CN110805727B - Safety valve - Google Patents
Safety valve Download PDFInfo
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- CN110805727B CN110805727B CN201911121739.7A CN201911121739A CN110805727B CN 110805727 B CN110805727 B CN 110805727B CN 201911121739 A CN201911121739 A CN 201911121739A CN 110805727 B CN110805727 B CN 110805727B
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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
- 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
- F16K17/10—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 auxiliary valve for fluid operation of the main valve
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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
- 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
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
Abstract
The invention discloses a safety valve which comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, and the valve body is provided with an outlet pipe and an inlet pipe; a main valve seat is arranged in the valve cavity; a valve cover is fixedly installed at an opening at the upper end of the valve cavity, the valve cover is provided with a gear groove with an opening at the upper end, and the bottom of the gear groove is provided with a rotating hole for penetrating a pipe; a plunger piston hole which penetrates through the valve cover is arranged in the valve cover; a main control rod is rotationally connected in the rotary hole, and the lower end of the main control rod is rotationally connected to the main valve seat; the main control rod is provided with a power gear; a rack rod is connected in the plunger hole in a sliding manner; the main valve seat is provided with a first valve hole, the main control rod is fixedly provided with a main valve core, and the main valve core is provided with a second valve port; the main control rod is sleeved with a first spring; the valve cover is provided with a pilot valve assembly; the safety valve is simple in structure, and the valve clamping phenomenon caused by accumulated machining errors of the main valve core is avoided; meanwhile, the collision between the main valve core and the main valve seat during opening and closing can be avoided.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a safety valve.
Background
The pilot operated safety valve is mainly used for the best overpressure protection device on pressure equipment, containers or pipelines in the fields of petroleum, chemical industry, electric power, metallurgy and the like. In practical application, machining errors can be generated due to machining of the valve body and the guide sleeve, and during assembly, due to accumulated errors, the concentricity of the main valve core and the main valve seat can be deviated sometimes, so that the main valve is insensitive to movement, and the safety valve cannot be opened under rated pressure. Impurities can be attached to the sealing surface of the main valve core when the main valve core is opened, the sealing of the main valve core is poor when the main valve core is closed, and the sealing surface and the valve seat of the main valve core can be damaged; the traditional valve core collides with the sealing surface of the valve seat when being opened and closed, so that the valve core and the sealing surface of the valve seat are damaged, and the service life is influenced; when the traditional pilot operated safety valve works, the main valve is rapidly opened and closed, so that great pressure impact can be caused, great burden can be brought to the system by the pressure impact, and the service life of the system is shortened; the pilot valve used by the existing safety valve is generally in a seat valve form, and can collide when the pilot valve core and the pilot valve seat are closed, so that a sealing surface between the pilot valve core and the pilot valve seat is damaged, the pilot valve is opened in advance when the set pressure is not reached, and the safety valve cannot work normally.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a safety valve which is simple in structure and avoids the valve clamping phenomenon of a main valve core due to accumulated machining errors; meanwhile, the collision between the main valve core and the main valve seat during opening and closing can be avoided.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a safety valve comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, an outlet pipe communicated with the valve cavity is arranged on the circumferential side surface of the valve body, and an inlet pipe communicated with the valve cavity is arranged at the bottom of the valve body; a main valve seat for separating the inlet pipe and the outlet pipe is arranged in the valve cavity; a valve cover is fixedly arranged at an opening at the upper end of the valve cavity, a gear groove with an opening at the upper end is arranged at the center of the valve cover, and a through rotating hole is arranged at the center of the bottom of the gear groove; a plunger piston hole penetrating through the valve cover is arranged in the valve cover along the direction vertical to the axis of the rotary hole, and the plunger piston hole is communicated with the gear groove; a main control rod is rotationally connected in the rotary hole, and the lower end of the main control rod is rotationally connected to a main valve seat; the main control rod is provided with a power gear on the circumferential side surface in the gear groove; a rack rod meshed with the power gear is connected in the plunger hole in a sliding manner; the main valve seat is provided with a first valve hole for communicating the inlet pipe and the outlet pipe, the main control rod is fixedly provided with a main valve core, and the main valve core is provided with a second valve port; the main control rod is sleeved with a first spring which is positioned between the valve cover and the main valve core and used for forcing the main valve core to be tightly pressed on the main valve seat; the valve cover is provided with a pilot valve assembly, when the pressure in the inlet pipe is smaller than the preset pressure of the pilot valve assembly, the rack rod is located at one end of the plunger hole, the first valve hole and the second valve hole are completely staggered, when the pressure in the inlet pipe is larger than the preset pressure of the pilot valve assembly, the rack rod moves from one end of the plunger hole to the other end of the plunger hole, and drives the main valve core to rotate through the power gear and the main control rod, so that the first valve hole and the second valve hole are intersected until completely overlapped.
