG. In the drawings, the same reference numerals as in FIG. 1 indicate the same or corresponding parts.
弁体１内には大径部１２ａおよび小径部１２ｂ
を有する段付きピストン１２がピストン室２ａお
よびピストン室２ｂに摺動できるようにおさめら
れており、ピストン１２は左端部において第１の
油路Ａおよび第２の油路Ｂに対する受圧面積ＳA
およびＳBを有し、かつ、ピストン１２の大径部
１２ａの右端において受圧面積Sa、小径部の右
端において受圧面積Sbを有している。上記ピス
トン１２の各受圧面積はSa≧ＳA、Sb≧ＳBを満
足するように構成する。第２図の実施例はSa＞
ＳA、Sb＞ＳBとした場合を示す。ピストン１２
の小径部が摺動するピストン室２ｂには小径部１
２ｂとピストン室２ｂとの間に戻しばね７が設け
られ、ピストン１２の左端を弁体１のシート面に
押し付け第１の油路Ａと第２の油路Ｂとを遮断し
ている。ピストン室２ａは弁体１に設けた導油路
１３、管路１４を介して切換弁１８ａに連絡され
ており、切換弁１８ａは油槽１１に連絡されてい
る。またピストン室２ａは前記導油路１３、弁体
１に設けた導油路１５を介して第２の油路Ｂに連
通している。ピストン室２ｂは本体１に設けた導
通路１６、管路１７を介して切換弁１８ｂに連絡
されており、同切換弁１８ｂは油槽１１に連絡さ
れている。 Inside the valve body 1, there are a large diameter part 12a and a small diameter part 12b.
A stepped piston 12 having a stepped piston 12 is slidably housed in the piston chamber 2a and the piston chamber 2b, and the piston 12 has a pressure receiving area S A for the first oil passage A and the second oil passage B at the left end.
and S B , and has a pressure receiving area Sa at the right end of the large diameter portion 12a of the piston 12 and a pressure receiving area Sb at the right end of the small diameter portion. Each pressure receiving area of the piston 12 is configured to satisfy Sa≧S A and Sb≧ SB . The embodiment shown in Fig. 2 is Sa>
The case where S A , Sb>S B is shown. piston 12
The small diameter part 1 is in the piston chamber 2b on which the small diameter part slides.
A return spring 7 is provided between the piston chamber 2b and the piston chamber 2b, and presses the left end of the piston 12 against the seat surface of the valve body 1 to block the first oil passage A and the second oil passage B. The piston chamber 2a is connected to a switching valve 18a via an oil guide path 13 and a pipe 14 provided in the valve body 1, and the switching valve 18a is connected to an oil tank 11. The piston chamber 2a also communicates with the second oil passage B via the oil passage 13 and the oil passage 15 provided in the valve body 1. The piston chamber 2b is connected to a switching valve 18b via a conduit 16 and a conduit 17 provided in the main body 1, and the switching valve 18b is connected to the oil tank 11.
第２図の実施態様は以上のような構成であるか
ら、いま、油路ＡおよびＢの圧力をそれぞれ
R1，P2とし、Ｆを戻しばね７のばね力とする
と、切換弁１８ａおよび１８ｂがピストン室２ａ
および２ｂと油槽との連通を断つている状態で
は、ピストン１２は左方向に、
ｆ＝P1（Sa−ＳA）＋P2（Sb−ＳB）＋Ｆ
………(1)
の力で弁体１の油路Ａのシート面に押し付けられ
ており、第１の油路Ａと第２の油路Ｂは遮断され
ている。 Since the embodiment shown in FIG. 2 has the above configuration, the pressures in oil passages A and B are
If R 1 , P 2 and F is the spring force of the return spring 7, the switching valves 18a and 18b are connected to the piston chamber 2a.
In the state where the communication between 2b and the oil tank is cut off, the piston 12 moves to the left as follows: f=P 1 (Sa-S A )+P 2 (Sb-S B )+F
......(1) The valve body 1 is pressed against the seat surface of the oil passage A, and the first oil passage A and the second oil passage B are cut off.
