JP2024015850A - Electromagnetic gas fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic gas fuel injection valve capable of avoiding a malfunction when coating a slide surface between the outer periphery of a valve element and the inner periphery of a valve housing while reducing side force to be generated on the slide surface to effectively suppress the wear of the slide surface.

SOLUTION: The gas fuel injection valve includes a valve element 7 slidably fitted to a slide guide surface Bi provided on the inner periphery of a valve housing 2, a valve part 6 fixed to one end face of the valve element 7, opposed to a nozzle member 5, to open/close a nozzle hole 5n, and a coil 10c arranged encircling the other end of the valve housing 2 and a fixing core 8 and fixed to the fixing core 8. During the magnetization of the coil 10c, the fixing core 8 magnetically attracts the valve element 7 to separate the valve part 6 from a valve seat 5s against a return spring 14. A cylindrical guide cylinder B which is fixed to the inner periphery of the valve housing 2 and whose inner peripheral face becomes the slide guide surface Bi is formed by injection molding of a non-magnetic synthetic resin material having self-lubrication.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an electromagnetic gas fuel injection valve, in particular, a cylindrical valve housing made of a magnetic material, a valve seat, and a nozzle hole passing through the center of the valve seat, and fixed to one end of the valve housing. A nozzle member, a valve body that is slidably fitted to a sliding guide surface provided on the inner circumference of the valve housing, and a valve body that is fixed to one end surface of the valve body that faces the nozzle member and cooperates with the valve seat. a rubber valve part that can open and close the nozzle hole, a fixed core connected to the valve housing and facing the other end surface of the valve body, and a fixed core arranged and fixed so as to surround the other end part of the valve housing and the fixed core. It includes a coil that is fixed to the core and a return spring that biases the valve body toward the valve seat and holds the valve body in a seated position relative to the valve seat when the coil is de-energized.When the coil is energized, the fixed core is attached to the valve body. This invention relates to a gas fuel injection valve in which the valve portion is separated from the valve seat against a return spring by magnetically attracting the valve.

The above electromagnetic gas fuel injection valve is conventionally known as described in Patent Document 1.

Patent No. 5618751

By the way, in conventional electromagnetic gas fuel injection valves, in order to improve the operating durability of the valve body in a dry gas environment, anti-wear measures are taken using solid lubricants. The sliding guide surface on the inner periphery of the valve housing is coated with DLC (i.e., diamond-like carbon), fluororesin, etc., but this case has the following disadvantages.

In other words, the coating process described above requires a special step of rough polishing the surface to be coated before coating to ensure the surface roughness after coating, as the coating film has a very small thickness. There is a problem in that the manufacturing cost increases because the coating cycle time increases. Furthermore, because the coating film is extremely thin, the air gap between the outer periphery of the valve body and the inner periphery of the valve housing becomes small (for example, about 0.050 mm); , the side force (side pressure) generated on the sliding surface between the outer periphery of the valve body and the inner periphery of the valve housing increases, which becomes a factor that accelerates wear on the sliding surface.

The present invention has been proposed in view of the above, and an object of the present invention is to provide an electromagnetic gas fuel injection valve that has a simple structure and can solve the above problems of conventional devices.

In order to achieve the above object, the present invention includes a cylindrical valve housing made of a magnetic material, a valve seat, and a nozzle hole that penetrates the center of the valve seat, and is fixed to one end of the valve housing. a nozzle member, a valve body slidably fitted to a sliding guide surface provided on the inner circumference of the valve housing, and a valve body fixed to one end surface of the valve body facing the nozzle member; a rubber valve part that can open and close the nozzle hole in cooperation with the valve seat; a fixed core connected to the valve housing and facing the other end surface of the valve body; the other end part of the valve housing; a coil arranged to surround the fixed core and fixed to the fixed core; and a coil that urges the valve body toward the valve seat so that when the coil is not energized, the valve part is in a seated position relative to the valve seat. and a return spring for holding the coil, and when the coil is energized, the fixed core magnetically attracts the valve body to move the valve part away from the valve seat against the return spring. In the injection valve, a cylindrical guide cylinder made of a self-lubricating and non-magnetic synthetic resin material is fixed to the inner peripheral surface of the valve housing, and the inner peripheral surface of the guide cylinder is fixed to the inner peripheral surface of the valve housing. The first feature is that it forms a guide surface.

