CN206338454U - A kind of pressure limiting device of purifier pressure pot - Google Patents

Abstract

The utility model discloses a kind of pressure limiting device of purifier pressure pot, including valve seat, valve seat is fixed at the opening of pressure pot；Valve element, is sheathed on valve base inner wall, and valve element includes plug and the plug for closing inner joint, and the plug is provided with outer junction towards external tapping, and the plug is provided with interior junction towards inner joint, and the outer junction area is more than interior junction area；Inner joint is set to be in the dynamic clamping head and quiet clamping head of normally open；The fluid passage passed through for fluid is offered inside valve element or valve seat；Seal is equipped with the joint gap of the opening of valve element, valve seat and staving.When the water in pressure pot is filled it up with, the valve element of pressure limiting device closes water inlet, continues to increase so as to limit pressure in bucket, prevents that pressure pot from bursting, the wall thickness needed for reduction pressure pot production, reduction pressure pot weight and material consumption.

Description

A kind of pressure limiting device of purifier pressure pot

Technical field

The utility model is related to the pressure pot in purifier, and in particular to a kind of pressure limiting dress of purifier pressure pot Put.

Background technology

Operationally, current pass through reverse osmosis membrane to water purifier, filter out trickle harmful impurity therein：Bacterium, virus, Radioactive substance and heavy metal, organic compound etc..

From the point of view of water purifier principle, only pure water just can will be left out and be discharged by reverse osmosis membrane, impurity. Because purifier water outlet amount is too small, it is impossible to meet the requirement that user fetches water at any time, thus when user does not fetch water, pure water Machine it is the same work, obtained pure water is first stored in pressure pot, when user needs to use water, directly from pressure pot to Outside is exported, and user need not just take time to wait water processed.Water purifier pressure pot serves the effect of equilibrium water amount and pressure, keeps away Exempt from safety valve frequently to open and the frequent moisturizing of automatic water compensating valve.

Pressure pot point plastic pressure bucket, carbon steel pressure bucket etc. from material.Existing pressure pot is generally by staving, air bag, water Mouth, valve inside etc. are constituted.During empty barrel, intracapsular pressure is about 0.5kg or so.After pure water is slowly injected in bucket, air in air bag Compressed, air pressure also gradually rises, until gasbag pressure reaches that water purifier high-voltage switch gear sets pressure, machine down.Work as pure water After tap is opened, the pure water being stored in pressure pot can be extruded by the air pressure in air bag.

When extraneous pipeline fills water into bucket, because hydraulic pressure gradually increases, air pressure also rises therewith, and hydraulic pressure is gentle The pressure of pressure is equal all the time, and two will be formed if the high-voltage switch gear of Pressured water tank front end breaks down, in pressure pot solely The vertical gentle higher-pressure region in water higher-pressure region, easily explosion, gases at high pressure and liquid produce great punching in the moment of pressure drum rupture Power is hit, there is certain threat to personal safety.

Therefore in the selection of pressure pot, water purifier manufacturer can do two kinds of selections：

1. the metal pressure pot of selection, such as carbon steel pressure bucket, it is difficult explosion, but weight is big, high cost, processing Difficulty is also high；

2. the plastic pressure pot of selection, processing is relatively simple, but requires that its wall thickness is larger, pressure pot is born More than 8kg hydraulic pressure, therefore required material is more, causes weight larger.

Utility model content

Goal of the invention of the present utility model is to be set to solve the problem of existing pressure pot security is poor there is provided a kind of water purification The pressure limiting device of standby pressure pot, when the water in pressure pot is filled it up with, the valve element of pressure limiting device closes water inlet, so as to limit in bucket Pressure continues to increase, and prevents that pressure pot from bursting.

In order to realize foregoing invention purpose, the utility model employs following technical scheme：

A kind of pressure limiting device of purifier pressure pot, including：

- valve seat, valve seat is fixed at the opening of staving, and being provided with the top of valve seat is used for the pipeline that water purification passes in and out cavity volume, valve seat Top is provided with external tapping, and external tapping connecting pipe, seat bottom portion is provided with inner joint, and inner joint is connected with cavity volume；

- valve element, is sheathed on valve base inner wall, and valve element includes plug and the plug for closing inner joint, the plug direction External tapping is provided with outer junction, and the plug is provided with interior junction towards inner joint, and the outer junction area is more than interior junction area；Valve Core is additionally provided with the dynamic clamping head and quiet clamping head for making inner joint be in normally open；

The fluid passage passed through for fluid is offered inside the valve seat, the fluid passage connects external tapping and inscribed Mouthful；Seal is equipped with the joint gap of the opening of the valve element, valve seat and staving.

