CN110425305B - Pressure relief valve and method for controlling pressure of pressure relief valve - Google Patents

Pressure relief valve and method for controlling pressure of pressure relief valve Download PDF

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Publication number
CN110425305B
CN110425305B CN201910920965.5A CN201910920965A CN110425305B CN 110425305 B CN110425305 B CN 110425305B CN 201910920965 A CN201910920965 A CN 201910920965A CN 110425305 B CN110425305 B CN 110425305B
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China
Prior art keywords
relief valve
pressure relief
pressure
inlet
valve body
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CN201910920965.5A
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CN110425305A (en
Inventor
林敬国
李文广
袁彬
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to CN201910920965.5A priority Critical patent/CN110425305B/en
Publication of CN110425305A publication Critical patent/CN110425305A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
    • F16K11/056—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with ball-shaped valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F16K31/007—Piezoelectric stacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

The invention belongs to the technical field of engine manufacturing, and particularly relates to a pressure relief valve and a method for controlling the pressure of the pressure relief valve. The pressure relief valve of the present invention comprises: the front end is provided with an inlet, a first outlet and a second outlet; the pressure relief valve body is provided with an oil drainage port and an inlet, the inlet is communicated with the second outlet, and a sealing ball for blocking the inlet is arranged in the pressure relief valve body; and the controller controls the pushing unit to drive the sealing ball to be far away from or tightly press the inlet. According to the pressure relief valve, the controller controls the pushing unit to drive the sealing ball to be far away from or press the inlet, the controller controls the sealing ball to be far away from or press the inlet, the specific precision of the pressure relief valve can be specifically controlled, the pressure relief valve is adjusted according to the working state, the oil pressure can be controlled, the high-load state of a lubricating system can be relieved, and the pressure relief valve has the advantages of convenience in use and cost saving.

