CN109682554A - A kind of PE ball-valve valve rod tightness test device and its detection method - Google Patents
A kind of PE ball-valve valve rod tightness test device and its detection method Download PDFInfo
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- CN109682554A CN109682554A CN201910032806.1A CN201910032806A CN109682554A CN 109682554 A CN109682554 A CN 109682554A CN 201910032806 A CN201910032806 A CN 201910032806A CN 109682554 A CN109682554 A CN 109682554A
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- upper cover
- valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of PE ball-valve valve rod tightness test devices, it includes pedestal and upper cover, pedestal is equipped with the opening cavity being adapted to stem lower portion to be measured, upper cover has the upper cover cavity accommodated for valve rod top to be measured, the open end of upper cover cavity is equipped with double sealing structure, it is open between the open end and the open end of upper cover cavity of cavity and is contacted by the first sealing ring, the two is tightly connected to form detection cavity, be open cavity open end by the second sealing ring with it is in sealing contact along side in stem lower portion to be measured, the cavity in sealing contact that will test separates in mutually closed inlet chamber and outlet chamber, inlet chamber is connected with air inlet, outlet chamber is connected with pressure sensor, the gap being open between cavity and stem lower portion to be measured constitutes the inlet chamber, gap between upper cover cavity and valve rod top to be measured goes out described in constituting Air cavity, air inlet setting is in opening cavity bottom surface.The present invention have it is small in size, be easily installed and dismantle, the high advantage of detection sensitivity.
Description
Technical field
The invention belongs to valve air-leakage test technical field, especially a kind of PE ball-valve valve rod tightness test device and
Its detection method.
Background technique
Currently, PE ball valve is widely used to the pipe networks such as gas, water supply, and gas ductwork has very strict gas
Close performance requirement.Relevant criterion gives the definition of specification to the interior leakage and leakage of PE ball valve product.Valve rod is the important portion of valve
Part, for being driven, structure includes upper and lower part, and top includes executing agency's mounting portion, rod body part, and lower part includes spool peace
Dress portion connects executing agency or handle thereon, under connect spool, executing agency or handle drives valve rod and mobile with movable valve plug or turn
It is dynamic, to realize the effect of valve switch or adjusting.And the leakage that the valve rod assembly of PE ball valve relates generally to PE ball valve product refers to
Mark.In view of the structure of PE ball valve, ball valve is likely to manifold pressure gas occur under opening state and off state to pass through
The case where valve rod assembly leaks outward.In existing PE ball valve product, cause to be that valve stem seal is not tight the main reason for leakage
And stem material density is inadequate.
Valve rod process for preparing raw material is divided into extruding and injection molding two ways, and the valve rod that extrusion forming obtains processes raw material
Bar generally will appear the case where radial ecto-entad density reduces, i.e. outer layer density is high, and center density is low.Injection molding obtains
Valve rod process raw material bar, heat dissipation shrinkage character is related after density and injection pressure and molding, and the overall strength of materials is not so good as
It is squeezed into moulding mixture.It is processed in consideration of it, the valve rod of PE ball valve more uses extrusion forming raw material.And not because of density of material
Foot, especially eliminates the high surface layer of portion of external density, stem material internal leak leads to asking for PE valve leakage out of steam system after processing
Topic, which has just highlighted, to be come out.In order to ensure valve rod does not leak, is reasonably selected in addition to material and specific density is proposed to raw material lever
And density uniformity requirement is outer, carries out air-tight test to the valve rod that shape processing is completed and is necessary.