In addition to the first feature, the present invention has a second feature that the guide tube is molded from the synthetic resin material and inserted into the inner circumferential surface of the valve housing.

Further, in addition to the first or second feature, the present invention provides a coil assembly having the coil and a bobbin covering the coil and fixed to the fixed core, the coil assembly being fixed to the other end of the valve housing. and an end of the guide tube on the fixed core side is engaged with the coil assembly such that the guide tube is engaged and fixed, and the guide tube is prevented from separating from the valve housing. 3 characteristics.

In the present invention, the term "self-lubricating" refers to a material that can ensure the necessary lubricity on the sliding surface without replenishing lubricating oil because the friction coefficient of the material itself of the guide tube is extremely small. say.

According to the first feature of the present invention, the cylindrical guide tube that is fixed to the inner circumferential portion of the valve housing and whose inner circumferential surface serves as a sliding guide surface for the valve body has self-lubricating properties and is non-magnetic. Since it is formed by injection molding of a synthetic resin material, there is no need to coat the sliding surfaces between the valve body and the valve housing. Therefore, it is possible to avoid the need for a rough polishing process performed before coating, and the need for a long coating application cycle time, etc., which can greatly contribute to reducing manufacturing costs. Furthermore, the cylindrical guide tube is formed by injection molding of a non-magnetic synthetic resin material, and the thickness of the guide tube (non-magnetic part) allows air to flow through the sliding area between the outer periphery of the valve body and the inner periphery of the valve housing. Since a large gap can be secured, side force generated on the sliding surface can be reduced, and wear on the sliding surface can be effectively suppressed.

In addition, particularly according to the second feature, the guide tube is molded from the synthetic resin material and inserted into the inner circumferential surface of the valve housing, so that the cylindrical guide tube alone can be separated from the valve housing. It can be efficiently injection molded, and can be retrofitted to the valve housing by simply inserting the injection molded guide cylinder into the inner periphery of the valve housing. Therefore, it is highly suitable for mass production and reduces costs. This can contribute to savings.

Particularly, according to the third feature, the coil assembly fixed to the stationary core is engaged with and fixed to the other end of the valve housing, and the guide tube is arranged such that the guide tube is prevented from detaching from the valve housing. Since the end of the tube on the fixed core side engages with the coil assembly, the coil assembly can also be used as a means to prevent the guide tube fixed to the inner periphery of the valve housing from coming off, contributing to further cost savings. be able to.

Overall vertical sectional view showing an embodiment (closed state) of a gas fuel injection valve according to the present invention A vertical cross-sectional view of main parts showing an embodiment (open state) of the gas fuel injection valve. A graph showing an example of the relationship between the side force acting on the sliding part between the valve body and valve housing and the wall thickness of the bushing. A graph showing an example of the relationship between the axial thrust that acts on the valve body when the valve opens and the wall thickness of the bushing.

One embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

In FIG. 1, an electromagnetic gas fuel injection valve I according to the present invention has its front end installed in a mounting hole Ea provided in an intake pipe E of an engine that generates power by burning gas fuel. The valve opens during the intake stroke to inject gaseous fuel (eg, hydrogen gas, butane gas, methane gas, etc.) into the intake pipe E. In the embodiment, a gas fuel injection valve I is provided for each of the plurality of intake pipes E, and a fuel distribution pipe D is connected to a fuel introduction pipe 12 of each of the gas fuel injection valves I, which will be described later.

The valve body 1 of each gas fuel injection valve I includes a valve housing 2 formed of a magnetic material into a stepped cylindrical shape, a body base 3 connected to and fixed to the rear end of the valve housing 2, and a valve housing 2. and a nozzle member 5 that closes the front end opening of No. 2. In this specification, the side of the gas fuel injection valve I that faces into the intake pipe E in the direction along the longitudinal axis L (that is, the fuel injection side) is referred to as the front side, and the opposite side thereof is referred to as the rear side.