Description

Pressure relief valve and method for controlling pressure of pressure relief valve
Technical Field
The invention belongs to the technical field of engine manufacturing, and particularly relates to a pressure relief valve and a method for controlling the pressure of the pressure relief valve.
Background
The pressure release valve used in the engine oil main oil supply channel is a mechanical valve as shown in figure 1, before installation and use, an adjusting block 9 is adjusted according to required pressure, a pre-tightening spring 3 is tightly pressed or unscrewed, and the pre-tightening force of the pre-tightening spring 3 is adjusted, so that the pre-tightening force of an adjusting sealing ball 2 is achieved, when the pressure release valve is used, when oil pressure at an inlet and a first outlet exceeds the pre-tightening force of the pre-tightening spring, the sealing ball 2 leaves a sealing seat of a pressure release valve body 8, the oil pressure at the inlet and the first outlet is not beyond the limit value, and discharged oil flows out of an oil drainage port.
The pressure relief value of the conventional pressure relief valve cannot be adjusted in the use process. In the actual working process of the engine, the rotating speed working range of the engine is wide, the equipped oil pump meets the requirements of the most harsh working conditions of the engine, for example, the requirement on the required pressure is highest under the conditions of a certain rotating speed and the maximum load, the threshold value of the equipped pressure release valve is higher, but the high pressure is not required under most working conditions.
Adverse factors caused by high engine oil pressure: (1) and the high engine oil pressure causes the power of the engine oil pump to be higher when the engine oil pump works, and more engine power is consumed. (2) And the engine oil lubricating system works in a high-load state for a long time, and has larger abrasion.
The conventional pressure relief valve cannot adjust a threshold value according to a working state and cannot control the oil pressure.
Disclosure of Invention
The invention aims to at least solve the problems that the conventional pressure relief valve cannot adjust a threshold value according to the working state and cannot control the oil pressure. The purpose is realized by the following technical scheme:
a first aspect of the invention proposes a pressure relief valve comprising:
the front end is provided with an inlet, a first outlet and a second outlet;
the pressure relief valve body is provided with an oil drainage port and an inlet, the inlet is communicated with the second outlet, and a sealing ball for blocking the inlet is arranged in the pressure relief valve body;
and the controller controls the pushing unit to drive the sealing ball to be far away from or tightly press the inlet.
According to the pressure relief valve, the controller controls the pushing unit to drive the sealing ball to be far away from or press the inlet, the controller controls the sealing ball to be far away from or press the inlet, the specific precision of the pressure relief valve can be specifically controlled, the pressure relief valve is adjusted according to the working state, the oil pressure can be controlled, the high-load state of a lubricating system can be relieved, and the pressure relief valve has the advantages of convenience in use and cost saving.
In addition, the pressure relief valve according to the present invention may have the following additional features:
in some embodiments of the invention, the controller is connected to a signal acquisition device or ECU unit that is capable of obtaining engine speed and engine torque.
In some embodiments of the invention, the signal acquisition device comprises a pressure sensor disposed within the front head, the pressure sensor disposed in correspondence with the inlet;
the controller controls the pushing unit according to the pressure of the engine oil, the engine speed and the engine torque.
In some embodiments of the present invention, the pushing unit includes a driving member and a fixing seat, the sealing ball is disposed on the fixing seat, and the pushing unit drives the fixing seat to move along a length direction of the pressure relief valve body.
In some embodiments of the present invention, the driving member includes a piezoelectric stack connected to the fixing seat, and the piezoelectric stack can drive the fixing seat to move along a length direction of the pressure relief valve body.
In some embodiments of the present invention, the driving member includes a rotating base connected to the fixing base, and the rotating base is driven by the adjusting motor to move along a length direction of the pressure relief valve body.
In some embodiments of the present invention, an inner thread is disposed on an inner wall of the pressure relief valve body, an outer thread matching the inner thread is disposed on the rotating base, and the rotating base moves along a length direction of the pressure relief valve body through the outer thread and the inner thread.
In some embodiments of the present invention, the sealing ball is disposed on the fixing seat through a pre-tightening spring, and the fixing seat is provided with a limiting post for sleeving the spring.
In another aspect, the present invention further provides a method for controlling pressure of a pressure relief valve, where the pressure relief valve is provided with any one of the pressure relief valves, where the method includes the following steps:
the controller controls the pushing unit to drive the sealing ball to be far away from or tightly press the inlet.
In some embodiments of the present invention, by measuring the pressure of the oil, the engine speed, and the engine torque, the measured pressure is adjusted to the corresponding pressure by the controller after comparing the pressure corresponding to the engine speed and the engine torque with the measured pressure.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 schematically shows a schematic structural view of a pressure relief valve according to the background art of the present invention;
fig. 2 schematically shows a structural view of a pressure relief valve according to a first embodiment of the invention;
fig. 3 schematically shows a structural view of a pressure relief valve according to a second embodiment of the present invention.
The reference numerals in the drawings denote the following:
1: a front end; 2: a sealing ball; 3: pre-tightening the spring; 4: a ball bearing; 5: a motor; 6: rotating the base; 7: a fixed seat; 8: a pressure relief valve body; 9: an adjusting block; 10: a piezoelectric stack;