In the prior art, the PE valve rod for completing shape processing does not do independent air-tight test detection generally, has
Manufacturing enterprise may be pressurizeed using bar material side AnchorPoint for the raw material lever before processing and see whether immersion in the other side
Observable bubble under environment occurs.There are the deficiencies of several aspects for this method: (1) completing the PE valve valve of shape processing
Bar, because the change of material surface condition is larger, the channel condition of leakage becomes more severe, cannot be with unprocessed raw material lever inspection
Substitute the valve rod completed the process；(2) although being directed to extrusion forming bar material, axis center dot density is lower than edge, tests pressor areas
Still be not limited in valve rod central point, should be theoretically entire pressure-bearing surface be likely to be gas leached surface it is as shown in Figure 1；
(3) it is defined with underwater observation bubble with the presence or absence of leakage, is usually misled into be that certain certain bits has leak source, and is in practice likely to be
One kind of certain area surface leakage is collected；And relative water depth influences the observability overflowed to bubble there are certain uncertain factor,
There is erroneous judgement risk.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of PE ball-valve valve rod tightness test device, the examinations
Experiment device has the advantages that detection sensitivity is high, easy to detect.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of PE ball-valve valve rod tightness test device,
It is characterized by comprising pedestal and upper cover, pedestal and upper cover are tightly connected to form detection cavity, detection cavity and valve rod shape to be measured
At clearance fit, detect the sealed mechanism of cavity and be separated to form mutually closed inlet chamber and outlet chamber, inlet chamber be connected with into
Port, outlet chamber are connected with pressure sensor.
In above structure, valve rod to be measured insertion is formed by detection cavity by pedestal and upper cover, the detection cavity into
Air cavity and outlet chamber seal isolation, the part that stem lower portion is located at inlet chamber is aerating face, and valve rod top is located in upper cover cavity
Part be detection faces, high pressure gas from inlet chamber enter, after the aerating face of valve rod to be measured enters high pressure gas, if high pressure
Gas is oozed out along the detection faces that material internal flows to low pressure, and the gas of exudation can make the air pressure in outlet chamber generate variation,
It detected to be installed in pressure sensor in outlet chamber, because the chamber of the detection cavity entirety is narrow, even if only few
Amount gas exudation may change original air pressure of outlet chamber, therefore the available very high infiltration of the valve rod tightness test device
Gas leakage body Sensitivity and very little resolution value.
Further, the pedestal is equipped with the opening cavity being adapted to stem lower portion to be measured, and upper cover has for be measured
The upper cover cavity that valve rod top accommodates, the open end of upper cover cavity are equipped with double sealing structure, the open end for the cavity that is open with it is upper
Formed by the first sealing ring in sealing contact between the open end of lid cavity, the open end for the cavity that is open passes through the second sealing
Circle and the composition air inlet in gap in sealing contact along side in stem lower portion to be measured, being open between cavity and stem lower portion to be measured
Chamber, the gap between the upper cover cavity and valve rod top to be measured constitute the outlet chamber, and air inlet setting is at opening cavity bottom
Face.
In above structure, the open end of upper cover cavity by double sealing structure formed closed detection cavity and make into
Air cavity and outlet chamber seal against each other isolation, guarantee that the accuracy of gas leakage detection, the opening that the lower part of valve rod to be measured is located at pedestal are held
In chamber, its underpart circumferential surface constitutes aerating face, and the top of valve rod to be measured is located in upper cover cavity, the body of rod circumferential surface on top and driving
The circumferential surface of mechanism mounting portion constitutes detection faces.
Further, the U-shaped structure of the opening cavity, the T-shaped structure of the radial section of stem lower portion to be measured, the T-type
The horizontal part of structure is adapted to the diameter of opening cavity, has groove, groove between T-type structure vertical portion and opening cavity side wall
Place is equipped with supporting block, and supporting block is distributed in the two sides of T-type structure vertical portion in left and right.
In above structure, stem lower portion to be measured is mostly T-type structure, in the opening cavity of T-type structure inserted base, in order to make
Its mounting structure is more stable, and setting supporting block is for clamping T-type structure in opening cavity.
Further, the open end of the opening cavity and stem lower portion to be measured on along Bian Qiping, the upper cover is held
The open end of chamber by inner seal ring be extruded in stem lower portion to be measured on along side, the open end of upper cover cavity has radial
The outer rim of extension is connected between outer rim end face and the open end for the cavity that is open by exterior seal ring.
