CN108131347B - No leakage three-way pressure reducing valve - Google Patents

No leakage three-way pressure reducing valve Download PDF

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Publication number
CN108131347B
CN108131347B CN201711420136.8A CN201711420136A CN108131347B CN 108131347 B CN108131347 B CN 108131347B CN 201711420136 A CN201711420136 A CN 201711420136A CN 108131347 B CN108131347 B CN 108131347B
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CN
China
Prior art keywords
valve
mouthfuls
channel
spring
push rod
Prior art date
Application number
CN201711420136.8A
Other languages
Chinese (zh)
Other versions
CN108131347A (en
Inventor
陈艳艳
Original Assignee
江苏佳佩环保机械设备有限公司
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Filing date
Publication date
Application filed by 江苏佳佩环保机械设备有限公司 filed Critical 江苏佳佩环保机械设备有限公司
Priority to CN201711420136.8A priority Critical patent/CN108131347B/en
Publication of CN108131347A publication Critical patent/CN108131347A/en
Application granted granted Critical
Publication of CN108131347B publication Critical patent/CN108131347B/en

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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
    • F15B13/025Pressure reducing valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F16K11/105Three-way check or safety valves with two or more closure members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0406Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of balls
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/044Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure

Abstract

The invention discloses a kind of No leakage three-way pressure reducing valves, it include valve body, A mouthfuls are provided on valve body, P mouthfuls and R mouthfuls, first valve channel is set in valve body, second valve channel, third valve channel and first runner, regulation component is provided in first valve channel, push rod and the first check valve assembly, controllable P mouthfuls and A mouthfuls of the on-off of first check valve assembly, second one-way valve component is equipped in second valve channel, controllable A mouthfuls and R mouthfuls of the on-off of second one-way valve component, straight pin and compression bar are provided in third valve channel, straight pin is connected it with valve body by the through-hole among compression bar, push rod slides up and down the open and close of controllable first check valve assembly, and the open and close that control second one-way valve component are can control on compression bar rotary action to mandril by groove thereon.The advantage is that: simple and reasonable for structure;Manufacturing cost is low, stable.

Description

No leakage three-way pressure reducing valve

Technical field

The present invention relates to pressure reducing valve manufacturing technology field, especially No leakage three-way pressure reducing valve.

Background technique

Pressure reducing valve is one of indispensable critical elements in hydraulic system, existing two-way pressure reducing valve and three-way pressure reducing valve Substantially slide valve form is used, in the case that decompression branch road needs pressure maintaining or load to increase, working hole pressure increases, and causes There are drainings to drain tap or pressure oil port for pressure-reduction outlet, prevent working oil path is from pressure maintaining, it is necessary to use accumulator or double Pressure holding function is realized to the solenoid valve of cut-off, this will cause system structure complexity, and cost improves.

Summary of the invention

The technical problem to be solved by the invention for the present situation of prior art is to provide simple and reasonable for structure;It manufactures into This low, stable No leakage three-way pressure reducing valve.

The technical scheme of the invention to solve the technical problem is:

No leakage three-way pressure reducing valve includes valve body, and A mouthfuls, P mouthfuls and R mouthfuls are provided on valve body, is provided in valve body perpendicular To the first valve channel and the second valve channel, P mouthfuls are located at the first valve channel lower part, and A mouthful under the second valve channel Portion, lateral first runner and third valve channel are additionally provided on valve body, and first runner runs through the first valve channel and the second valve It communicates in the middle part of body channel, third valve channel and the first valve channel, is communicated in the middle part of the second valve channel and third valve channel, R mouthfuls are located at third valve channel right end;Regulation component, push rod and the first check valve are from top to bottom provided in first valve channel Component, the first check valve assembly are located at the lower part of the first valve channel and first runner through part to control the on-off of P mouthfuls with A mouthfuls For push rod in the trend for opening the first check valve assembly under the active force of regulation component, push rod overcomes regulation component active force The first check valve assembly progressively closes off when upward sliding, and groove is equipped in the middle part of push rod;It is unidirectional that second is equipped in second valve channel Valve module and the mandril that can slide up and down, mandril, which moves downward, can open the second one-way valve component, second one-way valve group It is connected to R mouthfuls for A mouthfuls after part is opened;Compression bar and straight pin are equipped in third valve channel, straight pin passes through the through-hole in the middle part of compression bar Compression bar is connect with valve body, compression bar one end is protruded into the groove of the push rod, and the compression bar other end is matched with mandril, and push rod can lead to It crosses groove control compression bar and rotates upwardly and downwardly the open and close for pushing mandril to control second one-way valve component along straight pin axis.