The nozzle member 5 is formed into a disk shape, and is airtightly fitted and fixed (for example, press-fitted, welded, etc.) to the inner circumferential surface of the small-diameter front portion 2f of the valve housing 2 near the front end with the seal ring 13 interposed therebetween. This nozzle member 5 has a rearward-facing valve seat 5s formed of a plane orthogonal to the longitudinal axis L, and a nozzle hole 5n that opens at the center of the valve seat 5s and penetrates the nozzle member 5 back and forth.

Further, a pair of front and rear synthetic resin ring members 31 and 32 defining an annular seal groove 30 between them are fitted (for example, press-fitted) onto the outer circumferential surface of the small-diameter front portion 2f of the valve housing 2. When the small-diameter front portion 2f of the valve housing 2 is fitted into the mounting hole Ea of the intake pipe E, the seal ring 33 installed in the seal groove 30 is in close contact with the inner circumferential surface of the mounting hole Ea, and is attached to the valve housing 2. Airtightly seal between the mounting hole Ea and the mounting hole Ea.

Further, within the valve housing 2, a plunger-shaped valve body 7 is accommodated on the rear side of the nozzle member 5, and is fitted so as to be slidable back and forth via a bush B inserted into the inner circumference of the valve housing 2. . A valve portion 6 that can open and close the nozzle hole 5n in cooperation with the valve seat 5s is joined and fixed (for example, by baking or bonding) to the front end surface of the valve body 7 facing the nozzle member 5. The valve portion 6 is made of a rubber material having heat resistance and pressure resistance.

Further, the bush B is entirely molded (more specifically, injection molded) from a self-lubricating and non-magnetic synthetic resin material (for example, polyamide-based synthetic resin, for example, 6-nylon). Note that among nylons, MC nylon (registered trademark), which has excellent sliding properties and high quality, is particularly desirable.

Further, the inner peripheral surface of the valve housing 2 of the embodiment is formed with an annular concave surface 2i that is recessed one step further in the radial direction than the fitting surface with the nozzle member 5, and the diameter of this annular concave surface 2i is The directional depth approximately corresponds to the wall thickness of the bush B. Thus, the bush B is fitted into the annular concave surface 2i (light press fit in the embodiment) until it hits the step at the front end of the concave surface 2i. Continuous almost flush with the surface.

The bush B is an example of the cylindrical guide tube of the present invention, and the inner peripheral surface of the bush B is a sliding guide surface Bi that slidably fits and supports the outer periphery of the valve body 7. It consists of

The valve body 7 is formed into a bottomed cylindrical shape with a closed front end, and inside the valve body 7 is a vertical hole 7a passing vertically through the center of the valve body 7, and from the front end of the vertical hole 7a. It has a plurality of horizontal holes 7b extending in the radial direction and opening in the outer peripheral surface of the small diameter front end portion 70 of the valve body 7. The rear end opening of the vertical hole 7a is close to and opposite to the downstream end of a fuel supply passage 8a that runs vertically through the center of the fixed core 8, which will be described later.

By the way, on the outer circumferential surface of the valve body 7 on the rear side of the small diameter front end 70, there is a first large diameter part 71 on the front side having a relatively narrow axial width, and an annular groove part 73 at the rear end of the first large diameter part 71. A second large-diameter portion 72 on the rear side that is adjacent to the rear side and has a wide axial width is provided, and the outer circumferential surfaces of the first and second large-diameter portions 71 and 72 are adjacent to each other via the inner circumferential surface of the bush B (i.e., the It slides into sliding contact with the sliding guide surface Bi).

Next, a specific example of the body base 3 described above will be explained. The body base 3 includes a cylindrical fixed core 8 whose front end faces are arranged opposite to the rear end of the valve body 7 with an operating gap s (corresponding to the opening/closing stroke of the valve body 7) in between, and an outer peripheral part of the fixed core 8. and a coil assembly 10 surrounding the outer periphery of the rear end of the valve body 7, and a bottomed cylinder integrally connected to the outer periphery of the fixed core 8 so as to cover the outer periphery and rear end of the coil assembly 10. It includes a shaped coil cover cylinder 9 and a fuel introduction cylinder 12 that is integrally connected to the rear end of the fixed core 8 and extends coaxially rearward, and the entire body base 3 except the coil assembly 10 is Composed of magnetic material.

