CN202878917U - Ink box - Google Patents

Abstract

The utility model relates to an ink box of an ink spraying printer. The ink box comprises a main shell, an ink cavity which is arranged inside the main shell and is used for accommodating ink, an ink outlet for supplying ink in the ink cavity to the printer, an air guide opening and an air guide channel which are positioned in the main shell and are communicated with external atmospheres and the ink cavity, and an air control valve and a water control valve which can be selectively communicated with the external atmosphere and the ink cavity, wherein the water control valve is a unidirectional conduction valve; the air control valve is a bidirectional conduction valve; and an opening threshold value of the air control valve is smaller than that of the water control valve. With the ink box, air feeding and exhaust functions are realized by the same air control valve on the basis of solving the problem of ink leakage caused by change of the environment; parts are reduced; the complexity of assembling is simplified; and the technical problems of a relatively large number of valve body parts and complicated assembling technology of the ink box in the prior art are solved.

Description

A kind of print cartridge

Technical field

The utility model relates to a kind of print cartridge.

Background technology

Usually, the mode of the interior negative pressure of control liquid container has multiple, common are and adopts porous material, is provided with the constant voltage chamber of capillary channel and control negative pressure by valve body.For the mode that adopts negative pressure in the valve body control print cartridge in the inkjet printing field, the valve body that control gas entered and controlled ink usually is set, and control valve has the side connection ambient atmosphere of hermetic unit usually, and opposite side is communicated with inking chamber, under airtight power effect, this valve body is closed at valve.Along with the consumption of ink, negative pressure increases in the print cartridge, and external atmosphere pressure is exerted pressure to above-mentioned control valve, and valve is opened, and outside air enters into print cartridge inside, regulates negative pressure.But Ink Cartridge inner pressure is easy to be subject to the impact that external environment changes, such as vibration, the variation of air pressure or the variation of temperature etc.If this moment, print cartridge was in off working state, the factors such as suddenly rising of ambient temperature cause the print cartridge internal gas to expand, but the active force that the gas that expands applies above-mentioned control valve body is identical from airtight force direction with valve body, cause the sealing of control valve body tighter, therefore gas can not be discharged by control valve, cause the print cartridge internal negative pressure to increase, and then cause that ink oozes out from ink outlet port, the problem that pollutes.

In order to address the above problem, increased an air bleeding valve on the basis of intake valve in the prior art, as shown in Figure 9, print cartridge 100 comprises inking chamber 101, ink outlet port 102, intake valve 104 and air bleeding valve 103.Intake valve 104 be communicated with atmosphere with valve from the identical side of airtight power, opposite side is connected with ink outlet port 102 by inking chamber 101; Air bleeding valve 103 be communicated with atmosphere with valve from the opposite side of airtight power, opposite side is communicated with ink outlet port 102 by inking chamber 101.When normal the printing, the suction force that produces for tattooing needle suction ink is applied on two valve bodies by inking chamber 101, and intake valve 104 is opened, air bleeding valve 103 sealings; When extraneous environmental change, the pressure in the print cartridge cavity increases, and intake valve 104 cuts out, and air bleeding valve 103 is opened, and unnecessary gas is discharged.But on a print cartridge intake valve and air bleeding valve are set simultaneously, parts are more, the assembling more complicated, and make mistakes easily.Therefore, wish a kind of print cartridge simple in structure of design, can control simultaneously the gas inlet and outlet by a control valve, reduce loaded down with trivial details parts, simplify assembling process.

The utility model content

The utility model relates to a kind of cartridge of ink-jet printer, and is more with the valve part that solves print cartridge in the prior art, assembles loaded down with trivial details technical problem.

In order to address the above problem, the technical solution adopted in the utility model is:

A kind of ink-jet printer cartridge, comprise: main casing, be arranged at being used in the main casing hold the inking chamber of ink, with the ink outlet port of the ink feed in the described inking chamber to printer, be positioned at the air guide port and the air guide channel that are used for being communicated with ambient atmosphere and inking chamber on the main casing, control valve and the water control valve that can selectively be communicated with ambient atmosphere and described inking chamber, it is characterized in that, described water control valve is the one-way conduction valve, described control valve is the two-way admittance valve, described control valve open threshold value less than the threshold value of opening of described water control valve.

