CN210716163U - Safety valve - Google Patents

Abstract

The utility model provides a safety valve belongs to valve technical field. It has solved the not good scheduling problem of current relief valve long-term use stability. This relief valve, which comprises a valve body, the valve cap, the seal receptacle, the lock cap, valve rod and stagnant water seat, the valve rod overcoat is equipped with the spring, the upper end of spring is supported and is leaned on the lock cap, the lower extreme of spring supports and leans on stagnant water seat, the seal receptacle supports and leans on the chamber wall of valve pocket and forms sealedly under the effect of spring, be provided with the fixed orifices on the stagnant water seat, convex fender arch has on the lateral surface of valve rod lower extreme, the lower extreme of valve rod is worn to establish in the fixed orifices and is kept off protruding lateral surface and fixed with the hole wall tight fit of fixed orifices, be provided with on the hole wall of fixed orifices and keep off the shoulder, it supports and leans on keeping off the shoulder to keep off protruding up the up end, fender ring and guide ring have on the down terminal surface of lock cap, the terminal surface department forms. This relief valve can improve the stability of long-term use.

Description

Safety valve

Technical Field

The utility model belongs to the technical field of the valve, a relief valve is related to.

Background

The valve is used for controlling the medium in the pipeline and is a mechanical product with a movable mechanism. The safety valve is a valve in which a switching element is in a normally closed state, and when the pressure of a medium in a device or a pipeline rises to exceed a specified value, the medium is discharged to the outside of a system to prevent the pressure of the medium in the pipeline or the device from exceeding the specified value.

The Chinese patent literature data discloses a safety valve of an electric water heater [ application number: CN 00251325.0; the notice number is: CN2438894Y ], which comprises a valve body with a water inlet cavity and a pressure relief cavity, a one-way water inlet valve and a pressure relief valve which are respectively arranged in the water inlet cavity and the pressure relief cavity, wherein the pressure relief valve is sealed at a channel of the water inlet cavity and the pressure relief cavity, and a manual mechanism for lifting the pull rod for pressure relief is arranged at the end part of a pull rod of the pressure relief valve; the pressure release valve is composed of a rubber film, a sealing base, a pull rod, a return spring and an adjusting cap which is pressed against the return spring, wherein the rubber film is in a bowl shape, the bowl edge of the rubber film is fixed on a boss on the inner wall of the valve body, and the bottom end of the pull rod is fixed on the rubber film and the sealing base and is pressed on the water inlet cavity and the passage opening of the pressure release cavity. The manual mechanism comprises a pressure relief seat arranged on the valve body, a knob sleeved on the pressure relief seat, and a clamp spring used for clamping the knob on the pull rod in a sliding manner, wherein a ring platform is arranged on the inner wall of the knob, the ring platform surface is three sawtooth wave surfaces which are arranged periodically, the pressure relief seat is provided with three fulcrums relative to the ring platform surface, and the knob is rotated, so that the sawtooth wave surfaces enable the knob to be spirally lifted under the action of the fulcrums and drive the pull rod to be lifted.

When the safety valve is used for manually releasing pressure, the knob is rotated to lift the pull rod, the rubber film and the sealing base cannot be jacked on the channel openings of the water inlet cavity and the pressure release cavity, and water enters the pressure release cavity from the water inlet cavity and then is discharged out of the valve body, so that manual pressure release is realized. After the knob is released, the pull rod automatically resets under the action of the reset spring, the rubber film and the sealing base are pressed on the channel openings of the water inlet cavity and the pressure relief cavity again to realize sealing, and the safety valve is in a state of automatic pressure relief. When the safety valve is in a state of automatic pressure relief, when the water pressure in the water inlet cavity is greater than the pressure of the reset spring, namely the threshold value of the safety valve, the rubber film and the sealing base are jacked up by water, so that the water inlet cavity is communicated with the pressure relief cavity, pressure relief is realized, and the water pressure in the pipeline is ensured to be at a safe value; when the water pressure in the water inlet cavity is smaller than the pressure of the reset spring, namely the threshold value of the safety valve, the rubber film and the sealing base are pressed on the channel openings of the water inlet cavity and the pressure relief cavity for sealing. The bowl-shaped rubber membrane in the pressure relief valve divides the pressure relief cavity into a drainage cavity and a valve cavity, so that the pressure relief valve is isolated from water, the corrosion of a water medium to the reset spring is prevented, and the sealing property of the safety valve is improved; and the manual mechanism adopts a mechanism which automatically resets after pressure relief, so that the leakage phenomenon caused by improper use of the safety valve is avoided. Before the safety valve leaves factory, the threshold value of the safety valve needs to be measured and adjusted to meet the technical requirements. Generally, the pressure relief device is adjusted by rotating an adjusting cap, the adjusting cap is connected to the pressure relief seat in a threaded mode, and the compression amount of the return spring can be changed by rotating the adjusting cap, so that the pressure of the return spring on the rubber film and the sealing base is changed. When the adjusting cap moves downwards, the return spring is further compressed, and the threshold value of the safety valve is increased; when the adjusting cap moves upwards, the return spring extends, and the threshold value of the safety valve is reduced.