In above structure, the open end of upper cover cavity has been embedded Double seal ring for sealing, and inner seal ring is extruded in
Play the role of sealing off inlet chamber along side in stem lower portion to be measured and outlet chamber, exterior seal ring are embedded at upper cover cavity
In the outer rim of open end, be extruded on the open end of base openings cavity entirely to detect cavity be sealed chamber,
It is isolated from the outside.
Further, described to be open on the open end of cavity and the horizontal part of valve rod T-type structure to be measured along Bian Qiping, institute
The open end for stating upper cover cavity is extruded on the horizontal part of valve rod T-type structure to be measured by inner seal ring along side, upper cover cavity
Open end there is the outer rim that radially extends, pass through exterior seal ring company between outer rim end face and the open end for the cavity that is open
It connects.
In above structure, the open end of upper cover cavity has been embedded Double seal ring for sealing, and inner seal ring is by upper cover
Pressure is acted on and is extruded on the horizontal part of valve rod T-type structure to be measured along side, plays the role of that inlet chamber and outlet chamber is isolated, outside
Sealing ring then plays the role of the entire detection cavity of sealing.
Further, the supporting block is installed in the opening cavity bottom surface of pedestal, supporting block direction opening by fastener
One end of cavity bottom surface is equipped with open slot, is embedded in elastic component in open slot, and elastic component one end is located in open slot, elastic component it is another
One end is connected to opening cavity bottom surface.
In above structure, support construction plays the role of support and plays stem lower portion to be measured, stablizes its mounting structure, the branch
Bracer is rectangular configuration, is distributed in the two sides of T-type structure, and bottom is fixed on by fastening bolt or fastening screw in the both ends of supporting block
On the opening cavity bottom surface of seat, and elastic component such as spring, elastic slice between supporting block and opening cavity bottom surface etc. structure, then it rises
To adjustment supporting block can support height effect, allow supporting block to be close proximity to the shoulder position of T-type structure, form close-fitting
Supporting role.
Further, the upper cover cavity inner wall is equipped with the positioning tendons being adapted to the circumferential recess on valve rod top to be measured.
In above structure, upper cover cavity inner wall is matched by positioning tendons and the circumferential recess positioning of valve rod top body of rod circumferential surface
It closes and stablizing for valve rod top to be measured is kept to install.
Using the above scheme, the present invention have structural volume is small, is easily installed and dismantles, the high advantage of detection sensitivity.
Another object of the present invention: the invention also discloses a kind of PE ball-valve valve rod air-tight test detection method,
It is characterized in that, includes the following steps: that 1. given threshold defines tightness class or leakage grade；2. completing the airtight of batch valve rod
Property detection；3. being directed to the valve rod of particular batch valve rod Raw material processing, the maximum allowble pressure for providing up-to-standard judgement rises threshold
Value, provides foundation for operational test design of testing device；Step 1. in specifically operate it is as follows: select metal material with structure ruler
Very little valve rod is zero leakage benchmark；Select the valve rod of same material extrusion forming valve rod Raw material processing under specific low-pressure as in leakage
Limit, predicts leak pressure changing value, by zero to the pressure change upper limit, defines tightness class, and/or valve rod leaks grade.
Further, the step 1., and/or step 2. in about air tightness test concrete operations it is as follows: firstly, will
Valve rod to be measured is put into the detection cavity that pedestal and upper cover are formed, and after sealing, forms air inlet and outlet two independent
Airtight cavity condition；After air inlet cavity pressure reaches test air pressure, by the air pressure change amount of pressure sensor detection outlet chamber, and press
Given threshold evaluation tightness class provides the conclusion whether leaked.
Using the above scheme, the present invention can quickly and accurately measure the qualified products of valve rod in same batch.
The invention will be further described below in conjunction with the accompanying drawings.