The coil assembly 10 has a cylindrical shape as a whole and includes a coil 10c and a bobbin 10b made of an insulating synthetic resin around which the coil 10c is wound and covered. The front end surface of the coil assembly 10 (more specifically, the bobbin 10b) is in contact with the rear end surface of the rear end flange portion 2r of the valve housing 2 with the seal ring 15 interposed therebetween, and the state of contact is such that the coil cover The front end of the cylinder 9 is firmly held by integrally joining the outer periphery of the rear end flange 2r of the valve housing 2 (for example, by caulking 9k).

Moreover, a portion of the front end surface of the coil assembly 10 (more specifically, the bobbin 10b) near the inner peripheral end is engaged with the rear end of the bush B, and due to this engagement, the inner periphery of the valve housing 2 of the bush B is Separation from the department is prevented.

Furthermore, a resin mold layer 20 that continuously covers the rear end portion of the coil cover tube 9 and the front outer periphery of the fuel introduction tube 12 is integrally connected to the rear portion of the body base portion 3 of the valve body 1 . A coupler portion 22 that holds a current-carrying terminal 21 connected to the coil 10s is integrally molded into this resin mold layer 20 so as to protrude to one side of the resin mold layer 20. Inside the coupler section 22, the energizing terminal 21 is connected to an electronic control device via external wiring (not shown), and the electronic control device controls the energization of the coil 10c according to the operating state of the engine, thereby controlling the energization of the coil 10c. The opening and closing of the body 7 is controlled.

By the way, a hollow cylindrical retainer 16 is fixed (for example, press-fitted) to the inner circumferential surface of the hollow part of the fixed core 8, that is, the circumferential surface of the fuel supply path 8a. A return spring 14 is contracted to bias the valve 7 forward, that is, toward the valve seat 5s. The biasing force of the return spring 14 holds the valve portion 6 in the seated position relative to the valve seat 5s when the coil 10s is in a non-energized state (see FIG. 1), thereby holding the valve portion 6 in the seated position relative to the valve seat 5s. I is kept closed.

On the other hand, when the coil 10s is in an excited state (see FIG. 2) by being energized, the fixed core 8 magnetically attracts the valve body 7, which functions as a movable core, to return the valve part 6 to the biasing force of the spring 14. resist and separate it from the valve seat 5s. As a result, the gas fuel injection valve I is brought into an open state.

Further, the hollow portion 12i of the fuel introduction tube 12 is in communication with the fuel supply path 8a (therefore, inside the retainer 16) that runs vertically through the fixed core 8, and the rear end opening of the fuel introduction tube 12, that is, the inlet is connected to the fuel supply path 8a (therefore, inside the retainer 16). Filter 17 is attached. Furthermore, an annular seal groove 12g is recessed in the outer periphery of the rear end of the fuel introduction tube 12, and the rear seal ring 18 attached to the seal groove 12g is inserted into the outer periphery of the fuel introduction tube 12 when the fuel distribution pipe D is fitted. The fuel introduction cylinder 12 and the fuel distribution pipe D are airtightly sealed in close contact with the inner circumferential surface of the fuel distribution pipe D.

Although not shown, the upstream side of the fuel distribution pipe D is connected to the gas fuel tank via a pressure reducing device (for example, a pressure reducing valve, etc.), and the high pressure gas fuel whose pressure is regulated by the pressure reducing device is transferred to the fuel distribution pipe D. The gas is distributed and supplied to a plurality of gas fuel injection valves I from there.

Next, the operation of the above embodiment will be explained. In the non-energized state of the coil 10c shown in FIG. 1, the valve body 7 is urged forward by the return spring 14 to seat the valve portion 6 on the valve seat 5s, thereby bringing the gas fuel injection valve I into the closed state. keep. In this state, the gas fuel sent from the gas fuel tank (not shown) to the fuel distribution pipe D flows into the fuel introduction pipe 12, and then passes through the hollow retainer 16, the fuel supply path 8a in the fixed core 8, and the valve body 7. The valve body 7 waits inside the valve housing 2 (specifically, the space in front of the nozzle member 5) through the vertical hole 7a and the horizontal hole 7b, but at this time, the valve body 7 is not affected by the biasing force of the return spring 14. The pressure of the gas fuel acts as a valve closing force to press and hold the valve portion 6 in the seated position with the valve seat 5s.

