CN111350849A - Swing type micro-resistance low-pressure-difference check valve - Google Patents

Swing type micro-resistance low-pressure-difference check valve Download PDF

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Publication number
CN111350849A
CN111350849A CN202010300596.2A CN202010300596A CN111350849A CN 111350849 A CN111350849 A CN 111350849A CN 202010300596 A CN202010300596 A CN 202010300596A CN 111350849 A CN111350849 A CN 111350849A
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CN
China
Prior art keywords
hole
valve
valve clack
check valve
clack
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Pending
Application number
CN202010300596.2A
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Chinese (zh)
Inventor
何春焕
冯玉柱
冯冰
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Yuanda Vavle Group Co ltd
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Yuanda Vavle Group Co ltd
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Priority to CN202010300596.2A priority Critical patent/CN111350849A/en
Publication of CN111350849A publication Critical patent/CN111350849A/en
Pending legal-status Critical Current

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    • 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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings

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

Abstract

The invention relates to a swing type micro-resistance low-pressure-difference check valve, wherein a large valve clack is provided with at least one through hole, and a low-pressure-difference check valve mechanism is arranged in the through hole. The low-pressure-difference check valve mechanism comprises a support frame, a guide rod, a small valve clack, a guide frame and a spring, wherein the support frame is fixed on the inner wall of the through hole, and the center of the support frame is provided with a through hole; one end of the guide rod can be slidably connected in the through hole in a penetrating way; the middle part of the guide rod is fixed with the small valve clack, and the sealing surface of the small valve clack is tightly attached to the back side surface of the large valve clack; the guide frame is arranged on the back side surface of the small valve clack, and the other end of the guide rod is connected in the sleeving hole of the guide frame in a penetrating mode. And two ends of the spring are respectively and fixedly connected with the sealing surfaces of the support frame and the small valve clack. The invention arranges a low pressure difference check valve mechanism on the big valve flap of the prior swing check valve, when the pressure difference is smaller, the small valve flap of the low pressure difference check valve mechanism is firstly opened, and when the pressure difference rises, the big valve flap is opened again. The invention has the characteristics of low opening pressure difference, reliable opening of low pressure difference, small opening pressure loss and the like.