次に、第１の油路Ａから第２の油路Ｂに油を流
す場合について説明する。この場合には必ずP1＞
P2が成立している。切換弁１８ｂを操作してピス
トン室２ｂの油を油槽１１に連通すると、ピスト
ン室２ｂの油が油槽１１に排出されピストン室２
ｂの圧力はタンク圧（ここでは仮に圧力を０とす
る）となり、上記(1)式より、
f1＝P2（Sb−ＳB）−P1SA＋Ｆ ………(2)
が成立する。ここでf1はピストン１２の左方向へ
の押し付け力であるから、f1＜０のとき、すなわ
ち、(2)式より、
P1＞Ｐ２（Ｓｂ−ＳＢ）＋Ｆ／ＳＡ ………(3)
のとき、ピストン１２が右方向に動かされ、弁体
１のシート面よりはなれて、第２図に実線の矢印
で示すように、第１の油路Ａより第２の油路Ｂに
油が流れることになる。 Next, the case where oil flows from the first oil path A to the second oil path B will be described. In this case, P 1 >
P 2 is established. When the switching valve 18b is operated to communicate the oil in the piston chamber 2b to the oil tank 11, the oil in the piston chamber 2b is discharged to the oil tank 11, and the oil in the piston chamber 2b is discharged to the oil tank 11.
The pressure of b is the tank pressure (here, the pressure is assumed to be 0), and from the above equation (1), f 1 = P 2 (Sb - S B ) - P 1 S A + F ...... (2) is established. do. Here, f 1 is the pushing force of the piston 12 in the left direction, so when f 1 <0, that is, from equation (2), P 1 > P 2 (Sb-S B )+F/ SA ... ...(3), the piston 12 is moved to the right, moves away from the seat surface of the valve body 1, and moves from the first oil passage A to the second oil passage as shown by the solid arrow in FIG. Oil will flow to B.
さらに、第２の油路Ｂから第１の油路Ａに油を
流す場合について説明する。この場合には必ずP2
＞P1が成立している。切換弁１８ａを操作してピ
ストン室２ａの油を油槽１１に連通すると、ピス
トン室２ａの油が油槽１１に排出されピストン室
２ａはタンク圧となり（ここでは仮に圧力０とす
る）上記(1)式より、
f2＝P1（Sa−ＳA−P2B＋Ｆ ………(4)
が成立する。そこで、上記と同様に、f2＜０、す
なわち(4)式より、
P2＞Ｐ１（Ｓａ−ＳＡ）＋Ｆ／ＳＢ ………(5)
のとき、ピストン１２が右方に動かされ、弁体１
のシート面より離れて、第２図に点線の矢印で示
すように、第２の油路Ｂより第１の油路Ａに油が
流れることになる。 Furthermore, the case where oil flows from the second oil path B to the first oil path A will be described. In this case, always P 2
>P 1 holds true. When the switching valve 18a is operated to communicate the oil in the piston chamber 2a to the oil tank 11, the oil in the piston chamber 2a is discharged to the oil tank 11, and the pressure in the piston chamber 2a becomes tank pressure (here, the pressure is temporarily set to 0). From the formula, f 2 = P 1 (Sa−S A −P 2 B + F ………(4) holds true. Therefore, similarly to the above, f 2 < 0, that is, from formula (4), P 2 > P 1 (Sa-S A )+F/S B (5), the piston 12 is moved to the right, and the valve body 1
The oil flows from the second oil passage B to the first oil passage A, as shown by the dotted line arrow in FIG. 2, away from the seat surface.