In this state, when the coil 10c is energized by electricity, the magnetic flux sequentially travels through the coil cover tube 9, the valve housing 2, the valve body 7, and the fixed core 8 around the coil 10c, causing the valve body 7 to return to its original position. 14 and the pressure of the standby gas fuel, it is magnetically attracted to the fixed core 8, that is, a thrust force in the valve opening direction, which will be described later, acts on the valve body 7.

In this way, the gas fuel injection valve I opens when the valve part 6 integrated with the valve body 7 separates from the valve seat 5c, and accordingly, the gas fuel that has been waiting in the valve housing 2 is released from the nozzle hole 5n. It is injected into the intake pipe E.

In the embodiment described above, the bush B as a guide cylinder which is fixed to the inner circumferential part of the valve housing 2 and whose inner circumferential surface becomes the sliding guide surface Bi for the valve body 7 is made of a self-lubricating synthetic resin material ( It is formed by injection molding of nylon. This eliminates the need to coat the sliding surfaces between the valve body 7 and the valve housing 2 with a solid lubricant (DLC, fluororesin, etc.) as in the prior art. This makes it possible to avoid the need for a rough polishing step before coating to ensure subsequent surface roughness, and the need for a long coating application cycle time, making it possible to significantly reduce manufacturing costs.

Moreover, the bush B is formed by injection molding of the above-mentioned non-magnetic synthetic resin material, and the thickness of the bush B (non-magnetic part) is the sliding area between the outer periphery of the valve body 7 and the inner periphery of the valve housing 2. Since a large air gap can be secured, the side force generated on the sliding surface can be reduced, and wear on the sliding surface can be effectively suppressed. To explain more specifically, the amount of wear on the sliding surface of the bush B (i.e., the sliding guide surface Bi) is determined by the number of opening and closing operations of the valve body 7, the surface pressure on the sliding surface, and the sliding speed of the valve body 7. It is considered that the surface pressure on the sliding surface is proportional to the product of the side force, and in particular, there is a correlation that the surface pressure on the sliding surface depends on the side force. From this, it is clear that the amount of wear increases as the side force increases.

By the way, the graph in FIG. 3 is a graph showing an example of the relationship between the side force acting on the sliding part between the valve body 7 and the valve housing 2 and the wall thickness of the bush B as a guide cylinder, and FIG. 7 is a graph showing an example of the relationship between the axial thrust acting on the valve body 7 and the wall thickness of the bush B when the gas fuel injection valve I is opened.

As is clear from FIG. 3, the side force generated on the sliding surface between the outer periphery of the valve body 7 and the inner periphery of the valve housing 2 decreases as the wall thickness of the bush B increases. It can be seen that the side force of the example with a thickness of 0.5 mm is significantly reduced compared to the side force of the conventional example with a resin coating of about 0.050 mm. It is also clear from the correlation between the side force and the amount of wear that the amount of wear on the sliding surface can be reduced by reducing the side force.

On the other hand, as is clear from FIG. 4, as the air gap becomes larger, the thrust force (magnetic attraction force) in the valve opening direction of the valve body 7 tends to decrease. Even the thrust in the valve opening direction of the embodiment shown in FIG. is clear.

Therefore, in the present invention, the wall thickness of the bush B is set such that the side force on the sliding surface is sufficient compared to the conventional example within the range where the thrust in the valve opening direction can be sufficiently secured (that is, the thrust OK region in FIG. 4). It can be set appropriately within the wall thickness range to be reduced. That is, the set value is not limited to 0.5 mm as in the embodiment.

In particular, the bush B of the embodiment is molded (more specifically, injection molded) from the synthetic resin material and is inserted into the inner circumferential surface of the valve housing 2 afterward. The bush B can be efficiently injection molded independently from the valve housing 2, and can be retrofitted to the valve housing 2 by simply inserting the injection molded bush B into the inner periphery of the valve housing 2. Therefore, mass production is extremely easy and further cost savings are achieved.

Further, in the embodiment, the coil assembly 10 fixed to the fixed core 8 is engaged with and fixed to the other end of the valve housing 2, and the bush B is configured such that the bush B is prevented from separating from the valve housing 2. Since the rear end of the fixed core 8 side engages with the coil assembly 10, the coil assembly 10 can also be used as a means for preventing the bush B fixed to the inner peripheral part of the valve housing 2 from coming off, which reduces further costs. Savings are achieved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments can be implemented within the scope of the present invention.