In a further technical scheme, the pilot valve assembly comprises a pilot control rod, a second spring, a pilot valve core, a cover body and a valve block, the valve block is fixedly arranged above the valve cover, a rotating groove is formed in the upper end of the valve block, a shaft hole is formed in the center of the bottom of the rotating groove, and the pilot control rod is connected in the shaft hole in a sliding mode; the pilot valve core is rotationally connected to the pilot control rod and is positioned in the rotating groove, and the cover body is fixedly arranged on the valve block and covers the opening at the upper end of the rotating groove to prevent the pilot valve core from separating from the rotating groove; the second spring is positioned in the cover body, and the lower end of the second spring is abutted against the upper end of the pilot control rod and used for forcing the pilot control rod to move downwards; two positioning chutes with opposite positions are arranged on the inner side wall of the cover body along the vertical direction, and two positioning bulges extending into the positioning chutes are arranged on the pilot control rod; a spiral groove is formed in the inner side wall of the pilot valve core, which is rotatably connected with the pilot control rod, and a convex column extending into the spiral groove is arranged on the circumferential side surface of the pilot control rod;
a first plug and a second plug are respectively arranged at two ends of the plunger hole, a first control cavity is formed between one end of the rack rod and the first plug in the plunger hole, and a second control cavity is formed between the other end of the rack rod and the second plug; a pilot control cavity is formed between the lower end of the pilot control rod and the lower end of the shaft hole in the shaft hole, a first through hole for communicating the inlet pipe with the pilot control cavity and a second through hole communicated with the outlet pipe are formed in the valve body, the valve cover and the valve block, and a third through hole for communicating the rotating groove with the first through hole and a fourth through hole for communicating the rotating groove with the second through hole are formed in the valve block; a fifth through-flow hole for communicating the rotating groove with the first control cavity and a sixth through-flow hole for communicating the rotating groove with the second control cavity are formed in the valve block and the valve cover; the pilot valve core is provided with a first arc-shaped communicating groove and a second arc-shaped communicating groove on the surface facing the bottom of the rotating groove; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is smaller than the pre-tightening force of the second spring, the first arc-shaped communicating groove communicates the third through-flow hole with the fifth through-flow hole, and the second arc-shaped communicating groove communicates the fourth through-flow hole with the sixth through-flow hole; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is larger than the pre-tightening force of the second spring, the third through flow hole is communicated with the sixth through flow hole through the first arc-shaped communicating groove, and the fourth through flow hole is communicated with the fifth through flow hole through the second arc-shaped communicating groove.
In a further technical scheme, the upper end of guide's control lever is equipped with the positioning disk, the setting of location arch is on the circumference side of positioning disk, the lower extreme of second spring is contradicted on the positioning disk.
In a further technical scheme, a positioning column extending vertically and upwards is arranged at the center of the positioning disc, and the lower end of the second spring is sleeved on the positioning column.
In a further technical scheme, the cover body is rotatably connected with a bolt, the lower end of the bolt extends into the cover body, and the upper end of the second spring is abutted against the lower end of the bolt through the first spring pad.