Description

Swing type micro-resistance low-pressure-difference check valve
Technical Field
The invention relates to a check valve, in particular to a swing-type micro-resistance low-pressure-difference check valve.
Background
The swing check valve is also called a check valve, and is an automatic valve for preventing medium from flowing backwards on a one-way flow pipeline, and the valve is automatically opened or closed by the pressure of medium flowing in the pipeline, and can be divided into a single-flap type, a double-flap type and a multi-flap type, and belongs to one of the commonly used valves. The swing check valve is generally suitable for pipelines with clean fluid media and is not suitable for working conditions with high viscosity or solid particles, otherwise, the check valve is not sensitive to opening, cannot achieve complete sealing, and is not reliable enough for stopping the fluid. The swing check valve only allows the medium to flow in one direction, and can effectively prevent the medium from flowing backwards so as to prevent accidents. As shown in fig. 1, the basic structure of a swing check valve 1 includes a valve cover 11, a rocker 12, a valve flap 14, and a sealing rubber ring 13. The clack 14 and the rocker 12 of the swing check valve 1 are connected together and can rotate around a pin shaft for a certain angle. When the pipeline fluid flows in the designated direction (from left to right), the inlet pressure of the valve clack is higher than the outlet pressure, and the valve clack 14 is pushed away from the valve seat and rotates around the pin shaft to a certain position, so that the valve is in an opening state. When the pressure difference across the valve flap 14 decreases to a certain level, the valve flap 13 falls down and returns to the closed state. When fluid flows from right to left, namely flows backwards reversely, the pressure of the right side of the valve clack 13 is higher than that of the left side, the valve clack 13 is pressed on a valve seat (a sealing rubber ring 13 is arranged on the valve seat) by the acting force generated by the pressure difference of the two sides, and the medium cannot flow backwards if the fluid cannot pass through the valve seat; and the larger the fluid pressure is, the tighter the sealing surface is pressed, and the better the sealing effect is. The position of the swing check valve is not limited, and it can be installed horizontally in the pipeline, or it can be installed on the vertical or inclined pipeline, but if it is installed on the vertical pipeline, the flow direction of the medium should be from bottom to top.
However, the medium of the conventional swing check valve needs to push the valve flap to rotate and lift the check valve, the opening pressure difference is usually high, and on low-pressure-difference medium pipelines such as a gas pipeline and the petrochemical industry, the medium pressure is difficult to overcome the gravity of the valve flap, and the pressure loss is large.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a swing type micro-resistance low-pressure-difference check valve, and particularly, the swing type micro-resistance low-pressure-difference check valve has the characteristics of low opening pressure difference, reliability in opening and small opening pressure loss by improving the existing check valve.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a swing-type micro-resistance low-pressure-difference check valve comprises a valve body, a rotating arm, a large valve clack and a large valve clack valve seat; the large valve clack comprises a sealing surface and a back side surface, the sealing surface faces towards the valve seat of the large valve clack, and the back side surface is opposite to the sealing surface;
the large valve clack is provided with at least one through hole, and the through hole is provided with a low-pressure-difference check valve mechanism; the low pressure difference check valve mechanism comprises a support frame, a guide rod, a small valve clack, a guide frame and a spring, wherein:
the support frame is fixed on the inner wall of the through hole, and a through hole is formed in the center of the support frame;
one end of the guide rod can be slidably penetrated in the penetrating hole;
the middle part of the guide rod is fixed with the small valve clack, the area of the small valve clack is larger than the section of the through hole, the small valve clack is provided with a sealing surface and a back side surface, the sealing surface of the small valve clack is tightly attached to the back side surface of the large valve clack, and the back side surface of the small valve clack is the surface opposite to the sealing surface of the small valve clack;
the guide frame is arranged on the back side surface of the small valve clack, a sleeving hole is formed in the center of the guide frame, and the other end of the guide rod penetrates through the sleeving hole;
and two ends of the spring are respectively and fixedly connected with the support frame and the sealing surface of the small valve clack.
According to the preferred embodiment of the present invention, the number of the through holes is more than 2, including 2.
According to the preferred embodiment of the invention, the number of the through holes is 2, the through holes are arranged on a horizontal plane where the central line of the large valve clack is located, and the two through holes are axisymmetric relative to the central line.
In addition, when the number of the through holes is more than 4 and is even, the through holes are arranged on the horizontal plane where the center line of the large valve clack is located, and the through holes on one side of the center line and the through holes on the other side of the center line are axisymmetric relative to the center line.
