CN110375095B - Pneumatic overload stop valve - Google Patents

Pneumatic overload stop valve Download PDF

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Publication number
CN110375095B
CN110375095B CN201910753583.8A CN201910753583A CN110375095B CN 110375095 B CN110375095 B CN 110375095B CN 201910753583 A CN201910753583 A CN 201910753583A CN 110375095 B CN110375095 B CN 110375095B
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China
Prior art keywords
pressure regulating
air
piston
pressure
valve
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Active
Application number
CN201910753583.8A
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Chinese (zh)
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CN110375095A (en
Inventor
张朴
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Wuhan Fulong Automatic Control Valve Co ltd
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Wuhan Fulong Automatic Control Valve Co ltd
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Priority to CN201910753583.8A priority Critical patent/CN110375095B/en
Publication of CN110375095A publication Critical patent/CN110375095A/en
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Classifications

    • 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
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0406—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of balls
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters

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

Abstract

The invention discloses a pneumatic overload stop valve, which comprises a valve body and a cover plate; the cover plate is connected with the upper end of the valve body through bolts; the two opposite sides of the valve body are respectively provided with an air inlet and an air outlet, the upper part of the air inlet is provided with a pressure regulating air chamber, an air inlet one-way valve and an air outlet one-way valve are arranged in the pressure regulating air chamber, two channels for the air inlet to be communicated with the air inlet one-way valve and the air outlet one-way valve are arranged on the air inlet, the upper part of the air outlet is provided with a control air chamber, the air inlet one-way valve and the air outlet one-way valve are respectively communicated with the control air chamber, a piston assembly for blocking the air outlet when the air pressure is overlarge is arranged in the control air chamber, and a piston exhaust hole communicated with the control air chamber and used for piston movement exhaust is arranged in the middle of the valve body; the upper part of the pressure regulating air chamber is communicated with the upper part of the control air chamber. The device can effectively cope with the conditions of load increase, air pressure increase or excessive air source pressure and the like, can automatically cut off the air source, and ensures the safety of other equipment on a pipeline and the safety of operators.

