CN108488110A - A kind of single-action reciprocating hydraulic intensifier - Google Patents

A kind of single-action reciprocating hydraulic intensifier Download PDF

Info

Publication number
CN108488110A
CN108488110A CN201810479825.4A CN201810479825A CN108488110A CN 108488110 A CN108488110 A CN 108488110A CN 201810479825 A CN201810479825 A CN 201810479825A CN 108488110 A CN108488110 A CN 108488110A
Authority
CN
China
Prior art keywords
valve
control
hydraulic
fluid port
hydraulic fluid
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.)
Pending
Application number
CN201810479825.4A
Other languages
Chinese (zh)
Inventor
邵玉刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Hate Paavo Hydraulic Technology Co Ltd
Original Assignee
Dongguan Hate Paavo Hydraulic Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongguan Hate Paavo Hydraulic Technology Co Ltd filed Critical Dongguan Hate Paavo Hydraulic Technology Co Ltd
Priority to CN201810479825.4A priority Critical patent/CN108488110A/en
Publication of CN108488110A publication Critical patent/CN108488110A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027Check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Abstract

The invention discloses a kind of single-action reciprocating hydraulic intensifiers comprising pressurizing pack, liquid controlled reversing valve module.Booster low-pressure piston is when moving to low pressure (LP) cylinder left and right ends extreme position, left piston chamber and the oil liquid pressure of right piston intracavitary can also increase, the overflow valve being connected with the same side pilot operated directional control valve control chamber is triggered to open, to promote the spool of liquid controlled reversing valve module to move, flow direction change, to which high pressure oil flows into the plunger shaft of the other side, piston reverses direction movement is pushed, repeatedly.The present invention can realize automatic continuous supercharging, be not only simple in structure, and be not necessarily to automatically controlled control.