According to the preferred embodiment of the invention, the supporting frame is of an umbrella framework structure and comprises a plurality of connecting rods, one end of each connecting rod is fixed on the inner wall of the through hole, and the other end of each connecting rod is gathered towards the middle and connected to the periphery of the through hole; or the support frame is of a bowl-shaped structure, the edge of an opening of the bowl-shaped structure is fixed on the inner wall of the through hole, the through hole is formed in the bottom of a bowl of the bowl-shaped structure, and a through hole is formed in the wall of the bowl-shaped structure.
According to the preferred embodiment of the invention, the support frame is fixed on the inner wall of the through hole and close to one end of the back side surface of the large valve clack.
According to a preferred embodiment of the present invention, the spring is a cylindrical spring, and the spring is sleeved on the guide rod.
According to the preferred embodiment of the invention, the guide frame is a cylindrical tube with one open end and the other closed end, the center of the end face of the closed end is provided with the sleeving hole, and one end of the open end is in press connection with the back side face of the small valve clack.
According to the preferred embodiment of the present invention, the sleeve hole of the guide frame is fixedly connected to the guide bar.
According to the preferred embodiment of the invention, a pipeline is arranged in the large valve clack valve seat, and a sealing ring is arranged on one surface, facing the large valve clack, of the large valve clack valve seat. Preferably, a sealing rubber ring is arranged on the end face, facing the small valve clack, of the through hole of the large valve clack, so that the sealing performance of the small valve clack on the through hole is improved.
According to the preferred embodiment of the invention, the big valve flap and the small valve flap are made of polytetrafluoroethylene.
(III) advantageous effects
The invention has the beneficial effects that:
the swing type micro-resistance low differential pressure check valve is characterized in that a low differential pressure check valve mechanism is arranged on a large valve flap of the existing swing type check valve, when the pressure difference is smaller, a small valve flap of the low differential pressure check valve mechanism is opened firstly, and when the pressure difference rises and can overcome the resistance of the opening of the large valve flap, the large valve flap is opened again. The swing-type micro-resistance low-pressure-difference check valve has the characteristics of low opening pressure difference, reliable low-pressure-difference opening, small opening pressure loss and the like.
Through setting up low pressure difference check valve mechanism, the low pressure medium also can promote the little valve clack of low pressure difference check valve mechanism and open for opening the pressure differential and become little, loss of pressure reduces, also is applicable to trades such as long transmission line and city gas transmission and distribution pipe network of natural gas, artifical coal gas, liquefied gas more.
Preferably, the large valve flap and the small valve flap are made of polytetrafluoroethylene, and the polytetrafluoroethylene is utilized to generate micro deformation under the action of medium pressure, so that the sealing performance is improved, the impact of the medium pressure is relieved, the generation of sparks (the polytetrafluoroethylene can reduce static electricity) caused by static electricity generated by the impact of the medium is prevented, the whole pipeline system is protected, the suitable gas pipeline is used for controlling the opening and closing of the pipeline medium to be connected and cut off, and the medium backflow is prevented.
The guide frame is in compression joint with the back side face of the small valve clack, so that the small valve clack can be supported, and the small valve clack is prevented from bending and deforming under pressure to cause poor sealing performance.
The swing-open type micro-resistance low-pressure-difference check valve adopts the structural form and the working principle of an axial flow type check valve, has simple structure, and has the characteristic of no more than that of other check valves no matter from the aspects of flow resistance or service performance. The axial flow type check valve adopts a special sealing structure, and the valve is tightly closed no matter the pressure behind the valve is high or low, and the sealing performance is good, so that the defect of poor sealing performance when the common check valve is under low back pressure is overcome; the novel axial flow shuttle type flow meter has a unique axial flow shuttle type structure and has the advantages of small flow resistance, large flow coefficient, small overall dimension and the like.
Drawings
Fig. 1 is a schematic structural view of a conventional swing check valve.
Fig. 2 is a schematic view of the overall structure of the swing-type micro-resistance low-pressure-difference check valve according to the embodiment of the invention.
Fig. 3 is a partial structural schematic view of the swing-type micro-resistance low differential pressure check valve according to the embodiment of the invention when closed.
Fig. 4 is a partial structural schematic view of the swing-type micro-resistance low differential pressure check valve according to the embodiment of the invention when the check valve is opened.
Fig. 5 is a first structural schematic diagram of the support frame according to the embodiment of the invention.
Fig. 6 is a second structural schematic view of the supporting frame according to the embodiment of the invention.
[ description of reference ]
The prior art is as follows:
1 swing check valve; 11 a valve cover; 12 a rocker; 13 sealing the rubber ring; 14 valve clack;
the invention comprises the following steps:
