CN103225698A - Equal-displacement constant pressure control method and equal-displacement constant pressure valve - Google Patents
Equal-displacement constant pressure control method and equal-displacement constant pressure valve Download PDFInfo
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- CN103225698A CN103225698A CN2013101122478A CN201310112247A CN103225698A CN 103225698 A CN103225698 A CN 103225698A CN 2013101122478 A CN2013101122478 A CN 2013101122478A CN 201310112247 A CN201310112247 A CN 201310112247A CN 103225698 A CN103225698 A CN 103225698A
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Abstract
The invention relates to an equal-displacement constant pressure control method and an equal-displacement constant pressure valve. The valve comprises a valve body, wherein a hollow part of the valve body forms a valve rod channel; a valve rod is movably arranged in the valve rod channel in a penetrating manner; two sealing devices capable of sealing the valve rod channel are arranged on the valve rod; a closed space interval is formed between the two sealing devices and can seal a fluid outlet; two branch inlets are formed in a length direction of the valve rod in the side wall of the valve body, and communicated with an inlet flow channel; and the branch inlets and a fluid inlet are positioned in two sides of the fluid outlet respectively. According to the invention, during a displacement process of the valve rod of the valve, a fluid which is compressed to one side can be supplemented to the other side for releasing the space, so that the total volume of the fluid is not changed in the space of the valve flow channel; the pressure of a closed system is maintained to be constant during a switching process of the valve, and the pressure fluctuation during the switching process of the general valve is eliminated; and the equal-displacement constant pressure control method and the equal-displacement constant pressure valve are suitable for switch control of the closed system in which the volume of the fluid is small.
Description
Technical field
The invention relates to can eliminate the pressure surge phenomenon of valve in switching process wait displacement constant voltage controlling method and etc. displacement constant pressure valve door, belong to oil-gas field development experimental technique field.
Background technique
Valve is in every profession and trade field extensive application, and it is of a great variety.In the oil-gas field development experiment, 3mm needle type valve or spherical valve use in the low discharge experiment flow in a large number, are characterized in that control is simple, high pressure resistant; Spherical valve is withstand voltage less than 15MPa, and needle type valve can be not less than 100MPa.
The void volume of microphysics model is very little, between 0.01 μ L～1mL.In the microphysics simulation, require the micromodel both sides that the turnover of switch valve control fluid is arranged, for obtaining high-quality experiment effect, require the fluid volume in the valve control range the smaller the better.Generally, the fluid volume in this scope can be controlled in the 0.2ml.In the experiment of oil-gas field developments such as conventional core displacement, the fluid volume in the model far surpasses 1ml, and the pressure surge that switching process caused of valve can be ignored fully to the influence of experimentation, but for micromodel, its influence can not be ignored.With ground crude oil is example, and compressibility coefficient is at 4～7*10
-4MPa
-1Between, the descending 1mm of the needle point of 3mm valve apart from the time, can in the airtight fluid of 0.2ml, cause the pressure amplification about 3MPa, for the micromodel of glass material, very easily produce and break.
Avoid the method that this phenomenon takes place to have two kinds at present: the one, valve opening degree very faint (the descending distance of valve needle point is very little when promptly closing); The 2nd, increase airtight fluid volume.Obviously, all there is a lot of shortcomings in two kinds of methods.For example to require fluid must be single-phase to method one, for example aerated fluid by the time will change the volume of gas phase in the foam, this will make simulation process Dazhen of such fluid; And the valve opening degree faint also be to be difficult to control, the too faint flow resistance of needle point ingress that will cause is excessive, easily misleads experimental implementation.If application process two in the displacement process, the situation that driving fluid delays to enter range of observation then appears, if driving fluid and model inner fluid have interaction, then long treating made and observe lagged behind observation time, causes the wrong big of understanding experimental phenomena opportunity.