Description

Pneumatic overload stop valve
Technical Field
The invention belongs to the field of stop valves, and particularly relates to a pneumatic overload stop valve.
Background
The shut-off valve is also called a shut-off valve, and belongs to a forced sealing type valve, so that when the valve is closed, pressure must be applied to the valve clack so as to force the sealing surface not to leak. When a medium enters the valve from the lower part of the valve clack, the resistance which needs to be overcome by the operation force is the friction force of the valve rod and the filler and the thrust generated by the pressure of the medium, and the force for closing the valve is larger than the force for opening the valve, so that the diameter of the valve rod is larger, otherwise, the valve rod is in a bending fault. The connection mode is divided into three types: flange connection, screw thread connection and welding connection. After the self-sealing valve appears, the medium flow direction of the stop valve is changed from the upper part of the valve clack to the valve cavity, at this time, under the action of medium pressure, the force for closing the valve is small, the force for opening the valve is large, and the diameter of the valve rod can be correspondingly reduced. At the same time, the valve in this form is also tighter under the action of the medium, so the use of the stop valve is greatly favored.
There are various prior art shut-off valves, but there are no overload shut-off valves that are capable of protecting against overload conditions, and in the prior art, a separate relief valve is often used to achieve pressure relief at the time of relief, which is relatively cumbersome.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the pneumatic overload stop valve which can effectively cope with the emergency when the air source pressure is overlarge, can automatically cope with the conditions of load increase and the overlarge air source pressure after passing the pressure regulating test, can automatically cut off the air source, ensures the safety of other equipment on a pipeline and the safety of personnel, and further ensures the safety of the conveying process.
To this end, the invention provides a pneumatic overload stop valve, comprising a valve body and a cover plate; the cover plate is connected with the upper end of the valve body through bolts; the two opposite sides of the valve body are respectively provided with an air inlet and an air outlet, the upper part of the air inlet is provided with a pressure regulating air chamber, an air inlet one-way valve and an air outlet one-way valve are arranged in the pressure regulating air chamber, two channels for the air inlet to be communicated with the air inlet one-way valve and the air outlet one-way valve are arranged on the air inlet, the upper part of the air outlet is provided with a control air chamber, the air inlet one-way valve and the air outlet one-way valve are respectively communicated with the control air chamber, a piston assembly for blocking the air outlet when the air pressure is overlarge is arranged in the control air chamber, and a piston exhaust hole communicated with the control air chamber and used for piston movement exhaust is arranged in the middle of the valve body; the upper part of the pressure regulating air chamber is communicated with the upper part of the control air chamber.
The air inlet one-way valve comprises a pressure regulating screw, a pressure regulating spring seat, a pressure regulating spring and a pressure regulating sealing ball; the pressure regulating screw is connected with the pressure regulating spring holder, and pressure regulating spring holder and pressure regulating spring's upper end connection, and pressure regulating spring lower extreme connection has the pressure regulating base, and the pressure regulating base lower extreme is equipped with the arc wall that is used for blocking the pressure regulating seal ball, and the pressure regulating seal ball sets up in the arc wall of pressure regulating base lower extreme.
The one-way exhaust valve comprises a pressure relief sealing seat, a pressure relief sealing ball and a pressure relief spring, a pressure relief passage is arranged in the pressure relief sealing seat, the bottom end of the pressure relief passage is provided with the pressure relief sealing ball, and the lower end of the pressure relief sealing ball is provided with the pressure relief spring.
The piston assembly comprises an upper screw, a piston and a piston rod; the upper screw is connected with the upper end of the piston rod, and pistons are arranged around the connection part of the upper screw and the upper end of the piston rod; the lower part of the piston is provided with a piston spring sleeved in the middle of the piston rod, the lower part of the piston spring is provided with a guide sleeve encircling the lower end of the piston rod, the contact surface between the guide sleeve and the piston rod is internally provided with a sealing gasket, and the lower end of the piston is provided with a valve clack.
The air inlet and the air outlet are in the same level, and the body is cut off between the air inlet and the air outlet, so that the air enters the lower part of the control air chamber after entering through the air inlet, and is discharged through the air outlet.
The piston exhaust holes are formed in two sides of the valve body, which are respectively positioned at the lower part of the piston and at the upper part of the guide sleeve.
Pressure regulating air chamber and control air chamber are equipped with pressure sensor, and the apron upper portion is equipped with the display that is connected with pressure sensor.
And the contact surface of the guide sleeve and the piston rod is oil sealed.
The beneficial effects of the invention are as follows: compared with the prior art, the pneumatic overload stop valve provided by the invention can replace the original overflow valve, the safety and the intelligent degree of the pneumatic overload stop valve are improved, the conveying line can be protected, and dangerous accidents caused by overlarge air source pressure or increased load in the conveying line are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. In the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a schematic front sectional structure of the present invention.
Fig. 2 is a schematic side sectional structure of the present invention.
Fig. 3 is a schematic view of the structure of the valve clack of the present invention.
Fig. 4 is a schematic structural view of a guide sleeve according to the present invention.
Fig. 5 is a schematic view of the piston rod structure of the present invention.
Fig. 6 is a schematic structural view of a pressure regulating spring seat according to the present invention.
Fig. 7 is a schematic view of a piston structure according to the present invention.
Fig. 8 is a schematic structural diagram of a pressure relief seal seat according to the present invention.
Fig. 9 is a schematic view of a cylinder structure of the present invention.
Fig. 10 is a schematic diagram of a cover plate structure according to the present invention.
The valve clack 1, a sealing gasket 2, a guide sleeve 3, a piston spring 4, a piston rod 5, a process hole 6, a pressure regulating base 7, a pressure regulating spring 8, a pressure regulating spring seat 9, a piston exhaust hole 10, a piston screw 11, a rubber vulcanization body 12, a pressure relief spring 13, a cutting-off body 14, a piston 15, a cover plate 16, a pressure regulating screw 17, a pressure relief sealing seat 18, a cylinder 19, an air inlet 20, a pressure relief sealing ball 21, a valve body 22, a control air chamber 23, a pressure regulating air chamber 24 and an air outlet 25.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
As shown in fig. 1 to 10: the pneumatic overload stop valve of the present embodiment includes a valve body 22 and a cover plate 16; the cover plate 16 is connected with the upper end of the valve body 22 through bolts; the two opposite sides of the valve body 22 are respectively provided with an air inlet 20 and an air outlet 25, the upper part of the air inlet 20 is provided with a pressure regulating air chamber 24, an air inlet one-way valve and an air outlet one-way valve are arranged in the pressure regulating air chamber 24, two channels for the air inlet 20 to be communicated with the air inlet one-way valve and the air outlet one-way valve are arranged on the air inlet 20, the upper part of the air outlet 25 is provided with a control air chamber 23, the air inlet one-way valve and the air outlet one-way valve are respectively communicated with the control air chamber 23, a piston assembly for blocking the air outlet 25 when the air pressure is overlarge is arranged in the control air chamber 23, and a piston exhaust hole 10 communicated with the control air chamber 23 and used for moving and exhausting the piston 15 is arranged in the middle part of the valve body 22; the upper part of the pressure regulating air chamber 24 is communicated with the upper part of the control air chamber 23.