In the manual pressure relief, automatic pressure relief and safety valve threshold value adjustment processes, the spring can all take place to stretch out and draw back, if the upper end of reset spring when the installation has taken place crooked and take place to contact with the screw hole of pressure relief seat, then reset spring upper end in flexible process can produce frictional wear with the pressure relief seat between, thereby influence reset spring's performance, make the safety valve threshold value change and influence the normal use of safety valve.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a relief valve, the technical problem of solution is how to improve the stability of relief valve long-term use.

The purpose of the utility model can be realized by the following technical proposal:

a safety valve comprises a valve body, a valve cavity is arranged in the valve body, an upper end opening of the valve cavity is fixedly connected with a valve cap, an elastic sealing seat is arranged between the valve cap and the valve body, a locking cap capable of moving up and down is connected with an internal thread of the valve cap, a valve rod capable of moving up and down is inserted in the locking cap, a water stop seat is fixed at the lower end of the valve rod, the water stop seat is fixedly connected with the sealing seat, a spring is sleeved outside the valve rod, the upper end of the spring is abutted against the locking cap, the lower end of the spring is abutted against the water stop seat, the sealing seat is abutted against the cavity wall of the valve cavity under the action of the spring and forms a seal, the safety valve is characterized in that a fixing hole is formed in the water stop seat, a convex baffle is arranged on the outer side face of the lower end of the valve rod, the lower end of the, be provided with on the hole wall of fixed orifices and keep off the shoulder, keep off protruding up end and support and lean on keeping off on the shoulder, the outer department of following of terminal surface has the annular that keeps off of downward convex under the lock cap, the interior department of following of terminal surface has the annular guide ring that supplies the valve rod to wear to establish of downward convex under the lock cap, terminal surface department is located to keep off and forms between ring and the guide ring and is annular constant head tank under the lock cap, the last pot head of spring is established on the guide ring and is embedded into in the constant head tank.

The protruding fixed orifices tight fit of keeping off with the stagnant water seat of valve rod is fixed, and keeps off protruding and keep off the shoulder and lean on, makes the lower extreme of valve rod and stagnant water seat fixed stable, can reduce rocking that the valve rod lower extreme takes place at the valve rod lift in-process, makes the valve rod stable in use, has improved the stability of relief valve long-term use. And when assembling, can fix into an organic whole with stagnant water seat and valve rod, make the equipment of relief valve convenient. The constant head tank has the positioning action, and the upper end of spring is embedded into the constant head tank after, can avoid the upper end of spring to take place crooked and with the pore wall contact of valve cap screw hole, avoids the spring to take place frictional wear and influence the use with the pore wall of valve cap screw hole, has improved the stability of relief valve long-term use.

In the safety valve, the lower end surface of the valve rod is provided with a convex column, the sealing seat is provided with a positioning hole, the convex column is inserted into the positioning hole, and the outer side surface of the convex column is tightly attached to the wall surface of the positioning hole. Therefore, the lower end of the valve rod is firmly fixed with the sealing seat, and the stability of the safety valve in long-term use is improved.

In the safety valve, the mounting ring is arranged on the cavity wall of the valve cavity, the outer edge of the sealing seat is fixed between the mounting ring and the valve cap, the sealing ring is arranged below the mounting ring on the cavity wall of the valve cavity, the sealing seat abuts against the upper end face of the sealing ring and forms sealing, the upper end face of the sealing ring and the outer side face of the sealing ring are in fillet transition, and the upper end face of the sealing ring and the inner side face of the sealing ring are in fillet transition. The structure of sealing ring can avoid sealing ring and seal receptacle to support to produce when leaning on and destroy the seal receptacle, guarantees the long-term use of seal receptacle, is favorable to improving the stability of relief valve long-term use.