Because the defective that above-mentioned known technology exists, the inventor is according to the production design experiences of being engaged in related domain and association area for many years, develop displacement constant voltage controlling methods such as utilization of the present invention and eliminate the pressure surge phenomenon of valve in switching process, and etc. displacement constant pressure valve door.
Summary of the invention
Purpose of the present invention provide a kind of pressure surge that can eliminate the valve switch process wait displacement constant voltage controlling method and etc. displacement constant pressure valve door.
For this reason, a kind of displacement constant voltage controlling method that waits, in the displacement of valve rod process of valve, the fluid that is compressed a side can be supplemented to the opposite side Free up Memory, make the fluid total volume constant in the space of valve flowing channel, the pressure of closed system keeps constant in the valve switch process.
The aforesaid displacement constant voltage controlling method that waits, wherein, the branch's inlet that is connected with fluid input is set on valve stem passage, and described branch inlet and described fluid input lay respectively at the both sides of fluid output, make valve rod in movement process, the fluid that is compressed a side can add in the d/d space of opposite side by described branch inlet or fluid input.
The aforesaid displacement constant voltage controlling method that waits, wherein, described valve rod is provided with two seal arrangements, form a closed interval between this two seal arrangement, when mobile described valve rod, when two described seal arrangements move to described fluid output, can seal the both sides of described fluid output, make the closed interval and the outside runner of two described seal arrangements that constitute between described fluid output, the two described seal arrangements constitute two relatively independent pressure spaces, and in the stem movement process, two interior pressure of pressure space remain constant.
The aforesaid displacement constant voltage controlling method that waits, wherein, when two described seal arrangements laid respectively at described fluid output both sides, this two seal arrangement was between described fluid input and branch's inlet.
The aforesaid displacement constant voltage controlling method that waits, wherein, the angular velocity that described valve rod moves is smaller or equal to 90 °/s.
The present invention also proposes a kind of displacement constant pressure valve door that waits, it has a hollow valve body, the hollow portion of described valve body forms valve stem passage, one valve rod can be arranged in the described valve stem passage movably, described valve stem passage is connected with fluid input, fluid output respectively, and described fluid input and fluid output are connected with the valve body outside by entrance channel, outlet flow respectively; Described valve body two ends are by upper press cover, lower cover sealing, and wherein, described valve rod is provided with the seal arrangement of two energy sealed valve stem passages, form a closed interval between the two described seal arrangements, and described fluid output can be sealed in this closed interval; The sidewall of described valve body is provided with two branches inlet along the shaft length direction, and described branch inlet is connected with described entrance channel, and described branch enters the mouth and described fluid input lays respectively at the both sides of described fluid output.
The aforesaid displacement constant pressure valve door that waits, wherein, the distance between the branch of close described fluid input inlet and the described fluid output is more than or equal to the distance between the two described seal arrangements.
The aforesaid displacement constant voltage control valve that waits, wherein, described valve rod is provided with two grooves, all is equipped with seal ring in each described groove, constitutes described seal arrangement.
The aforesaid displacement constant pressure valve door that waits, wherein, the distance between two described grooves is smaller or equal near branch's inlet of described fluid input and the distance between the described fluid output.
The aforesaid displacement constant pressure valve door that waits, wherein, the diameter of described fluid input, fluid output, branch's inlet and entrance channel, outlet flow is approximately 0.5mm-1.0mm.
The aforesaid displacement constant pressure valve door that waits, wherein, the width of described seal arrangement is less than described entrance channel, outlet flow diameter.