The technical measures of optimization further include:

The first above-mentioned check valve assembly includes the first valve seat, is provided in first valve seat and the first valve port phase First steel ball of cooperation, offers the first through flow hole being connected with P mouthfuls, the first valve port on the first valve seat, under the first valve seat End is provided with the first screw plug, the first spring base is provided in first screw plug, the first steel ball is placed on the first spring base, described The first spring is provided between first spring base and the first screw plug.

Above-mentioned second one-way valve component includes the second steel ball compatible with the second valve port on valve body, under the second steel ball Portion is provided with second spring seat, and second steel ball is placed on second spring seat, the lower slide of second spring seat insertion the In two screw plug inner holes, second spring is provided between second spring seat and the second screw plug, it is through-flow that the second screw plug lower part is provided with second Hole.

Above-mentioned regulation component includes big spring, is equipped with matched big spring seat, the big bullet below big spring It is against on pressure regulation bar above spring, pressure regulation bar is threaded in adjusting set, and the adjusting set is spirally connected with valve body.

The first above-mentioned through flow hole radially opens up.

The lower part two sides of above-mentioned push rod are in the arcuate structure of indent.

The second above-mentioned through flow hole is opened up along axial direction.

No leakage three-way pressure reducing valve of the invention, simple and reasonable for structure, manufacturing cost is low, stable.It is at A mouthfuls With P mouthfuls between be provided with the first valve port, the second valve port is provided between A mouthfuls and R mouthfuls, the first steel ball is matched with the first valve port, Second steel ball is matched with the second valve port;When pressure of the A mouthfuls of pressure lower than big spring setting, active force of the push rod in big spring Downward motion opens the first steel ball, opens the first valve port, and P mouthfuls are connected with A mouthfuls;When A mouthfuls of pressure rise to greater than big spring When the pressure of setting, in the case where A mouthfuls of oil pressure act on, push rod overcomes the active force of big spring to move upwards, and push rod and the first steel ball are de- From the first steel ball, which moves upwards to be bonded with the first valve port under the action of the first spring, makes its closing, in this way, the first steel ball and One valve port linear sealing, the second steel ball and the second valve port linear sealing, ensure that A mouthfuls of leak-free pressures;A mouthfuls of pressure changes because of load And when changing, when A mouthfuls of pressure rises have been more than the active force of big spring 7, push rod, which continues up, makes groove and compression bar Contact, push rod push compression bar rotation to push mandril and open the second steel ball, and the second steel ball closes No leakage after A mouthfuls of pressure declines, makes This three-way pressure reducing valve can be run steadily in the long term.

Detailed description of the invention

Fig. 1 is structural schematic diagram of the invention;

Fig. 2 is partial sectional view in Fig. 1.

Specific embodiment

The present invention will be described in further detail below with reference to the embodiments of the drawings.

It is as shown in Figure 1 to Figure 2 structural schematic diagram of the invention,

Appended drawing reference therein are as follows: A mouthfuls, P mouthfuls, R mouthfuls, valve body 1, the second valve port 1a, the first valve channel 11, the second valve body Channel 12, first runner 13, third valve channel 14, regulation component 2, big spring seat 21, big spring 22, adjusting set 23, pressure regulation Bar 24, the first check valve assembly 3, the first valve port 3a, the first through flow hole 3b, the first valve seat 31, the first steel ball 32, the first spring base 33, the first spring 34, the first screw plug 35, push rod 4, second one-way valve component 5, the second through flow hole 5a, the second steel ball 51, the second bullet Spring abutment 52, second spring 53, the second screw plug 54, mandril 6, compression bar 7, straight pin 8.