For example, in the above embodiment, polyamide-based synthetic resin (nylon) is used as the material of the bush as the guide tube, but the material of the guide tube is not limited to the embodiment, and has at least self-lubricating properties. Any synthetic resin may be used as long as it has the same properties and is non-magnetic. For example, a highly crystalline polyacetal resin may be used.

Furthermore, in the above embodiment, the bush B as a guide cylinder is injection molded independently from the valve housing 2, and the injection molded bush B is inserted into the inner circumference of the valve housing 2 as a post-installation. According to the first feature of the present invention, the bush B may be integrally connected to the inner periphery of the valve housing 2 by insert-molding the bush B using the valve housing 2 manufactured in advance as an insert component.

Further, in the above embodiment, the electromagnetic gas fuel injection valve I is installed in the mounting hole Ea provided in the intake pipe E of an internal combustion engine that generates power by burning gas fuel, and the gas is injected into the intake pipe E. Although the electromagnetic gas fuel injection valve of the present invention is exemplified as an example that can inject fuel, the installation target of the electromagnetic gas fuel injection valve of the present invention is not limited to the embodiment. The gas fuel injection valve of the present invention may be installed in a fuel cell mounted on a fuel cell vehicle that drives a driving motor. In this case, the gas fuel injection valve is installed, for example, in a mounting hole that is provided in the fuel cell body and serves as a hydrogen gas inlet, and is used to control the supply of hydrogen gas from a hydrogen gas source (for example, a hydrogen gas tank) to the fuel cell. be done.

B...Bush Bi as a guide tube...Sliding guide surface I...Gas fuel injection valve 2...Valve housing 5...Nozzle member 5n... - Nozzle hole 5s... Valve seat 6... Valve part 7... Valve body 8... Fixed core 10... Coil assembly 10b... Bobbin 10c...・Coil 14...Return spring

Claims (3)

One end of the valve housing (2) has a cylindrical valve housing (2) made of a magnetic material, a valve seat (5s), and a nozzle hole (5n) passing through the center of the valve seat (5s). a nozzle member (5) fixed to the valve housing (2), a valve body (7) slidably fitted to a sliding guide surface (Bi) provided on the inner circumference of the valve housing (2); a rubber valve part (6) fixed to one end surface of the body (7) facing the nozzle member (5) and capable of opening and closing the nozzle hole (5n) in cooperation with the valve seat (5s); , a fixed core (8) connected to the valve housing (2) and facing the other end surface of the valve body (7), and surrounding the other end of the valve housing (2) and the fixed core (8). A coil (10c) is arranged and fixed to the fixed core (8), and the valve body (7) is biased toward the valve seat (5s) so that when the coil (10c) is not energized, the coil (10c) is fixed to the fixed core (8). and a return spring (14) that holds the valve portion (8) in a seated position relative to the valve seat (5s), and when the coil (10c) is energized, the fixed core (8) magnetizes the valve body (7). In an electromagnetic gas fuel injection valve, the valve portion (6) is moved away from the valve seat (5s) against the return spring (14) by suction,
The cylindrical guide tube (B), which is fixed to the inner circumferential portion of the valve housing (2) and whose inner circumferential surface becomes the sliding guide surface (Bi), is made of a self-lubricating and non-magnetic synthetic resin. An electromagnetic gas fuel injection valve characterized by being formed by injection molding of material. 2. The guide tube (B) according to claim 1, wherein the guide tube (B) is entirely molded from the synthetic resin material and is inserted into the inner circumferential surface of the valve housing (2). Electromagnetic gas fuel injection valve. A coil assembly (10) fixed to the stationary core (8), which has the coil (10c) and a bobbin (10b) around which the coil (10c) is wound, is attached to the valve housing (2) as well as the coil assembly (10). It is engaged and fixed at the end,
An end of the guide tube (B) on the fixed core (8) side is engaged with the coil assembly (10) so that the guide tube (B) is prevented from coming off the valve housing (2). 3. The electromagnetic gas fuel injection valve according to claim 1 or 2, wherein the electromagnetic gas fuel injection valve is matched with the above.

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