CN208519492U - Multi-faceted installing type steam trap - Google Patents

Abstract

A kind of multi-faceted installing type steam trap disclosed by the utility model, it is desirable to provide without architectural limitation, volume small displacement is big, can provide the drain valve of multiple mounting modes.The utility model is achieved by the following technical programs: valve deck is used with horizontal inlet channel and the valve body for having vertical outlet passage, valve deck removably connects firmly the input end in valve body, working media is flowed into from valve deck access road, and the exit passageway from valve body perpendicular to access road flows out；Valve deck docks the 90 ° of elbow medium flow channels to form valve chamber and its be arranged in the valve chamber by the stud nut on valve flange disk, blind hole outlet cylinder vertical outlet passage, the back pressure separate cavities connection tailstock blanking cover being connected on the right side of vertical outlet passage by media storage chamber are connect by valve chamber；One flap with valve rod protrudes into tailstock blanking cover composition differential pressure component by vertical outlet passage radial opening valve and its bowl-type slip ring being arranged in media storage cavity.

Description

Multi-faceted installing type steam trap

Technical field

The high middle pressure steam such as petroleum, chemical industry, printing and dyeing, pharmacy, weaving, food is widely used in the utility model relates to one kind to set The steam trap of standby system, in particular for using in equipment, automatic-discharging condensed water and not coagulated from jet chimney and steam The valve of knot property gas, relates generally to the steam trap of high pressure, huge discharge.

Background technique

Steam trap is as the use equipment in industrial production vapour system, for guaranteeing safety, the section of technical process It can, efficiently run and play a very important role.Drain valve is for that can be automatically drained out condensation in steam pipe network and equipment Water, air and other incondensable gases, and the valve for the vapour leakage that blocks water.The basic role of drain valve is will be in vapour system Condensed water, air and carbon dioxide gas are discharged as early as possible；It is automatically prevented from the leakage of steam to the maximum extent simultaneously.The product of drain valve There are many kind, the performance having nothing in common with each other.In steam pipeline, steam uses equipment, institute in the technical process such as steam tracing pipeline The condensed water of generation, it is necessary to exclude as early as possible, otherwise, the condensed water of swiftly flowing Steam Actuation product knot together makes to condense For water in tube wall and valve and steam using strong shock is carried out in equipment, the impact force of generation is often very big, this existing As referred to as water attack.When water attack is very strong, will cause at pipeline turning and valve damage or destruction.Condensed water accumulates in equipment simultaneously Consequence that is interior to largely effect on heat exchange efficiency, or even causing heating process that can not carry out.And the effect of steam trap is exactly certainly Dynamic condensed water, air and the other non-condensable gas for excluding constantly to generate in jet chimney and equipment, while preventing to steam again Vapour evolution, it is a kind of energy-conserving product for guaranteeing various steaming plant devices and effectively running.

Drain valve wants energy " identification " steam and condensed water, can just play the role of block steam and drain water." identification " steam and condensed water Based on three principles: density contrast, temperature difference and phase transformation.There are many pattern of drain valve, by the difference of working principle, according to three originals Reason produces the drain valve of three types.Drain valve is classified as mechanical type, heat static force type, heat power type.Wherein, mechanical type is hydrophobic Valve is defended the variation of height and is acted by condensation aqueous in steam trap, realizes valve using the height of condensed water liquid level Opening and closing, mechanical type drain valve includes: float-ball type: float is closed hollow ball.Its degree of supercooling is small, not by operating pressure With the influence of temperature change, there is water to arrange, water is not stored in heating equipment, displacement is big.Belonging to such drain valve has Inversion type and float-ball type etc..Heat static force type drain valve has bellows-type, bellows-type, double-metal sheet type.Bellows-type, bellows-type are quick Sensing unit is bellows or print cartridge, and inside is filled with volatile liquid, and double-metal sheet type sensing element is bimetal leaf.Heat static force type Drain valve is acted by the variation of fluid temperature, and the modification or expansion of temperature-sensing element are caused using the temperature difference of steam and condensed water Drive valve core opening/shutting valve.Heat static force type drain valve acts, its degree of supercooling by the variation of the thermodynamic property of liquid It is bigger, there is condensed water in high temperature before valve always, displacement is small.Flow velocity when heat power type steam trap passes through by steam and condensed water With the difference of volume change, valve metal film is made to generate different pressure differences up and down, drives valve metal film controlled valve.Hot power is hydrophobic Valve arrangement is simple, resistance to water attack, discharge capacity are small.Belong to such drain valve, abacus formula, pulsed etc..