As shown in Figure 1 to Figure 2,

No leakage three-way pressure reducing valve includes valve body 1, A mouthfuls, P mouthfuls and R mouthfuls is provided on valve body 1, setting in valve body 1 There are vertical the first valve channel 11 and the second valve channel 12, P mouthfuls are located at 11 lower part of the first valve channel, and A mouthfuls are located at second 12 lower part of valve channel, is additionally provided with lateral first runner 13 and third valve channel 14 on valve body 1, and first runner 13 is through the It is communicated in the middle part of one valve channel 11 and the second valve channel 12, third valve channel 14 and the first valve channel 11, the second valve body It is communicated in the middle part of channel 12 and third valve channel 14, R mouthfuls are located at third valve channel right end;First valve channel 11 of valve body 1 It is inside from top to bottom provided with regulation component 2, push rod 4 and the first check valve assembly 3, the first check valve assembly 3 is located at the first valve body The lower part of channel 11 and 13 through part of first runner is to control the on-off of P mouthfuls with A mouthfuls, and push rod 4 is under the active force of regulation component In the trend for opening the first check valve assembly 3, the first unidirectional valve group when push rod 4 overcomes regulation component active force upward sliding Part 3 progressively closes off, and groove 41 is equipped in the middle part of push rod 4;It is equipped with second one-way valve component 5 in second valve channel 12 and downslide can be gone up Dynamic mandril 6, mandril 6, which moves downward, can open second one-way valve component 5, A mouthfuls and R mouthfuls after the unlatching of second one-way valve component 5 Connection;Compression bar 7 and straight pin 8 are equipped in third valve channel 14, straight pin 8 passes through the through-hole in the middle part of compression bar for compression bar and valve body Connection, 7 one end of compression bar are protruded into the groove 41 of push rod 4, and 7 other end of compression bar is matched with mandril 6, and push rod 4 can pass through groove 41 Control compression bar rotates upwardly and downwardly the open and close for pushing mandril 6 to control second one-way valve component 5 along 8 axis of straight pin.

In embodiment, the first check valve assembly 3 includes the first valve seat 31, is provided in the first valve seat 31 and the first valve port The first steel ball 32 that 3a is matched offers the first through flow hole 3b being connected with P mouthfuls, the first valve port 3a on the first valve seat 31, The lower end of first valve seat 31 is provided with the first screw plug 35, and the first spring base 33, the first steel ball 32 are provided in first screw plug 35 It is placed on the first spring base 33, the first spring 34 is provided between the first spring base 33 and the first screw plug 35.

In embodiment, second one-way valve component 5 includes the second steel ball 51 compatible with the second valve port 1a on valve body, and second The lower part of steel ball 51 is provided with second spring seat 52, and the second steel ball 51 is placed on second spring seat 52, under second spring seat 52 Portion is slidably inserted into 54 inner hole of the second screw plug, is provided with second spring 53 between second spring seat 52 and the second screw plug 54, and second 54 lower part of screw plug is provided with the second through flow hole 5a.

In embodiment, regulation component 2 includes big spring 22, is equipped with matched big spring seat below big spring 22 21, it is against on pressure regulation bar 24 above big spring 22, pressure regulation bar 24 is threaded in adjusting set 23, adjusting set 23 and 1 spiral shell of valve body It connects.By the decrement of the adjustable big spring 22 of pressure regulation bar 24, to adjust A mouthfuls of output pressure size.

In embodiment, the first through flow hole 3b is radially opened up.

In embodiment, the lower part two sides of push rod 4 are in the arcuate structure of indent.

In embodiment, the second through flow hole 5a is axially disposed.

Working principle:

A mouthfuls, P mouthfuls and R mouthfuls are provided on this three-way pressure reducing valve, be provided between A mouthfuls and P mouthfuls 3a, A mouthfuls of the first valve port with The second valve port 1a is provided between R mouthfuls, the first steel ball 32 is matched with the first valve port 3a, the second steel ball 51 and the second valve port 1a phase Cooperation.The effect of big spring 22 is responsible for the pressure after A mouthfuls of decompressions.

Oil liquid enters from P mouthfuls, when A mouthfuls of pressure are lower than the pressure that big spring 22 is set, effect of the push rod 4 in big spring 22 Power downward motion opens the first steel ball 32, opens the first valve port 3a, P mouthfuls of oil liquid are through the first through flow hole on the first valve seat 31 3b, the first valve port 3a enter A mouthfuls;When A mouthfuls of pressure rise to the pressure greater than the setting of big spring 22, in the case where A mouthfuls of oil pressure act on, Push rod 4 overcomes the active force of big spring 22 to move upwards, and is detached from push rod 4 and the first steel ball 32, and the first steel ball 32 is first It moves upwards to be bonded with the first valve port 3a under the action of spring 34 and makes its closing, in this way, P mouthfuls of oil liquid will not flow into A mouthfuls again, and because For the first steel ball 32 and the first valve port 3a linear sealing, the second steel ball 51 and the second valve port 1a linear sealing, A mouthfuls of leak-free pressures.