In a further technical scheme, a second spring pad sleeved on the main control rod is arranged at the upper end of the first spring.
(III) advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) the rack rod and the power gear on the main control rod are matched to drive the main valve core to rotate, so that the opening and closing of the first valve hole are realized, and the valve clamping phenomenon caused by accumulated machining errors of the main valve core is avoided; meanwhile, the collision between the main valve core and the main valve seat during opening and closing is avoided, the sealing surface of the main valve seat is protected, and the service life is longer;
(2) the rack rod and the power gear on the main control rod are matched to drive the main valve core to rotate, so that the first valve hole is opened and closed, the first valve hole is not opened rapidly like a traditional pilot safety valve, but is opened slowly from small to large in opening area, and system pressure impact can be reduced;
(3) the mode that the main valve core rotates to open and close the first valve hole enables impurities attached to the sealing surfaces to be hung along with the closing of the main valve core, the impurities are not pressed between the sealing surfaces to cause the damage of the sealing surfaces, and the service life is long;
(4) the pilot valve core adopts a rotating mode, so that the pilot valve core cannot collide when being opened and closed, and the service life is prolonged; meanwhile, impurities attached to the sealing surface of the pilot valve core can be hung when the pilot valve core is closed, the sealing surface cannot be damaged, and the service life is longer.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a block diagram of the present invention;
FIG. 5 is a cross-sectional view taken in the direction A-A of FIG. 2 with the safety valve closed;
FIG. 6 is a cross-sectional view taken in the direction A-A of FIG. 2 with the relief valve open;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 8 is a cross-sectional view taken along line D-D of FIG. 2;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 6;
FIG. 10 is a cross-sectional view in the direction E-E of FIG. 8 with the safety valve closed;
FIG. 11 is a cross-sectional view in the direction E-E of FIG. 8 with the relief valve open;
FIG. 12 is a cross-sectional view taken in the direction F-F of FIG. 8;
FIGS. 13-14 are block diagrams of the valve block of the present invention;
FIG. 15 is a block diagram of a main poppet of the present invention;
FIGS. 16-18 are structural views of the pilot valve cartridge of the present invention;
FIG. 19 is a block diagram of the pilot control lever of the present invention;
fig. 20 is a structural view of the cover of the present invention.
Detailed Description
Referring to fig. 1-20, a safety valve includes a valve body 1, a valve cavity 101 with an open upper end is provided in the valve body 1, an outlet pipe 102 communicated with the valve cavity 101 is provided on a circumferential side surface of the valve body 1, and an inlet pipe 103 communicated with the valve cavity 101 is provided at a bottom of the valve body 1; a main valve seat 104 for separating an inlet pipe 103 and an outlet pipe 102 is arranged in the valve cavity 101; a valve cover 6 is fixedly installed at an opening at the upper end of the valve cavity 101, a gear groove 61 with an opening at the upper end is formed in the center of the valve cover 6, and a through rotating hole 62 is formed in the center of the bottom of the gear groove 61; a plunger hole 63 penetrating through the valve cover 6 is formed in the valve cover 6 along the direction perpendicular to the axis of the rotary hole 62, and the plunger hole 63 is communicated with the gear groove 61; the rotating hole 62 is rotatably connected with a main control rod 3, and the lower end of the main control rod 3 is rotatably connected to a main valve seat 104; the main control rod 3 is provided with a power gear 4 on the circumferential side in a gear groove 61; a rack rod 13 meshed with the power gear 4 is connected in the plunger hole 63 in a sliding manner; first valve holes 1c for communicating an inlet pipe 103 with an outlet pipe 102 are symmetrically formed in the main valve seat 104 on two sides of a main control rod, a main valve core 2 is fixedly mounted on the main control rod 3 through a pin key, and two second valve ports 2b are symmetrically formed in the main valve core 2; a first spring 5 which is positioned between the valve cover 6 and the main valve core 2 and used for forcing the main valve core 2 to be tightly pressed on the main valve seat 104 is sleeved on the main control rod 3; the upper end of the first spring 5 is provided with a second spring pad 51 which is sleeved on the main control rod 3, and the friction force between the upper end of the first spring 5 and the valve cover 6 can be reduced by arranging the second spring pad 51; the valve cover 6 is provided with a pilot valve assembly, when the pressure in the inlet pipe 103 is smaller than the preset pressure of the pilot valve assembly, the rack rod 13 is located at one end of the plunger hole 63, the first valve hole 1c and the second valve hole 2b are completely staggered, and when the pressure in the inlet pipe 103 is larger than the preset pressure of the pilot valve assembly, the rack rod 13 moves from one end of the plunger hole 63 to the other end and drives the main valve element 2 to rotate through the power gear 4 and the main control rod 3, so that the first valve hole 1c and the second valve hole 2b are intersected until completely overlapped.