Heat static force type drain valve and heat power type steam trap are all only applicable to the operating condition of small displacement, it is desirable that displacement is in 30T/ The operating condition of h or more, all selection lever floating ball type draining valve.The structure of lever float ball type steam drain valve is to utilize lever principle, An intermediate fulcrum, one end is by the pressure of the different generation of pressure inside and outside apopore, and the other end is by floating ball in condensed water The buoyancy of middle generation.The differential pressure that the prior art uses answer valve inverted bucket steam trap, is utilize condensed water and steam close The working principle of difference is spent, internal structure is that reverse bucket is connected by lever system, and reverse bucket is the liquid level for overcoming steam pressure switch Sensing element.The unlatching of usual drain valve valve needs to meet following formula, the pressure at area × apopore of apopore × lever one end to fulcrum length < (buoyancy-floating ball gravity of floating ball) × lever other end to fulcrum length.From upper Face formula is it is found that will make valve opening, then the buoyancy of floating ball has to be larger than the gravity of floating ball.Which limits the wall thickness of floating ball not The unconfined increase of energy, i.e. floating ball bearing capacity are limited, then the maximum working pressure of lever float ball type steam drain valve is limited System.Keep valve displacement big, then it is necessarily big to be discharged hole area.This requires the volume of floating ball is big, and lever is to fulcrum Length to grow, this causes the volume of lever floating ball type draining valve all very big.

Under normal circumstances, drain valve is all mounted in the position lower than condensed water device for transferring.However, if it is desired to by hydrophobic Valve is mounted on higher than in place of condensed water device for transferring, then need to install the connector that rises in the front of drain valve, can just make to condense water energy It is enough successfully to flow into drain valve.The connector that rises is alternatively referred to as " suction connector ".Whether drain valve installation is suitable, just to drain valve Often the production efficiency of work and equipment, which has, directly has an impact.Installing drain valve must be flowed to by regular installation requirement, condensed water Arrow mark to be installed consistent with drain valve, just drain valve and equipment can be made to reach optimum working efficiency.Mechanical type drain valve is wanted It is horizontally mounted.Steam trap cannot be installed in series, and one meter or more uninsulated supercooling tube is needed before heat static force type drain valve, Other forms drain valve will be as close as possible to equipment.Lever float ball type steam drain valve belongs to mechanical drain valve, is according to floating ball The difference of the buoyancy of generation and gravity is turned on or off valve, and gravity is that vertically downward, floating ball is that vertically upward, this is just Result in the mounting means of steam trap product be it is fixed, to meet different mounting means, must develop and remove installation side Formula different outer consistent a variety of similar products of other performance meet duty requirements.

Utility model content

The purpose of this utility model in view of the deficiencies of the prior art mentioned above, provides a kind of mounting means flexibility and changeability, Body is small and discharge capacity is big, and operating pressure is high, is capable of the multi-faceted installing type steam trap of multi-faceted installation.

The purpose of this utility model can be reached by the following measures.The multi-faceted installing type steam trap of kind, comprising: Sealing is fixed on the valve body between tailstock blanking cover and bonnet flange disk, and is allowed to the sealed pressure vessel to be formed, and feature exists In valve deck is used with horizontal inlet channel and the valve body for having vertical outlet passage, and valve deck is removably connected firmly in valve body Input end, working media are flowed into from valve deck access road, and the exit passageway from valve body perpendicular to access road flows out；Valve deck passes through Stud nut on valve flange disk docks the 90 ° of elbow medium flow channels to form valve chamber and its be arranged in the valve chamber, valve Blind hole outlet cylinder vertical outlet passage, the back pressure separate cavities being connected on the right side of vertical outlet passage by media storage chamber are connect by chamber Connect tailstock blanking cover；One flap with valve rod is by vertical outlet passage radial opening valve and its is arranged in media storage Bowl-type slip ring in cavity protrudes into tailstock blanking cover composition differential pressure component.