In the case where the first valve port 3a is closed by the first steel ball 32, if A mouthfuls of pressure becomes because loading variation When change, when A mouthfuls of pressure rises have been more than the active force of big spring 22, push rod 4 is continued up under oil pressure effect until recessed Slot 41 offsets with compression bar 7, and push rod 4 continues up, and compression bar 7 under the promotion of push rod 4 around the axis both clockwise of straight pin 8 The upper end that rotation is pressed onto mandril 6 makes the second valve so that mandril 6 overcomes the active force of second spring 53 to open the second steel ball 51 Mouthful 1a is opened, and A mouthful of oil liquid will flow into R mouthfuls by the second through flow hole 5a, the second valve port 1a, under such A mouthfuls of pressure meeting horse back Drop, after A mouthfuls of pressure declines, under the active force of big spring 22, push rod 4, which moves down, makes the second valve port 4a and the second steel ball 41 shape again At sealing, to maintain A mouthfuls of pressure.When A mouthfuls of pressure reductions are less than the active force of big spring 22, in the active force of big spring 22 Under, push rod 4, which moves downward, opens the first steel ball 32, and the first valve port 3a is opened, and P mouthfuls of oil liquid flows into A mouthfuls to A mouthfuls of progress oil pressure Supplement.

Highly preferred embodiment of the present invention has illustrated, and the various change or remodeling made by those of ordinary skill in the art are not It can depart from the scope of the present invention.

Claims (7)

1. a kind of No leakage three-way pressure reducing valve includes valve body (1), A mouthfuls, P mouthfuls and R mouthfuls is provided on the valve body (1), It is characterized in that: being provided with vertical the first valve channel (11) and the second valve channel (12), the P in the valve body (1) Mouth is located at the first valve channel (11) lower part, and described A mouthfuls is located at the second valve channel (12) lower part, also sets on the valve body (1) Have a lateral first runner (13) and third valve channel (14), the first runner (13) through the first valve channel (11) and It is communicated in the middle part of second valve channel (12), the third valve channel (14) and the first valve channel (11), second valve body It is communicated in the middle part of channel (12) and the third valve channel (14), described R mouthfuls is located at the third valve channel right end;The valve Regulation component (2), push rod (4) and the first check valve assembly are from top to bottom provided in the first valve channel (11) of body (1) (3), first check valve assembly (3) be located at the lower part of first valve channel (11) and first runner (13) through part with The on-off of P mouthfuls with A mouthfuls is controlled, the push rod (4) is under the active force of regulation component and opens the first check valve assembly (3) Trend, the first check valve assembly (3) progressively closes off when push rod (4) overcomes regulation component active force upward sliding, the push rod (4) middle part is equipped with groove (41);It is equipped with second one-way valve component (5) in second valve channel (12) and can slide up and down Mandril (6), the mandril (6), which moves downward, can open the second one-way valve component (5), the second one-way valve component (5) it is connected to R mouthfuls for A mouthfuls after opening;Compression bar (7) and straight pin (8), the straight pin are equipped in the third valve channel (14) (8) it passes through the through-hole in the middle part of compression bar to connect compression bar with valve body, the groove of the push rod (4) is protruded into described compression bar (7) one end (41) in, compression bar (7) other end is matched with the mandril (6), and the push rod (4) can be controlled by the groove (41) Compression bar rotates upwardly and downwardly the open and close for pushing mandril (6) to control second one-way valve component (5) along straight pin (8) axis.
2. No leakage three-way pressure reducing valve according to claim 1, it is characterized in that: first check valve assembly (3) wraps It has included the first valve seat (31), has been provided with the first steel ball matched with the first valve port (3a) in first valve seat (31) (32), the first through flow hole (3b) being connected with P mouthfuls, the first valve port (3a) is offered on first valve seat (31), first The lower end of valve seat (31) is provided with the first screw plug (35), is provided with the first spring base (33) in first screw plug (35), described First steel ball (32) is placed on first spring base (33), is set between first spring base (33) and the first screw plug (35) It is equipped with the first spring (34).
3. No leakage three-way pressure reducing valve according to claim 1, it is characterized in that: the second one-way valve component (5) wraps It includes compatible second steel ball (51), the lower part of the second steel ball (51) with the second valve port (1a) on valve body and is provided with second spring seat (52), second steel ball (51) is placed on the second spring seat (52), and the lower part of the second spring seat (52) is sliding In dynamic insertion the second screw plug (54) inner hole, the second bullet is provided between the second spring seat (52) and second screw plug (54) Spring (53), the second screw plug (54) lower part are provided with the second through flow hole (5a).
4. No leakage three-way pressure reducing valve according to claim 1, it is characterized in that: the regulation component (2) includes big bullet Spring (22), big spring (22) lower section are equipped with matched big spring seat (21), are against above the big spring (22) On pressure regulation bar (24), the pressure regulation bar (24) is threaded on adjusting set (23), the adjusting set (23) and the valve body (1) It is spirally connected.
5. No leakage three-way pressure reducing valve according to claim 2, it is characterized in that: first through flow hole (3b) is radially opened If.
6. No leakage three-way pressure reducing valve according to claim 1, it is characterized in that: the lower part two sides of the push rod (4) are in The arcuate structure of indent.
7. No leakage three-way pressure reducing valve according to claim 3, it is characterized in that: second through flow hole (5a) is along axial direction It opens up.
CN201711420136.8A 2017-12-25 2017-12-25 No leakage three-way pressure reducing valve CN108131347B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711420136.8A CN108131347B (en) 2017-12-25 2017-12-25 No leakage three-way pressure reducing valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711420136.8A CN108131347B (en) 2017-12-25 2017-12-25 No leakage three-way pressure reducing valve