Detailed description of the invention
Attached drawing 1 is the leakage scenarios introduction of valve rod, and wherein A is axle center single-point aerating leakage scenarios；B is that entire pressure-bearing surface adds
The leakage scenarios schematic diagram of gas；
Attached drawing 2 is the aerating face of present invention valve rod to be measured, detection faces structural schematic diagram；
Attached drawing 3 is specific embodiment of the invention constructional appearance figure；
Attached drawing 4 is specific embodiment of the invention upper cover and pedestal exploded perspective schematic diagram；
Attached drawing 5 looks up structure graph for specific embodiment of the invention upper cover；
Attached drawing 6 is the overlooking state structure chart of specific embodiment of the invention pedestal；
Attached drawing 7 is specific embodiment of the invention structure sectional view；
Attached drawing 8 is the mounting structures schematic diagram of the supporting block cooperation in specific embodiment of the invention valve rod to be measured and pedestal；
Attached drawing 9 is the structural front view of specific embodiment of the invention attached drawing 8；
10 invention specific embodiment part B structure enlarged drawing of attached drawing；
Pedestal 1, opening cavity 11, open end part 111, outer rim 112, upper cover 2, upper cover cavity 21, the first sealing ring 31,
Second sealing ring 32, cylinder 22, pressing plate 23, inlet chamber 41, air inlet 411, outlet chamber 42, gas outlet 421, pressure sensor 5,
Supporting block 6, fastening through-hole 61, fastener 62, open slot 63, elastic component 64, valve rod top 71, circumferential recess 711, stem lower portion
72, horizontal part 721, on along side 721a, vertical portion 722.
Specific embodiment
Specific embodiments of the present invention are PE ball-valve valve rod tightness test device as shown in figs. 2-10 comprising pedestal 1
With upper cover 2, pedestal 1 and upper cover 2 can be connected through a screw thread fixed or be squeezed by external force so that pedestal 1 and upper cover 2
Between closely connection formed sealing detection cavity, detection cavity and valve rod to be measured formed clearance fit, detection cavity it is sealed
Mechanism is separated to form mutually closed inlet chamber 41 and outlet chamber 42, and inlet chamber 41 is connected with air inlet 411, and outlet chamber 42 is equipped with
Gas outlet 421, outlet chamber 42 are connected with pressure sensor 5, and pressure sensor 5 is matured product, can directly purchase, pressure
Force snesor 5 can be built in upper cover 2, can also it is external setting and with 421 connection of outlet chamber 42 or gas outlet, preferably
It is that pressure sensor 5 is built in 2 top platen 23 of upper cover, the upper cover 2 in the present embodiment includes cylinder 22 and pushed up by cylinder 22
The pressing plate 23 of portion's opening insertion, gas outlet 421 are arranged on pressing plate 23, and pressure sensor 5 is built in pressing plate 23 and pressure passes
Sensor 5 is contacted with the gas in outlet chamber 42, when oozing out gas in the detection faces of valve rod to be measured, it will is passed by the pressure on top
Sensor 5 detects, due to the small space of whole detection cavity, even if a small amount of gas exudation, can also be detected.
Specifically, pedestal 1 is equipped with the opening cavity 11 being adapted to stem lower portion 72 to be measured, and upper cover 2 has for be measured
The upper cover cavity 21 that valve rod top 71 accommodates, the open end of upper cover cavity 21 are equipped with double sealing structure, the first sealing ring 31 and the
Two sealing rings 32 are embedded on the open end of upper cover cavity 21 in outer ring, inner ring shape, the open end for the cavity 11 that is open with
Formed by the first sealing ring 31 in sealing contact between the open end of upper cover cavity 21, this is in sealing contact so that pedestal 1 and upper
Closed detection cavity is formed between lid 2, the open end of opening cavity 11 passes through the second sealing ring 32 and stem lower portion to be measured
Along side, 721a is in sealing contact on 72, so that inlet chamber 41 and outlet chamber 42 seal against each other isolation, guarantees the accurate of gas leakage detection
Property, the gap being open between cavity 11 and stem lower portion to be measured 72 constitutes inlet chamber 41,2 inner cavity of upper cover and valve rod top 71 to be measured
Between gap constitute outlet chamber 42, air inlet 411 setting opening 11 bottom surface of cavity, the lower part of valve rod to be measured is located at pedestal 1
Opening cavity 11 in, its underpart circumferential surface constitutes aerating face, and the top of valve rod to be measured is located in upper cover cavity 21, the body of rod on top
The circumferential surface of circumferential surface and driving mechanism mounting portion constitutes detection faces.