The pilot valve assembly comprises a pilot control rod 9, a second spring 11, a pilot valve core 8, a cover body 10 and a valve block 7, wherein the valve block 7 is fixedly arranged above the valve cover 6, the upper end of the valve block 7 is provided with a rotating groove 71, the bottom center of the rotating groove 71 is provided with a shaft hole 72, and the pilot control rod 9 is connected in the shaft hole 72 in a sliding manner; the pilot valve spool 8 is rotatably connected to the pilot control rod 9 and is located in the rotating groove 71, and the cover 10 is fixedly installed on the valve block 7 and covers an opening at the upper end of the rotating groove 71 to prevent the pilot valve spool 8 from being separated from the rotating groove 71; the second spring 11 is positioned in the cover 10, and the lower end of the second spring abuts against the upper end of the pilot control rod 9 to force the pilot control rod 9 to move downwards; two positioning chutes 10a with opposite positions are arranged on the inner side wall of the cover body 10 along the vertical direction, a positioning disc 91 is arranged at the upper end of the pilot control rod 9, two positioning protrusions 9b extending into the positioning chutes 10a are arranged on the circumferential side surface of the positioning disc 91, and the lower end of the second spring 11 is abutted against the positioning disc 91; the inner side wall of the pilot valve core 8 rotatably connected with the pilot control rod 9 is provided with a spiral groove 8a, and the circumferential side surface of the pilot control rod 9 is provided with a convex column 9a extending into the spiral groove 8 a. In order to prevent the lower end of the second spring 11 from sliding, a positioning column 92 extending vertically upwards is arranged at the center of the positioning disc 91, and the lower end of the second spring 11 is sleeved on the positioning column 92.
A first plug 64 and a second plug 65 are respectively arranged at two ends of the plunger hole 63, a first control cavity 6e is formed between one end of the rack rod 13 and the first plug 64 in the plunger hole, and a second control cavity 6f is formed between the other end of the rack rod 13 and the second plug 65; a pilot control chamber 7c is formed in the shaft hole 72 between the lower end of the pilot control lever 9 and the lower end of the shaft hole 72, first through- flow holes 1a, 6a, 7h, 7f for communicating the inlet pipe 103 with the pilot control chamber 7c and second through- flow holes 1b, 6b, 7i, 7g for communicating with the outlet pipe 102 are provided in the valve body 1, the bonnet 6 and the valve block 7, and a third through-flow hole 7a for communicating the rotary groove 71 with the first through-flow holes and a fourth through-flow hole 7b for communicating the rotary groove 71 with the second through-flow holes are provided in the valve block 7; fifth through- flow holes 6c, 7p, 7r, 7m, 7e for communicating the rotary groove 71 with the first control chamber 6e, and sixth through- flow holes 6d, 7q, 7s, 7k, 7d for communicating the rotary groove 71 with the second control chamber 6f are provided in the valve block 7 and the valve cover 6; the pilot valve core 8 is provided with a first arc-shaped communicating groove 8b and a second arc-shaped communicating groove 8c on the surface facing the bottom of the rotating groove 71; when the pressure of the medium in the inlet pipe 103 acting on the lower end of the pilot control rod 9 is smaller than the pre-tightening force of the second spring 11, the first arc-shaped communication groove 8b communicates the third through-flow hole 7a with the fifth through-flow hole 7e, and the second arc-shaped communication groove 8c communicates the fourth through-flow hole 7b with the sixth through-flow hole 7 d; when the pressure of the medium in the inlet pipe 103 acting on the lower end of the pilot control lever 9 is greater than the biasing force of the second spring 11, the first arc-shaped communication groove 8b communicates the third through-flow hole 7a with the sixth through-flow hole 7d, and the second arc-shaped communication groove 8c communicates the fourth through-flow hole 7b with the fifth through-flow hole 7 e.