Described print cartridge also comprises suction channel, and an end of described suction channel is communicated with ink outlet port, and the other end is branched off into two subchannels that extend to respectively control valve and water control valve.

Described control valve comprises airtight control gas boss.

Described control valve also comprises control valve seat, control valve film and control valve lid, and described airtight control gas boss is arranged on the described control valve film.

Described water control valve comprises controlling valve seat, water control valve film and water control valve lid, is provided with the control water boss with through hole on the described water control valve film.

The adjacent setting of described control valve and water control valve, described control valve seat and described controlling valve seat are set to the valve film that the valve seat of one, described control valve film and described water control valve film are set to one, and described control valve lid and described water control valve lid are set to the valve gap of one.

Also be provided with sealing flange between described valve seat and the valve gap.

Be provided with the through hole that is communicated with described air guide channel and the through hole that is communicated with described inking chamber in the described control valve seat.

Be provided with a through hole that is communicated with described inking chamber in the described controlling valve seat.

Described suction channel is arranged on described valve gap is connected the side with the valve film opposite side, and described suction channel one end is communicated with described ink supply chamber by through hole, and the other end is branched off into two subchannels that extend to respectively described control water boss and control gas boss.

Described water control valve and described control valve are the valve body of automatically opening or closing under the Negative Pressure Difference effect of valve body both sides.

After adopting technique scheme, because water control valve is the one-way conduction valve, control valve is the two-way admittance valve, control valve open threshold value less than the threshold value of opening of described water control valve, therefore, when the negative pressure in the print cartridge cavity increases, control valve is preferentially opened, and gas make-up is in the print cartridge cavity; Negative pressure reduces within environmental change causes the print cartridge cavity, and when malleation increased, control valve was preferentially opened, and gas is discharged, and avoids the interior suction function that increases of print cartridge cavity to cause the problem of ink outlet port ink bleed in ink.Like this, on the basis that has solved the ink leak problem that environmental change causes, realized the function of air inlet and exhaust by a control valve, parts have been reduced, simplified the complexity of assembling, it is more to have solved in the prior art valve part of print cartridge, assembles loaded down with trivial details technical problem.

Description of drawings

Fig. 1 is the decomposing schematic representation of the first embodiment print cartridge in the utility model.

Fig. 2 is the decomposing schematic representation of the first embodiment valve system in the utility model.

Fig. 3 is the valve pocket configuration diagram of the first embodiment print cartridge in the utility model.

Fig. 4 is the cavity body structure of the first embodiment print cartridge in the utility model.

Fig. 5 is the amplification assumption diagram of the first embodiment valve film and valve gap in the utility model.

Fig. 6 a is the cutaway view of the first embodiment print cartridge in the utility model.

Fig. 6 b is the flow circuit diagram of the first embodiment print cartridge ink and gas when normally printing.

Fig. 6 c is the flow circuit diagram of gas under the first embodiment print cartridge exhaust condition.

Fig. 7 is the schematic diagram of the first embodiment variation.

Fig. 8 a is the structural representation of the second embodiment valve body in the utility model.

Fig. 8 b be among the second embodiment under print state the structural representation of valve body.

Fig. 9 is print cartridge structural representation in the prior art.

The specific embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the embodiment that the utility model is related to is carried out clear, intactly describes.

Embodiment one

As shown in Figure 1, be the decomposing schematic representation of print cartridge 1, print cartridge 1 is comprised of main body 2 and adapter 3 as we know from the figure, and main body 2 comprises main casing 21, inking chamber 22, ink feed chamber 23, ink outlet port 24 and valve system 25.Wherein, valve system 25 is by valve pocket 26, valve film 27, and valve gap 28 and diaphragm seal B erection welding form; Inking chamber 22 is welded by main casing 21 and diaphragm seal A; Be filled with sealing ring 29 in the ink outlet port 24.

Lower mask body is introduced the structure of valve system 25.

Shown in Fig. 2-4, valve pocket 26 is formed on the main casing 21 of print cartridge, and formed the flange 263 that controlling valve seat 261 and 262, two valve seats of control valve seat are provided with protrusion at the recess of cavity diapire, be provided with a through hole 215 that is communicated with inking chamber 22 in the controlling valve seat 261.Be provided with the through hole 212 that is communicated with air guide channel 211 and the through hole 213 that is communicated with inking chamber 22 and ink channel 214 in the control valve seat 262.