In the safety valve, the outer edge of the water stop seat extends upwards to form a cylinder body, and the upper edge of the cylinder body is provided with an annular cylinder edge protruding outwards. The arrangement of the cylinder edge can improve the integral structural strength of the water stop seat, is favorable for long-term use of the water stop seat and is favorable for improving the stability of the safety valve in long-term use.

In the safety valve, the lower end face of the guide ring is provided with two convex blocks which are arranged in a protruding mode, the two convex blocks are arranged symmetrically, and the inner side faces of the convex blocks are matched with the outer side face of the valve rod. The convex block prolongs the guiding function of the guide ring, so that the valve rod slides stably up and down in the lock cap, and the stability of the safety valve in long-term use is improved.

In foretell relief valve, the cover is equipped with the hand wheel on the valve cap, be provided with the through-hole on the up end of hand wheel, be provided with the bulge loop on the hole wall of through-hole, be connected with the rand after the bulge loop is passed to the upper end of valve rod, the rand backstop is in the bulge loop, the top that lies in the valve rod in the through-hole is fixed with the closing cap of being made by plastics, convex insert the ring on the lower terminal surface of closing cap, convex fastening strip has on the lateral surface of inserting the ring, the fastening strip has the several and follows circumference evenly distributed, insert in the through-hole and fastening strip and through-hole tight fit fixed with the through-hole.

The closing cap has dustproof effect, prevents that impurity from entering into the valve chamber and producing influence to valve rod, spring, seal receptacle etc. guarantees the stability of relief valve long-term use. The setting up of fastening strip can reduce the possibility that the closing cap drops from the hand wheel naturally on the one hand, makes the dustproof effect of closing cap remain stable, and on the other hand makes the closing cap pull down from the hand wheel, makes the hand wheel pull down from the valve cap through pulling down the rand, just can adjust the lock cap after the hand wheel is pulled down to realize the adjustment of relief valve threshold value.

In the safety valve, a plurality of assembling grooves are formed in the upper end surface of the lock cap. The locking cap can be fixed with a special wrench through the assembling groove, so that the threshold value of the safety valve can be adjusted by conveniently rotating the locking cap.

Compared with the prior art, the utility model has the advantages of it is following:

set up on the lower terminal surface of lock cap and keep off ring, guide ring and constant head tank, in the constant head tank was embedded into to the upper end of spring, made the spring use stable, the valve rod lower extreme keeps off between protruding and the fixed orifices of stagnant water seat tight fit fixed, and keeps off protruding to lean on keeping off the shoulder, makes the valve rod use stable, has improved the stability of relief valve long-term use. The arrangement of the convex block on the guide ring not only increases the guide effect of the guide ring, enables the valve rod to slide stably, but also can reduce the material cost of the lock cap. The structure setting of closing cap on the hand wheel makes the closing cap both can not drop naturally, guarantees its dustproof effect, can artificially tear out again, carries out the regulation of relief valve threshold value through the lock cap, is favorable to the stability of relief valve long-term use. The sealing ring structure is arranged, so that the sealing seat can be used for a long time.

Drawings

FIG. 1 is a perspective view of the present safety valve;

FIG. 2 is a cross-sectional view of the present safety valve;

FIG. 3 is a disassembled perspective view of the present safety valve;

fig. 4 is a perspective view of a locking cap in the present safety valve.

In the figure, 1, a valve body; 1a, a valve cavity; 1b, a water inlet hole; 1c, water outlet holes; 1d, mounting a ring; 1e, a sealing ring; 2. a bonnet; 2a, lifting the block; 2b, lifting the surface; 3. a sealing seat; 3a, positioning holes; 3b, a bulge; 4. a lock cap; 4a, a baffle ring; 4b, a guide ring; 4c, positioning grooves; 4d, bumps; 4e, assembling a groove; 5. a valve stem; 5a, blocking protrusions; 5b, a convex column; 6. a water stopping seat; 6a, a cylinder body; 6b, a barrel edge; 6c, fixing holes; 6d, blocking shoulders; 7. a spring; 8. a hand wheel; 8a, a through hole; 8b, an annular groove; 8c, a convex ring; 8d, an abutting block; 8e, shoulder; 9. a collar; 10. sealing the cover; 10a, inserting a ring; 10b, fastening strips.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-4, a safety valve includes a valve body 1, avalve cavity 1a is provided in the valve body 1, a water inlet hole 1b communicated with thevalve cavity 1a is provided on a lower end surface of the valve body 1, and awater outlet hole 1c communicated with thevalve cavity 1a is provided on an outer side surface of the valve body 1. The upper end of thevalve cavity 1a is opened and fixedly connected with avalve cap 2, and anelastic sealing seat 3 is arranged between thevalve cap 2 and the valve body 1. The internal thread of thevalve cap 2 is connected with alocking cap 4 which can move up and down, avalve rod 5 which can move up and down is inserted into thelocking cap 4, the upper end of thevalve rod 5 extends out of thelocking cap 4, the lower end of thevalve rod 5 is fixed with awater stopping seat 6, and thewater stopping seat 6 is fixed with asealing seat 3.