The structure of valve pocket has many kinds, preferably, the pressure limiting device also includes valve pocket, the valve pocket is sheathed on valve seat Inside, valve pocket is in double-deck concentric tube-shaped；Valve pocket includes jacket and inner sleeve；

- the overcoat is mutually fixed with valve base inner wall；

- the fluid passage is located between overcoat and inner sleeve；

It is telescopic moving chamber inside the-inner sleeve, plug is respectively positioned in telescopic moving chamber with return unit, inner sleeve two ends and core Provided with the seal for preventing that fluid from passing through in the joint gap of rod.

Preferably, having the first spacing ring of limitation valve element abjection telescopic moving chamber in the middle part of the plug and for installing Second spacing ring of return unit, valve pocket has the 3rd spacing ring, and the return unit is the spring being set in outside valve element, the reset Part one end is resisted against on the second spacing ring, and the other end is resisted against on the 3rd spacing ring.

In order to improve the sealing of plug, preferably, the plug is made up of elastomeric material；The plug, which has, to be used for The sealing cone of inner joint is sealed, sealing is more good when there is the conical surface angle of inclination to coordinate with inner joint.

Preferably, valve seat is split type, including the first valve seat and the second valve seat being detachably connected, the first valve seat and the Two valve seats can be socketed, preferably using threaded connection.Split type valve seat is more convenient for assembling.

In order to improve the sealing of pressure limiting device, preferably, setting first is close between the periphery of the second valve seat and staving Sealing, first seal is used for the radial clearance between inwall at seal valve seat outer wall and staving opening；Valve base inner wall and valve pocket Second seal, the radial clearance that second seal is used between seal valve seat inwall and valve pocket outer wall are set between outer wall；Valve Cover and the 3rd seal is set between inwall and valve element outer wall, the 3rd seal is used to seal between valve sleeving inner wall and valve element outer wall Radial clearance.

In order to realize foregoing invention purpose, the utility model employs another technical scheme：A kind of purifier pressure The pressure limiting device of bucket, including valve seat and valve element；

- valve seat is fixed at the opening of staving, and being provided with the top of valve seat is used for the pipeline that water purification passes in and out cavity volume, is set at the top of valve seat There is external tapping, external tapping connecting pipe, seat bottom portion is provided with inner joint, and inner joint is connected with cavity volume；

- the valve core housing is located at valve base inner wall, and the valve core inside offers the fluid passage passed through for fluid, the stream Body passage connects external tapping and inner joint, and the valve element is provided with outer junction towards external tapping, and the valve element is provided with towards inner joint Interior junction；Valve element is additionally provided with the dynamic clamping head and quiet clamping head for making fluid passage be in normal open state；

Sealing unit is additionally provided with valve seat where inner joint, the sealing unit includes the passage gaps passed through for fluid The closed bottom of valve element base fluid channel is closed when being moved down with valve element,

The outer junction area is more than interior junction area, when the hydraulic pressure pressure that outer junction bears external tapping is held more than interior junction By the elastic force sum of inner joint hydraulic pressure pressure and return unit, so that valve element moves down the fluid of closed bottom closing valve element bottom Passage；It is tightly connected, is tightly connected between valve seat and staving between the valve element and valve seat.

Compared with prior art, a kind of pressure limiting device of purifier pressure pot of above-mentioned technical proposal is employed, is had Following beneficial effect：

First, the utility model is applied to pressure pot, when the water in pressure pot is filled it up with, the pressure in external water pipe increases Plus, when the pressure that external water pipe is applied to valve element is more than pressure and spring force sum that ladle body cavity volume applies, valve element is towards inner joint Direction is moved, and closes inner joint, is continued to increase so as to limit pressure in bucket, is prevented that pressure pot from bursting.

2nd, because the internal pressure of pressure pot is reduced by pressure limiting, therefore wall thickness demand, pressure is ensured without being further added by blocked up wall thickness The ability to bear of power, effectively reduces materials'use amount and the weight of pressure pot.