2 a swing type micro resistance low differential pressure check valve; 20 a valve body; 21 a valve cover; 22 large valve clack; 221 a sealing surface; 222 a back side; 23 large valve clack valve seats; 231 a sealing ring; a P pipeline; 24 rotating arms; 25 rotating arm pin shafts; 220 through holes; 30 low differential pressure check valve mechanism; 31a support frame; 31A connecting rod; 31B through the hole; 32 a guide bar; 33 small valve clack; 33A sealing surface; 33B a back side; 34 a guide frame; 35 spring.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof, which are illustrated in the accompanying drawings of FIGS. 2-4.
Fig. 2 is a schematic diagram of the overall structure of a swing-type micro-resistance low differential pressure check valve 2 according to an embodiment of the present invention, which includes a valve body 20, a rotating arm 24, a large flap 22, a large flap valve seat 23, and a valve cover 21. The rotating arm 24 is connected to a rotating arm pin 25, the rotating arm 24 can rotate by taking the rotating arm pin 25 as an axis, the rotating arm 24 is connected with the large valve clack 22, and the large valve clack 22 is driven to open or close by the rotation of the rotating arm 24. Wherein, the middle of the valve seat 23 of the large valve clack is provided with a pipeline P, one side of the valve seat 23 of the large valve clack facing the large valve clack 22 is provided with a sealing ring 231, and the sealing ring 231 is embedded at the periphery of the pipeline P. The bonnet 21 is bolted to the valve body 20 so that the bonnet 21 is opened to service the interior of the valve body 20. The left side of the valve body 20 is connected with an upstream medium pipe, and the right side of the valve body 20 is connected with a downstream medium pipe. The large flap 22 includes a sealing surface 221 and a back side 222, the sealing surface 221 being the side of the large flap 22 facing the large flap valve seat 23, and the back side 222 being the side opposite the sealing surface 221.
As shown in fig. 2-3, the large flap 22 is provided with at least one through hole 220. In the preferred embodiment, the number of through holes 220 is 2 and is arranged symmetrically to the center line of the large flap 22. The two through-holes 220 are arranged in the horizontal plane of the centre line of the large flap 22, as oriented in fig. 2, and are axisymmetrical with respect to this centre line. When the number of the through holes 220 is an even number of more than 4, the through holes are also arranged on the horizontal plane where the center line of the large valve flap 22 is located, and the through holes on one side of the center line and the through holes on the other side of the center line are axisymmetric relative to the center line.
When the valve body 20 of the swing-type micro-resistance low-pressure-difference check valve 2 is horizontally installed, the through holes 220 are arranged on the horizontal plane where the center line of the large valve clack 22 is located and are axially symmetrical relative to the center line, so that the pressure applied to each through hole 220 is balanced; when the valve body 20 is vertically installed, the through holes 220 only need to be symmetrically and uniformly distributed relative to the central axis of the large valve flap 22, and the pressure applied to each through hole 220 can be balanced.
Wherein a low pressure difference check valve mechanism 30 is mounted on each through hole 220. As shown in fig. 3, the low differential pressure check valve mechanism 30 further includes a support frame 31, a guide rod 32, a small flap 33, a guide bracket 34, and a spring 35. The following description is made with respect to the features and functions of the respective constituent elements of the low differential pressure check valve mechanism 30, respectively:
the supporting frame 31 is fixed on the inner wall of the through hole 220, and a through hole for passing through the guide rod 32 is formed in the center thereof. Specifically, the support frame 31 is fixed to an inner wall of the through hole 220 near one end of the back side 222 of the large flap 22. The support frame 31 requires a stable, symmetrical support structure and also does not impede media flow. Therefore, the structure of the supporting frame 31 may be set as follows: as shown in fig. 5, the first form is: the supporting frame 31 is an umbrella framework structure and comprises a plurality of connecting rods 31A, one end of each connecting rod 31A is fixed on the inner wall of the through hole 220, and the other end of each connecting rod 31A is gathered towards the middle and connected to the periphery of the through hole 31B. The gap between the connecting rod 31A and the connecting rod 31A allows the medium to flow through. As shown in fig. 6, another form is: the supporting frame 31 is a bowl-shaped structure, the opening edge of the bowl-shaped structure is fixed on the inner wall of the through hole 220, the bottom of the bowl-shaped structure is provided with a through hole, the wall of the bowl-shaped structure is provided with through holes, and the through holes can be used for medium circulation. The support frame 31 is not limited to the above configuration, as long as the purpose of stable support and medium circulation is satisfied.
One end of the guide rod 32 is slidably inserted into the insertion hole 31B, and preferably, a stopper member is provided at the end of the guide rod 32 to prevent the guide rod 32 from being removed from the insertion hole 31B.
The small valve flap 33 is fixedly installed at the middle position of the guide bar 32, and the area of the small valve flap 33 should be larger than the hole section of the through hole 220 so as to seal the through hole 220. The small flap 33 is also provided with a sealing surface 33A and a back side 33B. The sealing surface 33A of the small flap 33 abuts against the back side 222 of the large flap 22, and the back side 33B is the opposite side of the sealing surface 33A. Preferably, the large flap 22 and the small flap 33 are both made of polytetrafluoroethylene.