The outer edge of thewater stopping seat 6 extends upwards to form acylinder body 6a, the upper edge of thecylinder body 6a is provided with anannular cylinder edge 6b protruding outwards, the center of thewater stopping seat 6 is provided with a fixing hole 6c, and the wall surface of the fixing hole 6c is provided with a retaining shoulder 6 d. The outer side face of the lower end of thevalve rod 5 is provided with aconvex blocking protrusion 5a, the lower end of thevalve rod 5 is arranged in the fixing hole 6c in a penetrating mode, the outer side face of the blockingprotrusion 5a is fixed with the hole wall face of the fixing hole 6c in a tight fit mode, the blockingprotrusion 5a is located below the blocking shoulder 6d, and the upper end face of the blockingprotrusion 5a abuts against the blocking shoulder 6 d. The central area of the sealingseat 3 is recessed downwards to form an abutting part, a connecting part is formed on the periphery of the abutting part, a convex mounting ring 1d is arranged on the cavity wall of thevalve cavity 1a, and the outer edge of the connecting part is fixed between the mounting ring 1d and thebonnet 2. Thewater stop seat 6 is positioned at the inner side of the connecting part and is fixed with the upper end surface of the abutting part, the outer side surface of the lower end of thecylinder body 6a is tightly abutted with the inner side surface of the lower end of the connecting part, and thecylinder edge 6b is positioned above the connecting part. The lower end face of thevalve rod 5 is provided with aconvex column 5b, the upper end face of the abutting portion is provided with apositioning hole 3a for theconvex column 5b to be inserted into, thepositioning hole 3a is a blind hole, theconvex column 5b is inserted into thepositioning hole 3a, and the outer side face of theconvex column 5b is tightly attached to the wall face of thepositioning hole 3 a. The lower end face of the abutting part is provided with aprotrusion 3b protruding downwards, and theprotrusion 3b is arranged opposite to thepositioning hole 3 a.

A sealing ring 1e is arranged below the mounting ring 1d on the cavity wall of thevalve cavity 1a, the upper end face of the sealing ring 1e and the outer side face of the sealing ring 1e are in round angle transition, and the upper end face of the sealing ring 1e and the inner side face of the sealing ring 1e are also in round angle transition. A water passage is arranged between the sealing ring 1e and the mounting ring 1d, and the inner end of thewater outlet hole 1c is connected with the water passage. Thevalve rod 5 is sleeved with a spring 7, the upper end of the spring 7 is abutted against thelock cap 4, the lower end of the spring 7 is positioned in thecylinder body 6a and is abutted against thewater stop seat 6, and the abutting part of the sealingseat 3 is abutted against the upper end surface of the sealing ring 1e under the action of the spring 7 to form sealing. The outer edge of the lower end face of thelock cap 4 is provided with a downward convexannular retaining ring 4a, the inner edge of the lower end face of thelock cap 4 is provided with a downward convexannular guide ring 4b for thevalve rod 5 to penetrate, the lower end face of thelock cap 4 is positioned between the retainingring 4a and theguide ring 4b to form anannular positioning groove 4c, and the upper end of the spring 7 is sleeved on theguide ring 4b and embedded into thepositioning groove 4 c. The lower extreme face ofguide ring 4b has thelug 4d of protrusion setting, andlug 4d has two and symmetry setting, and the medial surface oflug 4d cooperatees with the lateral surface ofvalve rod 5. The upper end surface of thelocking cap 4 is provided with a plurality of assemblinggrooves 4e, and the assemblinggrooves 4e are provided with two, three or four, preferably, four assemblinggrooves 4e are uniformly distributed along the circumferential direction. The inner side portions of the fourfitting grooves 4e are connected, and the bottom surfaces of thefitting grooves 4e are inclined inward.