As shown in fig. 7, stem lower portion to be measured 72 is T-type structure in the present embodiment, and the horizontal part 721 of the T-type structure is straight
Diameter is greater than 71 diameter of valve rod top, and the outer peripheral surface of the horizontal part 721 of T-type structure is connected to valve rod top 71 weeks in evagination is round table-like
Face.The open end of 1 upper opening cavity 11 of pedestal is flushed on T-type structure horizontal part 721 along side 721a, upper cover cavity 21 with
The part 111 of 71 diametric fit of valve rod top, the open end for the cavity 11 that is open then is extruded on the evagination rotary table along side 721a,
It is contacted between the two by inner seal ring (the second sealing ring 32) so that inlet chamber 41 and outlet chamber 42 are sealed off, in addition,
The open end of upper cover cavity 21 has the outer rim 112 that radially extends, the open end of 112 end face of outer rim and opening cavity 11 it
Between then connected by exterior seal ring (the first sealing ring 31), exterior seal ring makes the detection that sealing is formed between upper cover 2 and pedestal 1
Cavity is isolated from the outside.
The structure of stem lower portion 72 to be measured is mostly T-type structure, and then U-shaped structure makes this to the opening cavity 11 on pedestal 1
Stem lower portion 72 to be measured is whole to be inserted, and the horizontal part 721 of the T-type structure is flushed with the open end of opening cavity 11, T-type
There is recess space between structural vertical portion 722 and opening 11 side wall of cavity, in order to enable the installation knot of stem lower portion to be measured 72
Structure is more stable, supporting block 6 is arranged at the recess space for clamping T-type structure, which is distributed in T junction in left and right
The two sides of structure vertical portion 722.Support construction plays the role of support and plays stem lower portion 72 to be measured, stablizes its mounting structure, this
In embodiment, which is rectangular configuration, and rear and front end is equipped with fastening through-hole 61, is combined with fastening in fastening through-hole 61
Part 62 such as fastening bolt or fastening screw, so that supporting block 6 is fixed on 11 bottom surface of opening cavity of pedestal 1, and 6 court of supporting block
Open slot 63 is then set to one end of opening 11 bottom surface of cavity, open slot 63 is located between two fastening through-holes 61 of front and back end
(position for being not necessarily middle) is embedded in elastic component 64 such as spring, elastic slice structure, 64 one end of elastic component in open slot 63
In open slot 63, the other end of elastic component 64 is connected to opening 11 bottom surface of cavity, which plays adjustment supporting block 6
Can support height effect, allow supporting block 6 to be close proximity to the shoulder position (horizontal part 721) of T-type structure, form close-fitting
Supporting role.
Further, 21 inner wall of upper cover cavity, which is equipped with, makes with the circumferential recess 711(on valve rod top 71 to be measured valve rod is practical
With in the process, which is used to install valve stem packing ring use) the positioning tendons of adaptation.21 inner wall of upper cover cavity passes through
711 location fit of circumferential recess of positioning tendons and 71 body of rod circumferential surface of valve rod top keeps stablizing for valve rod top 71 to be measured to pacify
Dress.