Such as Fig. 2 and shown in Figure 5, be the decomposing schematic representation of valve system 25 and the whole three-dimensional structure diagram of valve film 27, this valve film is made by material that can strain, such as silica gel etc.One side of valve film 27 arranges two cone bosses with sealing function, namely controls water boss 271 and control gas boss 272, is provided with flange 273 around each boss.The centre of control water boss 271 is provided with one with the through hole 275 of communicating valve film 27 both sides of chimb, and the centre of control gas boss 272 then arranges one with the blind hole 276 of chimb, namely controls gas boss 272 for airtight.In addition, as the hermetically-sealed construction of valve system 25, be not limited to this form of valve film, so long as material that can strain can, and the shape of valve film convex platform is not limited to taper, such as being set to the shapes such as cylindrical, as long as can play the effect of sealing.

The decomposing schematic representation of valve system 25 as shown in Figure 2, one side of valve gap 28 is provided with suction channel 283, one end of suction channel 283 is communicated to ink supply chamber 23 by through hole 216, the other end is branched off into two subchannels, extend to respectively two seal bosses of valve film 27, the opposite side of valve gap 28 is provided with sealing flange 287.Certainly, suction channel 283 is not limited on the valve gap, and also and be not limited to " passage " this concept, for example on the cartridge body that valve cover structure is not set, suction channel can be any airtight form that is communicated with ink outlet port 24 and valve film 27.

During assembling valve system 25, at first, a side that valve film 27 is had boss faces valve pocket 26, determine the orientation, then cover valve gap 28, a side that makes valve gap be provided with suction channel 283 is installed back to valve film 27, and is last, diaphragm seal B is soldered on the print cartridge main casing 21, valve system 25 and through hole 216 sealings are got final product.

Be depicted as the cutaway view that intact print cartridge is installed such as Fig. 6 a, as can be seen from the figure, valve film 27 is on the XOY plane, the end (being the chimb of through hole 275 and blind hole 276) of the control water boss 271 of valve film and control gas boss 272 is connecting with the diapire of controlling valve seat 261 and control valve seat 262 respectively under airtight active force, the through hole 212 at control valve seat 262 centers is by control gas boss 262 sealings of valve film, and its direction from airtight power is the direction of extending along negative Z axis.Therefore, when the control gas boss 272 of valve film sealed through hole 212, plasmas channel 211 and ink channel 214 kept disconnected state.If positive Z-direction is defined as the first side of valve film 27, negative Z-direction is defined as the second side of valve film 27, then the suction channel 283 of print cartridge is positioned at the first side of valve film 27, and the plasmas channel 211 that is communicated with ambient atmosphere and the ink channel 214 that is communicated with inking chamber 22 are positioned at the second side of valve film 27.Because control gas boss 272 is airtight, therefore, plasmas channel 211 remains disconnected relation with suction channel 283 again.In addition, valve seat 26, valve film 27 and valve gap 28 are provided with sealing flange, therefore, the valve system 25 that forms according to above-mentioned assembly method has two independent valve bodies simultaneously, mask body introduction behind the water control valve 251(that is namely formed by controlling valve seat 261, control water boss 271 and valve gap 28), and by control valve seat 262, mask body introduction behind the control valve 252(that control gas boss 272 and valve gap 28 form).Because face contact between bonnet flange 287 and the valve seat flange 263, sealing is good, therefore, does not form connected relation between two valve bodies, and is separate.

Specifically introduce the action principle of two valve bodies below in conjunction with the duty of print cartridge.