3rd, the pipeline at the top of pressure limiting device, while water purification enters and gone out in pressure charge bucket, water purification enters at pipeline Enter in staving, single pressure limiting device is to realize water inlet and realize water outlet, and outflow is for using out of staving at pipeline, compared to general The required opening only one of which on pressure pot in the turnover mode of many logical pipelines, the utility model, the pipeline opened up Few, required sealing is also few, while the ventilating water pipe of docking is also with respect to only one of which, low cost installs cost additional also low.

Brief description of the drawings

Fig. 1 is a kind of structural representation of the embodiment 1 of the pressure limiting device of purifier pressure pot of the utility model；

Fig. 2 is a kind of sectional view of the embodiment 1 of the pressure limiting device of purifier pressure pot of the utility model；

Fig. 3 is partial enlarged drawing at B in Fig. 1；

Fig. 4 is the schematic diagram that the present embodiment 1 is applied to pressure pot；

Fig. 5 is the schematic diagram that the present embodiment 1 is applied to pressure pot；

Fig. 6 is the sectional view of the pressure limiting device of embodiment 3；

Fig. 7 is the sectional view of the pressure limiting device of embodiment 4；

Fig. 8 is embodiment 4 and the connection diagram of pressure pot；

Fig. 9 is the sectional view of the pressure limiting device of embodiment 5；

Figure 10 is embodiment 5 and the connection diagram of pressure pot.

Reference：1st, staving；10th, pipeline；101st, fixed column；102nd, gusset；2nd, valve seat；21st, the first installation cavity；22、 First valve seat；221st, fixed plate；23rd, the second valve seat；3rd, connecting portion；31st, the 3rd installation cavity；4th, valve pocket；41st, telescopic moving chamber； 42nd, fluid passage；421st, the first spacing ring；5th, valve element；51st, plug；511st, the second spacing ring；512nd, the 3rd spacing ring；513、 Outer junction；514th, interior junction；52nd, plug；521st, sealing cone；53rd, closed bottom；54th, passage gaps；6th, protection cap；7th, One seal；8th, second seal；9th, the 3rd seal；10th, pipeline；11st, external tapping；12nd, inner joint；13rd, snap joint； 14th, rapid pipe connecting.

Embodiment

The utility model is described further below in conjunction with the accompanying drawings.

Embodiment 1：

A kind of pressure limiting device of pressure pot and purifier pressure pot as shown in Fig. 1 to 5, the pressure pot is used for water purification cartridge In putting.Pressure pot includes staving 1, and staving 1 is usually two integrally formed half barrel and formed by heat-melting butt-joint.Inside staving 1 With cavity volume, the cavity volume of the bottom of staving 1 is provided with air bag, and the top of staving 1 opens up the opening for entering cavity volume for the pure water after filtering, institute Stating pressure pot also includes limiting the pressure limiting device that pure water enters the purifier pressure pot of cavity volume when external pressure is excessive, pressure limiting device It is embedded in pressure pot.

The pressure limiting device includes：Valve seat 2, valve pocket 4 and valve element 5.

Valve seat 2, as shown in Figures 2 and 3, valve seat 2 are fixed at the opening of staving, and the top of valve seat 2 is provided with to enter for water purification Go out and external tapping 11 be provided with the top of the pipeline 10 of cavity volume, valve seat, the connecting pipe 10 of external tapping 11, the bottom of valve seat 2 is provided with inner joint 12, Inner joint 12 is connected with cavity volume；For the ease of processing and assembling, valve seat 2 is split type, including the first valve seat being fixed together 22 and second valve seat 23, the first valve seat 22 is located at the top of the second valve seat 23, and the top of the first valve seat 22 is provided with pipeline 10, pipeline 10 It is connected with extraneous pipeline, injects staving 1 for water purification or discharge the water purification in staving 1.As shown in Fig. 2 the valve of valve seat 2 first Seat 22 be provided with fixed plate 221.

The top of staving 1 is provided with connecting portion 3, and connecting portion 3 is in bucket-shaped, and the bottom of connecting portion 3 is provided with through hole, the conical surface of connecting portion 3 On be additionally provided with multiple vertical gussets 102 set upward, the gusset 102 is circumferentially evenly distributed along connecting portion, and gusset 102 is arranged The 3rd installation cavity 31 is formed, pressure limiting device is fixed in the 3rd installation cavity 31, and fixed column 101 is additionally provided with the conical surface of connecting portion 3, Fixed column and fixed plate 221 are connected by screw, pressure limiting device is fixed on connecting portion 3.