The utility model technology has the advantages that compared with prior art

1. mounting means flexibility and changeability.The utility model uses the valve deck 1 with horizontal inlet channel vertical with having out The valve body in mouthful channel, thus reach valve can make up it is left into it is lower go out, it is left into it is upper go out, a left side go out into side, it is right into it is lower go out, it is right into upper Out, the right side goes out into side, the enterprising right side goes out, an enterprising left side goes out, a variety of connection types of enterprising side out, and this multiple mounting modes pass through by pressing Power difference carrys out the opening and closing of control valve, does not influence being turned on or off for valve by gravity, meets various differences Operating condition is installed and used.Regular installation, the ability of arrow mark must be flowed to by a condensed water by avoiding prior art drain valve Drain valve and equipment can be made to reach the limitation of optimum working efficiency, and the connector that rises, ability need to be installed in the front of drain valve Condensed water is set successfully to flow into the limitation of drain valve.

2. displacement is big.The utility model uses the flap 15 with valve rod, and the flap of valve rod passes through vertical outlet passage The spring base and its rear connect cylinder set 14 of radial opening valve setting, protrude into 9 tailstock of tailstock blanking cover composition differential pressure component, circular cone flap Reversed to seal vertical outlet passage radial opening valve and generate pressure difference, main valve is opened and obtains huge discharge, and bowl-type slip ring 13 leans on Nearly 9 end face of tailstock blanking cover is by the pressure medium introduced from medium shunt hole 18, and bowl-type slip ring 13 is close to 9 end face of tailstock blanking cover The entrance latus rectum of area ratio valve is big, and the open area of flap 15 is smaller than valve inlet drift diameter area, to enable condensed water Successfully flow into drain valve.Not only operating pressure is high, and discharge capacity is big, and flow of media channel is similar to 90 ° of elbows, opens Flow resistance after opening is small, this just ensure that displacement is big from structure.Water when can prevent steam from stopping in gutter is countercurrently to thin Water valve and break down, to the yield strong applicability of condensed water, can intermittent drainage, gas-water separation is reliable

3. operating pressure is high.The utility model passes through vertical outlet passage radial direction using a flap 15 with valve rod Be open the spring base and its rear connect cylinder set 14 that valve is arranged, and 9 tailstock of tailstock blanking cover composition differential pressure component is protruded into, after flap 15 Side connects firmly bowl-type slip ring 13, and bowl-type slip ring 13 connects firmly on 15 valve rod of flap, and together by being mounted in cylinder set 14, along cylinder set Inner wall sliding, flap 15 is for linear motion along axial line in horizontal inlet channel entrance high-pressure, and in 15 spring base of flap Compressed spring 12 and its with vertical outlet passage export, be radially directed towards back pressure separate cavities 17 medium shunt hole 18 act under, Pressure difference is constituted by flap and the area discrepancy of bowl-type slip ring stress, born pressure can be mutually transmitted, according to both ends institute By the difference of pressure, allows bowl-type slip ring 13 and flap 15 to connect firmly body and slided in cylinder set 14, by pressure difference opening come control valve It opens and closes, do not influence being turned on or off for valve by gravity, structure can bear high pressure, overcome existing The restricted problem of the maximum working pressure of technology lever float ball type steam drain valve can be applied to high pressure operating condition well.

4. small in size.The utility model is fixed on the valve body 2 between tailstock blanking cover 9 and valve deck 1 using sealing, and is allowed to The sealed pressure vessel of formation, structure is extremely compact, and working media is flowed into from 1 entrance of valve deck, flows out from valve body 2, flows through channel Similar to 90 ° of elbows, only one intermediate flap 15 is compared to the lever and floating of huge discharge without other any mechanisms The volume of formula drain valve is more able to satisfy compact installation space with regard to much smaller.

The problem of requiring pressure high in conclusion the utility model solves, and requiring discharge capacity big operating condition.This is practical new Type also overcome mechanical drain valve can only have a kind of the shortcomings that mounting means can there are many multiplicity mounting means.

Detailed description of the invention

In order to be further described rather than the above-mentioned implementation of the utility model patent is limited, with reference to the accompanying drawing to this Utility model patent is described further, but therefore the utility model patent is not limited among the range.It is all These designs should be regarded as the utility model patent disclosure of that and protection scope.