Be depicted as the cutaway view of print cartridge such as Fig. 6 a, Fig. 6 b is the part enlarged drawing of Fig. 6 a, and Fig. 6 b represents that print cartridge is under the normal print state, and the tattooing needle that supplies of printer aspirates ink continuously by ink outlet port 24, ink in the ink supply chamber 23 is consumed gradually, and negative pressure increases.Because suction channel 283 is from the extension of ink supply chamber and be branched off into two passages, respectively by through hole 284,285 extend to two boss of valve film 27, and therefore the suction force for tattooing needle can be applied on two boss 271,272 of valve film 27 simultaneously by through hole 216, valve gap passage 283, through hole 285 and the through hole 284 of main casing.From foregoing description as can be known, the direction from airtight power of valve film 27 is the Z axis negative direction, and suction channel 283 is positioned at the first side of valve film 27, the direction that is to say the suction force that the valve film is subject to is the Z axis positive direction, therefore the trend of the oriented Direction distortion away from valve seat 26 of valve film 27, can be by the material of two boss be set, make the deformability of control water boss 271 be weaker than the deformability of controlling gas boss 272, during from airtight power, the butt between the chimb of control valve seat 262 and blind hole 276 preferentially is disengaged suction force on being applied to valve film boss 272 greater than it.Like this, preferentially opened by the control valve 252 that control valve seat 262, control gas boss 272 and valve gap 28 form, know that again ink channel 214 and air guide channel 211 are positioned at the same side of valve film 27, therefore when control valve 252 is opened, set up the fluid connection between the through hole 212 and 213.At this moment, ambient atmosphere enters into inking chamber 22 from air guide port 210, air guide channel 211, through hole 212 and 213 successively, shown in atmosphere stream M among Fig. 6 b.Meanwhile, consumption along with ink, negative pressure in the ink supply chamber 23 further increases, suction force on being applied to valve film boss 271 is greater than it during from airtight power, butt between the chimb of controlling valve seat 261 and through hole 275 also is disengaged, like this, by controlling valve seat 261, the water control valve 251 that control water boss 271 and valve gap 28 form is opened, ink in the inking chamber 22 arrives the space segment of controlling valve seat 261 through through hole 215, and then enter into passage 283 by the through hole 275 of valve film control water boss 271 and the through hole 284 on the valve gap 28, the ink that enters at last passage 283 enters into ink supply chamber 23 through the through hole 216 on the main casing 21, shown in Fig. 6 b ink inside stream N, guaranteed the regular supply of ink.

If the print cartridge that is installed on the printer is under the non-print state, the ink in the ink supply chamber 23 is not aspirated for tattooing needle, in the situation of extraneous ambient stable, the control water boss 271 of valve film 27 and control gas boss 272 under self airtight active force tightly against controlling valve seat 261 and control valve seat 262, at this moment, water control valve 251 and control valve 252 all are in the state of closing, ambient atmosphere can not enter in the print cartridge cavity by control valve 252, the print cartridge cavity keeps suitable negative pressure, therefore, ink is maintained in the print cartridge cavity and can ooze out from ink outlet port or air guide port.As seen, water control valve is automatically opened or is closed under the Negative Pressure Difference effect between ink outlet port and the inking chamber, and described control valve is automatically opened or closed under the Negative Pressure Difference effect between external environment and the inking chamber, does not rely on the active force of extraneous miscellaneous part.

But when external environment is for example vibrated, temperature or air pressure change and when causing in the print cartridge cavity gas expansion, can cause the malleation in inking chamber 22 and the ink supply chamber 23 to increase.Shown in Fig. 6 c, when above-mentioned malleation increases to certain degree, the gas that expands can apply top power shown in arrow D among the figure by passage 214 and 213 pairs of valve films 27 of through hole, make control water boss 271 and control gas boss 272 along the Direction distortion shown in the arrow D, because the deformability of control water boss 271 is weaker than the deformability of control gas boss 272, so that when top power that valve film 27 is subject to greater than it during from airtight power, control gas boss 272 preferentially is disengaged with the squash type butt of control valve seat 262, and namely control valve 252 is preferentially opened.Because the through hole 212 of the through hole 213 of connection ink channel 214 and connection air guide channel 211 is positioned at the same side of valve film 27, therefore when control valve 252 is opened, the gas that expands in the inking chamber can pass through passage 214, control valve 252 and air guide channel 211 and discharge from air guide port 210, shown in exhaust flow path P among the figure, until negative pressure is replied normally gradually in the print cartridge cavity, the top power that valve film 27 is subject to slowly reduces until be zero, control gas boss is recovering deformation under airtight active force, through hole 212 is sealed, and control valve 252 is closed.In addition, can be poor with the deformability of control gas boss 272 by control water boss 271 is set, make water control valve 251 in above-mentioned exhaust adjustment process, remain the state of closing, can not be applied on the ink thereby make external environment change the impact that brings, prevent that ink from oozing out drippage from ink outlet port.