The upper end of thevalve cap 2 is sleeved with ahand wheel 8, the upper end face of thehand wheel 8 is provided with a throughhole 8a, the lower end face of thehand wheel 8 is provided with anannular groove 8b, and theannular groove 8b is positioned on the outer side of the throughhole 8 a. Be provided withbulge loop 8c on the hole wall of through-hole 8a, the joint hasdetachable rand 9 behindbulge loop 8c is passed to the upper end ofvalve rod 5, andrand 9 backstop is inbulge loop 8 c. The upper end face of thevalve cap 2 is circumferentially provided with a plurality of liftingblocks 2a, the upper end face of each liftingblock 2a is a liftingface 2b which is spirally inclined, and the number of thelifting blocks 2a is two, three or four. Thelifting block 2a is embedded into theannular groove 8b, the bottom surface of theannular groove 8b is provided with aprotruding abutting block 8d which is in one-to-one correspondence with thelifting block 2a, and theabutting block 8d abuts against the liftingsurface 2 b. When rotating thehand wheel 8, make 8 upward movements of hand wheel throughlifting piece 2a, drivevalve rod 5 upward movement throughbulge loop 8c andrand 9, can make the portion of supporting on theseal receptacle 3 break away from sealing ring 1e, make inlet opening 1b and apopore 1c intercommunication. A sealingcover 10 made of plastic is fixed in the throughhole 8a above thevalve rod 5, aconvex shoulder 8e is arranged on the hole wall surface at the upper end of the throughhole 8a, the sealingcover 10 is arranged in the throughhole 8a, and the outer edge of the sealingcover 10 abuts against the upper end surface of theconvex shoulder 8 e. The lower end face of thecover 10 is provided with a convex insertingring 10a, the outer side face of the insertingring 10a is provided with convex fastening strips 10b, the fastening strips 10b are provided with a plurality of fastening strips and are uniformly distributed along the circumferential direction, the fastening strips 10b are provided with two, three, four or more than four, preferably, the fastening strips 10b are provided with four, the insertingring 10a is inserted into the throughhole 8a, and the fastening strips 10b are tightly matched and fixed with the throughhole 8 a.

During manual pressure release, rotatehand wheel 8 and promotevalve rod 5, spring 7 takes place to shrink, and the portion of leaning on ofseal receptacle 3 leaves sealing ring 1e, and inlet opening 1b and apopore 1c intercommunication realize manual pressure release. After thehand wheel 8 is released, the spring 7 extends, thevalve rod 5 descends under the action of the spring 7, the sealingseat 3 is abutted against the sealing ring 1e again, and the water inlet hole 1b is separated from thewater outlet hole 1c and is in a state of automatic pressure relief. When the water pressure is higher than the pressure of the spring 7, the sealingseat 3 is flushed by water flow, the spring 7 is compressed, and thevalve rod 5 is lifted to communicate the water inlet hole 1b with thewater outlet hole 1c for pressure relief; when the water pressure is lower than the pressure of the spring 7, the spring 7 extends, thevalve rod 5 descends, and the sealingseat 3 abuts against the sealing ring 1e for sealing. When the threshold value of the safety valve needs to be adjusted, the lockingcap 4 is rotated to extend or compress the spring 7 so as to adjust the pressure of the spring 7 on the sealingseat 3. During the manual pressure relief and the automatic pressure relief, thevalve rod 5 slides up and down. The protruding 5a of fender ofvalve rod 5 is fixed with the fixed orifices 6c tight fit ofstagnant water seat 6, and keeps off protruding 5a and keeps off shoulder 6d and lean on, makes the lower extreme ofvalve rod 5 andstagnant water seat 6 fixed stable, can reduce the in-process emergence ofvalve rod 5 lower extreme at the lift of valve rod and rock, makesvalve rod 5 stable in use, has improved the stability of relief valve long-term use. And when assembling, thewater stop seat 6 and thevalve rod 5 can be fixed into a whole, so that the safety valve is convenient to assemble. During manual pressure relief, automatic pressure relief and safety valve threshold adjustment, the spring 7 will expand and contract.Constant head tank 4c has the positioning action, and spring 7's upper end is embedded into behind theconstant head tank 4c, can avoid spring 7's upper end to take place crooked and with the wall contact ofvalve cap 2 screw hole, avoid spring 7 and the wall ofvalve cap 2 screw hole to take place frictional wear and influence the use, improved the stability of relief valve long-term use.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (7)