11: an inlet; 12: a first outlet; 13: a second outlet; 14: an inlet; 15: an oil drainage port;
20: a pressure sensor; 21: a controller; 22: an ECU unit.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Example one
As shown in fig. 2, the relief valve in the present embodiment includes: the device comprises a front end head 1, wherein an inlet 11, a first outlet 12 and a second outlet 13 are arranged on the front end head 1;
the pressure relief valve body 8 is provided with an oil drainage port 15 and an inlet 14, the inlet 14 is communicated with the second outlet 13, and a sealing ball 2 for blocking the inlet 14 is arranged in the pressure relief valve body 8;
and the controller 21, wherein the controller 21 controls the pushing unit to drive the sealing ball 2 to be far away from or press the inlet 14.
The front end head 1 is provided with an inlet 11, a first outlet 12 and a second outlet 13, the inlet 11, the first outlet 12 and the second outlet 13 are arranged at three ends of the front end head 1, the structure is similar to a three-way valve, engine oil enters from the inlet 11 and is discharged from the first outlet 12 and the second outlet 13; an oil drainage port 15 and an inlet 14 are formed in the pressure relief valve body 8, the inlet 14 is communicated with the second outlet 13, and engine oil enters through the inlet 14 and is discharged from the oil drainage port 15. The sealing ball 2 can be a sealing steel ball.
The controller 21 controls the sealing ball 2 to be far away from or press the inlet 14, so that the specific precision of the pressure release valve can be controlled according to specific parameters, the pressure release valve can be adjusted according to the working state, and the oil pressure can be controlled.
In some embodiments of the present invention, the controller 21 is connected to a signal acquisition device or ECU unit 22, and the signal acquisition device or ECU unit 22 can obtain the engine speed and the engine torque.
Specifically, the signal may be acquired by a signal acquisition device, or the controller 21 may be directly connected to the ECU unit 22, and the engine speed and the engine torque may be read by the ECU unit 22.
In some embodiments of the present invention, the signal acquisition device comprises a pressure sensor 20 disposed in the front head 1, the pressure sensor 20 being disposed in correspondence with the inlet 11; the controller 21 controls the pushing unit according to the pressure of the engine oil, the engine speed, and the engine torque.
Specifically, the pressure sensor 20 is used to read the pressure sensor 20 in the front head 1, and the pressure sensor 20 may be used to collect the oil pressure value. After the rotating speed and the torque of the engine are measured, corresponding pressure values can be obtained, and the corresponding pressure values are compared with the measured pressure values, so that the pushing unit is accurately controlled.
In some embodiments of the present invention, the pushing unit includes a driving member and a fixing seat 7, the sealing ball 2 is disposed on the fixing seat 7, and the pushing unit drives the fixing seat 7 to move along the length direction of the pressure relief valve body 8.
Specifically, fixing base 7 moves along the length direction of pressure release valve body 8, can drive ball sealer 2 and keep away from or compress tightly import 14.
In some embodiments of the present invention, the driving member includes a piezoelectric stack 10 connected to the fixing seat 7, and the piezoelectric stack 10 can drive the fixing seat 7 to move along the length direction of the pressure relief valve body 8.
Specifically, the piezoelectric stack 10 has an inherent property that when a certain voltage is applied across the piezoelectric stack 10, the piezoelectric stack 10 generates a certain displacement of extension or contraction according to the direction and magnitude of the applied voltage. The magnitude of the displacement is proportional to the magnitude of the voltage across the terminals. The piezoelectric stack 10 is located between the fixing seat 7 and the adjusting block 9, and can move along the length direction of the pressure relief valve body 8.
In some embodiments of the present invention, the sealing ball 2 is disposed on the fixing seat 7 through the pre-tightening spring 3, and the fixing seat 7 is provided with a limiting post for sleeving the spring.
When the pressure of the front end head 1 exceeds the pressure required by the system, the controller 21 controls the piezoelectric stack 10 to move in the direction away from the pre-tightening spring 3, so that the sealing steel ball leaves the front end head 1, the liquid of the front end head 1 enters the cavity on the right side of the sealing steel ball, the oil pressure is removed from the oil drainage port 15, the displacement of the piezoelectric stack 10 is controlled according to the required oil pressure, and the oil pressure of the inlet 11 of the front end head 1 is kept at the required pressure.
In another aspect, the present invention further provides a method for controlling pressure of a pressure relief valve, where the pressure relief valve includes any one of the pressure relief valves described above, where the method includes:
the controller 21 controls the pushing unit to move the sealing ball 2 away from or press the inlet 14.
In some embodiments of the present invention, by measuring the pressure of the oil, the engine speed, and the engine torque, the pressure corresponding to the engine speed and the engine torque is compared with the measured pressure, and then the measured pressure is adjusted to the corresponding pressure by the controller 21.
Example two
As shown in fig. 3, in some embodiments of the present invention, the driving member includes a rotating base 6 connected to a fixed seat 7, and the rotating base 6 is driven by the adjusting motor 5 to move along the length direction of the pressure relief valve body 8.
Rotating base 6 can remove about the relief pressure valve is internal, when motor 5 is rotatory as required, drives rotating base 6 rotatory, and rotating base 6 passes through ball bearing 4 and is connected with fixing base 7, drives fixing base 7 and removes to can drive ball sealer 2 and keep away from or compress tightly import 14.
In some embodiments of the present invention, an inner wall of the pressure relief valve body 8 is provided with an inner thread, an outer thread matching the inner thread is provided on the rotating base 6, and the rotating base 6 moves along the length direction of the pressure relief valve body 8 through the outer thread and the inner thread.