Description

A kind of single-action reciprocating hydraulic intensifier
Technical field
The present invention relates to hydraulic intensifier technical field more particularly to it is a kind of can it is reliable, can automatically continuously be pressurized Single-action reciprocating hydraulic intensifier.
Background technology
Hydraulic intensifier is different using piston both ends active area and the identical principle of stress size, and hydraulic pressure is put Low pressure can be increased to 200MPa or more by a kind of big ultrahigh-pressure hydraulic element, hydraulic intensifier.The country is adopted at present Conventional hydraulic booster is the continuous commutation by solenoid directional control valve, and control booster moves back and forth continuous output high pressure, Complicated, the displacement sensor and automatically controlled component, volume and weight for needing setting complicated are huge, it has not been convenient to carry, easy It is difficult to use in terms of combustion hazardous applications and portable mechanism, such as natural gas compressing substation, garbage compression station, oil mine, coal Perfusion etc. has a requirement of explosion proof, objective requirement hydraulic booster pump can meet be not necessarily to personnel's short distance intervention can voluntarily commutate and Also meets the needs of explosion-proof.
Invention content
It is an object of the invention to overcome the defect in the prior art, one kind is provided and can be achieved with continuously without automatically controlled control The reciprocating-type supercharger of reliable automatic reciprocating supercharging.
To solve problems of the prior art, the specific technical solution of use is:
A kind of single-action reciprocating hydraulic intensifier comprising pressurizing pack, liquid controlled reversing valve module, the pressurizing pack Including low-pressure piston, high pressure piston, the high pressure piston is connected with the right end of low-pressure piston, and is formed on the right side of high pressure piston High pressure chest is respectively formed left piston chamber and right piston chamber in the left and right side of low-pressure piston, and the high pressure chest passes through fuel-displaced list It is connected to valve with high-pressure output port.
The liquid controlled reversing valve module includes reversing valve core, left overflow valve, left hydraulic control one-way valve, right overflow valve and right hydraulic control Check valve is equipped on the both ends of reversing valve core and intermediate excircle in the liquid controlled reversing valve module multiple spaced Protruding ring, the left and right ends of the reversing valve core are respectively formed left control chamber and right control chamber, on the liquid controlled reversing valve module Equipped with oil inlet, oil return opening, the first hydraulic fluid port, the second hydraulic fluid port.
The left piston chamber is connected to the first hydraulic fluid port, and the right piston chamber is connected with the second hydraulic fluid port.
The oil inlet of the left overflow valve is connected to the first hydraulic fluid port, the left control of oil return opening and liquid controlled reversing valve module The control port connection of chamber, the oil inlet of left hydraulic control one-way valve, right hydraulic control one-way valve;The oil inlet and second of the right overflow valve Hydraulic fluid port is connected to, oil return opening and the right control chamber of liquid controlled reversing valve module, the control port of left hydraulic control one-way valve, right fluid-control one-way The oil inlet of valve connects;Oil return of the oil return opening of the left hydraulic control one-way valve and right hydraulic control one-way valve all with liquid controlled reversing valve module Mouth communicates;In the state that left overflow valve is opened, right hydraulic control one-way valve is opened, and reversing valve core moves to right, and oil inlet and the second hydraulic fluid port connect Logical, the first hydraulic fluid port is connected with oil return opening;In the state that right overflow valve is opened, left hydraulic control one-way valve is opened, and reversing valve core moves to left, Oil inlet is connected to the first hydraulic fluid port, and the second hydraulic fluid port is connected to oil return opening.
Preferred scheme is limited using functional herein for the setting structure of protruding ring on more convenient description reversing valve core Surely the method described, on the reversing valve core setting of protruding ring meet:When reversing valve core moves to left, oil inlet and the first hydraulic fluid port Connection, the second hydraulic fluid port are connected to oil return opening;When reversing valve core moves to right, oil inlet is connected to the second hydraulic fluid port, the first hydraulic fluid port with return Hydraulic fluid port is connected to.It is set gradually there are four protruding ring by left-to-right on reversing valve core:The first from left protruding ring, the second from left protruding ring, the right side two are convex Ring, a right protruding ring are played, there are five hydraulic fluid ports for the lower part setting of reversing valve core:It is followed successively by the first oil return opening, the first oil by left-to-right Mouth, oil inlet, the second hydraulic fluid port, the second oil return opening, wherein the first oil return opening and the second oil return opening are connected to form oil return opening.When changing When being moved to left to spool, oil inlet and the first hydraulic fluid port are formed between the second from left protruding ring and right two protruding rings and are connected to, the second hydraulic fluid port with Second oil return opening forms connection between right two protruding rings and a right protruding ring;When reversing valve core moves to right, the first hydraulic fluid port and One oil return opening forms connection, oil inlet and the second hydraulic fluid port in the second from left protruding ring and the right side between the first from left protruding ring and the second from left protruding ring Connection is formed between two protruding rings.