In addition, a bolt 77 is rotatably connected to the cover 10, the lower end of the bolt 77 extends into the cover 10, and the upper end of the second spring 11 abuts against the lower end of the bolt 77 through a first spring pad 78; the setting of the screw 77 enables the adjustment of the pretension of the second spring 11.
When the safety valve works, medium enters the valve cavity 101 from the inlet pipe 103, and when the system pressure does not exceed the set pressure of the pilot valve assembly, the medium enters the first control cavity 6e through the inlet pipe 103, the first through- flow holes 1a, 6a, 7h and 7f, the third through-flow hole 7a, the first arc-shaped communication groove 8b, the fifth through- flow holes 7e, 7m, 7r, 7p and 6 c; the second control chamber 6f is communicated with the outlet pipe 102 through the sixth through holes 7d, 7k, 7s, 7q, 6d, the second arc-shaped communication groove 8c, the fourth through hole 7b, the second through holes 7g, 7i, 6b, 1b, at this time, because the medium pressure in the inlet pipe 103 is greater than the medium pressure in the outlet pipe 102, the rack bar 13 is pushed to the rightmost end by the medium (as shown in fig. 8), and the power gear 4 matched with the rack bar is driven to rotate, so that the main valve core 2 is driven by the main control rod 3 to rotate to a state that the first valve hole 1c is completely separated from the second valve hole 2b and is kept still (as shown in fig. 5); when the pressure of the system medium rises and exceeds the set pressure value of the pilot valve assembly, the medium enters the pilot control chamber 7c through the inlet pipe 103, the first through-flow hole and the third through-flow hole 7a, overcomes the force of the second spring 11 acting on the pilot control rod 9, and pushes the pilot control rod 9 to move upwards, due to the matching of the positioning protrusion 9b on the pilot control rod 9 and the positioning chute 10a and the matching relationship of the convex column 9a and the spiral groove 8a, the pilot control rod 9 moves upwards to drive the pilot valve spool 8 to rotate around the pilot control rod 9, when the pilot control rod 9 moves upwards to the position shown in fig. 6, the thrust of the system medium acting on the lower end of the pilot control rod 9 is balanced with the pre-tightening force of the second spring 11, at the moment, the state of the pilot valve spool 8 is shown in fig. 11, and the medium passes through the inlet pipe 103, the first through-flow hole and the third through, The first arc-shaped communication groove 8b and the sixth through-flow hole enter the second control chamber 6f, and at this time, the medium in the first control chamber 6e is discharged out of the outlet pipe 102 through the fifth through-flow hole, the second arc-shaped communication groove 8c, the fourth through-flow hole 7b and the second through-flow hole, so that the medium pushes the rack rod 13 to move to the leftmost end leftwards and drives the power gear 4 matched with the rack rod to rotate, the power gear 4 drives the main valve element 2 to rotate through the main control rod 3, and the first valve hole 1c and the second valve hole 2b are intersected until the completely overlapped state is achieved and are kept still (as shown in fig. 6) to complete overflow.