Comparing characteristics of the present invention and advantage with known technology is:
Utilize displacement constant voltage controlling method and the constant voltage valve of waiting of the present invention, by the branch's inlet that is connected with fluid input is set, in the movement process of valve rod, make the fluid that is compressed a side can add to the opposite side Free up Memory, thereby make the fluid total volume constant in the confined space of valve, keep the constant pressure in the closed system in the valve switch process, eliminated the pressure surge phenomenon of conventional valve in switching process; Be applicable to the closed system switch control that fluid volume is small.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the displacement constant pressure valve door schematic representation that waits of the present invention;
Fig. 2 is the valve body structure schematic representation that waits displacement constant pressure valve door of the present invention;
Fig. 3 is the stem structure schematic representation that waits displacement constant pressure valve door of the present invention;
Fig. 4 is a valve body confined space view when waiting displacement constant pressure valve door to open of the present invention;
Fig. 5 is a valve body confined space view when waiting displacement constant pressure valve door to close of the present invention;
Fig. 6 is the structural representation that valve is tested;
Fig. 7 is the test result comparison diagram that waits displacement constant pressure valve door and known valve to of the present invention.
The drawing reference numeral explanation:
1, handle 2, hollow plug 3, upper press cover 400, valve
4, valve body 40, valve stem passage 41,42, branch's inlet 43, runner
44, entrance channel 45, fluid input 46, fluid output 48, outlet flow
5,6, seal arrangement 560, closed interval 7, valve rod 70, external screw rod
71,72, groove 8, pad 9, O RunddichtringO 10, plug
11, lower cover 12, external model 13, micromodel 14, pressure transducer
15, pump
Embodiment
A kind of displacement constant voltage controlling method that waits that the present invention proposes, be in the displacement of valve rod process of valve, the fluid that is compressed a side can be supplemented to the opposite side Free up Memory, make the fluid total volume constant in the space of valve flowing channel, it is constant that the pressure of closed system in the valve switch process (closed system herein is meant the micromodel that is connected with described valve, or as microphysics model alleged in the background technique) keeps.
Further, the branch's inlet that is connected with fluid input is set on valve stem passage, and described branch inlet and described fluid input lay respectively at the both sides of fluid output, make valve rod in movement process, the fluid that is compressed a side can add in the d/d space of opposite side by described branch inlet or fluid input.
A feasible technological scheme is, described valve rod is provided with two seal arrangements, form a closed interval between this two seal arrangement, when mobile described valve rod, when two described seal arrangements move to described fluid output, can seal the both sides of described fluid output, make the closed interval and the outside runner of two described seal arrangements that constitute between described fluid output, the two described seal arrangements constitute two relatively independent pressure spaces, and in the stem movement process, two interior pressure of pressure space remain constant.
Wherein, when two described seal arrangements laid respectively at described fluid output both sides, this two seal arrangement was between described fluid input and branch's inlet.
The present invention also proposes a kind of displacement constant pressure valve door that waits, has a hollow valve body, the hollow portion of described valve body forms valve stem passage, one valve rod can be arranged in the described valve stem passage movably, described valve stem passage is connected with fluid input, fluid output respectively, and described fluid input and fluid output are connected with the valve body outside by entrance channel, outlet flow respectively; Described valve body two ends is characterized in that by upper press cover, lower cover sealing described valve rod is provided with the seal arrangement of two energy sealed valve stem passages, form a closed interval between the two described seal arrangements, and described fluid output can be sealed in this closed interval; The sidewall of described valve body is provided with two branches inlet along the shaft length direction, and described branch inlet is connected with described entrance channel, and described branch enters the mouth and described fluid input lays respectively at the both sides of described fluid output.
The present invention has adopted the displacement method that waits in confined space, make valve rod in moving process, can keep the fluid total volume in the valve flowing channel constant, thereby eliminated the pressure surge phenomenon of conventional valve in switching process, promptly, after the Open valve injection pressure makes the micromodel internal pressure reach design pressure in the process of throttle down, do not produce pressure-difference fluctuation in the micromodel, therefore, the present invention is specially adapted to the small closed system switch control of fluid volume.
Understand for technical characteristics of the present invention, purpose and effect being had more clearly, below in conjunction with accompanying drawing and preferred embodiment, to embodiment, structure, feature and the effect that waits displacement constant voltage controlling method and wait displacement constant pressure valve door of the present invention, describe in detail as after.In addition, by the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be goed deep into concrete understanding more to the present invention, however institute's accompanying drawing only provide with reference to and explanation usefulness, be not to be used for the present invention is limited.