Fig. 1 is the multi-faceted installing type steam trap of the utility model.

Fig. 2 is the cross-sectional view of Fig. 1.

In figure: 1 valve deck, 2 valve bodies set axle sleeve, 4T shape air bleeder valve, 5 glands, 6 valve metal films, 7 cappings, 8 sealings before 3 Pad, 9 tailstock blanking covers, 10 valve stem sleeves, 11 nuts, 12 compressed springs, 13 bowl-type slip rings, 14 sets, 15 flaps, 16 stud spiral shells Mother, 17 back pressure separate cavities, 18 medium shunt holes, 19 blind holes export cylinder.

Specific embodiment

Refering to fig. 1, Fig. 2.In the embodiment described below, a kind of multi-faceted installing type steam trap, comprising: sealing The valve body 2 being fixed between tailstock blanking cover 9 and valve deck 1, and it is allowed to the sealed pressure vessel to be formed.With horizontal inlet channel Valve deck 1 90 ° of elbow medium flow channels for forming valve chamber and its formation are docked by the stud nut 16 on 2 ring flange of valve body, Blind hole outlet cylinder vertical outlet passage, the back pressure isolation being connected on the right side of vertical outlet passage by media storage chamber are connect by valve chamber Chamber 17 connects tailstock blanking cover 9；One flap 15 with valve rod is existed by vertical outlet passage radial opening valve and its setting Bowl-type slip ring 13 in media storage cavity protrudes into tailstock blanking cover 9 and forms differential pressure component, and 15 valve rod of flap is in horizontal inlet channel It is for linear motion along axial line under the action of high-pressure, and in 15 valve rod compressed spring 12 of flap and its vertical with flange plate Exit passageway outlet is radially directed towards under the effect of medium shunt hole 18 of back pressure separate cavities 17, passes through flap 15 and bowl-type slip ring 13 Forced area difference and the pressure difference generated control the open and close of vertical outlet passage radial opening valve.Valve deck 1 is removable Ground connects firmly the input end in valve body 2, and working media is flowed into from 1 entrance of valve deck, from valve body 2 perpendicular to the outlet of above-mentioned access road Channel outflow.

The T shape air bleeder valve 4 of runner built in a communication seals pressure vessel is fixedly connected on the upside of 2 tail portion shell of valve body, The valve metal film that can be freely moved 6, valve metal film 6 are filled between 5 inner cavity lower projection of T shape air bleeder valve 4 and gland 5 inner cavity boss of gland is fixed on the end of T shape air bleeder valve 4 on annular groove, the steam vapour that being formed prevents air gas stifled is locked.It steams Vapour vapour is locked to be sealed by 7 spiral shell of capping of 2 shell of valve body.The end of T shape air bleeder valve 5 is formed with slanted channel to annular groove, and slanted channel is logical Cross 2 medium channel of valve body connection back pressure separate cavities 17.

The tail end of valve body 2 is fixedly connected with the tailstock blanking cover 9 for having blind hole cylinder, and blind hole wound packages is equipped with dynamic cooperation flap connecting rod Valve stem sleeve 10,9 inner side end center stepped hole of tailstock blanking cover is equipped with axial connection the rear of valve stem sleeve 10 and sets axle sleeve.? The component similar to 90 ° of elbow, the component are formed in the sealed pressure vessel formed between 1 import of valve body 2 and valve deck On be formed with extend radially out 2 shell of valve body blind hole outlet cylinder, blind hole outlet cylinder radial direction be formed with switch flap 15 in Axle sleeve 3 is set before the conical hole and assembly flap Step Shaft of centrum, side passes through 2 tail portion port of valve body in the blind hole Exported Cone body The valve deck 1 connected firmly forms the media storage chamber of sealed pressure vessel storage medium, and media storage cavity and blind hole export cylinder It is connected, forms a medium side stream passages parallel with upper part inner wall with the sealed pressure vessel inner wall.Medium Side runner tail portion is equipped with bowl-type slip ring 13, and the spring base of assembly compressed spring 12, pressure are formed in the middle part of the bowl body of bowl-type slip ring 13 Contracting spring 12 be assemblied in spring base and before set between 3 cylinder of axle sleeve, 13, bowl-type slip ring set 14 excircle on be formed with slip ring.With The valve rod that flap 15 is connected sequentially passes through blind hole outlet cylinder switch hole, preceding sets axle sleeve 3, connection bowl-type slip ring 13 rear end Axle sleeve is set afterwards and its valve stem sleeve 10 is fixed in the blind hole cylinder for stretching out 9 end face outside of tailstock blanking cover, under fluid media (medium) effect It is for linear motion along its axial line.Compressed spring 12 provides the predetermined value of a control 15 valve rod closing forces of flap.