Further preferred scheme, the high pressure chest are connected to by line check valve with oil inlet.
Scheme still further preferably, the liquid controlled reversing valve module include valve body, set on the control of valve body inside cavity Spool and end cap set on control spool both ends;The left overflow valve, right overflow valve, left hydraulic control one-way valve, right hydraulic control one-way valve It is both secured on valve body.Liquid controlled reversing valve module uses such mechanism, and structure is simpler, is more convenient for assembling.And left overflow valve, Right overflow valve, left hydraulic control one-way valve, right hydraulic control one-way valve are both secured on valve body so that whole device volume smaller is more convenient for It carries.
By using said program, a kind of single-action reciprocating hydraulic intensifier of the invention compared with prior art, It has technical effect that:
(1), low-pressure piston of the present invention is when moving to low pressure (LP) cylinder left and right ends extreme position, left piston chamber and right piston chamber Interior oil liquid pressure can also increase, and trigger the overflow valve being connected with the same side pilot operated directional control valve control chamber and open, to promote liquid The spool movement of reversing valve assembly is controlled, flow direction change pushes piston reverses direction to which high pressure oil flows into the plunger shaft of the other side It is mobile, to make pressurized cylinder back and forth continuously export high pressure.
(2), left overflow valve, right overflow valve, left hydraulic control one-way valve, right hydraulic control one-way valve are set to liquid controlled reversing by the present invention On the valve body of valve module, keep total more compact, volume smaller, applicable situation is more extensive, and easily portable.
(3), compared with the existing technology, structure is simpler, operation is relatively reliable by the present invention, and can reach high frequency supercharging Purpose.
Description of the drawings
Fig. 1 is a kind of schematic diagram of single-action reciprocating hydraulic intensifier of the present invention;
Fig. 2 is a kind of schematic diagram of the piston motion of single-action reciprocating hydraulic intensifier of the present invention to right end position;
Fig. 3 is a kind of schematic diagram of the piston motion of single-action reciprocating hydraulic intensifier of the present invention to left position;
Fig. 4 is a kind of structure sectional view of the liquid controlled reversing valve module of single-action reciprocating hydraulic intensifier of the present invention;
Fig. 5 is the A-A sectional views in Fig. 4;
Fig. 6 is the B-B sectional views in Fig. 4.
It is labeled as in figure:P, oil inlet;T, oil return opening;T1, the first oil return opening;T2, the second oil return opening;A, the first hydraulic fluid port; B, the second hydraulic fluid port;H, high-pressure oil outlet;1, in line check valve;2, oil outlet one-way valve;3, high pressure chest;4a, left piston chamber;4b, the right side Plunger shaft;5, high pressure piston;6, low-pressure piston;8a, left overflow valve;8b, right overflow valve;9, reversing valve core;91, the first from left protrusion Ring;92, the second from left protruding ring;93, right two protruding rings;94, a right protruding ring;10a, left hydraulic control one-way valve;10b, right fluid-control one-way Valve;11a, left control chamber;11b, right control chamber.
Specific implementation mode
In order to make the objectives, technical solutions and advantages of the present invention clearer, with reference to specific example and with reference to attached Figure, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit the present invention's Range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid the present invention is unnecessarily obscured Concept.
The single-action reciprocating hydraulic intensifier of the present invention is a preferred embodiment if attached drawing 1 is to shown in Fig. 6.
Single-action reciprocating hydraulic intensifier includes pressurizing pack, liquid controlled reversing valve module.The pressurizing pack includes low Piston 6, high pressure piston 5, the high pressure piston 5 is pressed to be connected with the right both ends of low-pressure piston 6, and on the right side of high pressure piston 5 High pressure chest 3 is formed, left piston chamber 4a and right piston chamber 4b, the high pressure chest 3 are respectively formed in the left and right side of low-pressure piston 6 It is connected to high-pressure oil outlet H by oil outlet one-way valve 2.The high pressure chest 3 is connected to by line check valve 1 with oil inlet P.
The liquid controlled reversing valve module includes valve body, reversing valve core 9, left overflow valve 8a, the right side set on valve body inside cavity Overflow valve 8b, left hydraulic control one-way valve 10a and right hydraulic control one-way valve 10b.The both ends of reversing valve core 9 in the liquid controlled reversing valve module Multiple spaced protruding rings are equipped with on intermediate excircle, the left and right ends of the reversing valve core 9 are respectively formed a left side Control chamber 11a and right control chamber 11b, the liquid controlled reversing valve module are equipped with oil inlet P, oil return inlet T, the first hydraulic fluid port A, second Hydraulic fluid port B.Wherein, the setting of protruding ring meets on the reversing valve core 9:When reversing valve core 9 moves to left, oil inlet P and the first oil Mouth A connections, the second hydraulic fluid port B are connected to oil return inlet T;When reversing valve core 