As Fig. 1, Fig. 2, shown in Figure 3, a kind of displacement constant pressure valve door that waits that the present invention proposes, has a hollow valve body 4, the hollow portion of described valve body 4 forms valve stem passage 40, one valve rod 7 can be arranged in the valve stem passage 40 movably, valve stem passage 40 is connected with fluid input 45, fluid output 46 respectively, and this fluid input 45 and fluid output 46 are connected with the valve body outside by entrance channel 44, outlet flow 48 respectively.The two ends of valve body 4 are by 11 sealings of upper press cover 3, lower cover, and wherein, valve rod 4 is provided with between seal arrangement 5,6, two seal arrangements 5,6 of two energy sealed valve stem passages 40 and forms a closed interval 560, and this closed interval 560 can sealing fluids outlet 46.The sidewall of valve body 4 is provided with two branches inlet 41,42 along the shaft length direction, and this branch's inlet 41,42 is connected with entrance channel 44, and branch enter the mouth 41,42 and fluid input 45 lay respectively at the both sides of fluid output 46.
Wherein, the distance L 2 between the branch of close fluid input 45 inlet 42 and the fluid output 46 is more than or equal to the distance between two seal arrangements 5,6.
In a specific embodiment, valve rod 7 is provided with two grooves 71,72, all is equipped with seal ring in each described groove 71,72, constitutes described seal arrangement 5,6.
Further, the distance L 1 between two grooves 71,72 is smaller or equal near branch's inlet 42 of fluid input 45 and the distance between the fluid output 46.Thereby guarantee to lay respectively at described fluid output 46 both sides when two seal arrangements 5,6 of valve rod 7, during with fluid output 46 sealings (not being connected) with fluid input 45, seal arrangement 5,6 all is positioned at the bottom with the branch of the most close fluid output 46 inlet 42, and the top of fluid input 45, please cooperate referring to Fig. 1, Fig. 5.
In addition, the diameter of fluid input 45, fluid output 46, branch's inlet 41,42 and entrance channel 44, outlet flow 48 is as far as possible little, approximately can be 0.5mm-1.0mm.
With an instantiation concrete structure that waits displacement constant pressure valve door of the present invention is described in conjunction with Fig. 1 to Fig. 3.As shown in the figure, described valve by valve body 4, valve rod 7, be arranged on seal ring that valve body 4 two ends are used for sealed valve, be arranged on that valve rod 7 is used to open or the seal arrangement 5,6 of throttle down and upper and lower gland 3,11 etc. partly constitute, critical piece and function are as follows:
Have entrance channel 44, outlet flow 48 and valve stem passage 40 in the valve body 4, and the end of entrance channel 44, outlet flow 48 and valve stem passage 40 all there is standard internal thread snapping mouth.Entrance channel 44 is the passages after fluid enters valve, this entrance channel 44 is connected with valve stem passage 40 by fluid input 45, branch inlet 41,42, when unlatching or throttle down, fluid in the valve stem passage 40 can guarantee that the fluid total volume is constant in the confined space of valve body 4 by in branch's inlet 41,42 channelling in entrance channel. Inferior division inlet 42 and 48 distances of outlet flow of entrance channel 44 are L2.Satisfying under the experimental conditions, the diameter of the entrance channel 44 that is connected with valve stem passage 40, branch's inlet 41,42 and outlet flow 48 parts is approximately 0.5mm-1.0mm.By reducing the diameter of fluid input 45, fluid output 46, branch's inlet 41,42 and entrance channel 44, outlet flow 48 as much as possible, make valve rod 7 moving resistances less relatively, be beneficial to control valve, the fluid that reduces in the passage enters in the micromodel, improves the accuracy of micromodel research.Valve stem passage 40 inwalls require smooth, the resistance when moving to reduce valve rod 7.