Bowl-type slip ring 13 is assemblied in the rear end of cylinder set 14, is formed at least three annular grooves, center on the circumference of bowl-type slip ring 13 It is formed with the through-hole of assembly 15 valve rod of flap, valve rod sets axle sleeve 3, valve before sequentially passing through the assembly of vertical outlet passage radial opening 13 central through hole of bowl-type slip ring, 13 backside of bowl-type slip ring connected nut 11 and valve stem sleeve 10, composition one set axis before passing through Set 3,13 spring base central boss of valve bowl-type slip ring are set with compressed spring 12, move in a straight line in the axial direction in cylinder set 14 Component.

Bowl-type slip ring 13 is close to 9 end face of tailstock blanking cover by the pressure medium introduced from medium shunt hole 18, bowl-type slip ring 13 close to the area ratio valve of 9 end face of tailstock blanking cover entrance latus rectum it is big, the open area of flap 15 is than valve inlet latus rectum face Product is small.

Storage medium enters T shape air bleeder valve 4 along the medium side stream passages of 90 ° of elbows of vertical outlet passage sealing end Axial passage drives the valve metal film 6 covered thereon, covers it in T shape air bleeder valve 4 and gland 5 and moves between space, To turn on or off the axially extending bore of T shape air bleeder valve 4, control enters the medium of back pressure separate cavities 17 from slanted channel Flow.

Cylinder 14 external cylindrical surfaces of set are formed with the necking down for being directed toward 13 backside gap of bowl-type slip ring, are formed by the connection of necking down slot and are directed toward 13 backside gap of bowl-type slip ring is largely stored in the medium in the valve chamber that valve body 2 and valve deck 1 are formed through vertical outlet passage radial direction Medium shunt hole 18 flows into the cavity of the back pressure separate cavities 17 of bowl-type slip ring 13 and the formation of 9 end face of tailstock blanking cover, in medium Under effect, 15 valve rod of flap is moved with bowl-type slip ring 13 along 3 axis direction of axle sleeve is preceding set, while storage medium is from 15 valve of flap Aperture flows into 2 vertical outlet passage of valve body.

It is to be provided to the engineers and technicians for being familiar with the utility model field to the utility model and its embodiment party above The description of case, these descriptions should be considered to be illustrative and not restrictive.Engineers and technicians utility model can weigh accordingly Thought in sharp claim is done specific operation and is implemented, in the spirit for not departing from the utility model that appended claims define and Under the premise of range, it can be made a variety of changes in the form and details.Above-mentioned these are regarded as the utility model Coverage.

Claims (10)

1. a kind of multi-faceted installing type steam trap, comprising: sealing be fixed on tailstock blanking cover (9) and valve deck (1) ring flange it Between valve body (2), and be allowed to the sealed pressure vessel to be formed, which is characterized in that valve deck (1) is using having horizontal inlet channel With the valve body (2) for having vertical outlet passage, valve deck (1) removably connects firmly the input end in valve body (2), and working media is from valve It builds (1) access road to flow into, the exit passageway from valve body (2) perpendicular to access road flows out；Valve deck (1) passes through valve body (2) method Stud nut (16) on blue disk docks the 90 ° of elbow medium flow channels for forming valve chamber and its being arranged in the valve chamber, valve chamber Side connects blind hole outlet cylinder vertical outlet passage, the back pressure separate cavities being connected on the right side of vertical outlet passage by media storage chamber (17) tailstock blanking cover (9) are connected；One flap (15) with valve rod is by vertical outlet passage radial opening valve and its sets The bowl-type slip ring (13) in media storage cavity is set, tailstock blanking cover (9) composition differential pressure component is protruded into.

2. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: valve body (2) tail portion shell Upside is fixedly connected with the T shape air bleeder valve (4) of runner built in a communication seals pressure vessel, T shape air bleeder valve (4) with The valve metal film that can be freely moved (6) is filled between the lower projection of gland (5) inner cavity, valve metal film (6) is fixed on gland (5) The end of inner cavity boss and T shape air bleeder valve (4) forms the steam vapour lock for preventing air gas stifled on annular groove, and steam vapour locks quilt Capping (7) spiral shell of valve body (2) shell seals.

3. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: in valve body (2) and valve deck (1) it is formed with the bent member similar to one 90 ° in the sealed pressure vessel formed between import, is formed on the bent member The blind hole outlet cylinder of valve body (2) shell is extended radially out, the radial direction of blind hole outlet cylinder is formed with switch flap (15) interior vertebra Axle sleeve (3) are set before the conical hole and assembly valve rod central stepped axis of body.

4. a kind of multi-faceted installing type steam trap as claimed in claim 3, it is characterised in that: the blind hole exports cylinder Inside forms the media storage chamber of sealed pressure vessel storage medium by the valve deck (1) that valve body (2) tail portion port connects firmly, and is situated between Matter stores cavity and is connected with blind hole outlet cylinder, forms one and upper part inner wall with the sealed pressure vessel inner wall Parallel medium side stream passages.

5. a kind of multi-faceted installing type steam trap as described in claim 3 or 4, it is characterised in that: storage medium along Medium side stream passages on 90 ° of elbow faces of vertical outlet passage sealing end enter T shape air bleeder valve (4) axial passage, driving The valve metal film (6) covered thereon makes its valve metal film (6) between T shape air bleeder valve (4) and gland (5) capping space Movement, to turn on or off the axially extending bore of T shape air bleeder valve (4), control enters back pressure separate cavities from slanted channel (17) rate-of flow.

6. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: bowl-type slip ring (13) assembly At least three annular grooves are formed on the rear end of cylinder set (14), the circumference of bowl-type slip ring (13), center is formed with assembly flap (15) valve The through-hole of bar, valve rod set axle sleeve (3), in valve bowl-type slip ring (13) before sequentially passing through the assembly of vertical outlet passage radial opening Heart through-hole, bowl-type slip ring (13) backside connected nut (11) and valve stem sleeve (10), form one pass through before set axle sleeve (3), The compressed spring (12) being set between valve bowl-type slip ring (13) centering spring seat does straight line in cylinder set (14) in the axial direction The component of movement.

7. a kind of multi-faceted installing type steam trap as claimed in claim 6, it is characterised in that: compressed spring (12) provides The predetermined value of one control flap (15) valve rod closing forces.

8. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: the tail end of valve body (2) is solid It is associated with the tailstock blanking cover (9) for having blind hole cylinder, valve stem sleeve (10) of the blind hole wound packages equipped with dynamic cooperation flap connecting rod, tailstock Blanking cover (9) inner side end center stepped hole is equipped with axial connection the rear of valve stem sleeve (10) and sets axle sleeve.

9. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: side medium flow channel tail dress Equipped with bowl-type slip ring (13), the spring base of assembly compressed spring (12), compressed spring are formed in the middle part of the bowl body of bowl-type slip ring (13) (12) be assemblied in spring base and before set between axle sleeve (3) cylinder, be formed with slip ring on the excircle of bowl-type slip ring (13) cylinder set (14).

10. a kind of multi-faceted installing type steam trap as described in claim 1, it is characterised in that: be linked to be with flap (15) One valve rod sequentially pass through blind hole outlet cylinder switch hole, it is preceding set axle sleeve (3), connection the rear of bowl-type slip ring (13) rear end set axis Set and its valve stem sleeve (10) are fixed in the blind hole cylinder for stretching out tailstock blanking cover (9) end face outside, act on lower edge in fluid media (medium) Its axial line is for linear motion；Flap (15) and its valve rod are for linear motion under the action of the high-pressure of horizontal inlet channel, And in flap (15) valve rod compressed spring (12) and its under being radially directed towards medium shunt hole (18) effect of back pressure separate cavities (17), The pressure difference generated by flap (15) forced area difference different from bowl-type slip ring (13), control vertical outlet passage are radially opened The open and close of mouth valve.