Valve rod tightness test device of the invention is close by the way that valve rod to be measured insertion to be formed by by pedestal 1 and upper cover 2
It is tested in the detection cavity of envelope, the inlet chamber 41 and outlet chamber 42 of the detection cavity are sealed off by double sealing structure,
The part that stem lower portion 72 is located at inlet chamber 41 is aerating face, and valve rod top 71 is located at the part in upper cover cavity 21 for detection
Face, high pressure gas enters from inlet chamber 41, after the aerating face of valve rod to be measured enters high pressure gas, if high pressure gas is along material
The internal detection faces exudation for flowing to low pressure of material, the gas of exudation can make the air pressure in outlet chamber 42 generate variation, thus by pacifying
It detected loaded on pressure sensor 5 in outlet chamber 42, because the chamber of the detection cavity entirety is narrow, even if only a small amount of gas
Exudation may change original air pressure of outlet chamber 42, therefore the available very high leakage gas of the valve rod tightness test device
Body Sensitivity and very little resolution value.
The air-tightness of valve rod is to cause 42 air pressure of outlet chamber to rise by the air pressure that stem material infiltration leaks out with high pressure chest
Method assess.Specific detection method is as follows: 1. given threshold defines tightness class or leakage grade；2. completing to criticize
The air-leakage test of secondary valve rod；3. being directed to the valve rod of particular batch valve rod Raw material processing, the maximum for providing up-to-standard judgement permits
Perhaps pressure ascending threshold provides foundation for operational test design of testing device.
Step 1. in specifically operate it is as follows: selecting metal material with structure size valve rod is zero leakage benchmark；Selection is special
The valve rod of same material extrusion forming valve rod Raw material processing under low-pressure is determined as the leakage upper limit, predicts leak pressure changing value.It presses
Zero, to the pressure change upper limit, defines valve rod and leaks grade.
Step 1. -2. in about air tightness test concrete operations it is as follows: firstly, valve rod to be measured is put into pedestal 1 and upper
In the detection cavity that lid 2 is formed, and after sealing, air inlet and outlet two independent airtight cavity conditions are formed；Inlet chamber
After 41 pressure reach test air pressure, the air pressure change amount of outlet chamber 42 is detected by pressure sensor 5, and evaluate gas by given threshold
Close property grade provides the conclusion whether leaked.
The present invention is not limited to above-mentioned specific embodiment, and persons skilled in the art are disclosed interior according to the present invention
Hold, can be implemented using other a variety of specific embodiments of the invention or all using design structure and think of of the invention
Road does simple change or change, both falls within protection scope of the present invention.
Claims (10)
1. a kind of PE ball-valve valve rod tightness test device, it is characterised in that: including pedestal and upper cover, pedestal and upper cover sealing connect
It connects to form detection cavity, detection cavity and valve rod to be measured form clearance fit, and the detection sealed mechanism of cavity is separated to form mutually
Closed inlet chamber and outlet chamber, inlet chamber are connected with air inlet, and outlet chamber is connected with pressure sensor.
2. PE ball-valve valve rod tightness test device according to claim 1, it is characterised in that: the pedestal be equipped with
The opening cavity of stem lower portion adaptation to be measured, upper cover have the upper cover cavity accommodated for valve rod top to be measured, upper cover cavity
Open end is equipped with double sealing structure, passes through the first sealing ring between the open end for the cavity that is open and the open end of upper cover cavity
Formed it is in sealing contact, the open end of the cavity that is open by the second sealing ring with it is in sealing contact along side in stem lower portion to be measured,
The gap being open between cavity and stem lower portion to be measured constitutes the inlet chamber, between the upper cover cavity and valve rod top to be measured
Gap constitute the outlet chamber, air inlet setting is in opening cavity bottom surface.
3. PE ball-valve valve rod tightness test device according to claim 2, it is characterised in that: the opening cavity is in U
The horizontal part of type structure, the T-shaped structure of the radial section of stem lower portion to be measured, the T-type structure is adapted to the diameter of opening cavity,
There is groove, groove is equipped with supporting block, and supporting block is distributed in T in left and right between T-type structure vertical portion and opening cavity side wall
The two sides in type structural vertical portion.
4. PE ball-valve valve rod tightness test device according to claim 2, it is characterised in that: the opening cavity is opened
Along Bian Qiping in mouthful end face and stem lower portion to be measured, the open end of the upper cover cavity is extruded in be measured by inner seal ring
Along side in stem lower portion, the open end of upper cover cavity has the outer rim radially extended, and outer rim end face is opened with opening cavity
Pass through exterior seal ring between mouth end face to connect.