In this embodiment, under the normal pressure condition, the air source enters from the air inlet 20 and is discharged from the air outlet 25, at this time, due to the adjustability of the pressure regulating screw 17, the pressure value is set at a specific value, so that the air source cannot enter through the air inlet check valve if the pressure is smaller than the value, at this time, the air source enters from the air inlet 20 into the air outlet 25 and is directly discharged, when the air pressure at one end of the air outlet 25 rises, so that the pressure at one side of the air inlet 20 reaches the set value of the pressure regulating screw 17, the air source pushes the pressure regulating sealing ball, the air source enters into the pressure regulating air chamber 24 through the air inlet check valve, and thus enters into the control air chamber 23 through the pressure regulating air chamber 24, and in the control air chamber 23, the air source presses the piston 15 downwards, so that the piston assembly moves downwards to seal the air outlet 25. Further, when the pressure in the control air chamber 23 continues to increase to a certain value, the air source will push the pressure release sealing ball 21 open, so that the air source is discharged through the air discharge check valve, thereby completing the pressure release action and protecting other devices connected to one end of the air outlet 25.
Further, the air inlet one-way valve comprises a pressure regulating screw 17, a pressure regulating spring seat 9, a pressure regulating spring 8 and a pressure regulating sealing ball; the pressure regulating screw 17 is connected with the pressure regulating spring holder 9, and the upper end connection of pressure regulating spring holder 9 and pressure regulating spring 8, pressure regulating spring 8 lower extreme connection have pressure regulating base 7, and pressure regulating base 7 lower extreme is equipped with the arc wall that is used for blocking the pressure regulating seal ball, and the pressure regulating seal ball sets up in the arc wall of pressure regulating base 7 lower extreme.
The tightness of the pressure regulating spring 8 is regulated by the pressure regulating screw 17 so as to realize the pressure value required by the sliding of the pressure regulating sealing ball, when the pressure is larger than the pressure value, the pressure regulating sealing ball moves upwards, so that the chamber where the pressure regulating sealing ball is positioned is communicated with the control air chamber 23, and conversely, when the pressure value is smaller than the pressure value, the air source is discharged from the air inlet 20 to the air outlet 25.
Further, the exhaust check valve comprises a pressure relief sealing seat 18, a pressure relief sealing ball 21 and a pressure relief spring 13, a pressure relief passage is arranged in the pressure relief sealing seat 18, the bottom end of the pressure relief passage is provided with the pressure relief sealing ball 21, and the lower end of the pressure relief sealing ball 21 is provided with the pressure relief spring 13.
The principle is the same as that of the air inlet check valve, except that the conduction directions of the air inlet check valve and the air outlet check valve are opposite. As shown, when the pressure in the control air chamber 23 increases enough to push the pressure release sealing ball 21 open, the exhaust check valve acts, and in particular, in this embodiment, the pressure required for the downward movement of the piston assembly is less than the pressure required for the movement of the pressure release sealing ball 21.
In addition, as an extension of the present embodiment, the pressure values and the sensitivities of the intake check valve and the exhaust check valve may be set to be adjustable.
The piston assembly comprises an upper screw, a piston 15 and a piston rod 5; the upper screw is connected with the upper end of the piston rod 5, and pistons 15 are arranged around the connection part of the upper screw and the upper end of the piston rod 5; the lower part of the piston 15 is provided with a piston spring 4 sleeved in the middle of the piston rod 5, the lower part of the piston spring 4 is provided with a guide sleeve 3 encircling the lower end of the piston rod 5, the contact surface between the guide sleeve 3 and the piston rod 5 is provided with a sealing gasket 2, and the lower end of the piston 15 is provided with a valve clack 1.
The motion principle of the piston assembly is that when the air source counts into the control air chamber 23, and then the piston 15 is pushed to move downwards, the piston 15 slides downwards along the piston rod 5, the effect of increasing the volume of the control air chamber 23 for containing air is achieved, and then, in the process of sliding the piston 15 downwards, the piston spring 4 is contracted, and the piston rod 5 moves towards the air inlet 20 without deviation under the action of the guide sleeve 3, the guide sleeve 3 is fixed in the valve body 22, the displacement guide function is achieved, and the piston exhaust hole 10 is arranged between the piston 15 and the guide sleeve 3, so that the air pressure and the atmospheric pressure of the piston 15 are kept balanced in the downward moving process. Furthermore, the lower end of the piston 15 is provided with the valve clack 1 for blocking the air outlet 25, so that the valve clack 1 is larger than the air outlet 25, and the sealing structure is adopted to ensure that the valve clack 1 keeps sealing and airtight while blocking the air outlet 25, and the opening direction of the right side of the air outlet 25 is upward, and the passage state of the air inlet 20 is in an inverted L shape. In addition, in the present embodiment, the piston assembly is disposed in the cylinder 19, and the cylinder 19 is configured as shown in the figure, and the piston exhaust hole 10 corresponds to a hole formed in the cylinder 19.
The air inlet 20 and the air outlet 25 are at the same level, and the body 14 is cut off between the air inlet 20 and the air outlet 25, so that after entering through the air inlet 20, the air enters the lower part of the control air chamber 23 and is discharged through the air outlet 25. The valve clack 1 is convenient to set for plugging the air outlet 25, and the valve clack 1 of the embodiment is embedded with a rubber vulcanized body 12.
The two piston exhaust holes 10 are respectively arranged at two sides of the valve body 22 at the lower part of the piston 15 and at the upper part of the guide sleeve 3. The two piston exhaust holes 10 or the plurality of piston exhaust holes 10 can enable the piston 15 to move down quickly to realize quick blocking of the air outlet 25, and the arrangement position of the piston exhaust holes 10 is required to be capable of meeting the condition that the air source cannot leak from the air source after entering the control air chamber 23.
The side of the valve body 22 is provided with a process hole 6 communicated with the upper part of the control air chamber 23, so that the processing of equipment is facilitated.
Pressure sensors are arranged in the pressure regulating air chamber 24 and the control air chamber 23, and a display connected with the pressure sensors is arranged at the upper part of the cover plate 16. The pressure regulation is realized by adopting the pressure regulating screw 17 or other mechanical structures singly or has a plurality of inconveniences, so the design pressure sensor can realize real-time monitoring on internal pressure, overload operation is avoided, or the gas circuit operation state can be effectively monitored.
The contact surface of the guide sleeve 3 and the piston rod 5 is oil sealed. In addition, in this embodiment, as shown in the drawings, there are multiple sealing structures, which should be within the protection scope of the present application, and will not be described in detail.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims (6)