9 moves to right, oil inlet P is connected to the second hydraulic fluid port B, and first Hydraulic fluid port A is connected to oil return inlet T.Concrete methods of realizing is:It is set gradually there are four protruding ring by left-to-right on reversing valve core 9:It is left One protruding ring 91, the second from left protruding ring 92, right two protruding rings 93, a right protruding ring 94, four protruding rings are one whole with reversing valve core 9 Body.There are five hydraulic fluid ports for the lower part setting of reversing valve core 9:It is followed successively by the first oil return inlet T 1, the first hydraulic fluid port A, oil inlet by left-to-right P, the second hydraulic fluid port B, the second oil return inlet T 2, wherein the first oil return inlet T 1 is connected to form oil return inlet T for T2 mouthfuls with the second oil return.When changing When being moved to left to spool 9, oil inlet P and the first hydraulic fluid port A are formed between the second from left protruding ring 92 and right two protruding rings and are connected to, the second oil Mouth B and the second oil return inlet T 2 form connection between right two protruding rings 93 and a right protruding ring 94;When reversing valve core 9 moves to right, First hydraulic fluid port A and the first oil return inlet T 1 form connection, oil inlet P and second between the first from left protruding ring 91 and the second from left protruding ring 92 Hydraulic fluid port B is formed between the second from left protruding ring 92 and right two protruding rings 93 and is connected to.
The oil inlet of the left overflow valve 8a is connected to the first hydraulic fluid port A, the left control of oil return opening and liquid controlled reversing valve module The control port connection of chamber 11a, the oil inlet of left hydraulic control one-way valve 10a, right hydraulic control one-way valve 10b processed;The right overflow valve 8b Oil inlet be connected to the second hydraulic fluid port B, right control chamber 11b, the left hydraulic control one-way valve 10a of oil return opening and liquid controlled reversing valve module Control port, right hydraulic control one-way valve 10b oil inlet connection.The left hydraulic control one-way valve 10a's and right hydraulic control one-way valve 10b Oil return opening is all connected with the oil return opening of fluid-control one-way valve module.In the state that left overflow valve 8a is opened, right hydraulic control one-way valve 10b is opened, and reversing valve core 9 moves to right, and oil inlet P is connected to the second hydraulic fluid port B, and the first hydraulic fluid port A is connected with the first oil return inlet T 1;It is right In the state that overflow valve 8b is opened, left hydraulic control one-way valve 10a is opened, and reversing valve core 9 moves to left, and oil inlet P connects with the first hydraulic fluid port A Logical, the second hydraulic fluid port B is connected to the second oil return inlet T 2.
The operation principle and the course of work of the present invention is as follows:
When low-pressure piston 6 moves right, the reversing valve core 9 of liquid controlled reversing valve module is in P mouthfuls and A mouthfuls even at this time Logical, the B mouthfuls of states being connected to T2 mouthfuls, A mouth of the high pressure oil through liquid controlled reversing valve module enters left piston chamber 4a, pushes low-pressure piston 6 move right, when low-pressure piston 6 moves to extreme right position (as shown in Figure 2), left piston chamber 4a inner fluid pressure liters Height triggers left overflow valve 8a and opens;After left overflow valve 8a is opened, P mouthfuls of fluid enter a left side for reversing valve core 9 through left overflow valve 8a Control chamber 11a, left control chamber 11a are also connected with the control port of right hydraulic control one-way valve 10b, and right hydraulic control one-way valve 10b is opened, The pressure oil of control chamber 11a left in this way pushes reversing valve core 9 to move right, and the fluid of right control chamber 11b is through right hydraulic control one-way valve 10b returns to T mouthfuls, and reversing valve core 9 moves to right position, P mouthfuls and B mouthful it is logical, A mouthfuls and T1 mouthfuls lead to;In this way, fluid is through P mouthfuls, B mouthfuls Low-pressure piston 6 is pushed to be moved to the left into right piston chamber 4b.
In low-pressure piston 6 during being moved to the left, B mouth of the hydraulic oil through liquid controlled reversing valve module enters right piston chamber 4b pushes low-pressure piston 6 to move downward, when low-pressure piston 6 moves to left end extreme position (as shown in Figure 3), right piston chamber 4b inner fluid pressure rises trigger right overflow valve 8b and open;After right overflow valve 8b is opened, P mouthfuls of fluid through right overflow valve 8b into Enter the right control chamber 11b of reversing valve core 9, right control chamber 11b is also connected with the control port of left hydraulic control one-way valve 10a, by left liquid It controls check valve 10a to open, the pressure oil of control chamber 11b right in this way pushes reversing valve core 9 to be moved to the left, the oil of left control chamber 11a Liquid returns to T mouthfuls through left hydraulic control one-way valve 10a, and reversing valve core 9 moves to left position, P mouthfuls and A mouthful it is logical, B mouthfuls and T2 mouthfuls lead to;This Sample, fluid enter left piston chamber 4a through P mouthfuls, A mouthfuls and low-pressure piston 6 are pushed to move right.Repeatedly.
Therefore, booster can be with bilateral reciprocation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, the protection domain being not intended to limit the invention, it is all Within the spirit and principles in the present invention, made by any modification, equivalent replacement, be all included in the scope of protection of the present invention.