5. PE ball-valve valve rod tightness test device according to claim 3, it is characterised in that: the opening cavity is opened
Along Bian Qiping on the horizontal part of mouth end face and valve rod T-type structure to be measured, the open end of the upper cover cavity passes through inner seal ring
It is extruded on the horizontal part of valve rod T-type structure to be measured along side, the open end of upper cover cavity has the outer rim radially extended, outer rim
It is connected between end face and the open end for the cavity that is open by exterior seal ring.
6. according to PE ball-valve valve rod tightness test device described in claim 3-5 any one, it is characterised in that: the branch
Bracer is installed in the opening cavity bottom surface of pedestal by fastener, and one end of supporting block towards opening cavity bottom surface is equipped with opening
Slot is embedded in elastic component in open slot, and elastic component one end is located in open slot, and the other end of elastic component is connected to opening cavity bottom
Face.
7. according to PE ball-valve valve rod tightness test device described in claim 2-5 any one, it is characterised in that: on described
Lid cavity inner wall is equipped with the positioning tendons being adapted to the circumferential recess on valve rod top to be measured.
8. PE ball-valve valve rod tightness test device according to claim 6, it is characterised in that: the upper cover cavity inner wall
Equipped with the positioning tendons being adapted to the circumferential recess on valve rod top to be measured.
9. a kind of PE ball-valve valve rod air-tight test detection method, which comprises the steps of: 1. given threshold defines
Tightness class or leakage grade；2. completing the air-leakage test of batch valve rod；3. for particular batch valve rod Raw material processing
Valve rod provides the maximum allowble pressure ascending threshold of up-to-standard judgement, the foundation up-to-standard as judgement valve rod to be measured；Step
Suddenly 1. in specifically operate it is as follows: selecting metal material with structure size valve rod is zero leakage benchmark；It selects under specific low-pressure
The valve rod of same material extrusion forming valve rod Raw material processing predicts leak pressure changing value as the leakage upper limit, becomes by zero to pressure
Change the upper limit, defines tightness class, and/or valve rod leaks grade.
10. PE ball-valve valve rod air-tight test detection method according to claim 9, which is characterized in that the step 1.,
And/or step 2. in about air tightness test concrete operations it is as follows: firstly, valve rod to be measured is put into what pedestal and upper cover were formed
It detects in cavity, and after sealing, forms air inlet and outlet two independent airtight cavity conditions；Air inlet cavity pressure reaches examination
After testing air pressure, by the air pressure change amount of pressure sensor detection outlet chamber, and tightness class is evaluated by given threshold or is provided
The conclusion whether leaked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032806.1A CN109682554A (en) | 2019-01-14 | 2019-01-14 | A kind of PE ball-valve valve rod tightness test device and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032806.1A CN109682554A (en) | 2019-01-14 | 2019-01-14 | A kind of PE ball-valve valve rod tightness test device and its detection method |
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| Publication Number | Publication Date |
|---|---|
| CN109682554A true CN109682554A (en) | 2019-04-26 |
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| CN201910032806.1A Pending CN109682554A (en) | 2019-01-14 | 2019-01-14 | A kind of PE ball-valve valve rod tightness test device and its detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112362260A (en) * | 2020-11-04 | 2021-02-12 | 盐城乔胜机动车配件有限公司 | O type circle defect automatic checkout device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111735579A (en) * | 2020-07-07 | 2020-10-02 | 河南航天液压气动技术有限公司 | Test device for detecting tightness of workpiece |
| CN112362260A (en) * | 2020-11-04 | 2021-02-12 | 盐城乔胜机动车配件有限公司 | O type circle defect automatic checkout device |
| CN112362260B (en) * | 2020-11-04 | 2021-10-29 | 盐城乔胜机动车配件有限公司 | O type circle defect automatic checkout device |
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