A spring 35 is arranged between the small valve flap 33 and the support frame 31, the spring 35 is preferably a cylindrical spring, and is sleeved outside the guide rod 32, and one end of the spring 35 is fixedly connected with the support frame 31, and the other end of the spring is fixedly connected with the sealing surface 33A of the small valve flap 33.
The guide frame 34 is arranged on the back side 33B of the small valve flap 33, and a sleeve hole is arranged in the center of the guide frame 34, so that the other end of the guide rod 32 is penetrated in the sleeve hole. Preferably, the receiving hole of the guide frame 34 is fixedly connected to the guide bar 32, and the guide frame 34 includes a sidewall, which is pressed against the back side 33B of the small valve flap 33 to prevent the small valve flap 33 from bending and deforming in the direction of the back side 33B.
Preferably, the guiding frame 34 is a cylinder with one end open and the other end closed, the center of the end face of the closed end is provided with a socket hole, and the open end is pressed on the back side 33B of the small valve flap 33. Or the first guide frame 34 is a bowl-shaped structure, one end of the bowl bottom is provided with a sleeve hole, and one end of the bowl opening is pressed on the back side surface 33B of the small valve clack 33. Or, the guiding frame 34 is a plurality of L-shaped claw members, one end of each L-shaped claw member is gathered and connected around the sleeving hole, and the other end of each L-shaped claw member is pressed on the back side surface 33B of the small valve flap 33.
Wherein, the side of the through hole 220 of the large valve flap 22 facing the sealing surface 33A of the small valve flap 33 is provided with a sealing rubber ring to increase the sealing performance of the small valve flap 33 to the through hole 220.
Referring to fig. 4, the large valve flap 22 is provided with the low pressure difference check valve mechanism 30, when the pressure difference is small, the small valve flap 33 of the low pressure difference check valve mechanism 30 is opened first, and when the pressure difference rises to overcome the resistance of the large valve flap 22, the large valve flap 22 is opened again. The swing-type micro-resistance low-pressure-difference check valve 2 has the characteristics of low opening pressure difference, reliable low-pressure-difference opening, small opening pressure loss and the like.
Now, when the number of the low-pressure-difference check valve mechanisms 30 is 2, the opening pressure of the swing-open type micro-resistance low-pressure-difference check valve 2 is analyzed:
firstly, the opening pressure of the valve is analyzed, the opening pressure of the conventional swing check valve is P, and the opening pressure of the swing check valve is P by improving the structural form of the valve clack0Two check valves with low pressure difference are added, and the opening pressure of each check valve is P1，P2And analyzing to obtain a required opening pressure relation formula as follows:
P＞P0(1)
P0＞P1+P2(2)
the actual opening pressure P can be derived from the equations (1) and (2)Is openedIs composed of
PIs opened＝P-P0 (3)
The resulting opening pressure Popen is thus reduced by P from the original opening pressure P1+P2
The force on the flap is calculated as follows:
and calculating the acting force on the valve clack of the check valve according to the moment balance principle.
FL＝GL0(4)
In which F-force on the flap, N
F ═ SP (neglecting other moments)
S-valve flap area, mm2
P-pressure in valve cavity, MPa
P＝mgL0/SL (5)
Through the relation, the pressure of the system can be reduced in different working conditions by changing the opening pressure of the valve, so that the energy consumption is reduced, the cost is reduced, and the economic benefit is improved.
Furthermore, the swing-type micro-resistance low-pressure-difference check valve 2 adopts a swing-type structure with an internal rocker arm, all opening and closing parts such as a large valve clack, a small valve clack and the like are arranged in the valve body and do not penetrate through the valve body, and the whole body has no external leakage point except for a sealing gasket and a sealing ring used for a flange part on the left side surface of a valve seat 23 of the large valve clack, so that the possibility of valve leakage is eliminated. All parts and arrangement structures of the swing type micro-resistance low-pressure-difference check valve 2 are manufactured according to GB/T12236-2007, GB/T12224-2015 and related valve standard requirements, and have the advantages of fire prevention, static prevention, safe and reliable performance, high corrosion resistance and the like; the device can be specially used for controlling and controlling the flow of natural gas, coal gas, liquefied gas and other fuel gas and non-corrosive gas pipelines. Furthermore, the swing-type micro-resistance low-pressure-difference check valve 2 designed by the invention is suitable for medium fluid with nominal pressure of 0.25-16MPa, nominal diameter DN200-1000mm and suitable temperature of-29-425 ℃, the connection mode of the swing-type micro-resistance low-pressure-difference check valve with an upper pipeline and a lower pipeline is flange connection or welding, and the suitable medium is natural gas or liquid requiring low-pressure-difference flow and the like.
The swing-open type micro-resistance low-pressure-difference check valve 2 has excellent overflowing performance and sensitive opening reaction, and is suitable for check parts of fluid pipeline systems. Through changing the structure of current valve clack, optimize ordinary check valve, make it obtain fine application in special operating mode, in the production practice, when requiring the check valve to be low pressure difference because the operating mode, the passive situation that the check valve selection is difficult appears, for gas, petrochemical industry energy reduction increase performance, more effectual realization is energy-conserving.