After the pressure of the system medium is reduced, the pilot control rod 9 falls back under the action of the second spring 11, the pilot valve core 8 rotates back to the state shown in fig. 10, the rack rod 13 is pushed to the rightmost end position of the plunger hole 63 again to control the main valve core 2 to close, if impurities remain on the sealing surface at the moment, the main valve core 2 and the pilot valve core 8 hang the impurities on the sealing surface and close by fitting the sealing surface in the process that the main valve core 2 and the pilot valve core 8 rotate back to close, the sealing surface is protected, and the service life is prolonged; because main valve element 2 rotates and makes first valve opening 1c and second valve port 2b communicate or cut off, consequently the switching is more gentle, can not produce pressure impact, has promoted system life.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A safety valve is characterized by comprising a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, an outlet pipe communicated with the valve cavity is arranged on the circumferential side surface of the valve body, and an inlet pipe communicated with the valve cavity is arranged at the bottom of the valve body; a main valve seat for separating the inlet pipe and the outlet pipe is arranged in the valve cavity; a valve cover is fixedly arranged at an opening at the upper end of the valve cavity, a gear groove with an opening at the upper end is arranged at the center of the valve cover, and a through rotating hole is arranged at the center of the bottom of the gear groove; a plunger piston hole penetrating through the valve cover is arranged in the valve cover along the direction vertical to the axis of the rotary hole, and the plunger piston hole is communicated with the gear groove; a main control rod is rotationally connected in the rotary hole, and the lower end of the main control rod is rotationally connected to a main valve seat; the main control rod is provided with a power gear on the circumferential side surface in the gear groove; a rack rod meshed with the power gear is connected in the plunger hole in a sliding manner; the main valve seat is provided with a first valve hole for communicating the inlet pipe and the outlet pipe, the main control rod is fixedly provided with a main valve core, and the main valve core is provided with a second valve port; the main control rod is sleeved with a first spring which is positioned between the valve cover and the main valve core and used for forcing the main valve core to be tightly pressed on the main valve seat; when the pressure in the inlet pipe is greater than the preset pressure of the pilot valve assembly, the rack rod moves from one end of the plunger hole to the other end of the plunger hole and drives the main valve core to rotate through the power gear and the main control rod, so that the first valve hole and the second valve hole are intersected until the first valve hole and the second valve hole are completely overlapped;
the pilot valve assembly comprises a pilot control rod, a second spring, a pilot valve core, a cover body and a valve block, wherein the valve block is fixedly arranged above the valve cover, the upper end of the valve block is provided with a rotating groove, the bottom center of the rotating groove is provided with a shaft hole, and the pilot control rod is connected in the shaft hole in a sliding manner; the pilot valve core is rotationally connected to the pilot control rod and is positioned in the rotating groove, and the cover body is fixedly arranged on the valve block and covers the opening at the upper end of the rotating groove to prevent the pilot valve core from separating from the rotating groove; the second spring is positioned in the cover body, and the lower end of the second spring is abutted against the upper end of the pilot control rod and used for forcing the pilot control rod to move downwards; two positioning chutes with opposite positions are arranged on the inner side wall of the cover body along the vertical direction, and two positioning bulges extending into the positioning chutes are arranged on the pilot control rod; a spiral groove is formed in the inner side wall of the pilot valve core, which is rotatably connected with the pilot control rod, and a convex column extending into the spiral groove is arranged on the circumferential side surface of the pilot control rod;
a first plug and a second plug are respectively arranged at two ends of the plunger hole, a first control cavity is formed between one end of the rack rod and the first plug in the plunger hole, and a second control cavity is formed between the other end of the rack rod and the second plug; a pilot control cavity is formed between the lower end of the pilot control rod and the lower end of the shaft hole in the shaft hole, a first through hole for communicating the inlet pipe with the pilot control cavity and a second through hole communicated with the outlet pipe are formed in the valve body, the valve cover and the valve block, and a third through hole for communicating the rotating groove with the first through hole and a fourth through hole for communicating the rotating groove with the second through hole are formed in the valve block; a fifth through-flow hole for communicating the rotating groove with the first control cavity and a sixth through-flow hole for communicating the rotating groove with the second control cavity are formed in the valve block and the valve cover; the pilot valve core is provided with a first arc-shaped communicating groove and a second arc-shaped communicating groove on the surface facing the bottom of the rotating groove; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is smaller than the pre-tightening force of the second spring, the first arc-shaped communicating groove communicates the third through-flow hole with the fifth through-flow hole, and the second arc-shaped communicating groove communicates the fourth through-flow hole with the sixth through-flow hole; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is larger than the pre-tightening force of the second spring, the third through flow hole is communicated with the sixth through flow hole through the first arc-shaped communicating groove, and the fourth through flow hole is communicated with the fifth through flow hole through the second arc-shaped communicating groove.