1. The safety valve comprises a valve body (1), a valve cavity (1a) is arranged in the valve body (1), an upper end opening of the valve cavity (1a) is fixedly connected with a valve cap (2), an elastic sealing seat (3) is arranged between the valve cap (2) and the valve body (1), a locking cap (4) capable of moving up and down is connected with the valve cap (2) in an internal thread manner, a valve rod (5) capable of moving up and down is inserted in the locking cap (4), a water stopping seat (6) is fixed at the lower end of the valve rod (5), the water stopping seat (6) is fixedly connected with the sealing seat (3), a spring (7) is sleeved outside the valve rod (5), the upper end of the spring (7) is abutted against the locking cap (4), the lower end of the spring (7) is abutted against the water stopping seat (6), the sealing seat (3) is abutted against the cavity wall of the valve cavity (1a) and forms a seal under the action of, the water stop valve is characterized in that a fixing hole (6c) is formed in the water stop seat (6), a convex blocking protrusion (5a) is arranged on the outer side face of the lower end of the valve rod (5), the lower end of the valve rod (5) penetrates through the fixing hole (6c), the outer side face of the blocking protrusion (5a) is tightly matched and fixed with the hole wall face of the fixing hole (6c), a blocking shoulder (6d) is arranged on the hole wall face of the fixing hole (6c), the upper end face of the blocking protrusion (5a) abuts against the blocking shoulder (6d), an annular blocking ring (4a) protruding downwards is arranged at the outer edge of the lower end face of the lock cap (4), a guide ring (4b) protruding downwards and allowing the valve rod (5) to penetrate through is arranged at the inner edge of the lower end face of the lock cap (4), and an annular positioning groove (4c) is formed between the blocking ring (4a) and the guide ring (4b) at the lower end face of the lock cap (4), the upper end of the spring (7) is sleeved on the guide ring (4b) and embedded into the positioning groove (4 c).

2. The safety valve according to claim 1, characterized in that the lower end surface of the valve rod (5) is provided with a convex post (5b), the sealing seat (3) is provided with a positioning hole (3a), the post (5b) is inserted into the positioning hole (3a), and the outer side surface of the post (5b) is tightly attached to the wall surface of the positioning hole (3 a).

3. Safety valve according to claim 1 or 2, characterized in that the valve chamber (1a) has a mounting ring (1d) on its wall, the outer edge of the sealing seat (3) is fixed between the mounting ring (1d) and the bonnet (2), a sealing ring (1e) is provided on the wall of the valve chamber (1a) below the mounting ring (1d), the sealing seat (3) abuts against the upper end face of the sealing ring (1e) and forms a seal, the upper end face of the sealing ring (1e) and the outer side face of the sealing ring (1e) are in round transition, and the upper end face of the sealing ring (1e) and the inner side face of the sealing ring (1e) are in round transition.

4. The safety valve according to claim 1 or 2, characterized in that the outer edge of the water stop seat (6) extends upwards to form a cylinder body (6a), and the upper edge of the cylinder body (6a) is provided with an annular cylinder edge (6b) protruding outwards.

5. Safety valve according to claim 1 or 2, characterized in that the lower end face of the guide ring (4b) has a protruding projection (4d), said projections (4d) being arranged symmetrically and in two, the inner side of said projection (4d) cooperating with the outer side of the valve stem (5).

6. Safety valve according to claim 1 or 2, characterized in that a handwheel (8) is fitted over the upper end of the bonnet (2), a through hole (8a) is arranged on the upper end surface of the hand wheel (8), a convex ring (8c) is arranged on the hole wall surface of the through hole (8a), the upper end of the valve rod (5) is connected with a clamping ring (9) after passing through the convex ring (8c), the clamping ring (9) is stopped by the convex ring (8c), a sealing cover (10) made of plastic is fixed above the valve rod (5) in the through hole (8a), the lower end face of the sealing cover (10) is provided with a convex inserting ring (10a), the outer side face of the inserting ring (10a) is provided with a convex fastening strip (10b), fastening strip (10b) have the several and along circumference evenly distributed, insert ring (10a) and insert in through-hole (8a) and fastening strip (10b) and through-hole (8a) tight fit are fixed.

7. Safety valve according to claim 1 or 2, characterized in that the locking cap (4) is provided with several fitting grooves (4e) on its upper end face.

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