The second valve seat 23 is separated with the connecting portion 3 of staving 1 in the present embodiment, that is to say, that whole pressure limiting device can be with Remove, can directly be changed when pressure limiting device breaks down at the top of staving, reduce maintenance time and cost；Lead to during dismounting Cross the screw locking for releasing fixed plate 221 and fixed column 101, you can complete dismounting.

Fixed plate 221 is located on the first valve seat 22, is arranged on compared to fixed plate on the second valve seat, fixed plate is arranged on first When on valve seat, the first valve seat presses downwards, can increase the fixation to the second valve seat first, secondly by the first valve seat and the second valve Seat is compressed, and improves sealing.

Valve pocket 4 is set in the first installation cavity 21 of valve seat 2, and the telescopic moving chamber 41 of insertion is opened up in valve pocket 4 and is used In the fluid passage 42 of connection valve seat entrance and inner joint.The valve pocket 4 is in double-deck concentric tube-shaped；Valve pocket 4 includes overcoat and interior Set；The overcoat is mutually fixed with the inwall of valve seat 2；The fluid passage 42 is located between overcoat and inner sleeve；It is inside the inner sleeve Telescopic moving chamber 41.Telescopic moving chamber 41 is that, positioned at inner sleeve middle through-hole, through hole lower end sets the first spacing ring extended internally 421。

Valve element 5 is set in the telescopic moving chamber 41 of valve pocket 4, and the inner joint is opened or closed by the movement of valve element 5； Valve element 5 includes shaft-like plug 51 and is fixed on plug 52 of the plug close to inner joint one end, and the plug 52 is by elastic packing Material is made；The plug 52 has the sealing cone of sealing inner joint.Plug 51 is shaft-like for step type, from top to down successively The second spacing ring 511 and the 3rd spacing ring 512 extended radially outward is set.3rd spacing ring 512 takes off for limiting valve element 5 Go out valve pocket.

Pressure limiting device also includes the return unit for being used to drive valve core reset.The return unit is back-moving spring, the reset bullet Spring is set in outside valve element, and one end is resisted against on the first spacing ring of valve pocket, and the other end is resisted against on the second spacing ring of valve element.When Inside and outside pressure difference ends, spring force drives valve element to move up, and opens inner joint.

Pressure limiting device also includes when ambient pressure is excessive, and driving valve element 5 closes the pressure-driven mechanism of inner joint.

Pressure-driven mechanism is towards inscribed positioned at valve element towards the outer junction 513 of the one end of external tapping 11 and positioned at plug 52 The interior junction of 11 one end of mouth, the projected area of outer junction is S1, and the projected area of interior junction is that the pressure in S2, water pipe is P1, Pressure in pressure pot cavity volume is P2, when the pressure (P1*S1) that external tapping 11 is applied to valve element is more than the pressure that ladle body cavity volume applies Power (P2*S2) and spring force sum, the direction of valve element inner joint 12 movement, plug are pressed against on inner joint 12, prevent external tapping 11 Pure water enter back into cavity volume.

In order to pass through in preventing gap of the pure water between each part of pressure limiting device, the sealing of pressure limiting device is improved, the First seal 7 is set between the periphery of two valve seats 23 and staving, and first seal 7 is used for seal valve seat outer wall and staving opening Locate the radial clearance between inwall；Second seal 8 is set between the inwall of valve seat 2 and the outer wall of valve pocket 4, and second seal 8 is used for Radial clearance between the inwall of seal valve seat 2 and the outer wall of valve pocket 4；3rd seal is set between the inwall of valve pocket 4 and the outer wall of valve element 5 9, the 3rd seal 9 is used to seal the radial clearance between the inwall of valve pocket 4 and the outer wall of valve element 5.From economy and the angle for being easy to assembling Degree considers that first, second, and third seal is O-ring.

In addition, also setting up protection cap on ladle body, one end that pressure limiting device only connects extraneous pipeline is exposed outside protection cap, is used Damaged in protection pressure limiting device because being chronically exposed to outer.

It can be entered by the water purification of reverse osmosis membrane filtration by pipeline 10 in staving 1, can also be out of staving 1 by pipe Flow out in road 10.Pipeline 10 can be snap joint or the pipeline of purifier of common purifier, by quick The cooperation of joint and pipeline, realizes the quick connection of pressure limiting device.