2. The safety valve according to claim 1, wherein the pilot lever is provided at an upper end thereof with a positioning plate, the positioning projection is provided on a circumferential side surface of the positioning plate, and a lower end of the second spring abuts against the positioning plate.
3. The safety valve according to claim 2, wherein a positioning column extending vertically upwards is arranged at the center of the positioning disc, and the lower end of the second spring is sleeved on the positioning column.
4. The safety valve of claim 2, wherein a bolt is rotatably coupled to the cover, a lower end of the bolt extends into the cover, and an upper end of the second spring abuts against the lower end of the bolt through the first spring washer.
5. The safety valve of claim 1, wherein the upper end of the first spring is provided with a second spring pad sleeved on the main control rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911121739.7A CN110805727B (en) | 2019-11-15 | 2019-11-15 | Safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911121739.7A CN110805727B (en) | 2019-11-15 | 2019-11-15 | Safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110805727A CN110805727A (en) | 2020-02-18 |
| CN110805727B true CN110805727B (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911121739.7A Active CN110805727B (en) | 2019-11-15 | 2019-11-15 | Safety valve |
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| CN (1) | CN110805727B (en) |
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| CN111747218A (en) * | 2020-06-16 | 2020-10-09 | 武芳 | Controller for winding device of textile machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6843265B2 (en) * | 2002-04-16 | 2005-01-18 | Taylor Innovations, L.L.C. | Pressure relief system with supply activated valve |
| CN104791526B (en) * | 2015-03-12 | 2017-06-13 | 西安海智机电设备有限公司 | The mechanical super-pressure urgent block valve of ultralow pressure |
| CN106545677B (en) * | 2017-01-12 | 2019-07-16 | 天津市国威给排水设备制造有限公司 | Rotary pressure reducing valve |
| CN208982720U (en) * | 2018-07-27 | 2019-06-14 | 西华大学 | A kind of pressure maintaining valve |
| CN110360345B (en) * | 2019-07-26 | 2021-04-16 | 台州广博五金制品有限公司 | Anti-impact three-way pressure reducing valve |
| CN110345284B (en) * | 2019-07-26 | 2020-07-28 | 江苏海达船用阀业有限公司 | Check valve |
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2019
- 2019-11-15 CN CN201911121739.7A patent/CN110805727B/en active Active
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| CN110805727A (en) | 2020-02-18 |
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Effective date of registration: 20210526 Address after: No. 95 Huicheng Road, Huishan Economic Development Zone, Wuxi City, Jiangsu Province, 214000 Applicant after: Jiangsu Junyuan Equipment Manufacturing Co.,Ltd. Address before: No. 201, building 2, zone 1, No. 2, headquarters 2nd Road, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province, 523000 (cluster registration) Applicant before: DONGGUAN HAITE PAWO HYDRAULIC TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A safety valve Effective date of registration: 20221220 Granted publication date: 20210615 Pledgee: Wuxi rural commercial bank Limited by Share Ltd. Pledgor: Jiangsu Junyuan Equipment Manufacturing Co.,Ltd. Registration number: Y2022320010826 |