1. The pneumatic overload stop valve is characterized by comprising a valve body and a cover plate; the cover plate is connected with the upper end of the valve body through bolts; the two opposite sides of the valve body are respectively provided with an air inlet and an air outlet, the upper part of the air inlet is provided with a pressure regulating air chamber, an air inlet one-way valve and an air outlet one-way valve are arranged in the pressure regulating air chamber, two channels for the air inlet to be communicated with the air inlet one-way valve and the air outlet one-way valve are arranged on the air inlet, the upper part of the air outlet is provided with a control air chamber, the air inlet one-way valve and the air outlet one-way valve are respectively communicated with the control air chamber, a piston assembly for blocking the air outlet when the air pressure is overlarge is arranged in the control air chamber, and a piston exhaust hole communicated with the control air chamber and used for piston movement exhaust is arranged in the middle of the valve body; the upper part of the pressure regulating air chamber is communicated with the upper part of the control air chamber; the air inlet one-way valve comprises a pressure regulating screw, a pressure regulating spring seat, a pressure regulating spring and a pressure regulating sealing ball; the pressure regulating screw is connected with the pressure regulating spring seat, the pressure regulating spring seat is connected with the upper end part of the pressure regulating spring, the lower end part of the pressure regulating spring is connected with the pressure regulating base, the lower end of the pressure regulating base is provided with an arc-shaped groove for clamping the pressure regulating sealing ball, and the pressure regulating sealing ball is arranged in the arc-shaped groove at the lower end of the pressure regulating base; the one-way exhaust valve comprises a pressure relief sealing seat, a pressure relief sealing ball and a pressure relief spring, a pressure relief passage is arranged in the pressure relief sealing seat, the bottom end of the pressure relief passage is provided with the pressure relief sealing ball, and the lower end of the pressure relief sealing ball is provided with the pressure relief spring.
2. A pneumatic overload shutoff valve as claimed in claim 1 wherein the piston assembly includes an upper screw, a piston and a piston rod; the upper screw is connected with the upper end of the piston rod, and pistons are arranged around the connection part of the upper screw and the upper end of the piston rod; the lower part of the piston is provided with a piston spring sleeved in the middle of the piston rod, the lower part of the piston spring is provided with a guide sleeve encircling the lower end of the piston rod, the contact surface between the guide sleeve and the piston rod is internally provided with a sealing gasket, and the lower end of the piston is provided with a valve clack.
3. A pneumatic overload stop valve according to claim 1 wherein the inlet and outlet are at the same level and the body is cut off between the inlet and outlet so that gas enters the lower part of the control chamber after entering through the inlet and exits through the outlet.
4. A pneumatic overload stop valve according to claim 1 wherein the piston exhaust holes are provided in two, one on each side of the valve body in the lower part of the piston and in the upper part of the guide sleeve.
5. A pneumatic overload stop valve according to any one of claims 1 to 4 wherein pressure sensors are provided in both the pressure regulating chamber and the control chamber, and a display connected to the pressure sensors is provided in the upper part of the cover plate.
6. A pneumatic overload stop valve according to claim 2 wherein the contact surface of the guide sleeve and the piston rod is oil sealed.
CN201910753583.8A 2019-08-15 2019-08-15 Pneumatic overload stop valve Active CN110375095B (en)