また、油路Ａの圧力P1と油路Ｂの圧力P2が両方
とも低圧で受圧面積Sa，ＳA，Sb，ＳBおよびば
ね力Ｆの選定条件によつて、上記(3)、(5)式が成立
しない場合には、ピストン１２が右方に移動しな
いことになる。この場合油路Ａから油路Ｂへ油を
流す場合に、切換弁１８ｂと切換弁１８ａを両方
操作すると(3)式は、
P1＞Ｆ１−Ｐ２・ＳＢ／ＳＡ ………(6)
となり、また逆に切替油路Ｂから切替油路Ａに油
を流す場合に、両切換弁１８ａおよび１８ｂを操
作すると、(5)式は、
P2＞Ｆ１−Ｐ１・ＳＡ／ＳＢ ………(7)
で、上記(6)・(7)式を満足するP1またはP2でピスト
ン１２を右方に移動させ、油路ＡからＢまたは油
路ＢからＡへ油を流すとが可能である。 In addition, when the pressure P 1 of the oil passage A and the pressure P 2 of the oil passage B are both low pressures and the selection conditions of the pressure receiving areas Sa, S A , Sb, S B and the spring force F, the above (3), ( If the formula 5) does not hold, the piston 12 will not move to the right. In this case, when oil flows from oil path A to oil path B, if both switching valves 18b and 18a are operated, equation (3) becomes P 1 >F 1 -P 2・S B /S A ...... (6), and conversely, when oil flows from switching oil path B to switching oil path A, when both switching valves 18a and 18b are operated, equation (5) becomes P 2 > F 1 − P 1・S A /S B ...... (7) Then move the piston 12 to the right with P 1 or P 2 that satisfies the above equations (6) and (7), and move the piston 12 from oil path A to B or from oil path B to A. It is possible to pour oil into the
第２図の実施態様において切換弁１８ａ，１８
ｂはパイロツト操作逆止弁の弁体１と管路を介し
て接続した場合を示したが、切換弁１８ａ，１８
ｂを弁体１内に組み込んで一体構造とすることも
可能である。 In the embodiment of FIG. 2, the switching valves 18a, 18
b shows the case where it is connected to the valve body 1 of the pilot operated check valve via a pipe, but the switching valves 18a, 18
It is also possible to incorporate b into the valve body 1 to form an integral structure.
次に、この発明の他の実施態様を第３図につい
て説明する。 Next, another embodiment of the invention will be described with reference to FIG.
図において、第１図、第２図と同符号のものは
同一部分または相当する部分を示す。 In the figures, the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts.
弁体１内にはシリンダ部１９を設け、シリンダ
部１９にはスプール２０が摺動できるようにおさ
められている。スプール２０の一端とシリンダ部
１９との間には戻しばね２１が挿入され、またス
プールの他端には鉄片２２が当接されており、鉄
片２２の周囲にはソレノイド２３が配設されてい
る。また、シリンダ部１９は導油路２４により油
槽１１に連絡されている。ピストン室２ａは導油
路１３を介して、前記シリンダ部１９に連絡され
ピストン室２ｂは導油路１６を介して前記シリン
ダ部１９に連絡されている。また通常は導油路１
３と導油路１６とはスプール２０によつて導油路
２４とは遮断されているが、ソレノイド２３を励
磁すると、鉄片２２がスプール２０をばね２１に
抗して図の上方に移動させ、導油路１３と導油路
１６とを導油路２４に連通させるようになつてい
る。段付きピストン室１２の各受圧面積は第２図
と同様にSa，ＳA，Sb，ＳBを有するものとし、
Sa≧ＳA、Sb≧ＳBを満足するように構成する。
第３図の実施例はSa＝ＳA、Sb＝ＳBとした場合
を示す。 A cylinder portion 19 is provided within the valve body 1, and a spool 20 is slidably housed in the cylinder portion 19. A return spring 21 is inserted between one end of the spool 20 and the cylinder portion 19, and an iron piece 22 is in contact with the other end of the spool, and a solenoid 23 is arranged around the iron piece 22. . Further, the cylinder portion 19 is connected to the oil tank 11 by an oil guide path 24. The piston chamber 2a is communicated with the cylinder section 19 via an oil guide path 13, and the piston chamber 2b is communicated with the cylinder section 19 via an oil guide path 16. Also, usually oil guide path 1
3 and the oil guide path 16 are cut off from the oil guide path 24 by the spool 20, but when the solenoid 23 is energized, the iron piece 22 moves the spool 20 upward in the figure against the spring 21. The oil guide path 13 and the oil guide path 16 are made to communicate with the oil guide path 24. Each pressure receiving area of the stepped piston chamber 12 is assumed to have Sa, S A , Sb, and S B as in FIG.