Claims (4)

1. a kind of single-action reciprocating hydraulic intensifier comprising pressurizing pack, liquid controlled reversing valve module, the pressurizing pack packet Low-pressure piston, high pressure piston are included, the high pressure piston is connected with the right end of low-pressure piston, and forms height on the right side of high pressure piston Chamber is pressed, is respectively formed left piston chamber and right piston chamber in the left and right side of low-pressure piston, the high pressure chest passes through fuel-displaced unidirectional Valve is connected to high-pressure output port;
The liquid controlled reversing valve module includes reversing valve core, left overflow valve, left hydraulic control one-way valve, right overflow valve and right fluid-control one-way Valve is equipped with multiple spaced protrusions in the liquid controlled reversing valve module on the both ends of reversing valve core and intermediate excircle The left and right ends of ring, the reversing valve core are respectively formed left control chamber and right control chamber, and the liquid controlled reversing valve module is equipped with Oil inlet, oil return opening, the first hydraulic fluid port, the second hydraulic fluid port;
The left piston chamber is connected to the first hydraulic fluid port, and the right piston chamber is connected with the second hydraulic fluid port;
The oil inlet of the left overflow valve is connected to the first hydraulic fluid port, the oil inlet of oil return opening and left control chamber, left hydraulic control one-way valve The control port connection of mouth, right hydraulic control one-way valve;The oil inlet of the right overflow valve is connected to the second hydraulic fluid port, oil return opening and liquid Control the right control chamber of reversing valve assembly, the control port of left hydraulic control one-way valve, the oil inlet connection of right hydraulic control one-way valve;The left side The oil return opening of hydraulic control one-way valve and right hydraulic control one-way valve is all communicated with the oil return opening of liquid controlled reversing valve module;What left overflow valve was opened Under state, right hydraulic control one-way valve is opened, and reversing valve core moves to right, and oil inlet is connected to the second hydraulic fluid port, the first hydraulic fluid port and oil return opening phase Connection;In the state that right overflow valve is opened, left hydraulic control one-way valve is opened, and reversing valve core moves to left, and oil inlet is connected to the first hydraulic fluid port, Second hydraulic fluid port is connected to oil return opening.
2. a kind of single-action reciprocating hydraulic intensifier according to claim 1, which is characterized in that on the reversing valve core The setting of protruding ring meets:When reversing valve core moves to left, oil inlet is connected to the first hydraulic fluid port, and the second hydraulic fluid port is connected to oil return opening; When reversing valve core moves to right, oil inlet is connected to the second hydraulic fluid port, and the first hydraulic fluid port is connected to oil return opening.
3. a kind of single-action reciprocating hydraulic intensifier according to claim 1, which is characterized in that the high pressure chest passes through In line check valve is connected to oil inlet.
4. a kind of single-action reciprocating hydraulic intensifier according to claim 1, which is characterized in that the pilot operated directional control valve Component includes valve body, the end cap set on the control spool of valve body inside cavity and set on control spool both ends;The left overflow valve, Right overflow valve, left hydraulic control one-way valve, right hydraulic control one-way valve are both secured on valve body.
CN201810479825.4A 2018-05-18 2018-05-18 A kind of single-action reciprocating hydraulic intensifier Pending CN108488110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810479825.4A CN108488110A (en) 2018-05-18 2018-05-18 A kind of single-action reciprocating hydraulic intensifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810479825.4A CN108488110A (en) 2018-05-18 2018-05-18 A kind of single-action reciprocating hydraulic intensifier