From top description as can be known, the control gas boss 272 of valve film 27 is airtight, and the air guide channel 211 that is communicated with control valve 252 and ambient atmosphere and the ink channel 214 that is communicated with inking chamber and control valve 251 are positioned at a side that is provided with seal boss of valve film 27, therefore, when the external environment variation causes that the inking chamber internal pressure increases, opposite from airtight force direction to the active force of valve film 27 and valve film 27 of malleation in the inking chamber, therefore, when above-mentioned active force greater than it during from airtight power, control valve 252 can carry out the exhaust action automatically.In addition, also be provided with the suction channel 283 that is positioned at valve film 27 opposite sides on the print cartridge, suction channel 283 is branched off into two subchannels that extend to respectively control valve 252 and water control valve 251, so that when printing action, also control valve 252 is worked when being applied to water control valve 251 for the suction force of tattooing needle, therefore control valve 252 can be opened under the suction force effect, make ambient atmosphere from air guide port 210, all 214 add in the inking chamber through air guide channel 211, control valve 252 and ink are logical.

From the above description as can be known, water control valve 251 is the unilaterally connected valve, and control valve 252 is the diconnected valve, and namely ink can only be unidirectional passes through water control valve 251, and atmosphere can enter or discharge from control valve 252, for diconnected.

Consider from another angle, if control gas boss 272 is not airtight, when in the inking chamber during gas expansion, control valve 252 is opened, and ambient atmosphere can directly enter suction channel 283 by control gas boss 272, and then arrives the tattooing needle that supplies of printer, produce bubble, and ink can not be supplied normally.If when normally printing, there is not suction channel that suction force is applied on the control valve 252, then valve film 27 is not owing to can be opened from airtight power, and ambient atmosphere can not add to inking chamber, and it is not smooth ink feed to occur easily, prints the problems such as broken string.If ink channel 214 and air guide channel 211 are arranged on the both sides of valve film 27, then change when causing that negative pressure increases in the inking chamber when external environment, the gas of expansion just can not be discharged from air guide port, thereby causes ink outlet port to drip black problem.

Therefore, adopt the application's technical scheme, on the one hand, open the poor of threshold value by what control valve and water control valve be set, make when two valve bodies are subject to a certain size active force simultaneously, control valve is preferentially opened, and has guaranteed like this to print the regular supply of ink when carrying out, and has also realized alleviating the purpose that external environment changes by the control valve exhaust.On the other hand, by a control valve is set, realize air inlet and two functions of exhaust, the i.e. intake valve function of control air inlet and be used for to alleviate that external environment changes the impact that brings and air bleeding valve function that gas is discharged when print cartridge is normally printed, than controlling air inlet and controlling to give vent to anger and be arranged to two independent valve bodies, the application has realized the combination of two kinds of functions having greatly reduced the number of parts and the complexity of assembling with fairly simple structure.

In addition, can also do following distortion to embodiment of the present utility model, for example control valve 252 and water control valve can be arranged in 251 minutes, namely two valve bodies are independent of each other, as shown in phantom in Figure 7, only needing that suction channel 283 is extended to respectively two valve bodies gets final product.、

Embodiment two

Be depicted as the second embodiment schematic diagram of the technical program such as Fig. 8 a and 8b, Fig. 8 a is control valve structure and the structural representation relevant with control valve among the second embodiment, control valve 252 ' is that the material of elastically deformable is made in the present embodiment, different from embodiment one is to have formed dipping fracture 270 ' in the middle of the control valve 252 ', being obliquely installed so that the direction from airtight power of control valve 252 ' is the negative Z-direction among the figure of crack 270 ', namely when not having External Force Acting when control valve 252 ' is gone up, the state that the valve maintenance is closed.The suction channel 283 that is communicated with ink outlet port still is arranged on the positive Z-direction side of control valve 252 ', namely be positioned at valve from the opposite side of airtight force direction.The ink channel 214 that is communicated with inking chamber still is arranged on the negative Z-direction side of control valve 252 ', namely be positioned at valve from the identical side of airtight force direction.The air guide channel 211 that is communicated with ambient atmosphere keeps optionally connected state with ink channel 214, keeps disconnected state with suction channel 283.Be depicted as diagram under the print state such as Fig. 8 b, when printing is carried out, apply active force for the suction force of tattooing needle (among the figure shown in the arrow) by 283 pairs of control valves 252 ' of suction channel, this active force is opposite from airtight force direction with valve, when this active force greater than valve from airtight power the time, control valve 252 ' is out of shape to positive Z-direction, 270 ' locates to have formed a slit in the crack, ambient atmosphere adds in the inking chamber by slit 270 ', guarantees the regular supply of ink.When changing, external environment causes gas expansion in the inking chamber, when pressure increases, the malleation that inking chamber increases to control valve 252 ' apply with valve from the opposite top power of airtight force direction, when this top power greater than valve from airtight power the time, control valve 252 ' is out of shape to positive Z-direction, 270 ' locates to have formed a slit in the crack, and control valve 252 ' is opened.Same water control valve 251 is the unilaterally connected valve, and control valve 252 ' is the diconnected valve.Since water control valve 251 open threshold value greater than the threshold value of opening of control valve 252 ', therefore, can make water control valve 251 when environmental change, keep the state of closing, at this moment, discharge in the slit of the gas of expansion by control valve, has alleviated the interior pressure of inking chamber.