The rotating base 6 is provided with an external thread, and can move left and right in the internal thread at the tail end of the pressure relief valve body 8, so that the rotating base 6 can move left and right, and the pre-tightening spring 3 can move left and right, so that the sealing steel ball can be pressed or kept away from the front end head 1.
When the pressure of current end 1 surpassed the pressure that the system required, controller 21 control motor 5 moved to the direction of keeping away from pretension spring 3 to make sealed steel ball leave front end 1, thereby make entry 11 liquid get into the cavity on sealed steel ball right side, unload the oil pressure from draining port 15, according to the size of demand oil pressure, the displacement size of control adjustment motor 5 makes the oil pressure of entry 11 keep on the pressure of a demand. The rest of the embodiments are the first embodiment, and are not described herein again.
When the pressure relief valve is used, the controller 21 controls the valve body control actuating mechanism, namely the fixed seat 7, the actual target pressure point pressure value measured by the source of the input signal of the pressure relief valve is predicted through the rotating speed and the torque value input on the engine, and the target pressure value required by the system is predicted. The rotation speed is an engine rotation speed (which may be converted into a rotation speed of the pressure generation source pump), and the larger the rotation speed is, the larger the operating rotation speed of the pressure source pump body is, and the larger the generated hydraulic pressure is. The torque represents the magnitude of the engine load, and generally speaking, the greater the engine load, the greater the oil pressure required, and conversely, the smaller the engine load, the smaller the oil pressure required, at the same speed. The engine oil pressure is precisely controlled, so that the engine oil pressure is controlled in a required range.
In summary, the controller of the pressure relief valve of the present invention controls the pushing unit to drive the sealing ball to move away from or press against the inlet, and the controller controls the sealing ball to move away from or press against the inlet, so as to specifically control the specific precision of the pressure relief valve, adjust the pressure relief valve according to the working state, control the oil pressure, and reduce the high load state of the lubrication system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. A pressure relief valve, comprising:
the front end is provided with an inlet, a first outlet and a second outlet;
the pressure relief valve body is provided with an oil drainage port and an inlet, the inlet is communicated with the second outlet, and a sealing ball for blocking the inlet is arranged in the pressure relief valve body;
the controller controls the pushing unit to drive the sealing ball to be far away from or tightly press the inlet;
the controller is connected with a signal acquisition device or an ECU unit, and the signal acquisition device or the ECU unit can obtain the rotating speed and the torque of the engine;
the signal acquisition device comprises a pressure sensor arranged in the front end head, and the pressure sensor is arranged corresponding to the inlet;
the controller controls the pushing unit according to the pressure of the engine oil, the engine speed and the engine torque.
2. The pressure relief valve according to claim 1, wherein the pushing unit includes a driving member and a fixing seat, the sealing ball is disposed on the fixing seat, and the pushing unit drives the fixing seat to move along a length direction of the pressure relief valve body.
3. The pressure relief valve according to claim 2, wherein the driving member includes a piezoelectric stack connected to the fixing base, and the piezoelectric stack can drive the fixing base to move along a length direction of the pressure relief valve body.
4. The pressure relief valve according to claim 2, wherein the driving member includes a rotating base connected to the fixing base, and the rotating base is driven by the adjusting motor to move along a length direction of the pressure relief valve body.
5. The pressure relief valve according to claim 4, wherein an inner thread is provided on an inner wall of the pressure relief valve body, an outer thread matching the inner thread is provided on the rotary base, and the rotary base moves along a length direction of the pressure relief valve body through the outer thread and the inner thread.
6. The pressure relief valve according to claim 2, wherein the sealing ball is disposed on the fixing seat through a pre-tightening spring, and a limiting post for sleeving the spring is disposed on the fixing seat.
7. A method of controlling the pressure relief valve pressure of any of claims 1 to 6, comprising the steps of:
the controller controls the pushing unit to drive the sealing ball to be far away from or tightly press the inlet.
8. The method of controlling pressure relief valve pressure according to claim 7,
by measuring the pressure of the engine oil, the engine speed, and the engine torque, the pressure corresponding to the engine speed and the engine torque is compared with the measured pressure, and then the measured pressure is adjusted to the corresponding pressure by the controller.
CN201910920965.5A 2019-09-27 2019-09-27 Pressure relief valve and method for controlling pressure of pressure relief valve Active CN110425305B (en)

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Application Number Priority Date Filing Date Title
CN201910920965.5A CN110425305B (en) 2019-09-27 2019-09-27 Pressure relief valve and method for controlling pressure of pressure relief valve

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CN110425305B true CN110425305B (en) 2020-05-01

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US11906067B2 (en) * 2022-01-21 2024-02-20 Hamilton Sundstrand Corporation Active valve shimming

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US3747635A (en) * 1972-05-25 1973-07-24 American Air Filter Co Pressure relief control valve
CN201570531U (en) * 2009-12-02 2010-09-01 黄德欢 Pressure release valve for lithium ion batteries
CN202215810U (en) * 2011-07-27 2012-05-09 戴佩裕 Automatic adjusting pressure release valve
CN102979941B (en) * 2012-12-13 2014-06-04 浙江师范大学 High-capacity piezoelectric stack valve provided with sensor
CN205226511U (en) * 2015-12-29 2016-05-11 克拉克过滤器（中国）有限公司 Pressure regulating valve
CN205504106U (en) * 2016-04-16 2016-08-24 浙江工贸职业技术学院 Pressure -limiting valve

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