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CN201910753583.8A CN110375095B (en) 2019-08-15 2019-08-15 Pneumatic overload stop valve

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Application Number Priority Date Filing Date Title
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CN110375095A CN110375095A (en) 2019-10-25
CN110375095B true CN110375095B (en) 2024-04-30

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221232A (en) * 1977-02-11 1980-09-09 Fabbrica Italiana Magneti Marelli S.P.A. Shut off valve units of damaged sections in pneumatic multi-section braking systems of vehicles
CN2697370Y (en) * 2004-04-28 2005-05-04 黄培华 Control pneumatic valve
DE102007016457A1 (en) * 2007-03-30 2008-10-02 J. Schmalz Gmbh Pneumatically operable fixing device for workpieces has additional separate vacuum connection for vacuum chamber and is provided with shut-off valve or check valve, and with ventilating device for vacuum chamber
CN201382045Y (en) * 2009-04-22 2010-01-13 黄培华 Pressure regulating control air valve
CN201751598U (en) * 2010-07-05 2011-02-23 侯保银 Arbitrary adjusted control valve
CN105065713A (en) * 2015-08-11 2015-11-18 华南理工大学 Intake valve with pressure regulating function
CN105864461A (en) * 2016-05-22 2016-08-17 河北睿智辰诚液压机械科技有限公司 Improved slow-down control air valve
CN210372158U (en) * 2019-08-15 2020-04-21 武汉福龙自动控制阀门有限公司 Pneumatic overload stop valve

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221232A (en) * 1977-02-11 1980-09-09 Fabbrica Italiana Magneti Marelli S.P.A. Shut off valve units of damaged sections in pneumatic multi-section braking systems of vehicles
CN2697370Y (en) * 2004-04-28 2005-05-04 黄培华 Control pneumatic valve
DE102007016457A1 (en) * 2007-03-30 2008-10-02 J. Schmalz Gmbh Pneumatically operable fixing device for workpieces has additional separate vacuum connection for vacuum chamber and is provided with shut-off valve or check valve, and with ventilating device for vacuum chamber
CN201382045Y (en) * 2009-04-22 2010-01-13 黄培华 Pressure regulating control air valve
CN201751598U (en) * 2010-07-05 2011-02-23 侯保银 Arbitrary adjusted control valve
CN105065713A (en) * 2015-08-11 2015-11-18 华南理工大学 Intake valve with pressure regulating function
CN105864461A (en) * 2016-05-22 2016-08-17 河北睿智辰诚液压机械科技有限公司 Improved slow-down control air valve
CN210372158U (en) * 2019-08-15 2020-04-21 武汉福龙自动控制阀门有限公司 Pneumatic overload stop valve

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