Claims (10)

1. A swing-type micro-resistance low-pressure-difference check valve comprises a valve body, a rotating arm, a large valve clack and a large valve clack valve seat; the large valve clack comprises a sealing surface and a back side surface, the sealing surface faces towards the valve seat of the large valve clack, and the back side surface is opposite to the sealing surface;
the method is characterized in that: the large valve clack is provided with at least one through hole, and the through hole is provided with a low-pressure-difference check valve mechanism; the low pressure difference check valve mechanism comprises a support frame, a guide rod, a small valve clack, a guide frame and a spring, wherein:
the support frame is fixed on the inner wall of the through hole, and a through hole is formed in the center of the support frame;
one end of the guide rod can be slidably penetrated in the penetrating hole;
the middle part of the guide rod is fixed with the small valve clack, the area of the small valve clack is larger than the section of the through hole, the small valve clack is provided with a sealing surface and a back side surface, the sealing surface of the small valve clack is tightly attached to the back side surface of the large valve clack, and the back side surface of the small valve clack is the surface opposite to the sealing surface of the small valve clack;
the guide frame is arranged on the back side surface of the small valve clack, a sleeving hole is formed in the center of the guide frame, and the other end of the guide rod penetrates through the sleeving hole;
and two ends of the spring are respectively and fixedly connected with the support frame and the sealing surface of the small valve clack.
2. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the number of the through holes is more than 2.
3. The swing micro-resistive low differential pressure check valve of claim 2, wherein: the number of the through holes is 2, the through holes are arranged on a horizontal plane where the center line of the large valve clack is located, and the two through holes are axisymmetric relative to the center line.
4. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the supporting frame is of an umbrella framework structure and comprises a plurality of connecting rods, one end of each connecting rod is fixed on the inner wall of the through hole, and the other end of each connecting rod is gathered towards the middle and connected to the periphery of the through hole; or the support frame is of a bowl-shaped structure, the edge of an opening of the bowl-shaped structure is fixed on the inner wall of the through hole, the through hole is formed in the bottom of a bowl of the bowl-shaped structure, and a through hole is formed in the wall of the bowl-shaped structure.
5. The swing micro-resistive low differential pressure check valve of claim 4, wherein: the support frame is fixed the inner wall of through-hole and be close to the one end of the dorsal surface of big valve clack.
6. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the spring is a cylindrical spring, and the spring is sleeved on the guide rod.
7. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the guide frame is a cylindrical tube with one open end and the other closed end, the center of the end face of the closed end is provided with the sleeving hole, and one open end is in crimping connection with the back side face of the small valve clack.
8. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the sleeve hole of the guide frame is fixedly connected with the guide rod.
9. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the valve seat of the large valve clack is internally provided with a pipeline, and one surface of the valve seat of the large valve clack, which faces the large valve clack, is provided with a sealing ring.
10. The swing micro-resistive low differential pressure check valve of claim 1, wherein: the big valve clack and the small valve clack are made of polytetrafluoroethylene.
CN202010300596.2A 2020-04-16 2020-04-16 Swing type micro-resistance low-pressure-difference check valve Pending CN111350849A (en)

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CN202010300596.2A CN111350849A (en) 2020-04-16 2020-04-16 Swing type micro-resistance low-pressure-difference check valve

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Application Number Priority Date Filing Date Title
CN202010300596.2A CN111350849A (en) 2020-04-16 2020-04-16 Swing type micro-resistance low-pressure-difference check valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023249978A1 (en) * 2022-06-21 2023-12-28 Applied Materials, Inc. Self-adjustable variable orifice check valve for back pressure reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023249978A1 (en) * 2022-06-21 2023-12-28 Applied Materials, Inc. Self-adjustable variable orifice check valve for back pressure reduction

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