Publications (1)

Publication Number Publication Date
CN108488110A true CN108488110A (en) 2018-09-04

Family

ID=63354009

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810479825.4A Pending CN108488110A (en) 2018-05-18 2018-05-18 A kind of single-action reciprocating hydraulic intensifier

Country Status (1)

Country Link
CN (1) CN108488110A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030099556A1 (en) * 2001-11-28 2003-05-29 Minibooster Hydraulics A/S Double-acting hydraulic pressure intensifier
CN102287407A (en) * 2011-09-19 2011-12-21 宁波汉商液压有限公司 Double-action reciprocating hydraulic booster
US20150053075A1 (en) * 2013-08-20 2015-02-26 Vianney Rabhi Reversible hydraulic pressure converter employing tubular valves
CN105782147A (en) * 2014-12-15 2016-07-20 西安众智惠泽光电科技有限公司 Double-acting hydraulic control system of supercharging device
CN206338261U (en) * 2016-11-17 2017-07-18 晏万文 Ultrahigh-pressure hydraulic pressure charging system with fast discharging component

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030099556A1 (en) * 2001-11-28 2003-05-29 Minibooster Hydraulics A/S Double-acting hydraulic pressure intensifier
CN102287407A (en) * 2011-09-19 2011-12-21 宁波汉商液压有限公司 Double-action reciprocating hydraulic booster
US20150053075A1 (en) * 2013-08-20 2015-02-26 Vianney Rabhi Reversible hydraulic pressure converter employing tubular valves
CN105782147A (en) * 2014-12-15 2016-07-20 西安众智惠泽光电科技有限公司 Double-acting hydraulic control system of supercharging device
CN206338261U (en) * 2016-11-17 2017-07-18 晏万文 Ultrahigh-pressure hydraulic pressure charging system with fast discharging component

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李壮云: "<液压元件与系统>", 30 September 2011 *

Similar Documents

Publication Publication Date Title
AU762331B2 (en) Compressor arrangement
RU118371U1 (en) PISTON PUMP COMPRESSOR
KR20110093638A (en) Decompression switching valve
EP1344946A2 (en) Double-acting pressure intensifying cylinder and method for intensifying pressure in the cylinder
CN106414951B (en) Engine
CN102287407B (en) Double-action reciprocating hydraulic booster
CN206129760U (en) Pilot operated directional control valve integrated device
CN103256201B (en) Coaxial motive liquid booster body and gas boosting method in the same way
CN105190140A (en) Check valve with improved response time
US6210131B1 (en) Fluid intensifier having a double acting power chamber with interconnected signal rods
CN104384289B (en) Large-tonnage short-stroke inner high pressure forming machine
JP2004360701A (en) Linear compressor
CN201218248Y (en) Multifunctional integration composite valve
US2781775A (en) Limited capacity check valve
CN1322240C (en) Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor
WO2016037500A1 (en) Reciprocating plunger-type gas compressor and method
CN102374148A (en) Double acting fluid pump
CN102678507B (en) Double-acting hydraulic ejecting type vacuumizing and compressing device of double cylinders
CN201148948Y (en) Magnetic control automatic reversing controlled gas drive hydraulic pump
GB2490180B (en) Valve assembly and method of pumping a fluid
CA2379641A1 (en) Double acting, two-stage pump
CN100360813C (en) Integrated electro-hydraulic actuator capable of carrying out quick action and adjustment
CN201401386Y (en) Parallel-connection type gas-liquid booster cylinder
MXPA02009808A (en) Apparatus for compressing fluid.
AU2006275892B2 (en) Reciprocating piston pump with air valve, detent and poppets

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20180904

RJ01 Rejection of invention patent application after publication