It is L1 that valve rod 7 is provided with between two grooves, 71,72, two grooves 71,72 distance, in illustrated specific embodiment, and L1=L2.The top of described valve rod 7 is provided with outside thread, forms an external screw rod 70, and valve rod 7 keeps relative moving up and down by the rotation of external screw rod 70 with valve body 4.Valve rod 7 constitutes seal arrangement 5,6 by the seal ring that is embedded in the groove 71,72, sealing device 5,6 keeps closely contacting with valve stem passage 40, and the top and the bottom of fluid in the closed interval 560 that guarantees to form between two seal arrangements 5,6 and valve stem passage 40 isolate.
Two ends at valve body 4 are provided with gland, i.e. upper press cover shown in the figure 3 and lower cover 11, upper and lower gland 3,11 respectively by be arranged on valve body 4 two ends containing spaces 401,402 in pad 8 and cooperating of O RunddichtringO 9 valve rod 7 is implemented sealing.All there is internal thread upper and lower gland 3,11 inside, are used with hollow plug 2 and plug 10 respectively.Hollow plug 2 cooperates with the external screw rod 70 of valve rod 7, and straight line moves can to make valve rod 7 rotate also up and down.Plug 10 has certain distance with valve rod 7 bottoms, thereby in the moving process of valve rod 7, can keep stem bottom not contact with plug 10 all the time.Sealing between above-mentioned upper and lower gland 3,11 that is arranged on valve body 4 two ends and gland and valve body 4, the valve rod 7 and valve rod 7 belong to prior art by structure such as realizing moving up and down cooperating of external screw rod 70 and hollow plug 10, do not repeat them here.
Further describe in conjunction with the accompanying drawings down of the present invention wait displacement constant voltage controlling method, working principle and etc. the working procedure of displacement constant pressure valve door.
By fluid mechanics knowledge as can be known: in the confined space, under the constant condition of fluid volume, the object in the mobile fluid can not cause the change of closed system pressure.
Conventional valve is in opening process, because of proposing the increase that causes confined space that certain volume is arranged on the valve rod, then system's internal pressure decrease to some degree; On the contrary, during valve closing, the descending confined space that causes of valve rod has reducing of certain volume, and system pressure reduces.When airtight volume was big, this pressure surge was very faint, can ignore; But in the very little space of airtight volumes such as micromodel, the pressure surge amplitude that this operation caused is very big, and pressure amplification sees Table 1.
The pressure amplification situation that table 1 valve closing process causes
Pressure amplification degree in the table 1 all is destructive for the microcosmic glass model, and its reason is exactly that the valve needle point has caused when descending the trace of confined space inner fluid to change.
For overcoming the defective that above-mentioned known valve exists, the damaging influence that produces in particularly the microcosmic glass model being tested, this proposition waits displacement constant voltage controlling method, in the displacement of valve rod process of valve, the fluid that is compressed a side can be supplemented to the opposite side Free up Memory, make the fluid total volume constant in the space of valve flowing channel, the pressure of closed system keeps constant in the valve switch process.
A feasible technological scheme is, as shown in Figure 1 and Figure 2, the branch's inlet 41,42 that is connected with fluid input 45 is set on valve stem passage 40, and branch's inlet 41,42 and fluid input 45 lay respectively at the both sides of fluid output 46, make valve rod 7 in movement process, be compressed a side fluid can by branch enter the mouth 41,42 or fluid input 45 add in the d/d space of opposite side.Please cooperate referring to Fig. 4, the fluid-tight space of valve body 4 inside is shown in dash area among Fig. 4, as can be known, under the identical initial conditions of dash area hydrodynamic pressure, valve rod 7 and two seal arrangements 5,6 do not change the volume of dash area in the process of moving up and down, then the hydrodynamic pressure in the valve body confined space of the moving process of valve rod 7 is invariable.