Embodiment 2：

Compared with Example 1, the present embodiment and the difference of embodiment 1 be：Second valve seat 23 is integrally formed with staving 1, Second valve seat is together processed in staving process, and the processing technology uses Shooting Technique.

Together injection moulding had both reduced the quantity of part for second valve seat 23 and staving, saved manufacturing cost, also more just In assembling.During assembling, it is not necessary to as fixing limit by the way of threaded connection between the fixed plate and fixed column in embodiment 1 Pressure device, it is only necessary to which the first valve seat is fixed by screwing on the second valve seat, just completes the assembling of pressure limiting device.

Explosion-proof pressure bucket also includes opening up what is for pipeline 10 passed through in the protection cap 6 for being used to protect pressure limiting device, protection cap 6 Through hole, for protecting pressure limiting device to be damaged because being chronically exposed to outer.

Embodiment 3：

As shown in fig. 6, the present embodiment is similar to Example 1, distinctive points are：

Valve pocket 4 is single-layer tubular structure in the present embodiment, and the position of fluid passage 42 is different, in the present embodiment, fluid The position of passage 42, which is located on the middle part of valve element, the valve seat 2 where inner joint, is additionally provided with sealing unit, and the sealing unit includes The closed bottom 53 of valve element base fluid channel 42 is closed when the passage gaps 54 and valve element passed through for fluid are moved down.

It is in one inverted " U " to seal unit section, and closed bottom 53 is located at sealing plane of the unit towards valve element bottom On, passage gaps 54 are located at the side wall of sealing unit, when valve element pushes and is pressed against closed bottom 53, fluid passage 42 and circulation Gap 54 is not connected.

When external pressure is excessive, when the pressure that outer junction 513 is subject to is more than interior junction 514 and spring force, whole valve element is moved down, When valve element, which is displaced downwardly to valve element bottom opening, to be pressed against on closed bottom 53, closed bottom 53 closes fluid passage 42 so that Whole pressure limiting device is in the state of closing, and the water of external tapping cannot be introduced into inner joint, reaches that hydraulic pressure is further in prevention staving 1 The purpose of raising.

And when outer drops, when the pressure that outer junction 513 is subject to is less than interior junction 514 and spring force, valve element is moved up so that The opening of valve element bottom is separated with closed bottom 53, and fluid passage 42 is again turned on, and water purification can be logical by external tapping 11- fluids Road 42- passage gaps 54- inner joints 12 are reached inside staving.

Embodiment 4：

The present embodiment is close with embodiment 1, and difference is in be increased in the present embodiment at the inner joint 12 of pressure limiting device bottom If snap joint 13, the structure of the snap joint 13 is identical with commonly using quick coupling structure in common purifier, and one As the intake-outlet of pressure pot be again provided with the snap joint of this kind, by inscribed in pressure pot intake-outlet and pressure limiting device Connecting water pipe between the snap joint 13 of mouth, makes pressure limiting device be connected on pressure pot.

As shown in Figure 7 and Figure 8, the pressure limiting device relative pressure bucket in the present embodiment belongs to external mode, i.e. this implementation Pressure pot in example can be using common existing pressure pot, by the external pressure limiting device of pressure pot intake-outlet, reaching To the pressure limiting effect in embodiment 1.

Pressure limiting device in the present embodiment can be used individually, and can be applied on a variety of different pressure pots, Do not limited by pressure pot, operation strategies are wider.

Embodiment 5：

As shown in Figure 9 and Figure 10, the present embodiment is close with embodiment 4, and for convenience of the installation of pressure limiting device, the present embodiment is Rapid pipe connecting 14 will be additionally arranged at the inner joint 12 of pressure limiting device bottom, the diameter of the rapid pipe connecting 14 and conventional water purification Water pipe size in equipment is identical, directly pressure limiting device can be inserted in the snap joint 13 of pressure pot 1, install convenient, and And can apply on a variety of different pressure pots, do not limited by pressure pot, operation strategies are wider.

The above is preferred embodiment of the present utility model, is not departed from for the person of ordinary skill of the art On the premise of the principle of the invention, some variations and modifications can also be made, these also should be regarded as protection scope of the present invention.