As seen, the control valve of embodiment two has the function of control gas inlet and outlet equally, and structure is also fairly simple, has reduced equally parts, has simplified assembling process.The water control valve of present embodiment is identical with embodiment one, satisfies when having active force to act on simultaneously water control valve and control valve, and control valve has precedence over water control valve and opens first.

Obviously, described embodiment is a part of the present utility model, rather than whole embodiment.To the embodiment in the utility model, under the prerequisite of not making creative work, other embodiment of acquisition belongs to protection domain of the present utility model to those of ordinary skills.

Claims (11)

1. ink-jet printer cartridge, comprise: main casing, be arranged at being used in the main casing hold the inking chamber of ink, with the ink outlet port of the ink feed in the described inking chamber to printer, be positioned at the air guide port and the air guide channel that are used for being communicated with ambient atmosphere and inking chamber on the main casing, control valve and the water control valve that can selectively be communicated with ambient atmosphere and described inking chamber, it is characterized in that, described water control valve is the one-way conduction valve, described control valve is the two-way admittance valve, described control valve open threshold value less than the threshold value of opening of described water control valve.

2. ink-jet printer cartridge as claimed in claim 1 is characterized in that, described print cartridge also comprises suction channel, and an end of described suction channel is communicated with ink outlet port, and the other end is branched off into two subchannels that extend to respectively control valve and water control valve.

3. ink-jet printer cartridge as claimed in claim 2 is characterized in that, described control valve comprises airtight control gas boss.

4. ink-jet printer cartridge as claimed in claim 3 is characterized in that, described control valve also comprises control valve seat, control valve film and control valve lid, and described airtight control gas boss is arranged on the described control valve film.

5. ink-jet printer cartridge as claimed in claim 4 is characterized in that, described water control valve comprises controlling valve seat, water control valve film and water control valve lid, is provided with the control water boss with through hole on the described water control valve film.

6. ink-jet printer cartridge as claimed in claim 5, it is characterized in that, the adjacent setting of described control valve and water control valve, described control valve seat and described controlling valve seat are set to the valve film that the valve seat of one, described control valve film and described water control valve film are set to one, and described control valve lid and described water control valve lid are set to the valve gap of one.

7. ink-jet printer cartridge as claimed in claim 6 is characterized in that, also is provided with sealing flange between described valve seat and the valve gap.

8. ink-jet printer cartridge as claimed in claim 7 is characterized in that, is provided with the through hole that is communicated with described air guide channel and the through hole that is communicated with described inking chamber in the described control valve seat.

9. ink-jet printer cartridge as claimed in claim 8 is characterized in that, is provided with a through hole that is communicated with described inking chamber in the described controlling valve seat.

10. ink-jet printer cartridge as claimed in claim 8, it is characterized in that, described suction channel is arranged on described valve gap is connected the side with the valve film opposite side, described suction channel one end is communicated with described ink supply chamber by through hole, and the other end is branched off into two subchannels that extend to respectively described control water boss and control gas boss.

11. print cartridge as claimed in claim 1 is characterized in that, described water control valve and described control valve are the valve body of automatically opening or closing under the Negative Pressure Difference effect of valve body both sides.

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