It is configured to satisfy Sa≧S A and Sb≧S B.
The embodiment shown in FIG. 3 shows the case where Sa= SA and Sb= SB .
いま、油路Ａの圧力をP1、油路Ｂの圧力をP2と
し、戻しばね７のばね力をＦとする。図の状態で
スプール１２の左端部は弁体１のシート面に押し
付けられて油路Ａと油路Ｂとを遮断している。ス
プール１２の左方への押し付け力ｆは第２図の場
合と同様で前記(1)式で示される。 Now, assume that the pressure in oil passage A is P 1 , the pressure in oil passage B is P 2 , and the spring force of return spring 7 is F. In the state shown in the figure, the left end of the spool 12 is pressed against the seat surface of the valve body 1 to block oil passage A and oil passage B. The leftward pressing force f of the spool 12 is the same as in the case of FIG. 2, and is expressed by the above equation (1).
いま、油路Ｂが高圧側で油路Ａが低圧側であり
すなわちP2＞P1の場合について説明する。 Now, a case will be described in which oil passage B is on the high pressure side and oil passage A is on the low pressure side, that is, P 2 > P 1 .
ソレノイド２３を励磁して、導油路１３を導油
路１６を油槽１１に連通するとピストン室２ａと
ピストン室２ｂの圧力は開放される。このとき(1)
式より、
f1＝Ｆ−P1SA−P2SB ………(8)
となり、f1＜０のとき、ピストン１２が右側に動
かされ、弁体１のシート面よりはなれて、第３図
の実線の矢印で示すように油路Ｂより油路Ａに油
が流れる。 When the solenoid 23 is excited and the oil guide path 13 and oil guide path 16 are communicated with the oil tank 11, the pressure in the piston chamber 2a and the piston chamber 2b is released. At this time (1)
From the formula, f 1 =F−P 1 S A −P 2 S B (8), and when f 1 <0, the piston 12 is moved to the right and separated from the seat surface of the valve body 1, Oil flows from oil path B to oil path A as shown by the solid arrow in FIG.
油路Ａの圧力P1が油路Ｂの圧力P2より高い場合
にも同様である。 The same applies when the pressure P 1 in the oil passage A is higher than the pressure P 2 in the oil passage B.
また、第２図および第３図の実施例においてピ
ストン１２の受圧面積がＳA＝ＳB、ＳB＝Sbのと
きにはピストン１２を弁体１のシート面に押し付
けるための戻しばね７が必要であるが、Sa＞ＳA
でかつ、Sb＞ＳBのときには戻しばね７を設けな
くても良い。また戻しばね７を設ける場合には、
ピストン室２ａとピストン室２ｂの一方または双
方に設けても良いことは言うまでもない。 Further, in the embodiments shown in FIGS. 2 and 3, when the pressure receiving area of the piston 12 is S A =S B and S B =Sb, the return spring 7 is required to press the piston 12 against the seat surface of the valve body 1. Yes, but Sa＞S A
Moreover, when Sb>S B , it is not necessary to provide the return spring 7. In addition, when providing the return spring 7,
It goes without saying that it may be provided in one or both of the piston chamber 2a and the piston chamber 2b.
以上述べたように、この発明によれば、パイロ
ツト操作逆止弁の両方向油路切換を換単な構造で
可能にするとともに両方向油路の切換を行うパイ
ロツト操作逆止弁のコストを著しく低減させる効
果を奏するものである。 As described above, according to the present invention, it is possible to switch the oil passage in both directions of a pilot operated check valve with a simple structure, and the cost of the pilot operated check valve that switches the oil passage in both directions is significantly reduced. It is effective.