Particularly, valve rod 7 is provided with two seal arrangements 5,6 that are made of two seal rings, form a closed interval 560 between this two seal ring, when mobile valve rod 7, when two seal rings move to fluid output 46, can export 46 both sides by sealing fluid, make the closed interval and the outside runner of two seal rings that constitute between fluid output 46, two seal rings constitute two relatively independent pressure spaces, and in valve rod 7 movement processes, two interior pressure of pressure space remain constant.
And when two seal rings laid respectively at fluid output 46 both sides, this two seal ring was between fluid input 45 and branch's inlet 42.
Please cooperate referring to Fig. 4, Fig. 5, in the confined space of valve body, the constant voltage control procedure when valve rod 7 moves up and down is as follows, explains with valve opening, pass closed procedure:
1. establish valve body 4 original states as shown in Figure 4, fluid (dash area) is in the confined space of valve body 4, know that by situations that is connected such as annular space that forms between entrance channel 44, valve rod 7 and the valve channel 40 and outlet flow 48 fluid in the valve body confined space is in isopiestic state, be made as P
0
2. when valve rod 7 came downwards to state shown in Figure 5, the valve body confined space was separated into two parts (A and B); Descending process is as follows:
The seal arrangement 6 of a, valve rod 7 bottoms comes downwards to fluid output 46 processes, because L1≤L2, is example with L1=L2, and the seal arrangement 5 on valve body 7 tops also comes downwards to inferior division 42 places that enter the mouth; In the descending process, fluid between two seal arrangements 5,6 that are provided with on the valve rod 7 can flow out to the runner 43 that is communicated with entrance channel 44 along bottom branch inlet 42, the fluid of seal arrangement 6 bottoms then flows into entrance channel 44 through fluid input 45, is entered the head room of the seal arrangement 5 on valve body top by branch's inlet 41 on top through entrance channel 44, runner 43 by the fluid of discharging in the valve channel 40.That is, in valve rod 7 descending processes, the fluid of valve channels 40 is discharged in 5,6 extruding of sealed device, in branch's inlet 41 on top is added to the space that valve channel 40 tops increase, therefore, does not have pressure surge in the descending process of valve rod 7, and constant pressure is P
0
In a, b and three steps of c, all kept pressure constant state, thereby the process that valve rod is closed has kept the stable of valve body internal pressure.
3. similar, when valve rod 7 was up, whole system still keep-uped pressure constant.
In the unlatching of above-mentioned valve, close in the closed procedure, by rotation valve rod 7, the external screw rod 70 of valve rod 7 is matched with hollow plug 2, the straight line up and down of realization valve rod 7 moves.Usually the angular velocity with rotation valve rod 7 is controlled at smaller or equal to 90 °/s, thus the pressure surge when reducing switch valve effectively.
Method of the present invention and valve applications in the back-up sand micromodel, and are tested.Valve 400 is installed in the outside of external model 12, and in external model 12, adds the protection of ring pressure.Micromodel 13 void volume are 0.1mL, with the total volume of external model connecting line be 0.3mL.Ring is pressed 5MPa, and initial pressure 1MPa in the micromodel provides pressure and monitoring pressure to change by quizix micro pump 15; Quizix micro pump inner fluid is 9mL.Testing process as shown in Figure 6, dashed area is a fluid passage, valve 400 positions are replaced by displacement constant pressure valve door and the conventional needle type valve of waiting of the present invention respectively.Contrast the variation in pressure that waits displacement constant pressure valve door and conventional needle type valve of the present invention, see Fig. 7.The data of pressure transducer 14 reactions are the pressure in valve left side, and the pressure on valve right side can't directly be measured, and is calculated by fluid compressibility.Above-mentioned test structure shown in Figure 6 is a routine techniques, does not repeat them here.
Test result shows that the pressure surge that conventional needle type valve causes is very big, causes the damage of glass model easily; And the displacement constant pressure valve that waits of the present invention is being opened and is being closed in the closed procedure, and pressure is constant substantially.