Publications (2)

Publication Number Publication Date
CN108131347A CN108131347A (en) 2018-06-08
CN108131347B true CN108131347B (en) 2019-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711420136.8A CN108131347B (en) 2017-12-25 2017-12-25 No leakage three-way pressure reducing valve

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CN201144914Y (en) * 2007-12-29 2008-11-05 上海立新液压有限公司 Pilot type pressure reducing valve
CN203258135U (en) * 2013-05-17 2013-10-30 上海七洋液压机械有限公司 Two-section type reducing valve

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KR100656278B1 (en) * 2006-02-17 2006-12-11 주식회사 노비타 Pressure reducing valve
CN101655165B (en) * 2008-08-21 2012-01-04 上海立新液压有限公司 Novel three-way pressure reducing valve
US8833395B2 (en) * 2012-10-09 2014-09-16 Chen-Yuan Weng Pressure relief valve
CN203223431U (en) * 2013-02-20 2013-10-02 北京海卓力金液压技术有限公司 Threaded plug-in type three-way reducing valve
CN203880163U (en) * 2014-05-16 2014-10-15 浙江华益机械有限公司 Leak-free pressure reducing valve
CN104373403A (en) * 2014-11-19 2015-02-25 上海立新液压有限公司 Plugging tee-type proportional pressure reducing valve
CN205311583U (en) * 2015-12-14 2016-06-15 武汉元丰汽车电控系统有限公司 Closed relief pressure valve
CN205383294U (en) * 2016-03-19 2016-07-13 深圳市家乐士净水科技有限公司 Relief pressure valve is exempted from to transfer in tee bend
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CN206290516U (en) * 2016-12-20 2017-06-30 石家庄市液压有限责任公司 A kind of balanced valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201144914Y (en) * 2007-12-29 2008-11-05 上海立新液压有限公司 Pilot type pressure reducing valve
CN203258135U (en) * 2013-05-17 2013-10-30 上海七洋液压机械有限公司 Two-section type reducing valve

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Effective date of registration: 20191101

Address after: No.18, Daiwang Road, Chengdong Industrial Park, Taixing Economic Development Zone, Taizhou City, Jiangsu Province

Applicant after: Jiangsu Jiapei Environmental Protection Equipment Co., Ltd.

Address before: 315000 Zhejiang province Ningbo city Ningbo high tech Zone Juxian Road No. 555 building 035 room 18-1 No. 013 station

Applicant before: Ningbo Wen fan electrical and Mechanical Technology Development Co., Ltd.

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