第１図は従来のパイロツト操作逆止弁の構造お
よび作動用油圧回路を示す図、第２図はこの発明
のパイロツト操作逆止弁とその作動油圧回路を示
す図、第３図はこの発明の他の実施例を示す図で
ある。
Fig. 1 is a diagram showing the structure and operating hydraulic circuit of a conventional pilot operated check valve, Fig. 2 is a diagram showing the pilot operated check valve of the present invention and its operating hydraulic circuit, and Fig. 3 is a diagram showing the operating hydraulic circuit of the pilot operated check valve of the present invention. It is a figure which shows another Example.
Claims (1)
体、ピストン室と一方の油路に通じる絞りを有
し、ピストン室に摺動できるようおさめられたピ
ストンを備え、ピストンを弁体に押圧して二つの
油路を遮断し、ピストン室の圧油を降下させるこ
とによつて一方の油路から他方の油路へ圧油を流
すようにしたパイロツト操作逆止弁において、弁
体内に二つのピストン室を形成し、段付きピスト
ンを前記二つのピストン室に摺動できるようにお
さめ、該段付きピストンに前記二つの油路の圧力
を受ける受圧部とこれに対抗して前記二つのピス
トン室の各圧油を受ける二つの受圧部を設け、二
つの油路の圧力を受ける受圧部の面積をＳA，ＳB
とし、これに対抗する二つの受圧部の面積を
Sa，Sbとしたとき、Sa≧ＳA、Sb≧ＳBを満足す
るように前記各受圧部を形成し、かつ一方の油路
と一方のピストン室を絞りを介して接続し、他方
の油路と他方のピストン室を絞りを介して接続
し、二つのピストン室の一方または他方の圧力を
導油路を介して解放し、または両ピストン室を導
油路を介して解放することによつて二つの油路の
一方から他方へまたは他方から一方へ圧油を流れ
るように構成したことを特徴とするパイロツト操
作逆止弁。1. A valve body forming two oil passages and a piston chamber, a throttle communicating with the piston chamber and one of the oil passages, and a piston housed in a slidable manner in the piston chamber, the piston being pressed against the valve body. A pilot-operated check valve that allows pressure oil to flow from one oil passage to the other by blocking two oil passages and lowering the pressure oil in the piston chamber, has two pistons inside the valve body. A stepped piston is slidably accommodated in the two piston chambers, and the stepped piston has a pressure receiving part that receives the pressure of the two oil passages and a pressure receiving part of the two piston chambers that opposes the pressure receiving part. Two pressure receiving parts are provided to receive each pressure oil, and the areas of the pressure receiving parts that receive the pressure of the two oil passages are S A and S B
The area of the two opposing pressure receiving parts is
When Sa and Sb, each pressure receiving part is formed so as to satisfy Sa≧S A and Sb≧S B , and one oil passage and one piston chamber are connected via a throttle, and the other oil passage is connected to one piston chamber via a throttle. The pressure in one or the other of the two piston chambers is released through the oil guide path, or both piston chambers are released through the oil guide path. A pilot-operated check valve characterized in that it is configured to allow pressure oil to flow from one of two oil passages to the other or from the other to one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5812679A JPS55152981A (en) | 1979-05-14 | 1979-05-14 | Pilot-operated check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5812679A JPS55152981A (en) | 1979-05-14 | 1979-05-14 | Pilot-operated check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55152981A JPS55152981A (en) | 1980-11-28 |
| JPS6151192B2 true JPS6151192B2 (en) | 1986-11-07 |
Family
ID=13075279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5812679A Granted JPS55152981A (en) | 1979-05-14 | 1979-05-14 | Pilot-operated check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55152981A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS641693U (en) * | 1987-06-23 | 1989-01-06 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10428913B2 (en) | 2014-01-28 | 2019-10-01 | Borgwarner Inc. | Orifice flow valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS444554Y1 (en) * | 1964-11-09 | 1969-02-19 |
-
1979
- 1979-05-14 JP JP5812679A patent/JPS55152981A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS641693U (en) * | 1987-06-23 | 1989-01-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55152981A (en) | 1980-11-28 |
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