The above only is the schematic embodiment of the present invention, is not in order to limit scope of the present invention.Any those skilled in the art, equivalent variations and the modification done under the prerequisite that does not break away from design of the present invention and principle all should belong to the scope of protection of the invention.And need to prove, each constituent element of the present invention is not limited in above-mentioned overall applicability, each technical characteristics of describing in the specification of the present invention can select one to adopt or select the multinomial use that combines separately according to actual needs, therefore, other combination relevant with this case inventive point and concrete the application have been contained in the present invention in the nature of things.
Claims (11)
1. one kind is waited displacement constant voltage controlling method, in the displacement of valve rod process of valve, the fluid that is compressed a side can be supplemented to the opposite side Free up Memory, makes the fluid total volume constant in the space of valve flowing channel, and the pressure of closed system keeps constant in the valve switch process.
2. the displacement constant voltage controlling method that waits as claimed in claim 1, it is characterized in that, the branch's inlet that is connected with fluid input is set on valve stem passage, and described branch inlet and described fluid input lay respectively at the both sides of fluid output, make valve rod in movement process, the fluid that is compressed a side can add in the d/d space of opposite side by described branch inlet or fluid input.
3. the displacement constant voltage controlling method that waits as claimed in claim 1, it is characterized in that, described valve rod is provided with two seal arrangements, form a closed interval between this two seal arrangement, when mobile described valve rod, when two described seal arrangements move to described fluid output, can seal the both sides of described fluid output, make the closed interval and the outside runner of two described seal arrangements that constitute between described fluid output, the two described seal arrangements constitute two relatively independent pressure spaces, and in the stem movement process, two interior pressure of pressure space remain constant.
4. the displacement constant voltage controlling method that waits as claimed in claim 3 is characterized in that, when two described seal arrangements laid respectively at described fluid output both sides, this two seal arrangement was between described fluid input and branch's inlet.
5. as each described displacement constant voltage controlling method that waits of claim 1 to 4, it is characterized in that the angular velocity that described valve rod moves is smaller or equal to 90 °/s.
6. one kind is waited displacement constant pressure valve door, has a hollow valve body, the hollow portion of described valve body forms valve stem passage, one valve rod can be arranged in the described valve stem passage movably, described valve stem passage is connected with fluid input, fluid output respectively, and described fluid input and fluid output are connected with the valve body outside by entrance channel, outlet flow respectively; Described valve body two ends is characterized in that by upper press cover, lower cover sealing described valve rod is provided with the seal arrangement of two energy sealed valve stem passages, form a closed interval between the two described seal arrangements, and described fluid output can be sealed in this closed interval; The sidewall of described valve body is provided with two branches inlet along the shaft length direction, and described branch inlet is connected with described entrance channel, and described branch enters the mouth and described fluid input lays respectively at the both sides of described fluid output.
7. the displacement constant pressure valve door that waits as claimed in claim 6 is characterized in that, branch's inlet of close described fluid input and the distance between the described fluid output are more than or equal to the distance between the two described seal arrangements.
8. the displacement constant pressure valve door that waits as claimed in claim 6 is characterized in that described valve rod is provided with two grooves, all is equipped with seal ring in each described groove, constitutes described seal arrangement.
9. the displacement constant pressure valve door that waits as claimed in claim 8 is characterized in that, the distance between two described grooves is smaller or equal near branch's inlet of described fluid input and the distance between the described fluid output.
10. the displacement constant pressure valve door that waits as claimed in claim 6 is characterized in that the diameter of described fluid input, fluid output, branch's inlet and entrance channel, outlet flow is approximately 0.5mm-1.0mm.
11. the displacement constant pressure valve door that waits as claimed in claim 6 is characterized in that the width of described seal arrangement is less than described entrance channel, outlet flow diameter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110501256A (en) * | 2019-09-09 | 2019-11-26 | 中国矿业大学(北京) | A kind of gas level pressure test device for desorption and method |
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| CN103225698B (en) | 2015-07-08 |
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