Claims (6)

1. a kind of pressure limiting device of purifier pressure pot, it is characterised in that：Including valve seat (2) and valve element (5)；

Being provided with the top of-valve seat (2) is used for the pipeline (10) that water purification passes in and out cavity volume, and external tapping (11) is provided with the top of valve seat (2), external Mouth (11) connecting pipe (10), valve seat (2) bottom is provided with inner joint (12), and inner joint (12) is connected with cavity volume, the valve seat (2) Inside offers the fluid passage (42) passed through for fluid, fluid passage (42) the connection external tapping (11) and inner joint (12)；

- the valve element (5) is sheathed on valve seat (2) inwall, and valve element (5) includes plug and for the stifled of closed fluid passages (42) Head, the plug is provided with outer junction towards external tapping (11), and the plug is provided with interior junction towards inner joint (12)；Valve element (5) It is additionally provided with the dynamic clamping head and quiet clamping head for making fluid passage (42) be in normal open state；

The outer junction area is more than interior junction area, in the hydraulic pressure pressure that outer junction bears external tapping is born more than interior junction The elastic force sum of interface hydraulic pressure pressure and return unit, so that valve element (5) moves down plug closed fluid passages (42)；

It is tightly connected, is tightly connected between valve seat (2) and staving (1) between the valve element (5) and valve seat (2).

2. the pressure limiting device of purifier pressure pot according to claim 1, it is characterised in that：Also include valve pocket (4), institute State valve pocket (4) and be sheathed on valve seat (2) inside, valve pocket (4) is in double-deck concentric tube-shaped；Valve pocket (4) includes jacket and inner sleeve；

- the overcoat is mutually fixed with valve seat (2) inwall；

- the fluid passage (42) is located between overcoat and inner sleeve；

It is telescopic moving chamber (41) inside-inner sleeve, plug (51) is respectively positioned in telescopic moving chamber (41) with return unit, inner sleeve Two ends in the joint gap of plug (51) with being provided with the seal for preventing that fluid from passing through.

3. the pressure limiting device of purifier pressure pot according to claim 2, it is characterised in that：In the middle part of the plug (51) Second with the first spacing ring (421) for limiting valve element (5) abjection telescopic moving chamber (41) and for installing return unit is spacing Ring (511), valve pocket (4) has the 3rd spacing ring (512), and the return unit is to be set in the spring of valve element (5) outside, the reset Part one end is resisted against on the second spacing ring (511), and the other end is resisted against on the 3rd spacing ring (512).

4. the pressure limiting device of purifier pressure pot according to claim 1, it is characterised in that：The plug (52) is by bullet Property material is made；The plug (52) has the sealing cone (521) for being used for sealing inner joint (12).

5. the pressure limiting device of purifier pressure pot according to claim 1, it is characterised in that：Valve seat (2) to be split type, Including the first valve seat (22) and the second valve seat (23) being detachably connected, first valve seat (22) and the second valve seat (23) pass through Threaded connection.

6. a kind of pressure limiting device of purifier pressure pot, it is characterised in that：Including valve seat (2) and valve element (5)；

Being provided with the top of-valve seat (2) is used for the pipeline (10) that water purification passes in and out cavity volume, and external tapping (11) is provided with the top of valve seat (2), external Mouth (11) connecting pipe (10), valve seat (2) bottom is provided with inner joint (12), and inner joint (12) is connected with cavity volume；

- the valve element (5) is sheathed on inside valve seat (2) inwall, the valve element (5) and offers the fluid passage passed through for fluid (42), fluid passage (42) the connection external tapping (11) and inner joint (12), the valve element is towards external tapping (11) provided with outer Junction, the valve element is provided with interior junction towards inner joint (12)；Valve element (5), which is additionally provided with, makes fluid passage (42) be in normal open state Dynamic clamping head and quiet clamping head；

Sealing unit is additionally provided with valve seat (2) where inner joint, the sealing unit includes the passage gaps passed through for fluid (54) closed bottom (53) of closing valve element base fluid channel (42) and when valve element is moved down,

The outer junction area is more than interior junction area, in the hydraulic pressure pressure that outer junction bears external tapping is born more than interior junction The elastic force sum of interface hydraulic pressure pressure and return unit, so that valve element (5) moves down closed bottom (53) closing valve element bottom Fluid passage (42)；

It is tightly connected, is tightly connected between valve seat (2) and staving (1) between the valve element (5) and valve seat (2).